LongSung Technology U3500 MODULE User Manual USERS MANUAL

LongSung Technology (Shanghai)Co.,Ltd. MODULE USERS MANUAL

USERS MANUAL

U3500_Hardware_User_Guide _V2.0 Page 1 of 82 U3500_Hardware_User_Guide _V2.0
U3500_Hardware_User_Guide _V2.0 Page 2 of 82 IMPORTANT NOTICE COPYRIGHT NOTICE Copyright©2010, LongSung Technology (Shanghai) Co., Ltd. All rights reserved. TRADEMARKS LongSung Technology (Shanghai) Co., Ltd’s products are exclusively owned by LongSung Technology (Shanghai) Co., Ltd. References to other companies and their products use trademarks owned by the respective companies and are for reference purpose only. CONFIDENTIALITY The information contained here (including any attachments) is confidential. The recipient here acknowledges the confidentiality of this document, and except for the specific purpose, this document shall not be disclosed to any third party. WARRANTY DISCLAIMER LongSung Technology (Shanghai) Co., Ltd makes no representations or warranties, either express or implied, by or with respect to anything in this document, and shall not be liable for any implied warranties of merchantability or fitness for a particular purpose or for any indirect, special or consequential damages. NO GUARANTEE Our company will not take any responsibility for any damage caused by the customer’s abnormal operation. Please refer to specification and designing reference guide. Our company have right to modify the document according to technical requirement with no announcement to the customer. Federal Communication Commission Interference Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
U3500_Hardware_User_Guide _V2.0 Page 3 of 82 on, the user is encouraged to try to correct the interference by one of the following measures:  Reorient or relocate the receiving antenna.  Increase the separation between the equipment and receiver.  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  Consult the dealer or an experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. This device is intended only for OEM integrators under the following conditions:1)The antenna must be installed such that 20 cm is maintained between the antenna and users.2)The transmitter module may not be co-located with any other transmitter or antenna. As long as 2 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. End Product LabelingThis transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: “Contains FCC ID: XHZU3500”. The grantee's FCC ID can be used only when all FCC compliance requirements are met. Manual Information To the End UserThe OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.The end user manual shall include all required regulatory information/warning as show in this manual.
U3500_Hardware_User_Guide _V2.0 Page 4 of 82 Contents 1. Overview .................................................................................................................................. 9 1.1. Purpose of the document ....................................................................................... 9 1.2. Summary ...................................................................................................................... 9 1.3. Correlative documents ............................................................................................ 9 1.4. Document’s history ................................................................................................. 10 1.5. Abbreviations ............................................................................................................ 10 2. Introduction........................................................................................................................... 12 2.1. Key features .............................................................................................................. 14 2.2. Operating modes ..................................................................................................... 16 2.3. Hardware functional block diagram ................................................................. 17 2.4. Hardware interface ................................................................................................. 18 3. Application interfaces description ................................................................................. 20 3.1. 83-pin Stamp hole SMT PAD and 126-pin LGA PAD .................................. 20 3.2. Power supply ............................................................................................................. 27 3.2.1. Power Supply and reference design ..................................................... 27 3.2.1.1. VBAT input ......................................................................................... 27 3.2.1.2. VRTC input ......................................................................................... 28 3.2.1.3. VOUT、VREG_GP2、VREG_MMC voltage output ................. 29 3.2.1.4. POWER_ON input ............................................................................ 29 3.2.1.5. RESET input ....................................................................................... 30 3.2.2. Power on/off control ................................................................................... 31 3.2.2.1. POWER_ON control module power on ..................................... 31 3.2.2.2. VBAT active power on .................................................................... 32 3.2.2.3. AT command power off ................................................................. 33 3.2.2.4. VBAT set low or off to power off mode ................................... 33 3.2.3. RESET control ............................................................................................... 33 3.3. USB interface ............................................................................................................ 35 3.3.1. USB interface description ......................................................................... 35 3.3.2. USB reference circuit ................................................................................. 35 3.3.3. USB driver ...................................................................................................... 37 3.3.3.1. Linux OS load USB driver for U3500 ....................................... 37 3.3.3.2. Linux OS AP use AT to control U3500 ..................................... 39 3.3.3.2. Linux OS AP dial PPP connection ............................................... 41 3.4. UART interface .......................................................................................................... 44 3.4.1. UART interface description ...................................................................... 44 3.4.2. UART interface reference circuit ............................................................ 44 3.4.3. UART interface description ...................................................................... 45 3.4.4. U3500 sleep and awake control ............................................................ 46 3.4.4.1. The prerequisites for module to sleep .................................... 47 3.4.4.2. About sleep and awake questions ............................................ 47
U3500_Hardware_User_Guide _V2.0 Page 5 of 82 3.5. Analog audio interface .......................................................................................... 49 3.5.1. Audio interface description ...................................................................... 49 3.5.2. Audio I/O and earphone connection .................................................... 49 3.5.3. Audio I/O and phone handfree connection ....................................... 49 3.5.4. Audio I/O and phone handset connection ......................................... 50 3.5.5. Analog audio interface reference circuit ............................................. 50 3.6. PCM interface ............................................................................................................ 51 3.6.1. PCM interface description ......................................................................... 52 3.6.2. Auxiliary PCM ................................................................................................ 53 3.6.3. Primary PCM .................................................................................................. 54 3.6.4. Audio parameters control ......................................................................... 56 3.7. USIM/SIM interface ................................................................................................ 57 3.7.1. USIM/SIM interface description ............................................................. 57 3.7.2. USIM/SIM interface reference circuit .................................................. 58 3.8. NETLIGHT output .................................................................................................... 60 3.8.1. NETLIGHT signal description ................................................................... 61 3.8.2. NETLIGHT reference circuit ..................................................................... 61 3.9. ADC interface ............................................................................................................ 61 3.9.1. ADC interface description......................................................................... 62 3.9.2. ADC input reference circuit ..................................................................... 62 3.9.3. Temperature detector circuit .................................................................. 62 3.10. GPIO interface ....................................................................................................... 63 3.11. Antenna interface ................................................................................................. 63 3.11.1. Solder antenna .......................................................................................... 64 3.11.2. RF connector antenna ............................................................................. 65 3.11.2.1. RF cable ............................................................................................ 65 3.11.3. U3500 RF output power ......................................................................... 65 3.11.4. U3500 RF receiver sensitivity .............................................................. 66 3.11.5. U3500 operating frequencies ............................................................... 66 3.11.6. Antenna parameters requirement ...................................................... 66 3.12. Micro SD card interface ...................................................................................... 67 3.12.1. Micro SD card interface description ................................................... 67 3.12.2. Micro SD interface reference circuit .................................................. 67 3.13. Camera interface .................................................................................................. 68 3.13.1. Camera interface description ............................................................... 68 3.13.2. Camera interface reference circuit ..................................................... 69 3.14. Keypad interface ................................................................................................... 70 3.15. LCD interface .......................................................................................................... 70 3.16. 32K_CLK_BT interface ........................................................................................ 71 4. Mechanics ............................................................................................................................... 72 4.1. The view of U3500 .................................................................................................. 72 4.2. Module 3D stack ...................................................................................................... 72 4.3. Module 2D mechanical dimensions .................................................................. 73
U3500_Hardware_User_Guide _V2.0 Page 6 of 82 4.4. Application side decals of U3500 ...................................................................... 73 4.5. RF connector ............................................................................................................. 73 4.5.1. Module side RF connector ........................................................................ 74 4.5.2. Application side RF connector ................................................................ 74 5. Power consumption ............................................................................................................ 76 6. Electrical characteristics ................................................................................................... 78 6.1. Absolute maximum power ratings .................................................................... 78 6.2. Operating temperatures ....................................................................................... 78 6.3. Interface operating status ................................................................................... 80 6.4. Reliability .................................................................................................................... 80 6.5. Electrostatic discharge .......................................................................................... 82
U3500_Hardware_User_Guide _V2.0 Page 7 of 82 Tables Table1：Document’s update history .......................................................................... 10 Table2：Abbreviation and description ...................................................................... 10 Table3：Key features of U3500 ................................................................................... 14 Table4：Overview operating modes .......................................................................... 16 Table5：U3500 pin definition ....................................................................................... 21 Table6：U3500 Power supply correlative interfaces ........................................... 27 Table7：U3500 USB interface ...................................................................................... 35 Table8：U3500 UART interface .................................................................................... 44 Table9：U3500 sleep and awake interface ............................................................. 46 Table10：U3500 analog audio interface .................................................................. 49 Table11：The connection between earphone jack and audio I/O .................. 49 Table12：The connection between phone handle and audio I/O ................... 49 Table13：U3500 analog audio and handset connection .................................... 50 Table14：Auxiliary PCM and Primary PCM configuration ................................... 52 Table15：U3500 PCM interface ................................................................................... 52 Table16：AUX_CODEC timing parameters .............................................................. 53 Table17：PRIM_CODEC timing parameters ............................................................ 56 Table18：The AT commands for control audio parameters .............................. 57 Table19：U3500 USIM/SIM interface ........................................................................ 57 Table20：U3500 NETLIGHT signal description ...................................................... 61 Table21：U3500 net light description ....................................................................... 61 Table22：U3500 ADC interface description ............................................................ 62 Table23：U3500 GPIO interface description .......................................................... 63 Table24：U3500 antenna interface ............................................................................ 64 Table25：U3500 RF output power .............................................................................. 65 Table26：U3500 RF receiver sensitivity ................................................................... 66 Table27：U3500 operating frequencies ................................................................... 66 Table28：U3500 antenna parameters requirement ............................................ 66 Table29：U3500 Micro SD card interface ................................................................ 67 Table30：U3500 Camera interface ............................................................................ 68 Table31：U3500 max current consumption in some mode .............................. 76 Table32：Absolute maximum power ratings .......................................................... 78 Table33：U3500 module operating temperature ................................................. 78 Table34：Digital Signal DC Characteristics ............................................................. 80 Table35：U3500 power supply range ....................................................................... 80 Table36：Requirements on the environment reliability ..................................... 80 Table37：The ESD endure status measured table ............................................... 82
U3500_Hardware_User_Guide _V2.0 Page 8 of 82 Figures Figure1：U3500 Hardware functional block diagram ......................................... 17 Figure2：U3500 top view .............................................................................................. 18 Figure3：U3500 bottom view ...................................................................................... 18 Figure4：U3500 83-pin stamp hole SMT PAD and 126-pin LGA PAD pin location ......................................................................................................................... 20 Figure5：U3500 VBAT input ......................................................................................... 28 Figure6：VRTC connect to rechargeable battery.................................................. 28 Figure7：VRTC connect to non-rechargeable battery ........................................ 29 Figure8：VRTC connect to large capacitance capacity ....................................... 29 Figure9：POWER_ON control module power on ................................................... 30 Figure10：AP_RESET control module reset ............................................................ 31 Figure11：POWER_ON control module power on timing .................................. 32 Figure12：VBAT active power on mode timing ..................................................... 32 Figure13：AT command power off timing ............................................................... 33 Figure14：U3500 RESET timing .................................................................................. 34 Figure15：U3500 USB interface reference design circuit ................................. 36 Figure16：U3500 UART is used for data transfer ................................................ 45 Figure17：U3500 UART is used for AT command ................................................ 45 Figure18：Analog audio interface reference circuit ............................................ 50 Figure19：AUX_PCM_SYNC timing ............................................................................ 53 Figure20：AUX_PCM_CODEC to U3500 timing ..................................................... 53 Figure21：U3500 to AUX_PCM_CODEC timing ..................................................... 53 Figure22：PRIM_PCM_SYNC timing .......................................................................... 54 Figure23：PRIM_PCM_CODEC to U3500 timing ................................................... 54 Figure24：U3500 to PRIM_PCM_CODEC timing ................................................... 55 Figure25：C707 10M006 512 2 SIM Holder SPEC ............................................... 59 Figure26：U3500 USIM/SIM interface reference circuit .................................... 60 Figure27：U3500 NETLIGHT reference circuit ...................................................... 61 Figure28：U3500 ADC input reference circuit ....................................................... 62 Figure29：U3500 temperature detector circuit .................................................... 62 Figure30：U3500 solder antenna reference circuit ............................................. 64 Figure31：The reference design of RF connector and antenna ................... 65 Figure32：U3500 Micro SD card interface reference circuit ............................ 68 Figure33：U3500 Camera interface reference circuit......................................... 70 Figure34：The top and bottom view of U3500 ..................................................... 72 Figure35：U3500 2D mechanical dimensions ....................................................... 73 Figure36：The mechanical dimensions of MM9329-2700RA1 ......................... 74 Figure37：The mechanical dimensions of MXTK88TK2000 .............................. 75
U3500_Hardware_User_Guide _V2.0 Page 9 of 82 1. Overview U3500 is a wireless module which is designed for the global market. It is a consumptive product; it can be designed in many kinds of applications which can work on UMTS/EDGE/GPRS/GSM network. U3500 enables connect to Internet over UMTS at speed up to 384 Kbps or EDGE at speed up to 237Kbps or GPRS at speed up to 85.6Kbps. U3500 provides Audio, SMS, Phonebook functions as well as high speed access. It can be designed in many kinds of applications. Such as Data card, Video monitor, Tablet, Electric-book, MID, Vehicle equipment, etc. 1.1. Purpose of the document The document described the basic functions, supported services, the key features, main interfaces and reference design, the mechanics and the electronic characteristics of the module U3500. It will guide the user to design U3500 in their applications. 1.2. Summary The following lists the contents of this document.  Chapter 1: Described the overview, purpose, correlative documents, document’s history and abbreviations.  Chapter 2: Described the basic functions, key features and hardware interfaces of the module.  Chapter 3: Described in detail the module’s interfaces and reference design.  Chapter 4: Described the mechanical specifications of the module.  Chapter 5: Described in detail the power consumptions of the module.  Chapter 6: Described in detail electrical specifications of the module. 1.3. Correlative documents  U3500_SPEC  U3500_ATC  U3500_EVB_User_Guide  U3500_Reference_Circuit  U3500_Application_Guide
U3500_Hardware_User_Guide _V2.0 Page 10 of 82 1.4. Document’s history Table1：Document’s update history Version Name Date Update description V2.0 Huaming Zhang 2012-10-24 V2.0 version create 1.5. Abbreviations Table2：Abbreviation and description Abbreviations Description AMR Adaptive Multi-rate BER Bit Error Rate BTS Base Transceiver Station PCI Peripheral Component Interconnect CS Circuit Switched (CS) domain CSD Circuit Switched Data DCE Data communication equipment DTE Data terminal equipment DTR Data Terminal Ready EDGE Enhanced Data rates for GSM Evolution EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge FR Frame Relay GMSK Gaussian Minimum Shift Keying GPIO General Purpose Input Output GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HR Half Rate HSDPA High Speed Downlink Packet Access HSUPA High Speed Uplink Packet Access HSPA HSPA High-Speed Packet Access IEC International Electro-technical Commission
U3500_Hardware_User_Guide _V2.0 Page 11 of 82 IMEI International Mobile Equipment Identity I/O Input/Output ISO International Standards Organization ITU International Telecommunications Union bps bits per second LED Light Emitting Diode M2M Machine to machine MO Mobile Originated MT Mobile Terminated NTC Negative Temperature Coefficient PC Personal Computer PCB Printed Circuit Board PCS Personal Cellular System PCI Peripheral Component Interconnect PCM Pulse Code Modulation PCS Personal Communication System PDU Packet Data Unit PPP Point-to-point protocol PS Packet Switched QPSK Quadrate Phase Shift Keying SIM Subscriber Identity Module TCP/IP Transmission Control Protocol/ Internet Protocol UART Universal asynchronous receiver-transmitter USIM Universal Subscriber Identity Module UMTS Universal Mobile Telecommunications System USB Universal Serial Bus WCDMA Wideband Code Division Multiple Access
U3500_Hardware_User_Guide _V2.0 Page 12 of 82 2. Introduction U3500 is a wireless module which is designed for the global market. It is a consumptive product; it can be designed in many kinds of applications which can work on UMTS/EDGE/GPRS/GSM network. U3500 support the Bands as the following: Dual-Band UMTS（WCDMA/FDD）： 850/2100 MHz； Quad-Band GSM ：850/900/DCS1800/PCS1900 MHz。 U3500 integrates the RF and Baseband onto one small PCB. It can fulfill all the functions of RF signal receiving and transmitting, Baseband signal processing and audio signal processing so that the customers can realize all kinds of their own wireless products with very few peripheral components. Designed on a single-side PCB, U3500 has a tiny dimension of 36.0mm×32.0mm×2.75mm, with a LGA pad, which provides all hardware interfaces between the module and customers’ boards. The main hardware interfaces of U3500 consist of power supply interfaces, USB interface, UART interfaces, USIM/SIM interface, Audio interfaces, PCM interface, ADC interface, VRTC interface and GPIO. U3500 is integrated with the TCP/IP protocol, it not only supports standard AT (Complied with Hayes 3GPP TS 27.007 and 27.005), but also support Longsung extended AT commands, which are very suited for developing all kinds of the customized applications. U3500 provide main interfaces for applications, the interfaces as the following: 1) Power interface 2) USB interface 3) UART interface 4) USIM/SIM interface 5) Analog audio interface 6) PCM interface 7) ADC interface 8) GPIO 9) RESET input interface 10) POWER_ON interface 11) PWM interface;
U3500_Hardware_User_Guide _V2.0 Page 13 of 82 12) RTC inteface 13) IIC inteface 14) Camera inteface 15) SD inteface 16) VCHG inteface 17) Voltage output 18) Antenna inteface
U3500_Hardware_User_Guide _V2.0 Page 14 of 82 2.1. Key features Table3：Key features of U3500 Feature Description Power supply 3.5V~4.2V (Typical 3.8V) Frequency Bands UMTS: Dual-Band, 850/2100MHz EDGE/GPRS/GSM: Quad-Band, 850/900/1800/1900MHz Data UMTS UMTS PS: 384 kbps(DL), 384 kbps(UL) EDGE EDGE: Class12, 236.8kbps(DL), 118kbps(UL) Mobile station class B Coding schemes: MCS1-9 GPRS GPRS: Class12，85.6kbps(DL)，42.8kbps(UL) Mobile station class B Coding schemes: CS1-4 Support Full PBCCH CSD UMTS CSD：57.6kbps GSM CSD：14.4kbps Special Integrated with the TCP/IP Protocol Voice(Optional) Triple-rate codec for HR, FR and EFR GSM & 3GPP: Adaptive multi-rate (AMR) Support DTMF SMS Point-to-point MO and MT SMS cell broadcast Support Text and PDU mode MMS Need AP achieve MMS Protocol Video Phone Need external CODEC; Video format H.263; Audio format G.723.1; AP achieve H.324M Protocol; H.245 Control Protocol for reliable transmission H.223 for multiplexing/de-multiplexing Protocol Operation temperature Normal operation: -20℃~+65℃ Restricted Operation: -30℃~+75℃ Storage temperature: -40℃~+85℃ ESD VBAT, GND: Air discharge ±8KV，Contact discharge ±4KV RF interface: Air discharge ±8KV，Contact discharge ±4KV Else ports: Air discharge ±4KV, Contact discharge±2KV Max power RF transition Class 4 (2 W) for GSM850/GSM900 Class 1 (1 W) for GSM1800/GSM1900 Class E2 (0.5 W) for EDGE900 Class E2 (0.4 W) for EDGE1800 Class 3 (0.25 W) for UMTS
U3500_Hardware_User_Guide _V2.0 Page 15 of 82 Current consumption Off mode: 50μA Sleep mode: <4mA Idle mode: <40mA Voice mode: <300mA Data mode: <600mA Connector Stamp hole PAD LGA PAD Stamp hole PAD Power interface 1 USB2.0 High-Speed interface 1 UART interface(can be used as GPIO) 1 standard USIM/SIM interface （Support 3V&1.8V USIM/SIM） 1 USIM/SIM detect GPIO 1 analog audio channel 1 PCM interface(can be used as GPIO) 1 hardware Reset 1 ADC interface 1 NETLIGHT interface 3 voltage output（2.6V, 1.8V, 1.5~3.05 adjustable） 1 power on interface 1 VRTC 3 GPIO 1 IIC interface 1 Camera interface 1 SD interface 1 VCHG interface 1 LCD backlight driver 3 sleep and awake GPIO Antenna interface LGA PAD 1 LCD interface(Reserved) 1 5×5 keypad interface(Reserved) 1 bluetooth 32KHz clock output(Reserved) 1 ADC interface(Reserved) 1 analog audio channel(Reserved) Dimensions 36.0mm×32.0mm×2.75mm Weight <8g Fixed structure Stamp hole PAD and LGA PAD Test points 8 test points： JTAG interface AT command Standard AT commands (Hayes 3GPP TS 27.007 and 27.005) Support LongSung Extend AT commands Approvals RoHS
U3500_Hardware_User_Guide _V2.0 Page 16 of 82 2.2. Operating modes Table4：Overview operating modes Mode Function Sleep mode Refer to the method of chapter 3.4.4.1, the module will reduce to minimal level. GSM mode GSM IDLE Software is active. Module has registered to the GSM network, and the module is ready to send and receive. GSM TALK Connection is going on between two subscribers. In this case, the power consumption depends on network settings. GPRS mode GPRS IDLE Module is ready for GPRS data transfer, but no data is currently sent or received. Power consumption depends on network settings and GPRS configuration (e.g. multi-slot settings). GPRS DATA GPRS data transfer in progress. Power consumption depends on network settings (e.g. power control level), uplink/downlink data rates and GPRS configuration (e.g. used multi-slot settings). GPRS mode EDGE IDLE Module is ready for EDGE data transfer, but no data is currently sent or received. Power consumption depends on network settings and EDGE configuration (e.g. multi-slot settings). EDGE DATA EDGE data transfer in progress. Power consumption depends on network settings (e.g. power control level), uplink/downlink data rates and EDGE configuration (e.g. used multi-slot settings). WCDMA mode WCDMA IDLE Software is active. Module has registered to the WCDMA network, and the module is ready to send and receive. WCDMA TALK Module is serving in audio. The power consumption depends on WCDMA network settings. WCDMA DATA WCDMA data transfer in progress. Power consumption depends on network settings (e.g. power control level), uplink/downlink data rates and WCDMA configuration. Minimum Function mode VBAT remains applied. Use AT+CFUN=0 to let module go into Minimum Function mode Power Down Module will go to power off mode when use AT+POWEROFF or VBAT to low.
U3500_Hardware_User_Guide _V2.0 Page 17 of 82 2.3. Hardware functional block diagram ABBPMU AudioSW WCDMATRXPA GSM TRXPARFVCTCXODDR FLASH&SDRAM DBB Stamp hole pad（83-pin: J101- J183）VBATRESETUSBUSIMPCMUARTRESETNETLIGHTGPIOSDLDOPowerOnVRTCADCVCHGLCD BacklightLGA (74-pin: J201 -J274)SpeakerMIC2MIC1ReceiverADC32.768K BT clockCameraKeypadLCDKeypad BacklightReset Figure1：U3500 Hardware functional block diagram ☆RF include： 1) WCDMA Transceiver 2) GSM Transceiver 3) SW 4) VCTCXO ☆Analog Baseband include: 1) PMU 2) Audio process unit ☆Digital Baseband include: 1) Digital Baseband chip 2) NAND FLASH and SDRAM
U3500_Hardware_User_Guide _V2.0 Page 18 of 82 2.4. Hardware interface U3500 is a Single-side Layout PCBA. Figure2：U3500 top view Figure3：U3500 bottom view
U3500_Hardware_User_Guide _V2.0 Page 19 of 82 U3500 hardware interfaces include: 1 group Test points, an antenna RF connector, a 83-pin stamp hole PAD, a groups LGA PAD.  One group Test points: As figure 2 signed “TEST PORT”. JTAG debug test points is used when module in abnormal for downloading firmware and debug module. It is only for RD engineers.  RF interface: As figure 3 signed “Antenna SMT PAD”. Stamp hole antenna SMT PAD is welded in customer mainboard directly, this interface can solder an antenna with impedance of 50Ω.  83-pin stamp hole SMT PAD: As figure 2 signed “SMT PAD”. This group provide abundant of interface, the details are describe in chapter 3.  126-pin LGA PAD: As figure 3 signed”LGA PAD”. This group is reserved, default is NC.
U3500_Hardware_User_Guide _V2.0 Page 20 of 82 3. Application interfaces description 3.1. 83-pin Stamp hole SMT PAD and 126-pin LGA PAD Figure4：U3500 83-pin stamp hole SMT PAD and 126-pin LGA PAD pin location
U3500_Hardware_User_Guide _V2.0 Page 21 of 82 Table5：U3500 pin definition 83-pin stamp hole SMT PAD PIN NO. PIN Name I/O Describe J101 GND J102 ANT Antenna interface J103 GND J104 GND J105 GND J106 AP_RDY I AP awaked and ready for communication J107 AP_IRQ I AP require BP to sleep J108 BP_IRQ 0 BP require AP to awake J109 USIM_DET I USIM/SIM card detect J110 GND J111 PCM_SYNC O PCM interface, can be used as GPIO J112 PCM_DOUT O PCM interface, can be used as GPIO J113 PCM_DIN I PCM interface, can be used as GPIO J114 PCM_CLK I PCM interface, can be used as GPIO J115 NETLIGHT O The GPIO default is NETLIGHT J116 I2C_SDA I/O Serial interface data input and output J117 I2C_SCL O Serial interface clock output J118 LCD_DRV_N O LCD backlight J119 GND J120 ADC0 2.6V, ADC J121 VREG_GP2 O 1.5~3.05V adjustable voltage output J122 VREG_MSME O 1.8V voltage output J123 VOUT O 2.6V voltage output J124 GND J125 GND J126 VBAT I 3.5~4.2V, typical 3.8V J127 VBAT I 3.5~4.2V, typical 3.8V J128 VBAT I 3.5~4.2V, typical 3.8V J129 VCHG O 4.5~7.0V, typical 5.0V J130 VREG_MMC O 2.6V, the power supply for SD card J131 SDCC1_DATA0 I/O SD Interface, can be used as GPIO J132 SDCC1_DATA1 I/O SD Interface, can be used as GPIO J133 SDCC1_DATA2 I/O SD Interface, can be used as GPIO J134 SDCC1_DATA3 I/O SD Interface, can be used as GPIO J135 SDCC1_CLK O SD Interface, can be used as GPIO J136 SDCC1_CMD O SD Interface, can be used as GPIO J137 GND J138 USIM_CLK O 1.8/3.0V
U3500_Hardware_User_Guide _V2.0 Page 22 of 82 PIN NO. PIN Name I/O Describe J139 USIM_RESET O 1.8/3.0V J140 USIM_DATA I/O 1.8/3.0V J141 USIM_VCC O 1.8/3.0V J142 USB_VBUS I 5.0V J143 USB_DM I/O USB Data- J144 USB_DP I/O USB Data+ J145 GND J146 SPK_N O Loudspeaker cathode J147 SPK_P O Loudspeaker anode J148 MIC2_N I 200mVpp(2.6Vpp,Max) J149 MIC2_P I 200mVpp(2.6Vpp,Max) J150 GND J151 CAMIF_DATA0 O Bit 0 of RGB or YUV D0 video output J152 CAMIF_DATA1 O Bit 1 of RGB or YUV D1 video output J153 CAMIF_DATA2 O Bit 2 of RGB or YUV D2 video output J154 CAMIF_DATA3 O Bit 3 of RGB or YUV D3 video output J155 CAMIF_DATA4 O Bit 4 of RGB or YUV D4 video output J156 CAMIF_DATA5 O Bit 5 of RGB or YUV D5 video output J157 CAMIF_DATA6 O Bit 6 of RGB or YUV D6 video output J158 CAMIF_DATA7 O Bit 7 of RGB or YUV D7 video output J159 CAMIF_DATA8 O Bit 8 of RGB or YUV D8 video output J160 CAMIF_DATA9 O Bit 9 of RGB or YUV D9 video output J161 CAMIF_PCLK O Pixel clock output J162 GND J163 CAMIF_MCLK I Master clock input J164 GND J165 CAMIF_HSYNC O Video horizontal line synchronization signal J166 CAMIF_VSYNC O Vertical sync output J167 CAMIF_RESET O Master reset input, active low J168 CAMIF_EN O Vidio enable J169 GND J170 VRTC I 1.5~3.25V, typical 3.0V J171 POWER_ON I 4.2V(Active low) J172 RESET I 2.6V(Active low) J173 UART_TX O UART_TX, can be used as GPIO J174 UART_RX I UART_RX, can be used as GPIO J175 UART_CTS I UART_CTS, can be used as GPIO J176 UART_RTS O UART_RTS, can be used as GPIO J177 UART_DTR I UART_DTR, can be used as GPIO J178 UART_DCD O UART_DCD, can be used as GPIO J179 UART_RI O UART_RI, can be used as GPIO
U3500_Hardware_User_Guide _V2.0 Page 23 of 82 PIN NO. PIN Name I/O Describe J180 GND J181 GND J182 GND J183 GND 74-pin LGA PAD PIN NO. PIN Name I/O Describe J201 GND J202 GND J203 GND J204 GND J205 GND J206 GND J207 GND J208 GND J209 GND J210 GND J211 GND J212 GND J213 GND J214 GND J215 GND J216 GND J217 GND J218 GND J219 KEYOUT4 O Keypad interface J220 KEYOUT3 O Keypad interface J221 KEYOUT3 O Keypad interface J222 KEYOUT1 O Keypad interface J223 KEYOUT0 O Keypad interface J224 KEYSENSE_N4 I Keypad interface J225 KEYSENSE_N3 I Keypad interface J226 KEYSENSE_N2 I Keypad interface J227 KEYSENSE_N1 I Keypad interface J228 KEYSENSE_N0 I Keypad interface J229 KPD_DRV_N O Keypad backlight J230 GND J231 LCD_RESET O LCD interface J232 LCD_CS O LCD interface J233 LCD_RS O LCD interface J234 LCD_WR O LCD interface
U3500_Hardware_User_Guide _V2.0 Page 24 of 82 PIN NO. PIN Name I/O Describe J235 LCD_RD O LCD interface J236 GND J237 GND J238 EARON O 80mVpp(4.26Vpp,Max) J239 EAROP O 80mVpp(4.26Vpp,Max) J240 MIC_N I 200mVpp(2.6Vpp,Max) J241 MIC_P I 200mVpp(2.6Vpp,Max) J242 GND J243 LCD_DB15 O LCD interface J244 LCD_DB14 O LCD interface J245 LCD_DB13 O LCD interface J246 LCD_DB12 O LCD interface J247 LCD_DB11 O LCD interface J248 LCD_DB10 O LCD interface J249 LCD_DB09 O LCD interface J250 LCD_DB08 O LCD interface J251 LCD_DB07 O LCD interface J252 LCD_DB06 O LCD interface J253 LCD_DB05 O LCD interface J254 LCD_DB04 O LCD interface J255 LCD_DB03 O LCD interface J256 LCD_DB02 O LCD interface J257 LCD_DB01 O LCD interface J258 LCD_DB00 O LCD interface J259 GND J260 32K_CLK_BT O 32KHz clock for Bluetooth J261 ADC1 I 2.6V, ADC J262 GND J263 GND J264 GND J265 GND J266 GND J267 GND J268 GND J269 GND J270 GND J271 GND J272 GND J273 GND J274 GND
U3500_Hardware_User_Guide _V2.0 Page 25 of 82 52-pin LGA PAD PIN NO. PIN Name I/O Describe J301 GND J302 GND J303 GND J304 GND J305 GND J306 GND J307 GND J308 GND J309 GND J310 GND J311 GND J312 GND J313 GND J314 GND J315 GND J316 GND J317 GND J318 GND J319 GND J320 GND J321 GND J322 GND J323 GND J324 GND J325 GND J326 GND J327 GND J328 GND J329 GND J330 GND J331 GND J332 GND J333 GND J334 GND J335 GND J336 GND J337 GND J338 GND J339 GND
U3500_Hardware_User_Guide _V2.0 Page 26 of 82 PIN NO. PIN Name I/O Describe J340 GND J341 GND J342 GND J343 GND J344 GND J345 GND J346 GND J347 GND J348 GND J349 GND J350 GND J351 GND J352 GND
U3500_Hardware_User_Guide _V2.0 Page 27 of 82 3.2. Power supply U3500 power on and power off correlative interfaces as the following: Table6：U3500 Power supply correlative interfaces PIN Name I/O PIN Num. Description VBAT I J126, J127, J128 Power supply, 3.5~4.2V, typical 3.8V VRTC I J170 1.5~3.25V, typical 3.0V VOUT O J123 Voltage output, 2.6V, 80mA VREG_GP2 O J121 Adjustabe voltage output 1.5V to3.05V VREG_MSME O J122 Voltage output, 1.8V VREG_MMC O J130 SD interface power supply POWER_ON I J171 Power on, 4.2V, Low active RESET I J172 Reset, 2.6V, Low active VCHG O J129 Li-on battery charger interface 4.5~4.7V GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND 3.2.1. Power Supply and reference design 3.2.1.1. VBAT input The power supply of U3500 should be a single voltage source with VBAT ranged from 3.5V to 4.2V. As a mobile terminal conformed to the HSPA/UTMS/GSM criterions, in some case, the ripple in a transmit burst may cause a maximum voltage drop of 450mV while the current consumption will rise to the typical peak of 2A. So the power supply must be able to provide sufficient current. The capacitor must be a larger one electrolytic capacity (recommend 2200uF/10V) or two smaller dimension tantalum capacities (470uF/6.3V) in parallel (CA) is recommended. And with a small (0.1 µF to 1µF) ceramic (CB) in parallel; the capacitors should put as close as possible to the U3500 VBAT pins.
U3500_Hardware_User_Guide _V2.0 Page 28 of 82 VBATCACB+ Figure5：U3500 VBAT input 3.2.1.2. VRTC input PINJ170 of U3500 module is VRTC interface. VRTC can be used for connecting backup rechargeable battery. When VBAT power supply is not available, the battery supplies the power to RTC core of U3500. When VBAT is available, U3500 can recharge the battery via VRTC pin. If the RTC is useless for you, you can set PINJ170 as NC. Reference design as the following: VRTCU3500RTC CoreRechargeable battery Figure6：VRTC connect to rechargeable battery If use non-rechargeable battery, the reference design as the following:
U3500_Hardware_User_Guide _V2.0 Page 29 of 82 VRTCU3500Non-rechargeable batteryRTC Core Figure7：VRTC connect to non-rechargeable battery If use a large capacitance capacity, the reference design as the following: VRTCLarge-capacitance capacitor+U3500RTC Core Figure8：VRTC connect to large capacitance capacity 3.2.1.3. VOUT、VREG_GP2、VREG_MMC voltage output During U3500 working, 2.6V voltage will output through PINJ123 of U3500, it named VOUT. The current is rated for 80mA. VOUT can be used as a power supply of the external device, such as LCD. And you can read the level of VOUT to judge whether the module is working. Besides, U3500 also provides a adjustable voltage output named VREG_GP2 through PINJ121, the range of voltage is 1.5V to 3.05V. U3500 can support SD interface, and provide a voltage VREG_MMC for it through PINJ130. 3.2.1.4. POWER_ON input The POWER_ON (PINJ171) is used to control U3500 power on. When the VBAT
U3500_Hardware_User_Guide _V2.0 Page 30 of 82 is active, POWER_ON can control U3500 to power on  If connect POWER_ON to GND in application, U3500 power on mode will be VBAT active power on mode. When VBAT is active, the module will be power on automatically. In this mode, U3500 just can be power down with VBAT set to low or off.  If application can control POWER_ON high or low level, During VBAT is active, first set POWER_ON to low level with 1000mS, U3500 will be power on. The section reference design of POWER_ON input as the figure below. The AP_PWR_CTRL is the control signal of application; it can control U3500 to power on. U3500J171AP_PWR_CTRLPOWER_ONTon Figure9：POWER_ON control module power on 3.2.1.5. RESET input The RESET (PINJ172) can control U3500 module to reset. The RESET is active by low level.  A low level pulse with 100mS will be used when set module reset. The part of RESET reference design as the figure below. AP_RESET is the control signal from the application.
U3500_Hardware_User_Guide _V2.0 Page 31 of 82 U5300J172AP_RESETRESETTst Figure10：AP_RESET control module reset 3.2.2. Power on/off control There are two methods to power on the module U3500: VBAT active power on, POWR_ON control power on. The method depends on the external circuit of the application (POWER_ON input circuit). There are two methods to power off the module U3500: AT command to power off, VBAT set to low or off. 3.2.2.1. POWER_ON control module power on Insure that the power supply of U3500 VBAT is active (3.5~4.2V, typical 3.8V).The POWER_ON must be controlled. The power on timing is as the figure below. Note: The POWER_ON must be controlled. In this method the module can be power off by AT command and set VBAT to low or off.
U3500_Hardware_User_Guide _V2.0 Page 32 of 82 VBATPOWER_ONVOUTModule State OFF Power-on sequenceTonON OFFRESET Figure11：POWER_ON control module power on timing The Ton is 1000mS. 3.2.2.2. VBAT active power on Insure that the power supply of U3500 VBAT is active (3.5~4.2V, typical 3.8V).When connect POWER_ON to GND, U3500 will be VBAT active power on mode. Note: When module is VBAT active power on mode, module only can be power off by VBAT set low or off. VBATPOWER_ONVOUTModule State OFF Power-on sequenceTonON OFFLowRESET Figure12：VBAT active power on mode timing
U3500_Hardware_User_Guide _V2.0 Page 33 of 82 3.2.2.3. AT command power off Only when module is POWER_ON control power on mode, U3500 can use AT command to power off. When module is working, and POWER_ON is high level, use AT command can let U3500 power off. Power off AT command as the following: AT+POWEROFF AT command power off timing as the figure below: VBATPOWER_ONVOUTModule State OFF Power-on sequenceTonON Power-off sequence OFFAT+POWEROFFRESET Figure13：AT command power off timing 3.2.2.4. VBAT set low or off to power off mode When the power supply of U3500 VBAT is too low (include VBAT is off), the module will be power off. 3.2.3. RESET control Control RESET (PINJ139) to set U3500 reset. The RESET is active by low level. The RESET signal must be a Tst (100mS) low pulse. Send AT+RESET can reset the U3500 too.
U3500_Hardware_User_Guide _V2.0 Page 34 of 82 VBATPOWER_ONVOUTModule State OFF Power-on sequenceTonON RESET ONRESETTst Figure14：U3500 RESET timing
U3500_Hardware_User_Guide _V2.0 Page 35 of 82 3.3. USB interface 3.3.1. USB interface description U3500 module supports a USB2.0 High-Speed interface. U3500 default PID is 0X9603. When the USB drivers of U3500 are installed, the OS will detect 3 virtual serial ports: Modem port, Diagnostic port, AT port. Table7：U3500 USB interface PIN Name I/O PIN Num. Description USB_VBUS I J142 USB power supply, 5V USB_DM I/O J143 USB data- USB_DP I/O J144 USB data+ GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND 3.3.2. USB reference circuit The USB part reference design circuit as the figure below.
U3500_Hardware_User_Guide _V2.0 Page 36 of 82 U3500C233pF C110uFR1 10RR2 10RUSB_VBUSUSB_DMUSB_DPUSB_VBUSDMDPGND123465USBBFESDESDESD Figure15：U3500 USB interface reference design circuit 1) To get the reliable USB power supply, it is recommended to use a 10uF (C1) filter capacitor and a 33pF (C2) filter capacitor. DC rated voltage of the capacitors should be above 10V; 2) To reduce the reflection caused by the high frequency alternating signal in the transmission, it is recommended to add a resistor with value below 10Ω to the DM and DP in USB interface to ensure correct transmission for USB data. Just like the resistors R1and R2; 3) To avoid static electricity in USB interface, it is recommended to use the ESD protection device. Junction capacitance of the ESD component should be less than 5pF; 4) To get the reliable USB data transfer, need protect the USB device. Such as must protect the USB_DP, USB_DM, need 90Ω impedance control, and let
U3500_Hardware_User_Guide _V2.0 Page 37 of 82 them keep away from the interference signal. 3.3.3. USB driver U3500 module support many kinds of OS, such as: Windows 2000, Windows XP, Windows Vista32/64, Windows 7, Windows CE5.0/6.0, Windows Mobile5.0/6.0. When use these systems, need special drivers for U3500. For different OS and VID and PID, the drivers are different. If need them, please contact with FAE of LongSung. The default VID and PID is: VID_1C9E & PID_9603. For Linux OS, such as Radhat, Ubuntu and Android, need the OS itself USB driver usbserial.ko. You need load the driver usbserial.ko and PID, VID to the system. 3.3.3.1. Linux OS load USB driver for U3500 Make sure there is usbserial.ko driver in your Linux system. Linux2.4.X and Linux2.6.X OS have usbserial.ko, but for some Ubuntu editions must recompile the kernel to get the usbserial.ko. The following is in PC Linux2.6.X OS load driver process. (Note: Embed Linux OS may have some difference) 1) Please insert U3500 to the AP with Linux system by USB. And make sure the power supply for U3500 is active and steady and can power on U3500; 2) Preparation of lookup USB devices by Linux usbfs filesystem, mount the USB filesystem, type the command like this: #mount -t usbfs none /proc/bus/usb 3) Check the status of AP device, in order to make sure AP is ready, we can
U3500_Hardware_User_Guide _V2.0 Page 38 of 82 type command like this: #cat /proc/bus/usb/devices Then we will get the result as the following: T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=9 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1c9e ProdID=9603 Rev= 0.00 S: Manufacturer=Qualcomm, Incorporated S: Product=Qualcomm CDMA Technologies MSM C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA I:* If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) E: Ad=84(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) E: Ad=86(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=06(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms If the USB device is ready, we can see the red characters listed above. From it, the vendor ID and product ID is 1c9e and 9603. Like Vendor=1c9e ProdID=9603 Rev= 0.00. Also, we can see three serial ports displayed by blue characters. They are diagnostic port, AT port and modem port (The ports from the top to the bottom should be like this: DIAG, AT, MODEM). 4) Install USB drivers in AP, type command like this: ＃modprobe usbserial vendor=0x1c9e product=0x9603 5) Check the status of device driver, type command like this: #cat /proc/bus/usb/devices
U3500_Hardware_User_Guide _V2.0 Page 39 of 82 You my get the result as the following: T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=3 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=1 P: Vendor=1c9e ProdID=9603 Rev= 0.00 S: Manufacturer=Qualcomm, Incorporated S: Product=Qualcomm CDMA Technologies MSM C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA I:* If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=usbserial_generic E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=usbserial_generic E: Ad=84(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=usbserial_generic E: Ad=86(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=06(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms If the driver is ready, we can see the usbserial_generic on the right side of each port. 6) Check the device point in the /dev filesystem: #cd /dev # ls ttyUSB* If the AP driver is OK, there should be ttyUSB0~ ttyUSB2. 3.3.3.2. Linux OS AP use AT to control U3500 1) Please insert the USIM/SIM card into the application terminal, make sure the USIM/SIM card with Data service already been permitted. Plug the WCDMA/GSM antenna to RF connector of U3500. Power on the module
U3500_Hardware_User_Guide _V2.0 Page 40 of 82 U3500, load the USB driver, create USB end ports: ttyUSB0~ ttyUSB2. 2) Run minicom application in Linux OS: #minicom –s In the menu of minicom select “Serial port setup”, set “Serial device ” as /dev/ttyUSB1 (Note: AT(ttyUSB1), Modem(ttyUSB2) can response AT commands, Diag (ttyUSB0) can not response AT commands); Then back to the menu of minicom and select “Save setup as df1 ”, save the configuration, then select “exit ” to exit minicom. 3) Send AT commands by minicom #minicom It should prompt as the following: Welcome to minicom 2.3 OPTIONS: I18n Compiled on Feb 24 2008, 16:35:15. Port /dev/ttyUSB1 Press CTRL-A Z for help on special keys Input AT command to open the echo of AT: ATE IF the system is running normally, it should prompt as the following: OK Input AT command to get the version of firmware: AT+LCTSW Will get the following response: SoftwareVersion: LQA0082.2.3_MG24 InnerVersion: LQA0082_240085_6.0.8W1215_EFS1.5 OK Input AT command to get the strength and BER: AT+CSQ Will get the following response: +CSQ: 20,74
U3500_Hardware_User_Guide _V2.0 Page 41 of 82 OK Input AT command to get the status of registration: AT+CREG? Will get the following response: +CREG: 0,1 OK Input AT command to get the information operator: AT+COPS? Will get the following response: +COPS: 0,0,"CHN-CUGSM",2 OK 3.3.3.2. Linux OS AP dial PPP connection 1) Repeat loading USB driver and AT communication with U3500. Make sure U3500 get the normal registration, and the strength of RF signal will be stronger than 13 (The first parameter of CSQ). 2) Make sure the Linux OS has pppd application, if it hasn’t pppd application, please install kppp, you will get pppd in your OS. 3) Create a new file: /etc/ppp/chat/gprs-connect-chat Then add messages as the following: TIMEOUT 15 ABORT "DELAYED" ABORT "BUSY" ABORT "ERROR" ABORT "NO DIALTONE"
U3500_Hardware_User_Guide _V2.0 Page 42 of 82 ABORT "NO CARRIER" TIMEOUT 40 '' \rAT OK ATS0=0 OK ATE0V1 OK AT+CGDCONT=1,"IP","3GNET" OK ATDT*99***1# CONNECT '' Note: Different USIM/SIM card which you insert in the application terminal, AT+CGDCONT=1,"IP","3GNET" will be different. Please contact the operator to get the APN and replace the parameter "3GNET". 4) Modify the configuration of pppd: /etc/ppp/options If you find the “auth”, modify it as “#auth”. The result is there aren’t ID verification. 5) Create a new file: /etc/ppp/peer/gprs Add messages as the following: (The end port must be ttyUSB2): # Usage: root>pppd call gprs /dev/ttyUSB2 9600 crtscts modem #noauth debug nodetach #hide-password usepeerdns noipdefault defaultroute
U3500_Hardware_User_Guide _V2.0 Page 43 of 82 user "3gnet" 0.0.0.0:0.0.0.0 ipcp-accept-local ipcp-accept-remote #lcp-echo-failure 12 #lcp-echo-interval 3 #noccp #novj #novjccomp #persist connect '/usr/sbin/chat -s -v -f /etc/ppp/chat/gprs-connect-chat' 6) Connect to the Internet: #pppd call gprs # ifconfig If you get the ppp0 net port means that PPP is successful. eth0 Link encap:Ethernet HWaddr 00:1D:09:33:A7:E1 inet addr:172.16.180.105 Bcast:172.16.180.255 Mask:255.255.255.0 inet6 addr: fe80::21d:9ff:fe33:a7e1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:39793 errors:0 dropped:0 overruns:0 frame:0 TX packets:17971 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3445057 (3.2 MiB) TX bytes:20088925 (19.1 MiB) Interrupt:169 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:20 errors:0 dropped:0 overruns:0 frame:0 TX packets:20 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1160 (1.1 KiB) TX bytes:1160 (1.1 KiB) ppp0 Link encap:Point-to-Point Protocol inet addr:10.182.207.113 P-t-P:10.64.64.64 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:5 errors:0 dropped:0 overruns:0
U3500_Hardware_User_Guide _V2.0 Page 44 of 82 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:62 (62.0 b) TX bytes:101 (101.0 b) 7) Testing the Internet # ping 119.75.217.56 It is the IP address of www.baidu.com. If the ping fails, we need add a route like this: #route add default gw 10.64.64.64 Note: 10.64.64.64 is the ISP address as the red character above. # ping www.baidu.com If ping www.baidu.com fails, we should add DNS to the /etc/resolv.conf 8) Disconnect the internet # killall pppd 3.4. UART interface U3500 module provides a UART interface. 3.4.1. UART interface description Table8：U3500 UART interface PIN Name I/O PIN Num. Description UART_RX I J174 RX in UART UART_TX O J173 TX in UART UART_CTS I J175 CTS in UART UART_RTS O J176 RTS in UART GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND 3.4.2. UART interface reference circuit For an application system, U3500 uses as DCE (Data Communication Equipment)
U3500_Hardware_User_Guide _V2.0 Page 45 of 82 and application terminal uses as DTE (Data terminal equipment).  If AP will use U3500 UART port as data transfer mode, the recommended DCE-DTE connection as the figure below: U3500(DCE) HOST(DTE)UART_CTSUART_RTSUART_RXUART_TXDCDDTRDSRCTSRTSRXTXRIGND GND Figure16：U3500 UART is used for data transfer  If AP will use U3500 UART port as AT commands mode, the recommended DCE-DTE connection as the figure below: U3500(DCE) HOST(DTE)UART_CTSUART_RTSUART_RXUART_TXDCDDTRDSRCTSRTSRXTXRIGND GND Figure17：U3500 UART is used for AT command 3.4.3. UART interface description 1) DATA_RTS/DATA_CTS are the hardware flow control signal, the connection should be crossed as figure 16;
U3500_Hardware_User_Guide _V2.0 Page 46 of 82 2) The baud rate of UART can be set as: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,230400, 460800, 921600, 3200000, 3686400, 4000000； Baud rate can be set by AT command. The AT command is: AT+IPR=<value> <value>: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,230400 Note: The default baud rate is 115200, and Data Bits=8, Parity=None, Stop Bits=1, Flow Control=None. 3) As the UART interface can only supply TTL level while the PC serial port is RS232 level. Level conversion device (e.g. SP3238EEA) is needed when U3500 communicating with PC; 4) It is recommended that UART interface needs ESD protect. 3.4.4. U3500 sleep and awake control In order to describe easily, it is named U3500 as BP and the MCU of application terminal as AP. Sleep and awake interface is descripted in the table below: Table9：U3500 sleep and awake interface PIN Name I/O PIN Num. 描述 AP_IRQ I J107 Set it to high, BP will sleep. BP_IRQ O J108 BP request AP to awake, set low level with 120mS. AP_RDY I J106 AP is ready, active is low level. UART_RX I J174 Set it to high level with 100mS will awake BP. USB_VBUS I J142 4.4~5.25V, typical is 5V USB_DM I/O J143 USB D- USB_DP I/O J144 USBD+ GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND
U3500_Hardware_User_Guide _V2.0 Page 47 of 82 3.4.4.1. The prerequisites for module to sleep There are 3 prerequisites for module to fall asleep, lack of any of which will cause the module unable to sleep: 1) The AP_IRQ pin is high (AP_IRQ pin is high by default when it is float); 2) UART _RX pin is kept low (UART _Rx is low by default when it is float); 3) USB is suspended by AP (if USB is not used, the prerequisites are two of the above). 3.4.4.2. About sleep and awake questions Due to the connection mode of BP and AP, may face some questions: 1) USB is not connected, nor is UART Q: How can the module fall asleep and awake up? A: The module can not fall asleep in this mode. 2) Only UART is connected Q: How can the module fall asleep and awake up? A: The module is enabled to sleep by setting the AP_IRQ high and the UART_RX to low, and is disabled to sleep by setting the AP_IRQ low or the UART_RX to high. Note: When the module receives a call/SMS/MMS/Video call, it will wake up automatically. 3) Only USB is connected Q: How can the module fall asleep and awake up? A: The module is enabled to sleep by setting the AP_IRQ high, and is disabled to sleep by setting the AP_IRQ low. The USB driver can make the USB suspend by setting the PORT_SUSPEND property, and make the USB resume by clear the PORT_SUSPEND property. The USB status (suspend resume) and the AP_IRQ status (high low) can decide the module sleep mode. Note: When the module receives a call/SMS/MMS/Video call, it will wake up automatically. 4) USB and UART are all connected Q: How can the module fall asleep? A：AP_IRQ is high and put low the UART _RX PIN and suspend the USB.
U3500_Hardware_User_Guide _V2.0 Page 48 of 82 Q: How can the module wake up? A: AP_IRQ is low and put high the UART _RX PIN and resume the USB. Q：How does the USB driver suspend and resume the USB in LINUX? A：The usbserial of the linux2.6.XX can make the USB suspend by sysfs filesystem, If the USB has been suspended, the module can suspend automatically. Q: How does the USB driver suspend and resume the USB in WINCE? A: On wince operating system, 3G module can suspend/resume by setting USB bus power level. When AP_IRQ pin is high, AP sets USB bus D4/D0 power level, then 3G module go into suspend/resume mode. When AP sets USB bus D4, 3G module enters sleep mode and USB cdc driver stop to send/receive data. If 3G module is waked up by coming call, you must set USB bus D0 power level to notify USB cdc driver to start to send/receive data, after getting BP_IRQ signal. Q: How does the module wake up AP? A: When the module awake, it will send a BP_IRQ signal (a LOW pulse of 120ms duration) to wake up the AP. If the AP is ready, it will set the AP_RDY active low to tell the module that AP is ready to communicate with the module; if the AP is not ready yet, the module will store the message into buffer until the number of the message is up to 32 and discard the message wherefrom. Note：AP_RDY must be connected, either to GND, or to AP.
U3500_Hardware_User_Guide _V2.0 Page 49 of 82 3.5. Analog audio interface U3500 provide two channels analog audio interface. 3.5.1. Audio interface description Table10：U3500 analog audio interface PIN Name I/O PIN Num. Description SPK_N O J146 Loudspeaker output differential signal - SPK_P O J147 Loudspeaker output differential signal + MIC2_N I J148 Audio input channel 2 differential signal - MIC2_P I J149 Audio input channel 2 differential signal + EARON O J238 Audio output channel 1 differential signal - EAROP O J239 Audio output channel 1 differential signal + MIC_N I J240 Audio input channel 1 differential signal - MIC_P I J241 Audio input channel 1 differential signal + 3.5.2. Audio I/O and earphone connection Table11：The connection between earphone jack and audio I/O PIN Name PIN Num. Earphone jack Description EARON J238 Left Speaker Audio output channel 1 differential signal - EAROP J239 Right Speaker Audio output channel 1 differential signal + MIC_N J240 MIC Audio input channel 1 differential signal - MIC_P J241 PGND Audio input channel 1 differential signal + 3.5.3. Audio I/O and phone handfree connection Table12：The connection between phone handle and audio I/O PIN Name PIN Num. Phone handfree Description SPK_N J146 SPK_N Loudspeaker output differential signal - SPK_P J147 SPK_P Loudspeaker output differential signal + MIC2_N J148 MIC_N Audio input channel 2 differential signal -
U3500_Hardware_User_Guide _V2.0 Page 50 of 82 MIC2_P J149 MIC_P Audio input channel 2 differential signal + 3.5.4. Audio I/O and phone handset connection Table13：U3500 analog audio and handset connection PIN Name PIN Num. Phone handset Description EAROP J238 EAR_N Audio output channel 1 differential signal - EARON J239 EAR_P Audio output channel 1 differential signal + MIC_P J240 MIC_N Audio input channel 1 differential signal - MIC_N J241 MIC_P Audio input channel 1 differential signal + 3.5.5. Analog audio interface reference circuit 10pF 33pFESD10pF 33pF10pF 33pF ESDDifferential LayoutClose to Speaker10pF 33pFESD10pF 33pF10pF 33pF ESDDifferential LayoutClose to MICMIC_P/MIC2_PMIC_N/MIC2_NEAROP/SPK_PEARON/SPK_NU3500BEADBEAD1nF1nF Figure18：Analog audio interface reference circuit
U3500_Hardware_User_Guide _V2.0 Page 51 of 82 1) The audio output signals, a pair of differential signals, output to two speakers. The output signals are not real stereo signals which are different from traditional stereo sound. 2) It is recommended to use the filter capacitor or filter circuit to reduce inter frequency interference and improve audio quality. Just like what is shown in the figure above. 3) To avoid static electricity, it is recommended to use the ESD protection device. 4) It requires connecting audio analog signal ground with the general digital circuit ground, magnetic bead or zero ohm resistance can be used. 5) IF use an audio amplifier for speaker, optional EMI filtering is shown at Fogure19, these components (two ferrite beads and two capacitors) can be added to reduce electromagnetic interference. If used, they should be located near the EAROP and EARON. 6) Considerable current between the audio output pins and the speaker, the width of PCB traces are recommended: MIC 8mils, Speaker 12mils. 3.6. PCM interface U3500 module provides a PCM interface. The PCM include 4 pin digital signals. Use PCM interface can support communication between U3500 and external CODEC. These 4 pin signals can also be used as GPIO. PCM TX data will be routed from the external codec MIC through the DSP encode path in the U3500 module. PCM RX data will be routed through the DSP decode path to the external codec speaker. The base band of U3500 can be used in two modes: 1) Auxiliary PCM, the auxiliary PCM that runs at 128 kHz and uses a 62.5 μs sync pulse (half a time frame). 2) Primary PCM, the primary PCM that runs at 2.048 MHz and uses 488 ns sync pulse (one 2.048 MHz clock tick).
U3500_Hardware_User_Guide _V2.0 Page 52 of 82 Table14：Auxiliary PCM and Primary PCM configuration Configuration SYNC CLK Clock source Format Auxiliary 8KHz 128KHz Master 8Bits μ-law, 8Bits A-law, 16Bits Linear (13 bits are valid, the others are blank) Primary 8KHz 2.048MHz Master/Slave The default configuration of U3500 is Primary PCM, and can use AT command to select Master Mode or Slave Mode. In Master mode, the U3500 module drives the clock and sync signals that are sent to the external codec via the PCM interface. In Slave mode, the external codec drives the clock and sync signals that are sent to the U3500 module. The AT command for Select PCM Master and Slave mode: AT+PCMCONFIG =<value> <value>: 0:default Master mode 1:change to Slave mode U3500 module supports 3 PCM formats: 8Bits μ-law, 8Bits A-law, 16Bits (Linear), can be set by AT command: The AT command for set PCM formats: AT+PCMAUDIO=<value> <value>: 0:default inner channel 1:change the channel to PCM 16 bit linear 2:change the channel to PCM 8 bit μ-law 3:change the channel to PCM 8 bit A-law 3.6.1. PCM interface description Table15：U3500 PCM interface PIN Name I/O PIN Num. Description PCM_SYNC O J111 PCM Synchronous Signal PCM_CLK I J114 PCM CLK PCM_DIN I J113 PCM Input
U3500_Hardware_User_Guide _V2.0 Page 53 of 82 PCM_DOUT O J112 PCM Output 3.6.2. Auxiliary PCM The Auxiliary PCM interface enables communication with an external codec to support hands-free applications. The auxiliary codec port operates with standard long-sync timing and a 128 kHz clock. The AUX_PCM_SYNC runs at 8 kHz with a 50% duty cycle. Most μ-law and A-law codecs support the 128 kHz AUX_PCM_CLK bit clock. Figure19：AUX_PCM_SYNC timing Figure20：AUX_PCM_CODEC to U3500 timing Figure21：U3500 to AUX_PCM_CODEC timing Table16：AUX_CODEC timing parameters
U3500_Hardware_User_Guide _V2.0 Page 54 of 82 3.6.3. Primary PCM U3500 module firmware default configuration is Primary PCM. PRIM_PCM_CLK is 2.048 MHz clock, PRIM_PCM_SYNC is 8 kHz (488nS), and μ-law PCM format. Figure22：PRIM_PCM_SYNC timing Figure23：PRIM_PCM_CODEC to U3500 timing
U3500_Hardware_User_Guide _V2.0 Page 55 of 82 Figure24：U3500 to PRIM_PCM_CODEC timing
U3500_Hardware_User_Guide _V2.0 Page 56 of 82 Table17：PRIM_CODEC timing parameters 3.6.4. Audio parameters control U3500 module provides 3 audio interfaces: analog audio, PCM audio, USB audio. The application terminal can select one of them to use. Use AT command can switch the audio channel. The AT command for switch USB or module audio channel: AT+AUDIOPATH=<value> <value>: 0: the audio path is model path 1: the audio path is pc path At the precondition of AT+AUDIOPATH=0, you can select analog or PCM audio: AT+PCMAUDIO=<value> <value>: 0:default inner channel (Select analog audio channel)
U3500_Hardware_User_Guide _V2.0 Page 57 of 82 1:change the channel to PCM 16 bit linear 2:change the channel to PCM 8 bit μ-law 3:change the channel to PCM 8 bit A-law U3500 module audio parameters can be adjusted by AT commands. Table18：The AT commands for control audio parameters AT Command description AT+CLVL Set Loudspeaker level AT+CMUT Disable/enable mute user voice AT+CMIC Set MIC PLUS AT+ RXVOL Setting RX volume AT+SIDET Change the Side Tone Gain Level AT+ECHO Config ESEC and Speaker device echo restrain parameter AT+ECHO1 Config HEADSET and BTHEADSET device echo restrain parameter AT+ECHOOFF Control Echo function open or close Please get reference from the document《U3500_ATC》 3.7. USIM/SIM interface U3500 module supports UTMS mode USIM card and GSM/GPRS/EDGE mode SIM card. 3.7.1. USIM/SIM interface description U3500 module supports 1.8/3.0V USIM/SIM card. Table19：U3500 USIM/SIM interface PIN Name I/O PIN Num. Description USIM_DATA I/O J140 USIM/SIM DATA USIM_CLK O J138 Clock Signal USIM_RESET O J139 RESET Signal USIM_VCC O J141 USIM/SIM Power USIM_DET I J109 USIM/SIM detect GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND
U3500_Hardware_User_Guide _V2.0 Page 58 of 82 3.7.2. USIM/SIM interface reference circuit For 6-pin USIM/SIM card, we recommend to use the Amphenol C707 10M006 512 2 SIM Holder. For more information, you can visit the Amphenlo company web: http://www.amphenol.com/ The SPEC of C707 10M006 512 2 SIM Holder is as the figure below.
U3500_Hardware_User_Guide _V2.0 Page 59 of 82 Figure25：C707 10M006 512 2 SIM Holder SPEC USIM/SIM interface reference design circuit as the the figure below.
U3500_Hardware_User_Guide _V2.0 Page 60 of 82 U35002222USIM_VCCUSIM_RESETUSIM_CLKUSIM_DATA33pF100nFVCCRSTCLKGNDVPPIO1236542215K33pFESDESDESDESDUSIM_DETUSIM_DETECT Figure26：U3500 USIM/SIM interface reference circuit 1) The USIM_DATA line of USIM is connected to USIM_VCC by a pull-up resistor with reference value 10KΩ. 2) To avoid the instantaneous voltage overflowing, the resistor with reference value 22Ω can be used for the USIM_DATA, USIM_CLK and USIM_RESET line. 3) To avoid the static electricity in USIM socket, it is recommended to use the ESD protection device for the USIM_DATA, USIM_CLK and USIM_VCC line. 4) To get more flat USIM power supply, it is recommended to use the filter capacitors, and reference value 33pF and 100nF. 5) To eliminate the peak interference and high frequency interference signal on USIM_RESET line, the filter capacities can be placed in USIM_RESET line, the reference value is 33pF. Note: The U3500 can not support USIM/SIM card hot-plugging. If you hot-plug the USIM/SIM card, may cause the card or U3500 USIM/SIM interface damage. Please avoid it. 3.8. NETLIGHT output U3500 module provides 1 NETLIGHT output interface through PINJ115.
U3500_Hardware_User_Guide _V2.0 Page 61 of 82 3.8.1. NETLIGHT signal description Table20：U3500 NETLIGHT signal description PIN Name I/O PIN Num. Description NETLIGHT O J115 Default Netlight Table21：U3500 net light description 模式 LED Status Description 1 快闪 (100ms On/800ms Off) Networks searching 2 慢闪(100ms On/3000ms Off) Registered in networks 3 速闪(100ms On/300ms Off) Data connection in networks 4 关闭 Flying mode or Power off or Error(No SIM card or failed in registering networks ) 3.8.2. NETLIGHT reference circuit The NETLIGHT reference circuit is shown in the figure below. NETLIGHT2KVBAT Figure27：U3500 NETLIGHT reference circuit 3.9. ADC interface U3500 module provides two 8Bits ADC interface, which can be used for battery voltage detect, temperature detector or hardware version detector.
U3500_Hardware_User_Guide _V2.0 Page 62 of 82 3.9.1. ADC interface description Table22：U3500 ADC interface description PIN Name I/O PIN Num. Desription ADC0 I J120 2.6V ADC1 I J261 2.6V 3.9.2. ADC input reference circuit ADC can be used for battery voltage detector, temperature detector or hardware version detector. The max input to ADC is 2.6V. BatteryTemperatureHW_VersionU3500Input MUXS2CsVADCS1 RinRs 10KACQV+_ADC0/1 Figure28：U3500 ADC input reference circuit 3.9.3. Temperature detector circuit Temperature U3500Input MUXS2CsVADCS1 RinRs 10KACQADC0/1VREF=2.6VR1 47K R2 Figure29：U3500 temperature detector circuit
U3500_Hardware_User_Guide _V2.0 Page 63 of 82 R1 is a precision resistor; R2 is a heat-sensitive resistor. VREF is recommended to 2.6V.  If the HKADC is used for battery voltage detector, because the battery voltage exceed 2.6V, so must use two precision resistors to create a voltage divider circuit, make sure the input to ADC is below 2.6V.  If the ADC is used for hardware version detector, use several resistors to get different voltage input to ADC. 3.10. GPIO interface U3500 module provides several GPIO; some of them are defined as special function interface. Table23：U3500 GPIO interface description PIN Name I/O PIN NO. Description PCM_DOUT O J112 Default PCM_DOUT PCM_CLK I J114 Default PCM_CLK PCM_DIN I J113 Default PCM_DIN PCM_SYNC O J111 Default PCM_SYNC AP_IRQ I J107 Default AP_RDY AP_RDY I J106 Default AP_RDY BP_IRQ O J108 Default BP_IRQ UART_TX O J173 Default UART_TX UART_RX I J174 Default UART_RX UART_CTS I J175 Default UART_CTS UART_RTS O K176 Default UART_RTS GPIO1 I/O J179 Can be used as UART_RI GPIO2 I/O J178 Can be used as UART_DCD GPIO3 I/O J177 Can be used as UART_DTR NETLIGHT O J115 Default NETLIGHT 3.11. Antenna interface U3500 provide a stamp hole antenna interface through PINJ102.
U3500_Hardware_User_Guide _V2.0 Page 64 of 82 Table24：U3500 antenna interface PIN Name I/O PIN Num. Description ANT J102 Antenna GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND U3500 module provides two types antenna interfaces: RF Connector and antenna pad.  We recommend customer use RF Connector, and use RF cable to plug an antenna with 50Ω ground impedance.  In the bottom side customer can solder an antenna with 50Ω ground impedance. When you use RF Connector, please select the RF cable carefully; it is required to use RF cable of which the insertion loss should comply with:  GSM900/GSM850<1dB  DCS1800/PCS1900<1.5dB  WCDMA2100<1.5dB  WCDMA850<1dB 3.11.1. Solder antenna The reference circuit of U3500 solder antenna is shown in below: U3500GNDGNDANTGND27pFGNDL1C2NAC10RC3NA2.0×2.0mm3.0×3.0mmTP1TP2Close to TP1 Figure30：U3500 solder antenna reference circuit
U3500_Hardware_User_Guide _V2.0 Page 65 of 82 3.11.2. RF connector antenna Portion of the antenna diagram about the antenna using the connector as below： U3500GNDGNDANTGND27pFGNDL1C2NAC10RC3NAClose to J1J1 MM9329-2700RA1 Figure31： The reference design of RF connector and antenna 3.11.2.1. RF cable When you use RF Connector, please select the RF cable carefully; it is required to use RF cable of which the insertion loss should comply with:  GSM900/GSM850<1dB  DCS1800/PCS1900<1.5dB  WCDMA2100<1.5dB  WCDMA850<1dB 3.11.3. U3500 RF output power Table25：U3500 RF output power Band Max Min GSM850 33dBm ± 2dB 5dBm ± 5dB E-GSM900 33dBm ± 2dB 5dBm ± 5dB DCS1800 30dBm ± 2dB 0dBm ± 5dB PCS1900 30dBm ± 2dB 0dBm ± 5dB GSM850(8-PSK) 27dBm ± 3dB 5dBm ± 5dB E-GSM900(8-PSK) 27dBm ± 3dB 5dBm ± 5dB
U3500_Hardware_User_Guide _V2.0 Page 66 of 82 Band Max Min DCS1800(8-PSK) 26dBm +3/-4dB 0dBm ± 5dB PCS1900(8-PSK) 26dBm +3/-4dB 0dBm ± 5dB WCDMA2100 24dBm +1/-3dB -56dBm ± 9dB WCDMA850 24dBm +1/-3dB -56dBm ± 9dB 3.11.4. U3500 RF receiver sensitivity Table26：U3500 RF receiver sensitivity Band Receive sensitivity GSM850 <-106dBm E-GSM900 <-106dBm DCS1800 <-106dBm PCS1900 <-106dBm WCDMA2100 <-108dBm WCDMA850 <-106dBm 3.11.5. U3500 operating frequencies Table27：U3500 operating frequencies Band Receive Transmit GSM850 869~894MHz 824~849MHz E-GSM900 925~960MHz 880~915MHz DCS1800 1805~1880MHz 1710~1785MHz PCS1900 1930~1990MHz 1850~1910MHz WCDMA2100 2110~2170MHz 1920~1980MHz WCDMA850 869~894MHz 824~849MHz 3.11.6. Antenna parameters requirement Table28：U3500 antenna parameters requirement Band VSWR Gain Efficiency SAR TRP (dBm) TIS (dBm) Peak Avg. GSM850 <2.5:1 >0dBi >-4dBi >40% <1.6 W/Kg 29 <-102 EGSM900 29 <-102 DCS1800 26 <-102 PCS1900 26 <-102 WCDMA850 19 <-102
U3500_Hardware_User_Guide _V2.0 Page 67 of 82 WCDMA2100 19 <-104 3.12. Micro SD card interface U3500 provide a Micro SD card interface for extending the system storage, this interface can be designed as a T-Flash card and MMC card too. 3.12.1. Micro SD card interface description Table29：U3500 Micro SD card interface PIN Name I/O PIN Num. Description VREG_MMC O J130 2.6V, the power supply for SD card SDCC1_DATA0 I/O J131 SD Interface, can be used as GPIO SDCC1_DATA1 I/O J132 SD Interface, can be used as GPIO SDCC1_DATA2 I/O J133 SD Interface, can be used as GPIO SDCC1_DATA3 I/O J134 SD Interface, can be used as GPIO SDCC1_CLK O J135 SD Interface, can be used as GPIO SDCC1_CMD O J136 SD Interface, can be used as GPIO GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND 3.12.2. Micro SD interface reference circuit
U3500_Hardware_User_Guide _V2.0 Page 68 of 82 U3500VREG_MMC33pF810KSDCC1_DATA2SDCC1_DATA3SDCC1_CMDSDCC1_CLKSDCC1_DATA0J312354671110912SDCC1_DATA110K10K10K10K33pF33pF33pF33pF33pF33pF100nFLS_PS_MC_001 Figure32：U3500 Micro SD card interface reference circuit 1) Data line SDCC1_DATA0, SDCC1_DATA1, SDCC1_DATA2, SDCC1_DATA3 and SDCC1_CMD should be pulled-up to VREG_MMC by a 10Kohm resistor; 2) For stabling the VREG_MMC, where should connect two filter capicator to GND with value 33pF and 100nF; 3) For eliminating the high frequence disturb, where should connect a filter capicator to GND with value 33pF; 4) For improving the ESD performance, where should connect ESD protect device close the MicroSD connector. 3.13. Camera interface U3500 provide a camera interface, which include:  10 bits bus data, which are used for video data input;  Horizotal and vertical synchronous signals;  Two IIC bus, which are used for controlling the U3500 and the camera. 3.13.1. Camera interface description Table30：U3500 Camera interface PIN Name I/O PIN Num. Description CAMIF_DATA0 O J151 Bit 0 of RGB or YUV D0 video output CAMIF_DATA1 O J152 Bit 1 of RGB or YUV D1 video output
U3500_Hardware_User_Guide _V2.0 Page 69 of 82 CAMIF_DATA2 O J153 Bit 2 of RGB or YUV D2 video output CAMIF_DATA3 O J154 Bit 3 of RGB or YUV D3 video output CAMIF_DATA4 O J155 Bit 4 of RGB or YUV D4 video output CAMIF_DATA5 O J156 Bit 5 of RGB or YUV D5 video output CAMIF_DATA6 O J157 Bit 6 of RGB or YUV D6 video output CAMIF_DATA7 O J158 Bit 7 of RGB or YUV D7 video output CAMIF_DATA8 O J159 Bit 8 of RGB or YUV D8 video output CAMIF_DATA9 O J160 Bit 9 of RGB or YUV D9 video output CAMIF_PCLK O J161 Pixel clock output CAMIF_MCLK I J163 Master clock input CAMIF_HSYNC O J165 Horizontal line synchronization signal CAMIF_VSYNC O J166 Vertical sync output CAMIF_RESET O J167 Master reset input, active low CAMIF_EN O J168 Vidio enable I2C_SDA I/O J116 Serial interface data input and output I2C_SCL O J117 Serial interface clock output GND J101, J103~105, J110, J119, J124~125, J137, J145, J150, J162, J164, J169, J180~183, J201~218, J230, J236~237, J242, J259, J262~274, J301~352 GND 3.13.2. Camera interface reference circuit U3500 provide a camera interface, which support the YUV format, the maximum pixel is 2M, the voltage level is 2.6V.
U3500_Hardware_User_Guide _V2.0 Page 70 of 82 47K24 Y02.2uF100nF2.2uF100nFU3500J4 23 Y122 Y221 Y320 Y419 Y518 Y617 Y716 Y815 Y914 SIO_C13 SIO_D PWDN 1HREF 2VSYNC 3RESET 4DVDD_1.8V 5DOVDD_2.8V 6AVDD 7AGND 8PCLK 9DGND 10MCLK 11DGND 12CAMIF_DATA0CAMIF_DATA1CAMIF_DATA2CAMIF_DATA3CAMIF_DATA4CAMIF_DATA5CAMIF_DATA6CAMIF_DATA7CAMIF_DATA8CAMIF_DATA9I2C_SCLI2C_SDAEMICAMIF_HSYNCCAMIF_VSYNCCAMIF_RESETCAM_1V5CAM_2V8CAMIF_MCLKCAMIF_PCLKCAMIF_EN47KVOUTNCNCU11 VIN2.2uF100K2 GND3 ENVOUT 5BP 4VBATCAMIF_EN22nF2.2uFCAM_2V8U21 VIN2.2uF100K2 GND3 ENVOUT 5BP 4VBATCAMIF_EN22nF2.2uFCAM_1V5LS_RT9193_28PU5 LS_RT9193_15PU5 Figure33：U3500 Camera interface reference circuit 3.14. Keypad interface U3500 provide a 5*5 keypad matrix, for the non-customized customer, these pins can be floated. 3.15. LCD interface U3500 provide a LCD interface, which support the format of QVGA, the maximum pixel is 320*240, the voltage level is 1.8V, for non-customized customer, these pins can be floated.
U3500_Hardware_User_Guide _V2.0 Page 71 of 82 3.16. 32K_CLK_BT interface U3500 provide a 32KHz clock for Bluetooth, for non-customized customer, these pins can be floated.
U3500_Hardware_User_Guide _V2.0 Page 72 of 82 4. Mechanics 4.1. The view of U3500 Figure34：The top and bottom view of U3500 4.2. Module 3D stack If you need the 3D stack of U3500, please contact us to obtain it.
U3500_Hardware_User_Guide _V2.0 Page 73 of 82 4.3. Module 2D mechanical dimensions Figure35：U3500 2D mechanical dimensions 4.4. Application side decals of U3500 The decals include schematic decal and PCB decal. Please contact us to obtain them. 4.5. RF connector U3500 module side uses a RF connector for WCDMA/GSM antenna. The RF connector is MURATA MM9329-2700RA1. We recommend customer select a RF cable with a MURATA MXTK88TK2000 RF connector.
U3500_Hardware_User_Guide _V2.0 Page 74 of 82 4.5.1. Module side RF connector Figure36：The mechanical dimensions of MM9329-2700RA1 4.5.2. Application side RF connector We recommend customer use MURATA MXTK88TK2000 in application side. The mechanical dimensions of MURATA MXTK88TK2000 RF connector is shown at figure below.
U3500_Hardware_User_Guide _V2.0 Page 75 of 82 Figure37：The mechanical dimensions of MXTK88TK2000
U3500_Hardware_User_Guide _V2.0 Page 76 of 82 5. Power consumption U3500 current consumption (VBAT Power supply: DC3.8V) is shown in Table28. Table31：U3500 max current consumption in some mode Band Channel Power(dBm) Current(mA) TALK mode（GSM） GSM850 128 32.1 298 189 32 296 251 31.8 294 GSM900 975 32.5 290 38 32.5 289 124 32.3 268 DCS1800 512 29.4 241 698 29.6 232 885 29.4 219 PCS1900 512 29.5 203 661 29.3 194 810 29.4 192 DATA mode GPRS（1Rx，4Tx） GSM850 128 25.9 512 189 25.7 495 251 25.5 487 GSM900 975 25.6 495 38 25.6 471 124 25.3 432 DCS1800 512 24.2 434 698 24.2 420 885 24 392 PCS1900 512 24.2 362 661 24 345 810 24.2 343 DATA mode EGPRS（1Rx，4Tx） GSM850 128 22.6 376 189 22.5 369 251 22.3 365 GSM900 975 22.3 365 38 22.1 352 124 22.1 327 DCS1800 512 22.3 367
U3500_Hardware_User_Guide _V2.0 Page 77 of 82 698 22.3 356 885 22.1 334 PCS1900 512 22.5 311 661 22.3 297 810 22.4 295 DATA mode （WCDMA） W2100 10562 22.7 545 10700 22.3 461 10838 22.2 495 W850 4357 22 461 4408 22.1 455 4458 22 488 Sleep mode current consumption Band Setting Current(mA) GSM850 2 3.2 5 2.1 9 1.5 GSM900 2 3.1 5 1.9 9 1.5 DCS1800 2 3.1 5 1.8 9 1.5 PCS1900 2 2.9 5 2 9 1.4 W2100 6 3.9 7 2.4 9 0.8 W850 6 3.9 7 2.7 9 0.8
U3500_Hardware_User_Guide _V2.0 Page 78 of 82 6. Electrical characteristics 6.1. Absolute maximum power ratings Absolute maximum power ratings for power supply and the voltage on digital and analog pins of U3500 module are listed in the Table29. Out of the range, the module should be damaged. Table32：Absolute maximum power ratings Parameter Description Min Typ Max Unit VBAT U3500 power supply -0.3 3.8 4.2 V RMS average current 0 0.9 A Voltage drop during transmit burst, IVBA peak current may up to 2A (Per 4.6ms) 400 mV USB_VBUS USB power supply 5.0 5.25 V GPIO Digital IO voltage -0.3 2.6 3.0 V Voltage in power off mode -0.25 0.25 V ADC Analog input -0.3 2.6 3.0 V 6.2. Operating temperatures U3500 module can normal operate in the environment temperature in -20~+65℃. If you will use it in the environment which out of the range, we recommend customer has some method to control the temperature around U3500 module. In the restricted operation temperature, some RF parameter may out of the 3GPP RF standard. The module can work, such as voice, SMS, data. In the storage temperature, the module may be not able to work, just for storage. The temperature out of the range, the U3500 module should be damaged. Table33：U3500 module operating temperature
U3500_Hardware_User_Guide _V2.0 Page 79 of 82 Temperature Min Typ Max Unit Normal operation temperature -20 25 65 ℃ Restricted operation temperature -30 ~ -20 65 ~ 75 ℃ Storage temperature -40 80 ℃
U3500_Hardware_User_Guide _V2.0 Page 80 of 82 6.3. Interface operating status VL: logistic Low level VH: logistic High level Table34：Digital Signal DC Characteristics Signal VL VH Unit Min Max Min Max Input -0.3 0.35* VDD-PX 0.65* VDD-PX VDD-PX+0.3 V Output GND 0.45 VDD-PX -0.45 VDD-PX V Note: VDD-PX=2.5~2.7V Table35：U3500 power supply range Parameter I/O Min Typ Max Unit VBAT I 3.5 3.8 4.2 V USB_VBUS I 4.4 5.0 5.25 V USIM_VCC O 1.7/2.75 1.8/2.85 1.9/2.95 V 6.4. Reliability Table36：Requirements on the environment reliability Test case Test requirement Low temperature Storage test -40℃±3 ℃, power off mode storage 24 hours High temperature Storage test +85℃±3 ℃, power off mode storage 24 hours Temperature change test In power off mode, between -40℃ and +85℃, stay 0.5h, change time <3min, total 24 times High temperature high humidity test Temperature: +85℃±3 ℃ Humidity: 90~95%RH Power off mode storage 24 hours Low temperature operating -20℃±3 ℃, keep operating for 24 hours High temperature operating +65℃±3 ℃, keep operating for 24 hours
U3500_Hardware_User_Guide _V2.0 Page 81 of 82 Test case Test requirement Vibration test Vibration test requirement: Frequency Random Vibration ASD 5~20Hz 0.96m2/s3 20~500Hz 0.96m2/s3(20Hz), else -3dB/times frequency Connector Life Test Board-to-board connector plug 50 times; RF connector plug 30 times ESD test 1, When module in voice mode, discharge antenna port, VBAT PAD and GND, ESD must meet the following targets: 1) Contact discharge pass: ±2KV、±4KV test class 2) Air discharge pass: ±2KV、±4KV、±8KV test class 2, When module in voice mode, discharge SIM card hold of EVB, ESD must meet the following targets: 1) Contact discharge pass: ±2KV test class 2) Air discharge pass: ±2KV、±4KV test class
U3500_Hardware_User_Guide _V2.0 Page 82 of 82 6.5. Electrostatic discharge U3500 module is a consumptive product. Although the module has some ESD protect function, we recommend in application need more ESD protect means to avoid the static electricity from the application environment, please reference to the interface reference design circuit. In order to improve the antistatic performance of the system, we recommend customer is advised of the following main board: layout an exposed copper under the module U3500, U3500 shield frame solder feet welded to the customer board. The solder feet, copper, solder feet and GND are connected. The ESD capacity of U3500 is listed in the table below. Table37：The ESD endure status measured table (Temperature: 25℃, Humidity: 45%) Part Air discharge Contact discharge VBAT,GND ±8KV ±4KV Antenna port ±8KV ±4KV Other port ±4KV ±2KV

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