AirM2M Communication Technology AIR208 GSM/GPRS Module User Manual
Shanghai AirM2M Communication Technology Co., Ltd GSM/GPRS Module
User Manual
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| Document Description | User Manual |
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| Date Submitted | 2018-04-26 00:00:00 |
| Date Available | 2018-04-26 00:00:00 |
| Creation Date | 2018-01-29 15:15:35 |
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Air208_Hardware Design Manual_V1.03 Air208 Hardware Design Manual Version number Modify record Date Date V1.0 Newly build 2017‐8‐10 jinyi V1.01 Modifies the main serial port on baud rate training content 2017‐9‐16 Guowen V1.02 Adds pin description of the boot key booting and shutdown 2017‐11‐03 Guowen 2017‐12‐13 Loukanghua machine V1.03 Updates pin diagram Page2 Totally 57 pages Air208 Hardware Design Manual Catalog 1. TABLE CATALOG ............................................................................................................................................................ 6 2.1. RELATED DOCUMENTS.............................................................................................................................................................7 3. SUMMARY................................................................................................................................................................................ 8 3.1. FUNCTION CHART.................................................................................................................................................................10 3.2. EVALUATION BOARD.......................................................................................................................................................11 4. APPLICATION INTERFACE....................................................................................................................................................... 11 4.1. PIN DESCRIPTION..................................................................................................................................................................12 4.2. WORKING MODE..................................................................................................................................................................18 4.3. POWER SUPPLY....................................................................................................................................................................19 4.3.1. Module power supply working characteristics........................................................................................................19 4.3.2. Reduce voltage drop................................................................................................................................................ 19 4.3.3. Power supply reference circuit.................................................................................................................................20 4.4. BOOT AND SHUTDOWN......................................................................................................................................................... 21 4.4.1. Boot..........................................................................................................................................................................21 4.4.2. Shutdown.................................................................................................................................................................22 4.5. POWER SAVING TECHNOLOGY.................................................................................................................................................24 4.5.1. Least functional mode............................................................................................................................................. 24 4.5.2. Sleep Mode (Slow Clock Mode）.............................................................................................................................24 4.5.3. Sleep wake............................................................................................................................................................... 25 4.6. MODE SWITCHING SUMMARY................................................................................................................................................25 4.7. SERIAL PORT....................................................................................................................................................................... 25 4.7.1. Main serial port....................................................................................................................................................... 27 4.7.2. Debug serial port..................................................................................................................................................... 29 4.7.3. Serial port application............................................................................................................................................. 30 4.8. AUDIO INTERFACE................................................................................................................................................................ 32 4.8.1. Preventing TDD noise and other noises...................................................................................................................32 4.8.2. Microphone interface reference circuit................................................................................................................... 33 4.8.3. Audio output interface reference circuit..................................................................................................................33 4.8.4. Audio Electrical characteristics................................................................................................................. 34 4.9. SIM CARD INTERFACE..................................................................................................................................................... 35 4.9.1. SIM INTERFACE....................................................................................................................................................... 35 4.9.2. 6-pin SIM card holder.............................................................................................................................................36 4.10. RI SIGNAL ACTION........................................................................................................................................................ 38 4.11. NETWORK STATUS INDICATION............................................................................................................................................. 40 4.12. PWM............................................................................................................................................................................. 41 5. RADIO INTERFACE...................................................................................................................................................................41 5.1. RF REFERENCE CIRCUIT..........................................................................................................................................................42 5.2. RF CONDUCTION SENSITIVITY........................................................................................................................................ 44 Page3 Totally 57 pages Air208 Hardware Design Manual 5.3. RECOMMENDED RF WELDING METHOD....................................................................................................................................45 6. ELECTRICAL CHARACTERISTICS, RELIABILITY, RF CHARACTERISTICS.................................................................................... 46 6.1. ABSOLUTE MAXIMUM...........................................................................................................................................................46 6.2. WORKING TEMPERATURE....................................................................................................................................................... 46 6.3. VOLTAGE LIMIT VALUE...........................................................................................................................................................47 6.4. CURRENT CONSUMPTION.......................................................................................................................................................49 6.5. STATIC PROTECTION............................................................................................................................................................. 50 7. PHYCIAL DIMENSION..............................................................................................................................................................51 7.1. MODULE PHYCIAL DIMENSION................................................................................................................................................ 52 7.2. RECOMMENDED PCB ENCAPSULATION.................................................................................................................................... 53 7.3. MODULE FRONT VIEW...........................................................................................................................................................54 7.4. MODULE BOTTOM VIEW........................................................................................................................................................55 8. STORAGE AND PRODUCTION.................................................................................................................................................55 8.1. STORAGE............................................................................................................................................................................ 55 8.2. PRODUCTION WELDING......................................................................................................................................................... 56 Page4 Totally 57 pages Air208 Hardware Design Manual Chart Catalog CHART 1 ：FUNCTIONAL BLOCK DIAGRAM.................................................................................................10 CHART 2 ：PIN ARRANGEMENT (FRONT VIEW）................................................................................. ...............12 CHART 3 ：VOLTAGE AND CURRENT WAVEFORM SOF M ODULE EMISSION........................................................... 19 CHART 4 ：VBAT INPUT REFERENCE CIRCUIT.............................................................................................20 CHART 5 ：POWER INPUT REFERENCE DESIGN....................................................................................................21 CHART 6 ：OPEN SET DRIVER REFERENCE BOOT CIRCUIT........................................................................................22 CHART 7 ：BUTTON BOOTREFERENCE CIRCUIT............................................................................................... ......22 CHART 8 ：OPEN DRIVER REFERENCE EMERGENCY SHUTDOWN CIRCUIT.....................................................................23 CHART 9 ：BUTTON EMERGENCY SHUTDOWNREFERENCE CIRCUIT.............................................................................24 CHART 10 ：FULL‐FEATURED SERIAL PORT CONNECTION DIAGRAM ...........................................................................28 CHART 11 ：SERIAL THREE‐WIRE CONNECTION DIAGRAM.........................................................................................28 CHART 12 ：SCHEMATIC DIAGRAM OF SERIAL CONNECTION MODE WITH FLOW CONTROL...............................................29 CHART 13 ：SOFTWARE DEBUGGING CONNECTION DIAGRAM....................................................................................29 CHART 14 ：3.3V LEVEL CONVERSION CIRCUIT......................................................................................................30 CHART 15 ：5VLEVEL CONVERSION CIRCUIT...........................................................................................................31 CHART 16 ：RS232 LEVEL CONVERSION CIRCUIT....................................................................................................31 CHART 17 ：AIN MICROPHONE CHANNEL INTERFACE CIRCUIT.......................................................................33 CHART 18 ：REFERENCE LINE................................................................................................................................34 CHART 19 ：USING A 6PIN SIM CARD REFERENCE SCHEMATIC (SIM).........................................................................35 CHART 20 ：WITH THE DETECTION OF PIN SIM CARD REFERENCE CIRCUIT DIAGRAM....................................36 CHART 21 ：AMPHENOL C707 10M006 512 2 SIMCASSETTE..............................................................................37 CHART 22 ：THE MODULE IS USED AS CALLED PARTY RI TIMING FOR VOICE CALL............................................................38 CHART 23 ：THE MODULE IS USED AS CALLED PARTY RI TIMING FOR DATA CALL.............................................................39 CHART 24 ：RI TIMING OF MODULE CALLING...........................................................................................................39 CHART 25 ：RI TIMING WHEN RECEIVING URC MESSAGE OR SMS...............................................................................39 CHART 26 ：NETLIGHTREFERENCE CIRCUIT.........................................................................................................40 CHART 27 ：RF REFERENCE CIRCUIT.........................................................................................................................42 CHART 28 ：SUGGESTION ON RF WELDING METHOD...................................................................................................45 CHART 29 ：AIR208 FRONT VIEW (UNIT: MM）.......................................................................................................52 CHART 30 ：RECOMMENDED ENCAPSULATION (UNIT: MM)..........................................................................................53 CHART 31 ：MODULE FRONT VIEW...........................................................................................................................54 CHART 32 ：MODULE BOTTOM VIEW.........................................................................................................................55 CHART 33 ：PASTE MAP.................................................................................................................................... ......56 CHART 34 ：FURNACE TEMPERATURE CURVE................................................................................................................57 Page5 Totally 57 pages Air208 Hardware Design Manual 1. Table Catalog TABLE 1 ：RELATED DOCUMENTS..................................................................................................................................................... 7 TABLE 2 ：MAIN FEATURES OF THE MODULE......................................................................................................................................8 TABLE 3 ：AIR208 PIN ALLOCATION..............................................................................................................................................13 TABLE 4 ：PIN DESCRIPTIO............................................................................................................................................................ 14 TABLE5 ：GPIO CONFIGURATION TABLE............................................................................................................................................17 TABLE 6 ：WORK MODE............................................................................................................................................................... 18 TABLE 7 ：MODE SWITCHING SUMMARY......................................................................................................................................... 25 TABLE8 ：SERIAL LOGIC LEVEL.......................................................................................................................................................... 26 TABLE 9 ：DEFINITION OF SERIAL PORT PINS.....................................................................................................................................26 TABLE10 ：AUDIO INTERFACEPIN DEFINITION..................................................................................................................................... 32 TABLE 11 ：TYPICAL CHARACTERISTICS OF ELECTRET MICROPHONES..................................................................................................... 34 TABLE 12 ：AUDIO INTERFACETYPICAL CHARACTERISTIC PARAMETERS.................................................................................................. 34 TABLE13 ：SIM CARD INTERFACEPIN DEFINITION...........................................................................................................................35 TABLE 14 ：RI SIGNAL ACTION................................................................................................................................................. 38 TABLE 15 ：NET_LED WORKING STATUS.....................................................................................................................................40 TABLE 16 ：RF_ANTPIN DEFINITION........................................................................................................................................... 41 TABLE 17 ：RFCONDUCTION POWER............................................................................................................................................. 44 TABLE 18 ：RF CONDUCTION SENSITIVITY...............................................................................................................................44 TABLE 19 ：MODULE WORKING FREQUENCY.................................................................................................................................... 45 TABLE20 ：ABSOLUTE MAXIMUM.................................................................................................................................................... 46 TABLE 21 ：WORKING TEMPERATURE..............................................................................................................................................46 TABLE 22 ：MODULE POWER LIMIT VALUE...................................................................................................................................... 47 TABLE 23 ：MODULE'S CURRENT CONSUMPTION.............................................................................................................................. 49 TABLE 24 ：ESDP ERFORMANCE PARAMETERS (TEMPERATURE: 2 5 C , HUMIDITY: 4 5 % ) ）................................................................50 Page6 Totally 57 pages Air208 Hardware Design Manual 2. Introduction This document defines the Air208 module and hardware interface specification, electrical and mechanical details. With the help of this document, combining with the application manual and user guide, customers can quickly apply Air208 module for wireless applications. 2.1. Related documents Table 1：Related documents Item File name Remarks Detailed explanation of Air208_AT instruction set Has been published Air208 Reference design Has been published Air208 module encapsulation Has been published Luat_AIR2XX upgrading tool1.1 Has been published Trace Reference design Has been published LuaForWindows_v5.1.5‐51 Has been published Coolwatcher debugging tools and instructions _V1.1 Has been published Platform compilation environment and installation steps Has been published CSDTK3.7_Cygwin1.5.25_Svn_1.5.4_Full_Setup Has been published Page7 Totally 57 pages Air208 Hardware Design Manual 3. Summary Air208 module is the two band GSM/GPRS module, its working frequency bands are: GSM850MHz, WC^ϭ900MHz. Air208 CS‐1, CS‐2, CS‐3 and CS‐4. supports GPRS multi slot level 12 and GPRS encoding formats With the ultra small size of 17.6mm * 15.7mm * 2.3mm, Air208 is able to meet all the needs of M2M, including cars and personal tracking services, wireless POS, smart metering, industrial PDA and other M2M applications. Air208 is built‐in 32MbNorFlash + 32MbSRAM. Air208 is a chip‐on‐module, with a LCC package that can be embedded in customer applications with its pin‐on‐land, providing a rich hardware interface between the module and the customer's motherboard. Air208 module uses a power‐saving technology, current consumption in sleep mode DRX = 5, as low as 1.14mA. Air208 embeds protocols such as TCP UDP PPP HTTPS SSL and built‐in extended AT commands to make it easier for users to use these Internet protocols. Air208 complies with the RoHS standard. Table 2：Main features of the module Feature Description Band ♦ ♦ ♦ ♦ Quad‐band：GSM850，3CSϭϵϬϬ Automatic frequency band search Band selection can be set by AT command Meets GSM Phase 2/2+ Transmitting power ♦ ♦ Class 4 (2W)：GSM850 Class 1 (1W)： WCS1ϵ00 Power supply ♦ DC 3.8V Power saving mode current consumption ♦ ♦ ♦ 1.40mA@DRX=2 1.14 mA@ DRX=5 1.03 mA@ DRX=9 GPRS Connection characteristic ♦ ♦ GPRS multi slot level is 12 (default) GPRS mobile level B Page8 Totally 57 pages Air208 Hardware Design Manual ♦ ♦ ♦ ♦ ♦ Downlink GPRS data transmission: maximum 85.6 kbps GPRS data uplink transmission: maximum 85.6 kbps Coding format：CS‐1，CS‐2，CS‐3 and CS‐4 Support PAP (cryptographic authentication protocol) protocols commonly used for PPP connections Embedded protocol：TCP/UDP/FTP/PPP and so on Temperature range ♦ ♦ Normal working temperature：‐40°C ~ +85°C storagetemperature：‐45°C ~ +90°C SMS Text and PDU modes SIM CARD INTERFACE SupportsSIM/USIM card：1.8V，3V Characteristic 50 Ω Audio interface Supports call, recording and playback function, can directly drive 8 ohm horn GPRS Data characteristics ♦ Full function serial port For AT command and GPRS data Adaptive baud rate：From 2400 bps to 921600 bps Debug serial port For software upgrade For software debugging Serial port ♦ Real time clock Real time clock Dimension 17.6×15.7×2.3mm Weight：1.25g Page9 Totally 57 pages Air208 Hardware Design Manual 3.1. Function Chart Following is Air208Functional block diagram，describing its main function： ♦ storage ♦ GSM RF ♦ Power Management ♦ Interface section — SIM card interface —Audio interface — UART interface — Power supply —RF interface — Boot and shutdown Chart 1：Functional block diagram Page10 Totally 57 pages Air208 Hardware Design Manual 3.2. Evaluation Board In order to help test and use Air208, Airm2m provides a set of evaluation boards. They includes Air208 module, EVB_Air208, UART to USB cable and so on. 4. Application interface The module uses LCC package, 42 SMT welding coil pins, and the following chapter details the functions of the following interfaces: ♦ power supply (refer to power supply section) ♦ Switch machine (refer to switch section) ♦ power saving technology (refer to power saving technology section) ♦ Serial port (refer to serial section) ♦ Audio interface(refer to audio section) ♦ SIM CARD INTERFACE(refer to SIM card section) Page11 Totally 57 pages Air208 Hardware Design Manual VBAT 34 GND 36 35 VBAT GND 37 38 ADC PWRKEY 39 40 VDDIO 41 NET_LED 42 STATUS 4.1. Pin description UART1_TXD 33 GND UART1_RXD 32 ANT UART1_RTS 31 GND UART1_CTS 30 GND UART1_DCD 29 GPIO_6 UART1_DTR UART1_RI GND 26 HOST_TXD MICP 25 HOST_RXD Air208 28 VRTC 27 GND MICN 10 24 CHG_DET UART2_RXD GND 21 RESET 20 GND 19 SIM_VDD 18 22 UART2_TXD SIM_RST 17 12 SIM_CLK 16 SPKN SIM_DAT 15 23 SIM_DET 14 11 GND 13 SPKP Chart 2：Pin arrangement (front view） Page12 Totally 57 pages Air208 Hardware Design Manual Table 3：Air208 Pin allocation Pin Pin name Input/Output Pin No. Pin name Input/Output UART1_TXD/GPIO_1 22 UART2_TXD/GPIO_5 UART1_RXD/GPIO_0 23 UART2_RXD/GPIO_4 UART1_RTS/GPIO_2 24 CHG_DET UART1_CTS/GPIO_3 25 HOST_RXD UART1_DCD/GPIO_31 26 HOST_TXD UART1_DTR/GPIO_29 27 GND UART1_RI/GPIO_30 28 GPIO_6 I/O GND 29 VRTC MICP 30 GND 10 MICN 31 GND 11 SPKP 32 ANT 12 SPKN 33 GND 13 GND 34 VBAT 14 SIM_DET/GPIO_7 35 VBAT 15 SIM_DAT I/O 36 GND 16 SIM_CLK I/O 37 GND 17 SIM_RST 38 ADC 18 SIM_VDD 39 PWRKEY 19 GND 40 VDDIO 20 RESET 41 NET_LED/GPIO_33 21 GND 42 STATUS/GPIO_11 I/O Page13 Totally 57 pages Air208 Hardware Design Manual Table 4：Pin descriptio ower Supply Pin name Pin No. I/O Pin description Electrical characteristics Remark VBAT 34 35 Module's main power supplyVBAT=3.4V~4.2 Vmax= 4.2V Vmin=3.4V Vnorm=3.8V The module has a maximum load current of 1.6A in burst mode 1.Hang when not in usage 2. If this pin is used for external power supply, VDDIO 41 Output 2.8V，10mA Vmax=2.95V it is recommended to shunt a 2~4.7uF decoupling capacitor, and the load current should not exceed 10mA 8 13 19 21 27 GND Module GND 30 31 33 36 Power button Pin name Pin no. I/O Pin description Electrical characteristics PWRKEY 39 Internal pull‐up, pull the pin lower than 1.5s module boot VILmax=0.4V 20 Hardware shutdown pin, active low。The module shutdown after pulldown more than 200ms Vmax= 1.5V Vmin=1.1V Vnorm=1.35V No external pull‐ups are required Pin name Pin no. Pin description Electrical characteristics Remark MICP MICN 10 Differential audio input SPKP SPKN 11 12 Differential audio output, you can directly drive the 8 ohm speaker I/O Pin description Electrical characteristics Remark RESET Remark Audio interface The main serial port Pin name Pin no. Page14 Totally 57 pages Air208 Hardware Design Manual UART1_TXD (GPIO_1) (SPI2_CS0) Module to send data UART1_RXD (GPIO_0) (SPI2_CLK) The module receives the data UART1_CTS (GPIO_3) (SPI2_DO) Clear send UART1_RTS (GPIO_2) (SPI2_CS1) The DTE requests to send data to the module UART1_DTR (GPIO_29) DTE is ready UART1_DCD (GPIO_31) Carrier detection (this pin represents the communication link) UART1_RI (GPIO_30) Module output ringing hint Pin name Pin no. I/O UART2_RXD (GPIO_4) (SPI2_DI) (LPG) 23 UART2_TXD (GPIO_5) (PWM) 22 Pin name Pin no. I/O HOST_RXD 25 VILmin=-0.3V VILmax=0.25×VDDIO VIHmin=0.75×VDDIO VIHmax=VDDIO+0.3 VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO RXD needs external 10K ohm resistor to pull to VDDIO. If communication is used only in TXD, RXD and GND, it is recommended that RTS be grounded through 10K ohm resistance; The module defaults to sleep and power saving. If you want to send AT instructions to the module during hibernation, you need to lower the DTR to wake up the module; If you do not want the module to go to sleep, you can ground the DTR through a 10K resistor. Other pins can be hang when is not in usage. Pin description Electrical characteristics Remark Hardeare UART2 VILmin=-0.3V VILmax=0.25×VDDIO VIHmin=0.75×VDDIO VIHmax=VDDIO+0.3 VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage Pin description Electrical characteristics Remark For software debugging and firmware download VILmin=-0.3V VILmax=0.25×VDDIO VIHmin=0.75×VDDIO VIHmax=VDDIO+0.3 VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage Pin description Electrical characteristics Remark The module automatically selects 1.8V or 3.0V SIM CARD INTERFACEIt is recommended to use TVS tube for ESD UART2 Debug serial port HOST_TXD 26 SIM CARD INTERFACE Pin name SIM_VDD Pin no. 18 I/O Power supply voltage of SIM card Page15 Totally 57 pages Air208 Hardware Design Manual 3V: VOLmax=0.36 SIM_RST SIM_DAT 17 15 I/O SIM card Reset SIM card data cable VOHmin=0.9×SIM_VDD 1.8V: VOLmax=0.2×SIM_VDD VOHmin=0.9×SIM_VDD 3V： VOLmax=0.4 VOHmin= SIM_VDD-0.4 1.8V： VOLmax=0.15×SIM_VDD VOHmin=SIM_VDD-0.4 3V： VOLmax=0.4 VOHmin=0.9×SIM_VDD 16 SIM card clock cable 14 SIM card in position detection VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage Pin name Pin no. I/O Pin description Electrical characteristics Remark ADC0 38 Analog to digital converter Input range 0~1.85V 10bit tolerance scope +—20mv Hang when not in usage Pin name Pin no. I/O Pin description Electrical characteristics Remark NET_LED (GPIO_33) (32K_OUT) 41 Network status indication VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage STATUS (GPIO_11) 42 Operating status detection VOHmin=0.85×VMMC VOLmax=0.15×VMMC Hang when not in usage GPIO_6 (UART2_RTS) (I2C_CLK) 29 I/O Reserved VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage Pin name Pin no. I/O Pin description Electrical characteristics Remark ANT 32 I/O GPRS RF signal input and output 50 ohm characteristic impedance SIM_CLK 1.8V： VOLmax=0.12×SIM_VDD VOHmin=0.9×SIM_VDD SIM_DET (GPIO_7) (UART2_CTS) (I2C_SDA) ADC GPIO Radio interface Page16 Totally 57 pages Table5：GPIO Configuration table Air208 GPIO PINNO. number Name. Power Pull‐ Domain Up Pull‐ At Reset After Reset Function0 Function1 Function2 Function3 Up/Down Resistor H/L/Hiz pull PinState H/L/Hiz pull PinState Function0 Type PULL ADDRESS Function1 Type PULL ADDRESS Function2 Type PULL ADDRESS Function3 Type PULL ADDRESS GPIO0 GPIO_0/UART1_RXD 2.8V, 166K UP INPUT UP INPUT GPIO_0 I/O UP 0x01A2A090(0x0) UART1_RXD UP 0x01A2A090(0x1) SPI2_CLK I/O UP 0x01A2A090(0x2) GPIO1 GPIO_1/UART1_TXD 2.8V, 166K DN INPUT DN INPUT GPIO_1 I/O DN 0x01A2A094(0x0) UART1_TXD OFF 0x01A2A094(0x1) SPI2_CS_0 I/O UP 0x01A2A094(0x2) GPIO2 GPIO_2/UART1_RTS 2.8V, 166K DN INPUT DN INPUT GPIO_2 I/O DN 0x01A2A098(0x0) UART1_RTS UP 0x01A2A098(0x1) SPI2_CS_1 I/O UP 0x01A2A098(0x2) PWL_1 OFF 0x01A2A098(0x3) GPIO_3 GPIO_3/UART1_CTS VDDIO 2.8V, 166K DN INPUT DN INPUT GPIO_3 I/O DN 0x01A2A09C(0x0) UART1_CTS OFF 0x01A2A09C(0x1) SPI2_DI_0 I/O DN 0x01A2A09C(0x2) LPSCO_1 OFF 0x01A2A09C(0x3) 23 GPIO_4 GPIO_4/UART2_RXD 2.8V 2.8V, 166K UP INPUT UP INPUT GPIO_4 I/O UP 0x01A2A0A0(0x0) UART2_RXD UP 0x01A2A0A0(0x1) SPI2_DI_1 UP 0x01A2A0A0(0x2) LPG UP 0x01A2A0A0(0x3) 22 GPIO_5 GPIO_5/UART2_TXD 2.8V, 166K DN INPUT DN INPUT GPIO_5 I/O DN 0x01A2A0A4(0x0) UART2_TXD OFF 0x01A2A0A4(0x1) LCD_TE DN 0x01A2A0A4(0x2) PWT OFF 0x01A2A0A4(0x3) 29 GPIO_6 GPIO_6/UART2_RTS/I2C3_SCL 2.8V, 33K DN INPUT DN INPUT GPIO_6 I/O DN 0x01A2A0A8(0x0) UART2_RTS UP 0x01A2A0A8(0x1) I2C3_SCL I/O UP 0x01A2A0A8(0x2) TCO_3 OFF 0x01A2A0A8(0x3) 14 GPIO_7 GPIO_7/UART2_CTS/I2C3_SDA 2.8V, 33K DN INPUT DN INPUT GPIO_7 I/O DN 0x01A2A0AC(0x0) UART2_CTS OFF 0x01A2A0AC(0x1) I2C3_SDA I/O UP 0x01A2A0AC(0x2) TCO_4 OFF 0x01A2A0AC(0x3) GPIO_8 SSD_CLK/SPI1_CLK 1.9V, 166K OFF OUTPUT 26MHz OFF OUTPUT SDMMC_CLK OFF 0x01A2A04C(0x0) GPIO_8 I/O DN 0x01A2A04C(0x1) SPI1_CLK I/O DN 0x01A2A04C(0x2) I2C1_SCL I/O UP 0x01A2A04C(0x3) GPIO_9 SSD_CMD/SPI1_CS0 1.9V, 50K UP INPUT UP INPUT SDMMC_CMD I/O UP 0x01A2A050(0x0) GPIO_9 I/O DN 0x01A2A050(0x1) SPI1_CS_0 I/O UP 0x01A2A050(0x2) I2C1_SDA I/O UP 0x01A2A050(0x3) GPIO_10 SSD_DATA0/SPI1_CS1 VMMC 1.9V, 50K UP INPUT UP INPUT SDMMC_DATA_0 I/O UP 0x01A2A054(0x0) GPIO_10 I/O DN 0x01A2A054(0x1) SPI1_CS_1 I/O UP 0x01A2A054(0x2) 42 GPIO_11 SSD_DATA1/SPI1_DI_O 1.8/1.9/2.0/2.6/2.8/3.0/3.3V 1.9V, 50K UP INPUT UP INPUT SDMMC_DATA_1 I/O UP 0x01A2A058(0x0) GPIO_11 I/O DN 0x01A2A058(0x1) SPI1_DI_0 I/O DN 0x01A2A058(0x2) GPIO_12 SSD_DATA2/SPI1_DI_1 1.9V, 50K UP INPUT UP INPUT SDMMC_DATA_2 I/O UP 0x01A2A05C(0x0) GPIO_12 I/O DN 0x01A2A05C(0x1) SPI1_DI_1 DN 0x01A2A05C(0x2) GPIO_13 SSD_DATA3 1.9V, 50K UP INPUT UP INPUT SDMMC_DATA_3 I/O UP 0x01A2A060(0x0) GPIO_13 I/O DN 0x01A2A060(0x1) GPIO_14 GPIO_14/I2S_BCK 1.9V, 166K OFF OUTPUT OFF OUTPUT LCD_RSTB OFF 0x01A2A064(0x0) GPIO_14 I/O DN 0x01A2A064(0x1) DAI_RST DN 0x01A2A064(0x2) I2S_BCK I/O DN 0x01A2A064(0x3) GPIO_15 GPIO_15/I2S_LRCK 1.9V, 166K OFF OUTPUT OFF OUTPUT SPI_LCD_CS OFF 0x01A2A068(0x0) GPIO_15 I/O DN 0x01A2A068(0x1) DAI_CLK OFF 0x01A2A068(0x2) I2S_LRCK I/O DN 0x01A2A068(0x3) 1.9V, 166K OFF OUTPUT OFF OUTPUT SPI_LCD_SCK OFF 0x01A2A06C(0x0) GPIO_16 I/O DN 0x01A2A06C(0x1) DAI_DI DN 0x01A2A06C(0x2) I2S_DI DN 0x01A2A06C(0x3) DAI_DO OFF 0x01A2A070(0x2) I2S_DO OFF 0x01A2A070(0x3) SPI_CAM_SSN I/O DN 0x01A2A08C(0x3) VLCD GPIO_16 GPIO_16/I2S_DI GPIO_17 GPIO_17/I2S_DO 1.9V, 166K DN OUTPUT DN OUTPUT SPI_LCD_DIO I/O DN 0x01A2A070(0x0) GPIO_17 I/O DN 0x01A2A070(0x1) GPIO_18 GPIO_18 1.9V, 166K OFF OUTPUT OFF OUTPUT SPI_LCD_SDC OFF 0x01A2A074(0x0) GPIO_18 I/O DN 0x01A2A074(0x1) GPIO_19 GPIO_19/I2C2_SCL 1.9V, 33K OFF OUTPUT OFF OUTPUT CAM_PWDN OFF 0x01A2A078(0x0) GPIO_19 I/O DN 0x01A2A078(0x1) I2C2_SCL I/O UP 0x01A2A078(0x2) GPIO_20 GPIO_20/I2C2_SDA 1.9V, 33K OFF OUTPUT OFF OUTPUT CAM_RSTB OFF 0x01A2A07C(0x0) GPIO_20 I/O DN 0x01A2A07C(0x1) I2C2_SDA I/O UP 0x01A2A07C(0x2) GPIO_21 GPIO_21 VCAM 1.9V, 166K OFF OUTPUT OFF OUTPUT CAM_CLK OFF 0x01A2A080(0x0) GPIO_21 I/O DN 0x01A2A080(0x1) GPIO_22 GPIO_22 1.8/2.8V 1.9V, 166K DN OUTPUT DN OUTPUT SPI_CAM_SCK I/O DN 0x01A2A084(0x0) GPIO_22 I/O DN 0x01A2A084(0x1) GPIO_23 GPIO_23 1.9V, 166K DN INPUT DN INPUT SPI_CAM_DI_0 DN 0x01A2A088(0x0) GPIO_23 I/O DN 0x01A2A088(0x1) SPI_CAM_DI_1 DN 0x01A2A088(0x2) GPIO_24 GPIO_24 1.9V, 166K DN INPUT DN INPUT SPI_CAM_DI_1 DN 0x01A2A08C(0x0) GPIO_24 I/O DN 0x01A2A08C(0x1) SPI_CAM_DI_0 DN 0x01A2A08C(0x2) GPIO_25 GPIO_25 2.8V, 166K DN INPUT DN INPUT KEYIN_0 DN 0x01A2A0B0(0x0) GPIO_25 I/O DN 0x01A2A0B0(0x1) GPIO_26 GPIO_26 2.8V, 166K DN INPUT DN INPUT KEYIN_1 DN 0x01A2A0B4(0x0) GPIO_26 I/O DN 0x01A2A0B4(0x1) GPIO_27 GPIO_27 2.8V, 166K DN INPUT DN INPUT KEYIN_2 DN 0x01A2A0B8(0x0) GPIO_27 I/O DN 0x01A2A0B8(0x1) GPIO_28 GPIO_28 2.8V, 166K DN INPUT DN INPUT KEYIN_3 DN 0x01A2A0BC(0x0) GPIO_28 I/O DN 0x01A2A0BC(0x1) GPIO_29 GPIO_29 VDDIO 2.8V, 166K DN INPUT DN INPUT KEYIN_4 DN 0x01A2A0C0(0x0) GPIO_29 I/O DN 0x01A2A0C0(0x1) GPIO_30 GPIO_30 2.8V 2.8V, 166K DN INPUT DN INPUT KEYOUT_0 I/O DN 0x01A2A0C4(0x0) GPIO_30 I/O DN 0x01A2A0C4(0x1) GPIO_31 GPIO_31 2.8V, 166K DN INPUT DN INPUT KEYOUT_1 I/O DN 0x01A2A0C8(0x0) GPIO_31 I/O DN 0x01A2A0C8(0x1) GPIO_32 GPIO_32 2.8V, 166K DN INPUT DN INPUT KEYOUT_2 I/O DN 0x01A2A0CC(0x0) GPIO_32 I/O DN 0x01A2A0CC(0x1) 41 GPIO_33 GPIO_33/32K_OUT 2.8V, 166K DN INPUT DN INPUT KEYOUT_3 I/O DN 0x01A2A0D0(0x0) GPIO_33 I/O DN 0x01A2A0D0(0x1) DBG_CLK(32Kclockout) OFF 0x01A2A0D0(0x5) GPIO_34 GPIO_34 2.8V, 166K DN INPUT DN INPUT KEYOUT_4 I/O DN 0x01A2A0D4(0x0) GPIO_34 I/O DN 0x01A2A0D4(0x1) HST_CLK DN 0x01A2A0D4(0x5) 25 GPIO_35 HST_RXD/GPIO_35 VDDIO 2.8V, 166K UP INPUT UP INPUT HST_RXD UP 0x01A2A0D8(0x0) GPIO_35 I/O DN 0x01A2A0D8(0x1) 26 GPIO_36 HST_TXD/GPIO_36 2.8V 2.8V 166K UP OUTPUT UP OUTPUT HST_TXD I/O UP 0x01A2A0DC(0x0) GPIO_36 I/O DN 0x01A2A0DC(0x1) 1.8/2.8V 4.2. Working mode The table below briefly describes the various modes of work mentioned in the next few chapters. Table 6：Work mode Mode Function GSM/GPRS SLEEP GSM IDLE If the DTR pin is high and there is no interrupt (for example, GPIO interrupt or serial data wake‐up interrupt), the module will automatically enter the sleep mode. Sleep mode, the module is still able to receive packets, short messages and calls. Software running normally. Module registration on GSM network, no data, voice and SMS interaction. GSM connection to work properly. Have data or voice or SMS interaction. In this GSM TALK mode, the power consumption of the module depends on the strength of the environmental signal, dynamic DTX control and the working frequency of the radio. Normal work GPRS IDLE GPRS STANDBY GPRS READY Module is not registered to GPRS network. Modules cannot be accessed through GPRS channels. The module registers on the GPRS network, but does not activate the PDP context (the module does not get the IP address). The PDP context is successfully activated (the module has acquired the IP address), but no data is transferred. In this state, the module can send or receive data. GPRS data transfer. In this mode, the power dissipation of the module depends on GPRS DATA the power control level, the working RF frequency band and the GPRS multi slot configuration. Shutdown mode By sending the "AT+CPOWD=1" command, using the PWRKEY pin or using "RESET" 1 "pins to achieve the normal shutdown. The Power Supply management chip turns off the baseband power supply and retains only the RTC power supply. The software is not running, the serial port can not access. Maintain VBATPower Supply power supply. Minimum function mode (keep power supply voltage) Without power down, the "AT+CFUN" command can be used to set the module into the least functional mode. In this mode, the radio doesn't work, or the SIM card doesn't work, or both of them don't work, but the serial port is still accessible. The power consumption is very low in this mode. Air208 Hardware Design Manual 4.3. Power Supply 4.3.1. Module power supply working characteristics Power Supply design is a very important part of GSM / GPRS module design. Since there is a burst of 577us (ie 1/8 TDMA cycle (4.615ms)) every 4.615ms when GSM is transmitting. During the burst phase, Power Supply must be able to provide high peak currents to ensure that the voltage does not drop to the module's minimum operating voltage. For the Air202 module, the peak current of the module will reach 1.6A at the maximum transmit power level, which will cause the VBAT terminal voltage to drop. In order to ensure stable and normal operation of the module, it is recommended that the maximum voltage drop at the module VBAT terminal should not exceed 400mV. Chart 3：Voltage and current waveforms of module emission 4.3.2. Reduce voltage drop Module's power supply VBAT input voltage range is 3.4V~4.2V, but in the RF module usually produces Power Supply voltage drop phenomenon in VBATPower Supply, this is due to the impedance of the Power Supply and routing path, is difficult to avoid. Therefore, special attention must be paid to the power supply design of the module to ensure that the VBAT voltage will not drop below 3.0V. When the voltage drops below 3.0V, the power‐down may be shut down or restarted. At the VBAT input, it is recommended to connect a 100uF tantalum capacitor with low ESR (ESR = 0.7Ω) and a 100nF, 33pF, 10pF filter capacitor (0603 package) in parallel with the VBAT input reference circuit. And recommend that VBAT PCB traces as short and wide enough, the equivalent impedance decreases VBAT line, ensuring the maximum transmit power at high current will not produce too big voltage drop, voltage drop generally controlled within 400mV. Recommended VBAT alignment width of not less than 2mm, and the longer the alignment, the wider the line width. Note: The module's hardware shutdown voltage is 3.0V. Page19 Totally 57 pages Air208 Hardware Design Manual Chart 4：VBAT INPUT REFERENCE CIRCUIT 4.3.3. Power supply reference circuit The power supply design is crucial to the power supply to the module and must be selected with Power Supply capable of delivering at least 2A current capability. If the input voltage and the voltage difference between the supply voltage of the module is not very large, it is recommended to select the LDO as the Power Supply Supply. If there is a large pressure difference between the input and output, then use the switch Power Supply converter. LDO power supply： The following figure is +5V Reference design powered by Micrel's LDO, model MIC29302WU. Its output voltage is 4.16V, and the peak load current is 3A. In order to ensure the stability of the output Power Supply, it is recommended to reserve a voltage regulator at the output terminal, and close to the module VBAT pin. It is suggested that the voltage regulator with reverse breakdown voltage of 5.1V and dissipation power of more than 1W is selected. Page20 Totally 57 pages Air208 Hardware Design Manual Chart 5：Power Input Reference Design DC-DC power supply： Below is the DCDC Power Supply Reference design switch, the JW5033H switch is Power Supply chip Jiehuate company, its maximum output current at 2A, while the input voltage range. Note that the selection of C25 depends on the input voltage to select the withstand voltage. Chart 6：DCDCPower Input Reference Design 4.4. Boot and shutdown 4.4.1. Boot Air208 module can be powered on via the PWRKEY pin. The off state long press the power button above 2S module will enter the boot process, the software will detect the VBAT pin voltage if VBAT pin voltage is greater than the software set the boot voltage (default 3.55V), will continue to boot up until the system boot is complete; otherwise, will stop the execution of the boot operation, the system will shut down. By default, the AT command version is adaptive baud rate (AT + IPR = 0). In adaptive baud rate mode, the boot initialization message "RDY" will not be sent back to the master. After the module is powered on, you can send an AT command to the module to train the baud rate to be the same as the master. The master needs to send the "at" character to the module to train it (be careful to lower the "at"). Generally send a at the baud rate can be trained over, the module will be reported initialization information. Since then you can use the normal AT command, uppercase and lowercase can be. 4.4.1.1 PWRKEY Pin boot After VBAT is powered on, the PWRKEY pin can start the module. After PWRKEY pin is pulled low for 2s, the PWRKEY pin can be released. You can determine whether the module is powered on by detecting the level of the Page21 Totally 57 pages Air208 Hardware Design Manual VDDIO pin. It is recommended to use an open collector driver to control the PWRKEY pin. The picture below is Reference circuit： Chart 6：Open set driver reference boot circuit Another way to control the PWRKEY pin is to use a button switch directly. A TVS should be placed near the button to protect the ESD.The picture below is Reference circuit： Chart 7：Button bootReference circuit 4.4.2. Shutdown The following ways can shut down the module： ♦ Normal shutdown: Use the PWRKEY pin to shut down. ♦ Low‐voltage automatic shutdown: shutdown when the module detects low voltage. ♦ Emergency shutdown: shut down by RESET pin. ♦ AT command shutdown. Page22 Totally 57 pages Air208 Hardware Design Manual 4.4.2.1 PWRKEY Pin shutdown When the PWRKEY pin is pulled down for more than 2S, the module will perform shutdown operation. During the shutdown process, the module needs to log off the GSM network. The logout time is related to the current network status. The measured time is about 2s ~ 12s. Therefore, it is recommended to extend the system by 12s before powering off or restarting, so as to ensure that the software to save important data before complete power‐off. 4.4.2.2 Low voltage automatic shutdown When the module is in running state When the VBAT pin voltage is lower than the software set shutdown voltage (the default setting is 3.0V), the software will shut down the module to prevent various abnormal running under the condition of low voltage. 4.4.2.3 AT command shutdown The user can close the module with "AT + CPOWD = 1". After the module is shut down, the module enters shutdown mode and no further AT commands can be executed. Power-down mode can be used to indicate VDDIO pin, low indicates that the module has entered shutdown mode 4.4.2.4 RESET mergency shutdown The thirty‐fourth pin of Air208 module is reset pin, and its function is hardware shutdown. It can be shutdown by pulling down the RESET pin 200ms or so. The OC driver circuit is recommended to control the RESET pin. The picture below is Reference circuit： Chart 8：Open driver reference emergency shutdown circuit Page23 Totally 57 pages Air208 Hardware Design Manual Another way to control the RESET pin for emergency shutdown is to use a pushbutton switch directly. Place a TVS tube near the button for ESD protection. The picture below is Reference circuit： Chart 9：Button emergency shutdownReference circuit 4.5. Power saving technology According to the system requirements, there are two ways to make the module into a low power state. For the AT version, the "AT+CFUN" command enables the module to enter the least functional state. 4.5.1. Least functional mode Minimal function mode can minimize the module function, this mode can be set by sending "AT + CFUN =" command. parameters can choose 0,1,4 ♦ 0：Minimum function (turn off RF and SIM card)； ♦ 1：Full function (default)； ♦ 4：Turn off the RF sending and receiving functions； If the module is set to the least functional mode with "AT + CFUN = 0", the functions of the radio section and the SIM card section will be switched off. The serial port is still valid, but the RF part and the SIM card part related to the AT command is not available. If the module is set using "AT + CFUN = 4", the RF section will be turned off and the serial port will still be active. All RF commands related to the RF section are not available. After the module is set by "AT + CFUN = 0" or "AT + CFUN = 4", the module can be returned to the full function by the "AT + CFUN = 1". 4.5.2. Sleep Mode (Slow Clock Mode） Air202 Supports sleep mode. For AT version, the sleep mode is controlled by the DTR pin. When DTR is high level, the module is allowed to sleep. When DTR is high, the module enters sleep mode at about 30s when no action is taken. DTR is high level When the module goes low, the module wakes up. At the same time, the AT command can be woken up continuously by the main serial port, but some AT commands will be lost. Page24 Totally 57 pages Air208 Hardware Design Manual 4.5.3. ♦ ♦ ♦ Sleep wake When the module is in sleep mode, the following method can wake up the module. The AT version pulls the DTR pin down and wakes the module. The 20ms port is activated after the DTR pin is pulled down Receive calls or GPRS data to wake up the module. Receive SMS to wake up module. 4.6. Mode switching summary Table 7：Mode switching summary Current mode Next mode Shutdown Shutdown Normal mode Sleep mode Normal mode Sleep mode Use PWRKEY boot Use the PWRKEY pin, or use the Software call sleep interface, AT RESET pin, or the VBAT voltage is version does not do action for lower than the shutdown voltage 30s it will sleep automatically Use PWRKEY or RESET pin or VBAT GPIO pin interrupt, timer, receive voltage is lower than shutdown SMS or GPRS data voltage 4.7. Serial port The module provides two general asynchronous transceivers: the main serial port UART1 and the auxiliary serial port UART2. Module Supports fixed baud rate and adaptive baud rate. Adaptive baud rate Supports range 4800bps to 115200bps. Main serial port ♦ UART1_TXD：Send data to the RXD end of the DTE device ♦ UART1_RXD：Receive data from the TXD end of the DTE device ♦ UART1_RTS：The DTE requests to send data to DCE ♦ UART1_CTS：Clear send ♦ UART1_DTR：DTE is ready and notify DCE (this pin can be used to wake up the module） ♦ UART1_RI：Ringing (DCE has incoming call or URC or short message will send signal to notify DTE） ♦ UART1_DCD：Carrier detection (when the communication link between DCE and DTE is established） Page25 Totally 57 pages Air208 Hardware Design Manual ♦ By default, the hardware flow control of the module is closed. When the client needs hardware flow control, pins RTS, CTS must be connected to the client, and the AT command "AT+IFC=2,2" can be used to open the hardware flow control. The AT command "AT+IFC=0,0" can be used to shut down the flow control. Please refer to document [AT]） Auxiliary serial port UART2 ♦ ♦ ♦ UART2_TXD：Send data to the serial port of DTE UART2_RXD：Receive data from serial port of DTE Serial logic level is shown as the following table： Table8：Serial logic level Parameter Minimum value Maximum value Unit VIL 0.25×VDDIO VIH 0.75×VDDIO VDDIO +0.3 VOL 0.15×VDDIO VOH 0.85×VDDIO VDDIO Table 9：Definition of serial port pins Interface Name pin Function UART1_DTR 12 DTE is ready UART1_TXD Send data by serial port UART1_RXD Serial port receives data UART1_CTS Clear send UART1_RTS DTE requests to send data UART1_DCD 10 Carrier detection UART1_RI 11 Ringing indication Auxiliary serial port UART2_RXD 27 Serial port receives data UART2 UART2_TXD 28 Serial port sends data Main serial port UART1 Page26 Totally 57 pages Air208 Hardware Design Manual 4.7.1. Main serial port 4.7.1.1 Main serial port features ♦ ♦ ♦ ♦ ♦ ♦ It includes data line TXD and RXD, hardware flow control line RTS and CTS, other control lines DTR, DCD and RI. 8 data bits, no parity, a stop bit. Hardware flow control is turned off by default。 To send AT commands, GPRS data transmission, CSD fax and so on. Supports baud rate as follows: 1200,2400,4800,9600,14400,19200,28800,38400,57600,115200,230400,460800,921600 AT command version By default, the module is adaptive baud rate (AT + IPR = 0). In adaptive baud rate mode, initialization information (beginning with "RDY") will not be sent back to the master after booting. 2‐3 seconds after the module is powered on, AT commands can be sent to the module. The host computer needs to send the "AT" character to the module to train the baud rate of the host computer first. At this moment, the module will report the initialization information indicating that the training is successful. The user can send an "AT + IPR = x: & W" command to the module (x is the baud rate, such as 9600). The function of this command is to set a fixed baud rate and save it. After completing these configurations, Module boot, the serial port will automatically return URC initialization information (beginning with "RDY"）。 Synchronization between the module and the host computer： ： When the module is powered on with adaptive baud rate turned on, it is best to wait 2 ~ 3 seconds before sending "AT" character. When the module reports the initialization information, it indicates that the training of baud rate is successful and the synchronization is completed with the host computer. In adaptive baud rate mode, the master must first synchronize if it needs a power‐on message. Otherwise, the initialization information will be omitted： ♦ ♦ ♦ ♦ ♦ ♦ Serial port configuration is 8 data bits, no parity, 1 stop bit (factory configuration） Only the string "AT" when the module is switched on can train the baud rate. ("At", "At" or "aT" can not be recognized）. Baud rate training is successful, you can identify the uppercase, lowercase or uppercase and lowercase AT command combination. In adaptive baud rate mode, URC information such as "RDY", "+ CFUN: 1" and "+ CPIN: READY" will not be reported if the module is powered on without synchronization. It is not recommended to switch to adaptive baud rate mode when fixed baud rate mode. In adaptive baud rate mode, it is not recommended to switch to software multiplex mode 4.7.1.2 Main serial port connection mode Main serial portThe main serial port connection mode is more flexible, as follows are three commonly used connection mode. Full‐featured serial port in accordance with the following connection, this mode is mainly used in modem mode (PPP dial‐up). Page27 Totally 57 pages Air208 Hardware Design Manual Chart 10：Full‐featured serial port connection diagram Please refer to the following connection mode for three wire serial port： Chart 11：Serial three‐wire connection diagram Please refer to the following circuit connection with flow control serial port connection, this connection can increase the reliability of large amounts of data transmission, to prevent data loss. Page28 Totally 57 pages Air208 Hardware Design Manual Chart 12：Schematic diagram of serial connection mode with flow control 4.7.2. ♦ ♦ ♦ Debug serial port Data cable：HOST_TXD and HOST_RXD Debug port is for software debugging only, baud rate is configured to 921600bps The serial port will automatically output log information to the outside Please refer to following ways to debug serial port connection： Chart 13：Software debugging connection diagram Page29 Totally 57 pages Air208 Hardware Design Manual 4.7.3. Serial port application For the 3.3V voltage system in the case of the serial port level matching circuit reference is as follows, it is strongly recommended to use RXD modules such as the input port on the resistor divider, the voltage is divided to 2.8V. If it is 3V system, according to the principle of partial pressure, it is recommended to change the 5.6K resistance to the 10K resistor. It is also suggested that 1K resistors must be connected in series when customers don't allow partial pressure. Chart 14：3.3V Level conversion circuit 5V system level matching, level matching between the module and peripherals can refer to the following connections, the dotted line below can refer to the above solid line circuit (the dotted line module to send the reference module TXD circuit design, the dotted line module Receive reference module RXD circuit design). VCC_MCU is the client's I / O voltage level. VDDIO is the module output I / O voltage level. Page30 Totally 57 pages Air208 Hardware Design Manual Chart 15：5VLevel conversion circuit When the module communicates with the PC, you need to add an RS232Level conversion circuit between them. Because the module's serial port configuration is not RS232 level, only SupportsCMOS level. The following figure shows the module with PC communication, serial port level conversion circuit. Chart 16：RS232 Level conversion circuit Page31 Totally 57 pages Air208 Hardware Design Manual 4.8. Audio interface The module provides an analog audio input channel and a channel analog output channel, Supports call, recording and playback functions。 Table10：Audio interfacePin definition Interface Interface name Interface no. Function MICP Audio input positive end MICN 10 Audio input negative end SPKP 11 Audio output positive end SPKN 12 Audio output negative end AIN AOUT AIN can be used as a microphone input or an analog audio signal input. Microphones usually use electret microphones. AIN1 is a differential input. AOUT channels can directly drive 8 ohm speakers. The AOUT channel is differential output. 4.8.1. Preventing TDD noise and other noises As for handheld speakerphone and handsfree microphones It is recommended to use a built‐in RF filter dual capacitor (such as 10pF and 33pF) electret microphone to filter out radio frequency interference from the interference source will greatly improve the coupling TDD noise. The 33pF capacitor is used to filter out high‐frequency interference when the module is operating at 900MHz. If you do not add this capacitor, you may hear TDD noise during the call. At the same time 10pF capacitor is used to filter out the work in the 1800MHz frequency high frequency interference. It should be noted that, because the capacitance of the resonance point depends largely on the material of the capacitor and the manufacturing process, so the choice of capacitor, you need to consult the capacitor suppliers, select the most suitable value to filter out work in GSM900MHz, High frequency noise at DCS1800MHz. The severity of high frequency interference at GSM transmission usually depends mainly on the customer application design. In some cases, GSM900 TDD noise is more serious, and in some cases, DCS1800 TDD noise is more serious. Therefore, customers can filter the results of the election according to the needs of the filter capacitor, and sometimes do not need to paste this type of filter capacitor. PCB RF filter capacitor placed on the position as close as possible to Audio devices or Audio interface, alignment as short as possible, to go through the filter capacitor and then to other points. Position the antenna away from the Audio component and the Audio traces as far as possible to reduce radiated interference. The Power Supply traces should not be parallel to the Audio traces. The Power Supply traces should be as far away as possible from the Audio lines. Differential Audio traces must follow the Layout rules for differential signals. Page32 Totally 57 pages Air208 Hardware Design Manual 4.8.2. Microphone interface reference circuit AIN channel built‐in electret microphone bias voltage. Microphone channel reference circuit shown below： Chart 17：AIN MICROPHONE CHANNEL INTERFACE CIRCUIT 4.8.3. Audio output interface reference circuit SPKAudio Output Interface can be directly driven with 8 ohm speaker. Chart 18：Reference line Page33 Totally 57 pages Air208 Hardware Design Manual 4.8.4. Audio Electrical characteristics Table 11：Typical characteristics of electret microphones Parameter Minimum Typical Maximum Unit Working voltage 1.0 1.25 2.0 500 Ma Working current Impedance 2.2 KΩ Table 12：Audio interfaceTypical characteristic parameters Parameter Minimum Single‐ended output Load Differential output Load AOUT Reference level Reference level Typical Maximum Ω 2.4 Unit Vpp Ω 4.8 Vpp Page34 Totally 57 pages Air208 Hardware Design Manual 4.9. SIM CARD INTERFACE The SIM card interface supports the functions of the GSM Phase1 specification, as well as the functions of the GSM Phase 2+ specification and the FAST64 kbps SIM card (used in the SIM application toolkit). The SIM card is powered by the internal power supply of the module to support 1.8V and 3.0V power supply. 4.9.1. SIM INTERFACE The following table describes the SIM interface pin definitions. Table13：SIM CARD INTERFACEPin definition Pin name Pin no. Function SIM_VDD 18 SIM card power supply automatic detects SIM card operating voltage. The accuracy is 3.0V ± 10% and 1.8V ± 10%. The maximum supply current is 10mA. SIM_RST 17 SIM card Reset pin SIM_DATA 15 SIM card data cable SIM_CLK 16 SIM card clock line SIM_DET 14 SIM card in position detection The figure below is the reference circuit SIM interface, using of 6pin SIM card connector. Chart 19：Using a 6pin SIM Card Reference Schematic (SIM) Page35 Totally 57 pages Air208 Hardware Design Manual If you need to use sim card in place detection, the recommended circuit is as follows. Chart 20：With the detection of PIN SIM card reference circuit diagram In SIM CARD INTERFACE circuit design, in order to ensure the SIM card's good functional performance and is not damaged, the circuit design is recommended to follow the following design principles： ♦ SIM card holder and the module can not be too far away from the ornaments, the closer the better, try to ensure that SIM card signal cable is not exceed 20cm. ♦ The SIM card signal cable is routed away from the RF cable and the VBAT power cable. ♦ The wiring width of SIM_VDD is not less than 0.3mm and the bypass circuit between SIM_VDD and SIM_GND should not exceed 1uF and be placed close to the SIM card holder. ♦ In order to prevent possible SIM_CLK signal crosstalk on the SIM_DATA signal, the two wiring should not be too close, increase the shielding between the two traces. And SIM_RST signal also needs protection. ♦ In order to ensure good ESD protection, it is recommended to add TVS tube, and placed near SIMcassette. The selected ESD device has a parasitic capacitance of no more than 50pF, such as WILL (http://www.willsemi.com) ESDA6V8AV6. A 22 ohm resistor can be connected in series between the module and the SIM card to suppress stray EMI and enhance ESD protection. The SIM card's peripheral circuitry must be as close as possible to SIMcassette. 4.9.2. 6-pin SIM card holder Using a 6‐pin SIM card holder, Amphenol's C70710M0065122 is recommended. Visit http://www.amphenol.com for more information. Page36 Totally 57 pages Air208 Hardware Design Manual Chart 21：Amphenol C707 10M006 512 2 SIM cassette Page37 Totally 57 pages Air208 Hardware Design Manual 4.10. RI SIGNAL ACTION Table 14：RI SIGNAL ACTION Status RI response Standby High level Voice call Data transmission After switching to low level： （1） When the call is switched on to a high level （2） Use the AT command ATH hang up the voice, RI goes high （3） The caller hangs up, RI first goes high, then pulls low for 120ms, receives an auto‐reply URC message "NO CARRIER" and then goes high （4） When SMS is received, it becomes high level After switching to low level： （1） It changes to high level when data connection is set up. （2） Use the AT command ATH to suspend data connections, and RI to a high level （3） The caller hangs up, RI first into high level, then pull to a low level for 120ms, received automatic reply message "NO URC CARRIER", and then into high level （4） When SMS is received, it becomes high level SMS When a new message is received, RI goes low for 120ms and then goes high. URC Some URC information can trigger RI to pull low 120ms If the module is used as a calling party, the RI remains high except when receiving URC messages or text messages. When the module is used as the called party, the timing of RI is as follows： Chart 22：The module is used as called party RI timing for voice call Page38 Totally 57 pages Air208 Hardware Design Manual Chart 23：The module is used as called party RI timing for data call Chart 24：RI timing of module calling Chart 25：RI timing when receiving URC message or SMS Page39 Totally 57 pages Air208 Hardware Design Manual 4.11. Network status indication NET_LEDpin signal can be used to indicate the status of the network lights. The working status of this pin is shown in the following table： Table 15：NET_LED working status Status Module function Shutdown The module is not running Bright 64ms，off 800ms Can not find the network Bright 64ms，off 3000ms Registered on network Bright 64ms，off 300ms GPRS cimmunication not registered on the GSM network： Chart 26：NETLIGHTReference circuit Page40 Totally 57 pages Air208 Hardware Design Manual 4.12. PWM Air208supports 2 PWM outputs: PWM, LPG, multiplexed by UART2_RX and UART2_TXD respectivel. UART2 Pin name Pin no. I/O UART2_RXD (LPG) 23 UART2_TXD (PWM) 22 Pin description Electrical characteristics Remark Hardware UART2 VILmin=-0.3V VILmax=0.25×VDDIO VIHmin=0.75×VDDIO VIHmax=VDDIO+0.3 VOHmin=0.85×VDDIO VOLmax=0.15×VDDIO Hang when not in usage LPG (Light Pulse Generation) For low frequency applications such as driving LED flashes, only a fixed seven kinds of cycle (Unitms) can be set: 125,250,500,1000,1500,2000,2500,3000. And 15 kinds of high time. PWM, frequency range (80‐65535HZ), and various duty cycles can be set. Please refer to the corresponding AT command document. 5. Radio interface pin 32 is the RF antenna input. RFInterface50 ohm impedance matching. Table 16：RF_ANTPin definition Pin name Pin no. Function RF_ANT 32 RF pad Page41 Totally 57 pages Air208 Hardware Design Manual 5.1. RF reference circuit Chart 27：RF reference circuit Air208 pads must be microstrip or other types of RF traces and the impedance must be controlled to about 50 ohms. For better RF performance, ground pads are on each side of the RF input port. Care must be taken to minimize the losses on the RF traces or RF cables. The recommended insertion loss must meet the following conditions： ♦ EGSM850<1dB ♦ DCS1900<1.5dB Air208 also built an RF connector to facilitate users to directly connect the module RF coaxial antenna, and save the board on the RF routing： Page42 Totally 57 pages Air208 Hardware Design Manual Page43 Totally 57 pages Air208 Hardware Design Manual Corresponding coaxial connector as shown below： 5.2. RF CONDUCTION SENSITIVITY Table 18：RF CONDUCTION SENSITIVITY Band Receiving sensitivity EGSM850 < -108.5dBm DCS1900 < -108.5dBm Page44 Totally 57 pages Air208 Hardware Design Manual 5.3. Recommended RF welding method If the RF connector for connecting the external antenna is connected to the module by soldering, be sure to pay attention to the stripping method and soldering method of the connecting wire. In particular, if the soldering is sufficient, follow the correct soldering method shown in the figure below, In order to avoid due to poor welding caused by line loss increases. Chart 28：Suggestion on RF welding method Page45 Totally 57 pages Air208 Hardware Design Manual 6. Electrical characteristics, reliability, RF characteristics 6.1. Absolute Maximum The following table shows the module digital, analog pin Power Supply supply voltage and current Maximum tolerance value. Table20：Absolute Maximum Parameter Minimum Maximum Unit VBAT ‐0.3 4.2 Power supply peak current Power supply average current (TDMA one 0.7 Digital pin voltage ‐0.3 3.3 Analog pin voltage ‐0.3 3.0 Off / Off mode digital / analog pin voltage ‐0.25 0.25 frame time) 6.2. working temperature Table 21：working temperature Temperature Minimum Typical Maximum Unit Nornal working temperature ‐40 25 85 ℃ storagetemperature ‐45 90 ℃ Page46 Totally 57 pages Air208 Hardware Design Manual 6.3. Voltage limit value Table 22：Module power limit value Paramet Description Condition Minimum Typical Maximum Unit Supply voltage The voltage must be within this range, including voltage drops, ripple, and spikes 3.4 3.8 4.2 Burst voltage GSM900 MaximumTransmit 400 mV drop at launch power level VBAT Shutdown mode Power on for the first time 34 Shutdown after boot(RTC works normally) 101 Flight Mode IVBAT Average supply current mA DRX=2 1.4 mA DRX=5 1.14 mA DRX=9 1.03 mA 0.896 mA AT+CFUN=0 (2 send，2 receive) GPRS mose (4 receive，1 send) Peak current / GSM900 transmit AT+CFUN=4 Minimum function mode GPRS mode mA 0.763 EGSM 900 1) 315.9 mA DCS1800 2) 208.7 mA EGSM 900 1) 203.5 mA DCS1800 2) 150.1 mA GSM900 MaximumTransmit power level uA 0.8 Bottom current Standby current uA 1.8 Page47 Totally 57 pages Air208 Hardware Design Manual time slot) 1) 1) power level 5 2) power level 0 Page48 Totally 57 pages Air208 Hardware Design Manual 6.4. Current consumption Table 23：Module's current consumption Condition Current consumption GPRS data transmission Data transmission mode, GPRS ( 2 receive, 2 send) CLASS8 & CLASS 12 EGSM850 @Power level5，<550mA，Typicalvalue 315.9mA @Power level10，Typicalvalue 158.2mA @Power level19，Typicalvalue 83.5mA DCS1900 @Power level0，<450mA，Typicalvalue208.7mA @Power level5，Typicalvalue125mA @Power level15，Typicalvalue78.4mA Data transfer mode, GPRS ( 4 receive, 1send) CLASS8 & CLASS 12 EGSM850 DCS1900 @Power level5，<350mA，Typicalvalue203.5mA @Power level10，Typicalvalue101.3mA @Power level19，Typicalvalue62.4mA @Power level0，<300mA，Typicalvalue150.1mA @Power level5，Typicalvalue79.4mA @Power level15，Typicalvalue55.8mA Page49 Totally 57 pages Air208 Hardware Design Manual 6.5. Static Protection In the module application, due to the human body static electricity, static electricity generated between the microelectronic electrostatic friction, through various means of discharge to the module, may cause some damage to the module, so ESD protection must pay attention to, whether in the production assembly, testing , R & D process, especially in product design, should take ESD protection measures. For example ESD protection should be added in circuit design at the Interface or vulnerable to ESD point. To wear anti‐ESD gloves in production and so on. The following table shows the ESD withstand voltage of the module PIN pin. Table 24：ESDP erformance parameters (temperature: 25 C, humidity: 45%)） Pin name Contact discharge Air discharge VBAT,GND ±5KV ±10KV RF_ANT ±5KV ±10KV TXD, RXD ±2KV ±4KV Others ±0.5KV ±1KV Page50 Totally 57 pages Air208 Hardware Design Manual 7. phycial dimension This section describes the module's phycial dimension and the recommended package dimensions for the customer's design using the module. Page51 Totally 57 pages Air208 Hardware Design Manual 7.1. Module phycial dimension Chart 29：Air208 Front view (unit: mm） Page52 Totally 57 pages Air208 Hardware Design Manual 7.2. Recommended PCB encapsulation Chart 30：Recommended encapsulation (Unit: mm) Note: make sure the spacing between module on the PCB and other components is 3mm at least. Page53 Totally 57 pages Air208 Hardware Design Manual 7.3. Module front view Chart 31：Module front view Page54 Totally 57 pages Air208 Hardware Design Manual 7.4. Module bottom view Chart 32：Module bottom view 8. Storage and production 8.1. Storage Air208 shipped in vacuum sealed bags. The storage of the module needs to follow the following conditions： The module can be stored in a vacuum‐sealed bag for 12 months at ambient temperatures below 40 ° C and air humidity less than 90%. When the vacuum sealed bags open, if the following conditions are met, the module can be directly reflow or other high‐temperature processes： ♦ Module ambient temperature below 30 degrees Celsius, air humidity less than 60%, the factory completed patch within 72 hours. Air humidity is less than 10%. Page55 Totally 57 pages Air208 Hardware Design Manual ♦ ♦ If the module is in the following conditions, it is necessary to bake before the patch： When the ambient temperature is 23 degrees Celsius (5 degrees Celsius allowed fluctuations), the humidity indicator shows humidity greater than 10% When the vacuum sealed bag is opened, the module ambient temperature is below 30 degrees Celsius and the air humidity is less than 60%, but the factory failed to complete the patch within 72 hours When the vacuum sealed bag is opened, the module storage air humidity is greater than 10%. If the module needs to be baked, please bake for 48 hours at 125 degrees Celsius (allowing 5 degrees Celsius fluctuation). Note: The module packaging can not withstand such a high temperature, remove the module package before the module is baked. If you only need a short baking time, please refer to the IPC / JEDECJ‐STD‐033 specification. 8.2. Production welding Printed scraper on the screen printing solder paste, solder paste through the screen openings to the PCB on the leakage, printing scraper strength needs to be adjusted properly, in order to ensure the quality of module paste, Air202 module pad part of the corresponding stencil thickness should be 0.2mm. Chart 33：Paste map To avoid repeated heating damage to the module, it is recommended that the customer PCB board be reflowed after the first side of the module. The recommended Furnace temperature curve is shown below： Page56 Totally 57 pages Air208 Hardware Design Manual Chart 34：Furnace temperature curve FCC Statement Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 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. FCC 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. FCC Label Instructions The outside of final products that contains this module device must display a label referring to the enclosed module. This exterior label can use wording such as: "Contains Transmitter Module FCC ID: 2AEGG-AIR208 or “Contains FCC ID:2AEGG-AIR208 , Any similar wording that expresses the same meaning may be used. Page57 Totally 57 pages
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