Qisda GM6601 Module kits User Manual

Qisda Corporation Module kits

User Manual

Copyright © 2011 Qisda Corporation. Confidential Property M66 Design Guide M66 GSM / GPRS Wireless Module Design Guide Rev. 0.0.1 2011/6/10 Copyright © 2008 Qisda Corporation. All rights reserved. This document contains proprietary technical information which is the property of Qisda Corporation and is issued in strict confidential and shall not be disclosed to others parties in whole or in parts without written permission of Qisda Corporation. The documents contain information on a product, which is under development and is issued for customer evaluation purposes only. Qisda may make changes to product specifications at any time, without notice. Module Business Division Mobile Communications BU Qisda Corporation 18 Jihu Road, Nei-Hu, Taipei 114, Taiwan Tel: +886-2-2799-8800 Fax: +886-2-2656-6398 http://Qisda.com
Version: 0.0.1 - 2 - 2011/6/10 M66 Design Guide History Version Date Notes VER: 0.0.1 2011/6/10 First release
Version: 0.0.1 - 3 - 2011/6/10 M66 Design Guide FCC Regulations: 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 device 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 radiated 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 on, the user is encouraged to try to correct the interference by one or more 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. Changes or modifications not expressly approved by the party responsible for compliance could void the user‘s authority to operate the equipment. RF Exposure Information This Modular Approval is limited to OEM installation for mobile and fixed applications only. The antenna installation and operating configurations of this transmitter, including any applicable source-based time-averaging duty factor, antenna gain and cable loss must satisfy MPE categorical Exclusion Requirements of §2.1091. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons, must not be collocated or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures.
Version: 0.0.1 - 4 - 2011/6/10 M66 Design Guide The end user has no manual instructions to remove or install the device and a separate approval is required for all other operating configurations, including portable configurations with respect to 2.1093 and different antenna configurations. Maximum antenna gain allowed for use with this device is 2 dBi. When the module is installed in the host device, the FCC ID label must be visible through a window on the final device or it must be visible when an access panel, door or cover is easily re-moved. If not, a second label must be placed on the outside of the final device that contains the following text: “Contains FCC ID: VRSGM6601”.
Version: 0.0.1 - 5 - 2011/6/10 M66 Design Guide IC Regulations: This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada. This Category II radio communication device complies with Industry Canada Standard RSS-310. Ce dispositif de radiocommunication de catégorie II respecte la norme CNR-310 d’Industrie Canada. IMPORTANT NOTE: IC Radiation Exposure Statement: This equipment complies with IC RSS-102 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.
Version: 0.0.1 - 6 - 2011/6/10 M66 Design Guide Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Labeling Requirements for the Host Device (from Section 3.2.1, RSS-Gen, Issue 3, December 2010): The host device shall be properly labeled to identify the module within the host device. The Industry Canada certification label of a module shall be clearly visible at all times when installed in the host device, otherwise the host device must be labeled to display the Industry Canada certification number of the module, preceded by the words “Contains transmitter module”, or the word “Contains”, or similar wording expressing the same meaning, as follows: Contains transmitter module IC: 8729A-GM6601 This radio transmitter (identify the device by certification number, or model number if Category II) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Version: 0.0.1 - 7 - 2011/6/10 M66 Design Guide Index 1 POWER-ON / POWER-DOWN SEQUENCE .................................................................................... 9 1.1 POWER-ON SEQUENCE ........................................................................................................................... 9 1.2 SWITCHED ON ..................................................................................................................................... 10 1.3 M66 RESTARTS ...................................................................................................................................... 10 1.4 M66 SWITCH OFF .................................................................................................................................. 11 2 INITIALIZATION PROCEDURE ........................................................................................................ 12 3 SHORT MESSAGE .................................................................................................................................. 14 3.1 INITIALIZATION .................................................................................................................................... 14 3.2 SENDING A SMS ................................................................................................................................... 14 3.3 RECEIVING A SMS ................................................................................................................................. 15 4 VOICE CALL ............................................................................................................................................ 16 4.1 INITIALIZATION .................................................................................................................................... 16 4.2 MOBILE ORIGINATED CALL (MO) ......................................................................................................... 17 4.3 MOBILE TERMINATED CALL (MT) ........................................................................................................... 17 5 PPP DATA CALL ..................................................................................................................................... 18 5.1 GET READY FOR PPP DATA CALL............................................................................................................ 18 5.2 DIALING .............................................................................................................................................. 18 6 M2M ............................................................................................................................................................ 19 7 M66 INTERFACE .................................................................................................................................... 20 7.1 POWER ................................................................................................................................................ 21 7.2 UART.................................................................................................................................................. 23 7.3 AUDIO ................................................................................................................................................. 25 7.3.1 Microphone ..................................................................................................................................... 25 7.3.2 Receiver/Speaker ............................................................................................................................. 26 7.3.3 Grounding and Layout ...................................................................................................................... 27 7.4 SIM ..................................................................................................................................................... 28 7.4.1 ESD ................................................................................................................................................ 29 7.4.1.1 ESD protection diodes ................................................................................................................. 29 7.4.1.2 SIM holder ................................................................................................................................. 31 7.5 ANTENNA ............................................................................................................................................ 32 7.6 ANTENNA STATUS DETECTION APPLICATION .......................................................................................... 33
Version: 0.0.1 - 8 - 2011/6/10 M66 Design Guide
Version: 0.0.1 - 9 - 2011/6/10 M66 Design Guide 1 Power-on / Power-down Sequence The operation voltage of M66 is between 3.3 and 4.2 V (A restricted operation range is between 4.2 and 4.7 V). It is recommended to support a stable voltage in the proper range which is between 3.8 and 4V. 1.1 Power-on sequence 1. The initial state: VBAT: 0V TERM_ON: LOW 2. Power on: VBAT: HIGH (recommended: 3.8V-4V) TERM_ON: HIGH 3. Switch on M66: VBAT: Keep HIGH TERM_ON: Keep LOW for 50ms then pull HIGH and remains. Boot-up sequence ※ Please note that it is recommended to wait at least 50ms to pull LOW the TERM_ON pin after power on (Put VBAT as HIGH). The system will not start if TERM_ON is LOW before power on. ※ An open-collector circuit is needed when using MPU (client) to control the TERM_ON pin.
Version: 0.0.1 - 10 - 2011/6/10 M66 Design Guide 1.2 Switched on The factory default baud rate of M66 is 9600. The prompt”AT-Command Interpreter ready” is output via UART1 after switched on. LED status indication：The LPG pin (PIN 13) of M66 is used to indicate the M66/network status. The LPG outputs different kind of pattern as follows: M66/Network status LPG pattern(unit：sec) M66 startup Always High Power saving mode (Deep sleep mode) Always Low No network (No SIM、PIN required、Not registered…) High: 0.1，Low: 0.9 Registered and idle High: 0.1，Low: 2.9 Connected(MO/MT Call) Always High GPRS transmitting/receiving data Blinking(Note1) Note 1：While in data mode, the LPG pattern is blinking if data is transmitting or receiving. And the LPG keeps LOW if there is no data transmitting/receiving. 1.3 M66 restarts 1. General restart procedure： a. AT+CFUN=0, stop all network-related action. b. AT%RST to restart M66. 2. Emergency restart procedure： a. In case there is no response of any AT commands. b. Pull EMERG_OFF low for 50ms and then pull high. c. Proceed the startup procedure(Please refer to 1.1)
Version: 0.0.1 - 11 - 2011/6/10 M66 Design Guide 1.4 M66 switch off 1. SW switch off procedure： a. AT+CFUN=0, stop all network-related action. b. AT%MSO, switch off M66. c. Remove VBAT. 2. HW switch off procedure： a. AT+CFUN=0, stop all network-related action. b. Pull TERM_ON low for 50ms and then pull high to shutdown M66. c. Remove VBAT.
Version: 0.0.1 - 12 - 2011/6/10 M66 Design Guide 2 Initialization procedure In this chapter, it describes the initialization procedure when using M66. A suggested procedure and description of initialization. AT OK ATE0 OK AT%TSIM %TSIM 1 OK AT+CPIN? +CPIN: READY OK AT+CSQ +CSQ: 28,99 OK AT+CREG=1 OK AT+COPS? +COPS: 0,0,"CHINA MOBILE OK AT+CGATT？ +CGATT: 1 OK To check UART1 works normally. The factory default baud rate is 9600 without HW flow control. The 3-wired UART is also supported, M66 internally pull low CTS. Echo off. To check SIM existence. 1: SIM exist, 0: No SIM To check SIM and PIN1 READY: PIN1 passed To check the RSSI value. <rssi> value: 0~31, 99 means no network. To enable network registration unsolicited result code. To query the network ”CHINA MOBILE” is registered. To check GPRS attached or detached GPRS attached.
Version: 0.0.1 - 13 - 2011/6/10 M66 Design Guide AT+GMI Qisda OK AT+CGMR HW REVISION: S02 SW REVISION: 0.01 BUILD DATE: 2011/01/05 BUILD TIME: 16:05 OK AT+GSN 358688000000XXX OK AT+CIMI 466018770553XXX OK To query the manufacturer ID. To query the SW/HW revision. HW information SW information SW revision building date SW revision building time To query the product serial number ID. To query the international mobile subscriber ID.
Version: 0.0.1 - 14 - 2011/6/10 M66 Design Guide 3 Short Message There are two formats of SMS which are PDU (Protocol Data Unit) and Text. The format could be selected by AT command. The default format id PDU and it is still recommended to select the mode during initialization. 3.1 Initialization The suggested SMS initialization procedure and description AT+CMGF=1 OK AT+CSCA? +CSCA: “+886935074443”,145 OK AT+CPMS=”SM”,”SM”,”SM” +CPMS: 3, 15, 3, 15, 3, 15 OK AT+CPMS? +CPMS: "SM", 3, 15, "SM", 3, 15, "SM", 3, 15 OK To select the text format. (Text format for example) To query the Service Center Address In general, this information is stored in SIM. If not, please contact the operator for more information. The SMS is normally executed only if the service center address is set correctly. To select memory storages. To query memory storages and remaining space. It must have enough space when using SMS. Please erase the messages if it is full. 3.2 Sending a SMS The suggested procedure of sending message and its description AT+CMGS=“12345678900” >Test message +CMGS: 99 OK To send a message. The number is between quotation marks. To text the content and finished with ctrl-z for sending. Sending successfully indication +CMGS: <value>.
Version: 0.0.1 - 15 - 2011/6/10 M66 Design Guide 3.3 Receiving a SMS The suggested procedure of receiving message and its description AT+CNMI=2,1 OK +CMTI: “SM”,1 AT+CMGR=1 +CMGR:"REC UNREAD","886960530355","","2011/01/05 20:23:44+32" tset OK AT+CMGD=1 OK AT+CMGD=1,4 OK To set New Message Indication. There will be no indication if NMI does not set. A new message is stored in SIM. To read the 1st message stored in SIM. The information of the message. The content of the message. To delete the 1st message. To delete all messages.
Version: 0.0.1 - 16 - 2011/6/10 M66 Design Guide 4 Voice Call The acoustic is highly related to the HW design especially the tooling. Please contact us for acoustic tuning if needed. And please provide the equipment(s), we will arrange it and provide the final acoustic parameters. The tuning has its limitation, not all equipments could reach the best quality. The schematics or tooling may need to be modified. Please also provide the schematics about the audio part. Each product is identical and unique. Please do not use the same parameters on different products. 4.1 Initialization The basic initialization procedure and its description AT%NFI? %NFI: 0,-6,0 OK at%NFO? %NFO: 0,6,0 OK AT%SNFS=1 OK AT%VLB=1 OK AT%STN=-26 OK To query the current audio input path. To query the current audio output path. To select the 2nd audio path. To enable the echo suppression. To set the sidetone gain to mute. The basic procedure is only tuning gain and path. Please contact us for a better quality if distortion, noise, echo… happens to your products.
Version: 0.0.1 - 17 - 2011/6/10 M66 Design Guide 4.2 Mobile Originated call (MO) Outgoing call (MO) ATD10086; OK ATH OK NO CARRIER To make an MO call. The number is 10086. Please ended with a semicolon in voice call. To disconnect the call. The call is disconnected by remote party. 4.3 Mobile Terminated call (MT) Incoming call (MT) AT+CLIP=1 OK RING +CLIP: "1234567",129,"",0,"",0 RING +CLIP: "1234567",129,"",0,"",0 ATA OK ATH OK NO CARRIER To enable a called subscriber to get the calling line identity of the calling party when receiving a MT call. Incoming call indication. The information of the incoming call. The caller ID is 1234567. (Notify every 3 seconds by default.) To Answer the call. To disconnect the call. The remote side disconnect the call.
Version: 0.0.1 - 18 - 2011/6/10 M66 Design Guide 5 PPP Data Call 5.1 Get ready for PPP data call Initialization of PPP data call AT+COPS? +COPS: 0,0,“CHINA MOBILE” OK AT+CSQ +CSQ: <rssi>,<ber> OK AT+CGATT? +CGATT:1 OK AT+CGDCONT=1,“IP”,“CMNET” OK To make sure that a registered network is available. To check the signal strength (rssi). The maximum number for rssi is 31. To make sure that GPRS is enabled. To register to CMNET of CHINA MOBILE. 5.2 Dialing To execute ATD*99# with PPP tool.
Version: 0.0.1 - 19 - 2011/6/10 M66 Design Guide 6 M2M TBD
Version: 0.0.1 - 20 - 2011/6/10 M66 Design Guide 7 M66 Interface M66 50-pin connector interface: PIN Name PIN No. I/O/P Desctiption SIM_CLK 1 Output SIM clock SIM_VCC 2 Power SIM power SIM_IO 3 Input/Output SIM input/output SIM_RST 4 Output SIM reset SIM_DET 5 Output SIM detect SIM_GND 6 SIM ground NC 7 GND 8 Ground USB_DM 9 Input/Output USB DM USB_DP 10 Input/Output USB DP NC 11 NC 12 LPG 13 Output LED paging indicator ANT_EMG 14 Output Emergency indication for antenna detection RXD 15 Output UART1 RXD Ant_Dect_EN 16 Input Interrupt for 36V applied on the antenna signal line TXD 17 Input UART1 TXD VDD-RTC 18 Power RTC backup battery connection pad RXD2 19 Output UART2 RXD TXD2 20 Input UART2 TXD GND 21 Ground GND 22 GND 23 GND 24 GND 25 VBAT 26 Power Power (recommend 3.8V~4.0V) VBAT 27 VBAT 28 VBAT 29 VBAT 30 VDD-IO 31 Power UART1 power supply RING 32 Output UART1 RING indicator NC 33 Output UART1 DSR RTS 34 Input UART1 RTS NC 35 Input UART1 DTR NC 36 CTS 37 Output UART1 CTS Ant_Dect_ADC 38 Input DCD 39 Output UART1 DCD EMERG_OFF 40 Input Hardware power off TERM_ON 41 Input Power On GND 42 Ground MIC2 43 Input Hands-free MIC input MICBIAS 44 Output Hands-free MIC bias MIC1-P 45 Input MIC positive input(+) MIC1-N 46 Input MIC negative input(-) SPK-N 47 Output Hands-free speaker negative output (-) SPK-P 48 Output Hands-free speaker positive output (+) EAR-P 49 Output Handheld earpiece positive output (+) EAR-N 50 Output Handheld earpiece negative output (-)
Version: 0.0.1 - 21 - 2011/6/10 M66 Design Guide 7.1 Power The operating voltage of M66 is between 3.3V and 4.7V. Please make sure that the supply voltage is still in the proper range when a maximum current is drawn from the power supplu when a maximum RF output power is required. Please note that once the supply voltage to M66 drops below 3.3V, module would be shut down. If a power supply regulator is used for VBAT (power supply to M66), please make sure the maximum output current rating should be more than 2A which is the minimum requirement for a maximum RF output power. A reference design for a switching power supply is shown below. The voltage rating of C31 and C35 should be raised higher if Vin is greater than 12V. LM2676S-ADJ (or LM2673S-ADJ) can be used as the switching regulator in the reference design. C58 6.8N1 2VBATL633uH/3AR27 1K 1% R28 2.49K 1%C30 10nF/50VC363.3nFD5RB051L-401 2C340.1UFC51100pF12U3LM2676S-ADJGND4Vout 1Vin2ON//OFF7FB 6CB 3C31100uF/16VC350.47uF/16VVBATD4S3J1 2J6CON3-9V123C33330uF/10VTO-263Vbatt=Vfb*(1+R27/R28)=4.21VVfb=1.21V A large capacitor with low ESR or parallel capacitors can be used to compensate the insufficient supply current provided by the power regulator. The required capacitance can be calculated from the following equations. C = Capacitance in μF Δt = GSM time slot (577 μs) Q = Electricity charger ΔU = Voltage drop ΔI = Compensation in current (the required current – the supplied current)
Version: 0.0.1 - 22 - 2011/6/10 M66 Design Guide During power layout design, there are 2 reminders A. Width A.1 VBAT width: at least 80mil. B. Recommend to have at least 7 via holes if VBAT needs to go through different layers to have a minimum resistance.
Version: 0.0.1 - 23 - 2011/6/10 M66 Design Guide 7.2 UART The serial interface UART1 supports 6-wired, 4-wired, or 2-wired interface. M66 communicates with an external MPU via UART1. The factory default baud rate of UART1 is 9600 and it supports auto baud rate. The main function of UART2 is for debug. It communicates with PC via UART transceiver. M66 serves as a DCE and the UART pin definition is as the following table. RS232 pin Name Direction M66 pin name M66 pin no. 3 Transmit Data (TXD) DTE  M66 TXD 17 2 Receive Data (RXD) DTE  M66 RXD 15 7 Request To Send (RTS) DTE  M66 RTS 34 8 Clear To Send (CTS) DTE  M66 CTS 37 1 Data Carrier Detect (DCD) DTE  M66 DCD 39 9 Ring Indicator (RI) DTE  M66 RI 32 It is recommended to use 3V interface.
Version: 0.0.1 - 24 - 2011/6/10 M66 Design Guide A level shift circuit should be added to the system if the UART interface of host side is not 3V. The following is an example of 5V interface.
Version: 0.0.1 - 25 - 2011/6/10 M66 Design Guide 7.3 Audio It divides into 2 parts, microphone (uplink) and receiver/speaker (downlink). 7.3.1 Microphone Microphone schematics design is shown below for reference: 1. Please use the differential circuit design. 2. The microphone signal traces should be as short as possible. 3. Add decoupling circuits for external microphone bias and audio power supply to reduce TDD noise. 4. Audio traces should be kept away from the VBATT and high speed clock traces. 5. Good shielding for audio path including components and traces. If possible, use via holes to connect the ground shielding above and beneath the audio signals. 6. Twisted pair for external microphone lines. No necessary to use copper foil to wrap around external microphone lines. 7. The distance between microphone and antenna should be at least 10 cm. 8. Add the small capacitor (33pF) across the microphone input traces to suppress the noise.
Version: 0.0.1 - 26 - 2011/6/10 M66 Design Guide 7.3.2 Receiver/Speaker Receiver/speaker schematics design is shown below for reference: As to the Hands-free application, it is suggested to use MIC2/MICBIAS and SPK-P/SPK-N to get a better audio performance. SPK-P/SPK-N could drive a 8Ω speaker directly without an external audio amplifier and the output power is 500 mW. J3CON3123C22 2.2U 6.3VR17220R182.2K JMICBIASMIC2C2733P J C281000P KC3133P J C3233P JSPK-PC3033P JSPK-NJ4CON21122
Version: 0.0.1 - 27 - 2011/6/10 M66 Design Guide 7.3.3 Grounding and Layout Good grounding and conductive screws/screw holes are important to the audio quality and performance. Please take special attention to the PCB layout of the screw holes and the surrounding ring area. They should be copper plated and electrically conductive. Tighten the screws which should be electrical conductive. The screw holes and surrounding pad area should be conductive.
Version: 0.0.1 - 28 - 2011/6/10 M66 Design Guide Recommended audio trace layout is illustrated in the following diagram. 7.4 SIM The Vpp pin (Programming Voltage) is no function in current plug-in SIM. Please leave it opened. The reference circuit is depicted below. Balanced circuit
Version: 0.0.1 - 29 - 2011/6/10 M66 Design Guide 7.4.1 ESD 7.4.1.1 ESD protection diodes An ESD protection circuit could prevent the SIM cards from being damaged by ESD. Please add an ESD circuit close to the CIM circuit to prevent ESD damaged. It is suggested to use the following EDS protection diode.
Version: 0.0.1 - 30 - 2011/6/10 M66 Design Guide Electrical characteristics of the ESD protection diodes are shown as below for reference.
Version: 0.0.1 - 31 - 2011/6/10 M66 Design Guide Recommended ESD protection components from different vendors:  SESMF05C  SENZQA5V6AV5  SEDF6A6V8  AMOTECH  AVSC 5S 04F 025 7.4.1.2 SIM holder Besides ESD protection, the placement and layout of the SIM holder is also important to SIM protection. 1. The ESD protection unit should be placed close to the SIM holder. 2. The ground pin of ESD protection unit should be directly connected to main ground. It will make the ESD energy discharged to ground plane. 3. The trace width should be at least 0.3mm between SIM holder and ESD protection unit. 4. The ESD protection unit should be between SIM holder and M66. 5. The trace between ESD protection unit and M66 should be in a different layer and the width should be at least 0.1mm.
Version: 0.0.1 - 32 - 2011/6/10 M66 Design Guide 7.5 Antenna M66 has an antenna pad on the BOTTOM side. It is possible to solder the coaxial cable directly. The impedance of the cable should be 50 ohm (±10%) M66 antenna pad 1mm 2mm 7.5mm 7.5mm
Version: 0.0.1 - 33 - 2011/6/10 M66 Design Guide 7.6 Antenna status detection application Being able to detect and diagnose the antenna is a valuable feature for many system integrators, and especially for automotive applications. The ability to detect whether the antenna is connected to the communication appliance is useful for diagnosing installation or production problems as well as any tampering with the system. Users can detect the connection status by AT command. The responses are three kinds of status: 1. Antenna is connected to the RF cable properly. 2. The signal line of antenna is disconnected from RF Cable. 3. The signal line of antenna is connected to GND by accident. If the signal line of antenna is short circuited to the +36V Power line ,(Ex. The battery in automobile), M66 will inform MPU of emergency status by ANT_EMG pin. Application Reference Circuitry is shown below. The following assumes that the application is using a commonly found 10KΩ DC terminated antenna. The green bold line is micro-strip line with 50Ω characteristic impedance. PAD1 is the RF connector for Antenna. Ant_Dect_EN 2Ant_Dect_ADC 2R32 0 JZD1MM5Z3V0A KJ82K90002003112233PAD1ANT-PADA1GND 2GND3GND4GND 5C4047P FR3015K FL4NCR3168K FR2718K FL3NCL218NH JR288.2K FR2915K FVIO_3V3 2,3

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