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GSM/GPRS Module Series

M66 Hardware Design

M66_Hardware_Design Confidential / Released 22 / 80

3.3. Power Supply

3.3.1. Power Features of Module

The power supply is one of the key issues in designing GSM terminals. Because of the 577us radio burst
in GSM every 4.615ms, power supply must be able to deliver high current peaks in a burst period. During
these peaks, drops on the supply voltage must not exceed minimum working voltage of module.

For the M66 module, the max current consumption could reach to 1.6A during a burst transmission. It will
cause a large voltage drop on the VBAT. In order to ensure stable operation of the module, it is
recommended that the max voltage drop during the burst transmission does not exceed 400mV.

Vdrop

4.615ms

577us

IBAT

VBAT

Burst:1.6A

Figure 3: Voltage Ripple during Transmitting

POWER DOWN

Normal shutdown by sending the

AT+QPOWD=1

command or using the

PWRKEY pin. The power management ASIC disconnects the power supply from
the base band part of the module, and only the power supply for the RTC is
remained. Software is not active. The UART interfaces are not accessible.
Operating voltage (connected to VBAT) remains applied.

Minimum
Functionality Mode
(without removing
power supply)

AT+CFUN

command can set the module to a minimum functionality mode

without removing the power supply. In this case, the RF part of the module will not
work or the SIM card will not be accessible, or both RF part and SIM card will be
disabled, but the UART port is still accessible. The power consumption in this
case is very low.

Quectel

Confidential

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Summary of Contents for M66

Page 1: ...M66 Hardware Design GSM GPRS Module Series Rev M66_Hardware_Design_V1 1 Date 2014 11 24 www quectel com ...

Page 2: ...ASED UPON CUSTOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE COPY...

Page 3: ...odified output power of Bluetooth 2 Modified the timing of the RFTXMON signal 3 Updated Figure 5 Reference circuit for power supply 4 Modified description of RTC and SIM card interface 5 Modified description of UART Application 6 Deleted the over voltage automatic shutdown function 7 Modified the antenna gain in the Table 24 8 Modified the current consumption information in Section 5 3 5 4 Quectel...

Page 4: ... 3 3 2 Decrease Supply Voltage Drop 23 3 3 3 Reference Design For Power Supply 23 3 3 4 Monitor Power Supply 24 3 4 Power On and Down Scenarios 24 3 4 1 Power On 24 3 4 2 Power Down 26 3 4 2 1 Power Down Module Using the PWRKEY Pin 26 3 4 2 2 Power Down Module Using AT Command 27 3 4 2 3 Under voltage Automatic Shutdown 28 3 4 3 Restart 28 3 5 Power Saving 29 3 5 1 Minimum Functionality Mode 29 3 ...

Page 5: ...53 3 14 RF Transmitting Signal Indication 54 4 Antenna Interface 56 4 1 GSM Antenna Interface 56 4 1 1 Reference Design 56 4 1 2 RF Output Power 57 4 1 3 RF Receiving Sensitivity 58 4 1 4 Operating Frequencies 58 4 1 5 RF Cable Soldering 59 4 2 Bluetooth Antenna Interface 59 5 Electrical Reliability and Radio Characteristics 61 5 1 Absolute Maximum Ratings 61 5 2 Operating Temperature 61 5 3 Power...

Page 6: ...GPRS Module Series M66 Hardware Design M66_Hardware_Design Confidential Released 5 80 8 Appendix A Reference 73 9 Appendix B GPRS Coding Scheme 78 10 Appendix C GPRS Multi slot Class 80 Quectel Confidential ...

Page 7: ...ABLE 16 PIN DEFINITION OF THE SIM INTERFACE 49 TABLE 17 PIN DEFINITION OF THE ADC 51 TABLE 18 CHARACTERISTICS OF THE ADC 51 TABLE 19 BEHAVIORS OF THE RI 51 TABLE 20 WORKING STATE OF THE NETLIGHT 53 TABLE 21 PIN DEFINITION OF THE RFTXMON 54 TABLE 22 PIN DEFINITION OF THE RF_ANT 56 TABLE 23 ANTENNA CABLE REQUIREMENTS 57 TABLE 24 ANTENNA REQUIREMENTS 57 TABLE 25 THE MODULE CONDUCTED RF OUTPUT POWER 5...

Page 8: ...ESIGN FOR AUXILIARY UART PORT 38 FIGURE 20 LEVEL MATCH DESIGN FOR 3 3V SYSTEM 38 FIGURE 21 SKETCH MAP FOR RS 232 INTERFACE MATCH 39 FIGURE 22 REFERENCE DESIGN FOR AIN 41 FIGURE 23 HANDSET INTERFACE DESIGN FOR AOUT1 42 FIGURE 24 SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT1 42 FIGURE 25 HANDSET INTERFACE DESIGN FOR AOUT2 43 FIGURE 26 SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT2 43 FI...

Page 9: ...URE 44 M66 MODULE BOTTOM DIMENSIONS UNIT MM 67 FIGURE 45 RECOMMENDED FOOTPRINT UNIT MM 68 FIGURE 46 TOP VIEW OF THE MODULE 69 FIGURE 47 BOTTOM VIEW OF THE MODULE 69 FIGURE 48 RAMP SOAK SPIKE REFLOW PROFILE 71 FIGURE 49 TAPE AND REEL SPECIFICATION 72 FIGURE 50 DIMENSIONS OF REEL 72 FIGURE 51 RADIO BLOCK STRUCTURE OF CS 1 CS 2 AND CS 3 78 FIGURE 52 RADIO BLOCK STRUCTURE OF CS 4 79 Quectel Confidenti...

Page 10: ...ribes its hardware interface which are connected with the customer application and the air interface This document can help you quickly understand module interface specifications electrical and mechanical details Associated with application note and user guide you can use M66 module to design and set up mobile applications easily Quectel Confidential ...

Page 11: ...on boarding the aircraft if your device offers a Airplane Mode which must be enabled prior to boarding an aircraft Switch off your wireless device when in hospitals or clinics or other health care facilities These requests are desinged to prevent possible interference with sentitive medical equipment Cellular terminals or mobiles operate over radio frequency signal and cellular network and cannot ...

Page 12: ...s including Vehicles and Personal Tracking Security System Wireless POS Industrial PDA Smart Metering and Remote Maintenance Control etc M66 is an SMD type module with LCC package which can be easily embedded into applications It provides abundant hardware interfaces like PCM Interface Designed with power saving technique the current consumption of M66 is as low as 1 3 mA in SLEEP mode when DRX is...

Page 13: ...Connectivity GPRS multi slot class 12 default GPRS multi slot class 1 12 configurable GPRS mobile station class B DATA GPRS GPRS data downlink transfer max 85 6kbps GPRS data uplink transfer max 85 6kbps Coding scheme CS 1 CS 2 CS 3 and CS 4 Support the protocols PAP Password Authentication Protocol usually used for PPP connections Internet service protocols TCP UDP FTP PPP HTTP NTP PING Support P...

Page 14: ...upport autobauding from 4800bps to 115200bps Debug Port Two lines on debug port interface DBG_TXD and DBG_RXD Debug Port only used for firmware debugging Auxiliary Port Used for AT command Phonebook Management Support phonebook types SM ME ON MC RC DC LD LA SIM Application Toolkit Support SAT class 3 GSM 11 14 Release 99 Real Time Clock Supported Physical Characteristics Size 15 8 0 15 17 7 0 15 2...

Page 15: ...erface ADC interface RF interface BT interface BB RF RF PAM 26MHz RF Transceiver RTC AUDIO Serial Interface SIM Interface RF_ANT VBAT PWRKEY VRTC NETLIGHT UART SIM Interface ESD PMU MEMORY BT_ANT PWM AUDIO PCM PCM ADC ADC BT VDD_EXT VDD_EXT Figure 1 Module Functional Diagram 2 4 Evaluation Board In order to help you to develop applications with M66 Quectel supplies an evaluation board EVB RS 232 t...

Page 16: ...ackage and has 44 pins The following chapters provide detailed descriptions about these pins Pin of module Operating modes Power supply Power on down Power saving RTC Serial interfaces Audio interfaces PCM interface SIM card interface ADC Behaviors of the RI Network status indication RF transmitting signal indication Quectel Confidential ...

Page 17: ...D RF_ANT 14 M66 Top View 15 16 17 18 19 20 21 22 36 37 38 39 40 41 42 43 44 1 2 3 4 5 6 7 8 9 10 11 12 13 23 24 25 26 27 28 29 30 31 32 33 34 35 AVDD ADC0 SIM_GND SIM_DATA GND PCM_OUT PCM_IN PCM_SYNC PCM_CLK TXD_AUX RXD_AUX GND BT_ANT RFTXMON VDD_EXT RTS DCD RI DTR TXD RXD NETLIGHT RESERVED SIM_VDD VBAT POWER GND AUDIO UART SIM PCM ANT OTHERS RESERVED Figure 2 Pin Assignment Keep all reserved pins...

Page 18: ...PI Main power supply of module VBAT 3 3V 4 6V VImax 4 6V VImin 3 3V VInorm 4 0V Make sure that supply sufficient current in a transmitting burst typically rises to 1 6A VRTC 44 IO Power supply for RTC when VBAT is not supplied for the system Charging for backup battery or golden capacitor when the VBAT is applied VImax 3 3V VImin 1 5V VInorm 2 8V VOmax 3V VOmin 2V VOnorm 2 8V IOmax 2mA Iin 10uA If...

Page 19: ...cs Comment MICP MICN 3 4 AI Positive and negative voice input Refer to Section 3 8 If unused keep these pins open SPK1P SPK1N 5 6 AO Channel 1 positive and negative voice output If unused keep these pins open Support both voice and ringtone output SPK2P 2 AO Channel 2 voice output AGND 1 Analog ground Separate ground connection for external audio circuits If unused keep this pin open Network Statu...

Page 20: ...above If unused keep these pins open DBG_ RXD 38 DI Receive data Auxiliary Port PIN Name PIN No I O Description DC Characteristics Comment TXD_ AUX 29 DO Transmit data Same as above If unused keep these pins open RXD_ AUX 28 DI Receive data SIM Interface PIN Name PIN No I O Description DC Characteristics Comment SIM_ VDD 14 PO Power supply for SIM card The voltage can be selected by software autom...

Page 21: ...haracteristics Comment PCM_ CLK 30 DO PCM clock VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 2 VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT If unused keep this pin open PCM_ SYNC 31 DO PCM frame synchronization PCM_ IN 32 DI PCM data input PCM_ OUT 33 DO PCM data output Antenna Interface PIN Name PIN No I O Description DC Characteristics Comment RF_ ANT 35 IO GSM antenna pad Imped...

Page 22: ...ssage and SMS from the system normally GSM IDLE Software is active The module has registered to the GSM network and the module is ready to send and receive GSM data GSM TALK GSM connection is ongoing In this mode the power consumption is decided by the configuration of Power Control Level PCL dynamic DTX control and the working RF band GPRS IDLE The module is not registered to GPRS network The mod...

Page 23: ...g the burst transmission does not exceed 400mV Vdrop 4 615ms 577us IBAT VBAT Burst 1 6A Figure 3 Voltage Ripple during Transmitting POWER DOWN Normal shutdown by sending the AT QPOWD 1 command or using the PWRKEY pin The power management ASIC disconnects the power supply from the base band part of the module and only the power supply for the RTC is remained Software is not active The UART interfac...

Page 24: ...0nF 10pF 0603 33pF 0603 Figure 4 Reference Circuit for the VBAT Input 3 3 3 Reference Design For Power Supply The power design for the module is very important since the performance of power supply for the module largely depends on the power source The power supply is capable of providing the sufficient current up to 2A at least If the voltage drop between the input and output is not too high it i...

Page 25: ...he module when the module has become abnormal Power switch circuit like P channel MOSFET switch circuit can also be used to control VBAT 3 3 4 Monitor Power Supply The command AT CBC can be used to monitor the supply voltage of the module The unit of the displayed voltage is mV For details please refer to the document 1 3 4 Power On and Down Scenarios 3 4 1 Power On The module can be turned on by ...

Page 26: ...R x W to set a fixed baud rate for the module and save the configuration to flash memory of the module After these configurations the URC RDY would be received from the UART Port of the module every time when the module is powered on For more details refer to the section AT IPR in document 1 2 When AT command is responded indicates module is turned on successfully or else the module fails to be tu...

Page 27: ...time of T1 is recommended to be 100ms 3 4 2 Power Down The following procedures can be used to turn off the module Normal power down procedure Turn off module using the PWRKEY pin Normal power down procedure Turn off module using command AT QPOWD Under voltage automatic shutdown Take effect when under voltage is detected 3 4 2 1 Power Down Module Using the PWRKEY Pin It is a safe way to turn off t...

Page 28: ... autobauding is active and DTE and DCE are not correctly synchronized after start up The module is recommended to set to a fixed baud rate 2 As logout network time is related to the local mobile network it is recommended to delay about 12 seconds before disconnecting the power supply or restarting the module 3 4 2 2 Power Down Module Using AT Command It is also a safe way to turn off the module vi...

Page 29: ...ecuted The module logs off from network and enters power down mode and only RTC is still active These unsolicited result codes do not appear when autobauding is active and DTE and DCE are not correctly synchronized after start up The module is recommended to set to a fixed baud rate 3 4 3 Restart You can restart the module by driving the PWRKEY to a low level voltage for a certain time which is si...

Page 30: ... In this case the UART port is still accessible but all AT commands related with RF function or SIM card function will be not available If the module has been set by the command with AT CFUN 4 the RF function will be disabled but the UART port is still active In this case all AT commands related with RF function will be not available After the module is set by AT CFUN 0 or AT CFUN 4 it can return ...

Page 31: ...ule and DTE 3 5 4 Summary of State Transition Table 6 Summary of State Transition 3 6 RTC Backup The RTC Real Time Clock function is supported The RTC is designed to work with an internal power supply There are three kinds of designs for RTC backup power Use VBAT as the RTC power source When the module is turned off and the main power supply VBAT is remained the real time clock is still active as ...

Page 32: ...VRTC as the RTC power source As only powering the VRTC pin to keep the RTC will lead an error about 5 minutes a day it is recommended to power VBAT and VRTC pin at the same time when RTC function is needed The recommended supply for RTC core circuits are shown as below Non chargeable Backup Battery Module RTC Core VBAT Power Supply LDO DCDC LDO VRTC 1 5K Figure 11 VRTC is Supplied by a Non chargea...

Page 33: ...provides three serial ports UART Port Debug Port and Auxiliary UART Port The module is designed as a DCE Data Communication Equipment following the traditional DCE DTE Data Terminal Equipment connection Autobauding function supports baud rate from 4800bps to 115200bps The UART Port TXD Send data to RXD of DTE RXD Receive data from TXD of DTE RTS Request to send CTS Clear to send DTR DTE is ready a...

Page 34: ... Send data to the COM port of computer DBG_RXD Receive data from the COM port of computer The Auxiliary UART Port TXD_AUX Send data to the RXD of DTE RXD_AUX Receive data from the TXD of DTE The logic levels are described in the following table Table 7 Logic Levels of the UART Interface Table 8 Pin Definition of the UART Interfaces Parameter Min Max Unit VIL 0 0 25 VDD_EXT V VIH 0 75 VDD_EXT VDD_E...

Page 35: ...flow control After setting a fixed baud rate or autobauding please send AT string at that rate The UART port is ready when it responds OK Autobauding allows the module to detect the baud rate by receiving the string AT or at from the host or PC automatically which gives module flexibility without considering which baud rate is used by the host controller Autobauding is enabled by default To take a...

Page 36: ...ring The DTE may receive unknown characters after switching to new baud rate It is not recommended to switch to autobauding from a fixed baud rate If autobauding is active it is not recommended to switch to multiplex mode To assure reliable communication and avoid any problems caused by undetermined baud rate between DCE and DTE it is strongly recommended to configure a fixed baud rate and save it...

Page 37: ...with hardware flow control is shown as below This connection will enhance the reliability of the mass data communication RTS CTS RTS CTS GND RXD TXD TXD RXD GND Module DCE Host DTE Controller Figure 16 Reference Design for UART Port with Hardware Flow Control 3 7 1 3 Firmware Upgrade The TXD RXD can be used to upgrade firmware The PWRKEY pin must be pulled down before firmware upgrade The referenc...

Page 38: ...le might need to be upgraded due to certain reasons It is recommended to reserve these pins in the host board for firmware upgrade 3 7 2 Debug Port Two lines DBG_TXD and DBG_RXD It outputs log information automatically Debug Port is only used for firmware debugging and its baud rate must be configured as 460800bps Peripheral TXD RXD GND Module DBG_TXD DBG_RXD GND Figure 18 Reference Design for Deb...

Page 39: ...string on the UART port The default baud rate setting is 115200bps and does not support autobauding The baud rate can be modified by AT QSEDCB command For more details please refer to the document 1 Peripheral TXD RXD GND Module TXD_AUX RXD_AUX GND Figure 19 Reference Design for Auxiliary UART Port 3 7 4 UART Application The reference design of 3 3V level match is shown as below If the host is a 3...

Page 40: ...ard RS 232 interface Since the electrical level of module is 2 8V so a RS 232 level shifter must be used Note that you should assure the IO voltage of level shifter which connects to module is 2 8V TXD RXD RTS CTS DTR RI DCD Module GND C1 C1 C2 C2 V VCC GND V 3 3V T1IN T2IN T3IN T4IN R1IN R2IN R3IN R1OUT R2OUT R3OUT T1OUT T2OUT T5OUT T3OUT T4OUT T5IN GND GND R1OUT 1 2 3 4 5 6 7 8 9 GND To PC Seria...

Page 41: ...gtone output and so on and can be switched by AT QAUDCH command For more details please refer to the document 1 Use AT command AT QAUDCH to select audio channel 0 AIN AOUT1 the default value is 0 1 AIN AOUT2 this channel is always used for earphone For each channel you can use AT QMIC to adjust the input gain level of microphone You can also use AT CLVL to adjust the output gain level of receiver ...

Page 42: ...vious Therefore you can have a choice based on test results Sometimes even no RF filtering capacitor is required The capacitor which is used for filtering out RF noise should be close to audio interface or other audio interfaces Audio alignment should be as short as possible In order to decrease radio or other signal interference the position of RF antenna should be kept away from audio interface ...

Page 43: ...e 10pF 0603 Close to speaker GND ESD 33pF 0603 33pF 0603 GND 10pF 0603 ESD 10pF 0603 33pF 0603 Figure 23 Handset Interface Design for AOUT1 SPK1P SPK1N Differential layout Amplifier circuit Module 10pF 0603 Close to speaker GND ESD 33pF 0603 33pF 0603 GND 10pF 0603 ESD 10pF 0603 33pF 0603 Figure 24 Speaker Interface Design with an Amplifier for AOUT1 Quectel Confidential ...

Page 44: ...ial layout Amplifier circuit 10pF 0603 10pF 0603 33pF 0603 33pF 0603 Close to Speaker GND GND ESD ESD C2 C1 Figure 26 Speaker Interface Design with an Amplifier for AOUT2 The suitable differential audio amplifier can be chosen from the Texas Instrument s website http www ti com There are also other excellent audio amplifier vendors in the market 1 The value of C1 and C2 here depends on the input i...

Page 45: ... 0603 10pF GND 10pF 0603 0603 0603 10pF 10pF Figure 27 Earphone Interface Design 3 8 5 Audio Characteristics Table 10 Typical Electret Microphone Characteristics Table 11 Typical Speaker Characteristics Parameter Min Typ Max Unit Working Voltage 1 2 1 5 2 0 V Working Current 200 500 uA External Microphone Load Resistance 2 2 K Ohm Parameter Min Typ Max Unit AOUT1 Output Single ended Load resistanc...

Page 46: ...finition of PCM Interface 3 9 1 Configuration M66 module supports 13 bit line code PCM format The sample rate is 8 KHz and the clock source is 256 KHz and the module can only act as master mode The PCM interface supports both long and short synchronization simultaneously Furthermore it only supports MSB first For detailed information please refer to the table below Table 13 Configuration AOUT2 Out...

Page 47: ...tension and in the Zero padding mode the low three bits of 16 bits are zero padding Under zero padding mode you can configure the PCM input and output volume by executing AT QPCMVOL command For more details please refer to Chapter 3 9 4 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 PCM_CLK PCM_SYNC PCM_OUT PCM_IN MSB MSB Sign extension Sign extension Figure 28 Long Synchronization Sign...

Page 48: ...9 Long Synchronization Zero Padding Diagram PCM_CLK PCM_SYNC PCM_OUT PCM_IN 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB MSB Sign extension Sign extension Figure 30 Short Synchronization Sign Extension Diagram PCM_CLK PCM_SYNC PCM_OUT PCM_IN 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB MSB Zero padding Zero padding Figure 31 Short Synchronization Zero Padding Diag...

Page 49: ...CM 3 9 4 AT Command There are two AT commands about the configuration of PCM listed as below AT QPCMON can configure operating mode of PCM AT QPCMON mode Sync_Type Sync_Length SignExtension MSBFirst Table 14 QPCMON Command Description Parameter Scope Description Mode 0 2 0 Close PCM 1 Open PCM 2 Open PCM when audio talk is set up Sync_Type 0 1 0 Short synchronization 1 Long synchronization Sync_Le...

Page 50: ... with a SIM application Tool kit The SIM interface is powered by an internal regulator in the module Both 1 8V and 3 0V SIM Cards are supported Table 16 Pin Definition of the SIM Interface Parameter Scope Description vol_pcm_in 0 32767 Set the input volume vol_pcm_out 0 32767 Set the output volume The voice may be distorted when this value exceeds 16384 Pin Name Pin No Description SIM_VDD 14 Suppl...

Page 51: ...n module and SIM cassette short and wide Keep the width of ground no less than 0 5mm to maintain the same electric potential The decouple capacitor of SIM_VDD is less than 1uF and must be near to SIM cassette To avoid cross talk between SIM_DATA and SIM_CLK Keep them away with each other and shield them with surrounded ground In order to offer good ESD protection it is recommended to add a TVS dio...

Page 52: ...ristics of the ADC 3 12 Behaviors of The RI Table 19 Behaviors of the RI Pin Name Pin No Description AVDD 8 Reference voltage of ADC circuit ADC0 9 Analog to digital converter Item Min Typ Max Units Voltage Range 0 2 8 V ADC Resolution 10 bits ADC Accuracy 2 7 mV State RI Response Standby HIGH Voicecall Change to LOW then 1 Change to HIGH when call is established 2 Use ATH to hang up the call RI c...

Page 53: ...s shown below RI Idle Ring Off hook by ATA On hook by ATH HIGH LOW SMS received Figure 34 RI Behavior of Voice Calling as a Receiver RI Idle Calling On hook Talking HIGH LOW Idle Figure 35 RI Behavior as a Caller RI Idle or Talking URC or SMS received HIGH LOW 120ms Figure 36 RI Behavior of URC or SMS Received 120ms then changes to HIGH URC Certain URCs can trigger 120ms low level on RI For more d...

Page 54: ...e following table Table 20 Working State of the NETLIGHT A reference circuit is shown as below Module NETLIGHT 4 7K 47K 300R VBAT Figure 37 Reference Design for NETLIGHT State Module Function Off The module is not running 64ms On 800ms Off The module is not synchronized with network 64ms On 2000ms Off The module is synchronized with network 64ms On 600ms Off The GPRS data transmission after dialin...

Page 55: ...MON There are two different modes for this function 1 Active during the TX activity RFTXMON pin is used to indicate the TX burst when it outputs a high level 220us later there will be a TX burst You can execute AT QCFG RFTXburst 1 to enable the function The timing of the RFTXMON signal is shown below Transmit burst RFTXMON 577us 220us 220us 577us 4 615ms Figure 38 RFTXMON Signal during Burst Trans...

Page 56: ...ring the Call RFTXMON will be HIGH during a call and the pin will become LOW after being hanged up You can execute AT QCFG RFTXburst 2 to enable the function The timing of the RFTXMON signal is shown below RFTXMON Idle Calling Hanged up HIGH LOW Figure 39 RFTXMON Signal during Call Quectel Confidential ...

Page 57: ...impedance of 50Ω 4 1 GSM Antenna Interface There is a GSM antenna pad named RF_ANT for M66 Table 22 Pin Definition of the RF_ANT 4 1 1 Reference Design The external antenna must be matched properly to achieve best performance so the matching circuit is necessary the reference design for RF is shown as below Module RF_ANT 0R NM NM Figure 40 Reference Design for GSM Antenna Pin Name Pin No Descripti...

Page 58: ...erformance To minimize the loss on the RF trace and RF cable take design into account carefully The following table shows the requirement on GSM antenna Table 23 Antenna Cable Requirements Type Requirements GSM850 EGSM900 Cable insertion loss 1dB DCS1800 PCS1900 Cable insertion loss 1 5dB Table 24 Antenna Requirements Type Requirements Frequency Range Depending by frequency band s provided by the ...

Page 59: ...nsitivity Table 26 The Module Conducted RF Receiving Sensitivity 4 1 4 Operating Frequencies Table 27 The Module Operating Frequencies PCS1900 30dBm 2dB 0dBm 5dB Frequency Receive Sensitivity GSM850 109dBm EGSM900 109dBm DCS1800 109dBm PCS1900 109dBm Frequency Receive Transmit ARFCH GSM850 869 894MHz 824 849MHz 128 251 EGSM900 925 960MHz 880 915MHz 0 124 975 1023 DCS1800 1805 1880MHz 1710 1785MHz ...

Page 60: ...transmit data or voice wirelessly over a short distance It is described as a short range communication technology intended to replace the cables connecting portable and or fixed devices while maintaining high level of security Bluetooth is standardized as IEEE802 15 and operates in the 2 4 GHz range using RF technology Its data rates of up to 3Mbps M66 is fully compliant with Bluetooth specificati...

Page 61: ...tion is recommended as in the following figure Module BT_ANT 0R NM NM Figure 42 Reference Design for Bluetooth Antenna There are some suggestions for placing components and RF trace lying for Bluetooth RF traces Antenna matching circuit should be closed to the antenna Keep the RF traces as 50Ω The RF traces should be kept far away from the high frequency signals and strong disturbing source Quecte...

Page 62: ...able Table 29 Absolute Maximum Ratings 5 2 Operating Temperature The operating temperature is listed in the following table Table 30 Operating Temperature Parameter Min Max Unit VBAT 0 3 4 73 V Peak Current of Power Supply 0 2 A RMS Current of Power Supply during one TDMA frame 0 0 7 A Voltage at Digital Pins 0 3 3 08 V Voltage at Analog Pins 0 3 3 08 V Voltage at Digital analog Pins in Power Down...

Page 63: ...upply voltage Voltage must stay within the min max values including voltage drop ripple and spikes 3 3 4 0 4 6 V Voltage drop during transmitting burst Maximum power control level on GSM850 and EGSM900 400 mV IVBAT Average supply current Power down mode SLEEP mode DRX 5 150 1 3 uA mA Minimum functionality mode AT CFUN 0 IDLE mode SLEEP mode AT CFUN 4 IDLE mode SLEEP mode 13 0 98 13 1 0 mA mA mA mA...

Page 64: ...de GPRS 1Rx 4Tx GSM850 EGSM9001 DCS1800 PCS19002 458 4853 462 439 mA mA Peak supply current during transmission slot Maximum power control level on GSM850 and EGSM900 1 6 2 A Condition Current Consumption Voice Call GSM850 power level 5 300mA Typical 223mA power level 12 Typical 83mA power level 19 Typical 62mA EGSM900 power level 5 300mA Typical 219mA power level 12 Typical 83mA power level 19 Ty...

Page 65: ...cal 159mA power level 19 Typical 99mA EGSM900 power level 5 600mA Typical 546mA power level 12 Typical 160mA power level 19 Typical 101mA DCS1800 power level 0 490mA Typical 366mA power level 7 Typical 131mA power level 15 Typical 93mA PCS1900 power level 0 480mA Typical 348mA power level 7 Typical 138mA power level 15 Typical 94mA DATA Mode GPRS 4 Rx 1Tx CLASS 12 GSM850 power level 5 350mA Typica...

Page 66: ...ocessing handling and operation of any applications using the module The measured ESD values of module are shown as the following table Table 33 The ESD Endurance Temperature 25º C Humidity 45 GSM850 power level 5 660mA Typical 457mA power level 12 Typical 182mA power level 19 Typical 106mA EGSM900 power level 5 660mA Typical 484mA power level 12 Typical 187mA power level 19 Typical 109mA DCS1800 ...

Page 67: ...M66_Hardware_Design Confidential Released 66 80 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module 6 1 Mechanical Dimensions of Module Figure 43 M66 Module Top and Side Dimensions Unit mm Quectel Confidential ...

Page 68: ...GSM GPRS Module Series M66 Hardware Design M66_Hardware_Design Confidential Released 67 80 Figure 44 M66 Module Bottom Dimensions Unit mm Quectel Confidential ...

Page 69: ...3 36 Figure 45 Recommended Footprint Unit mm 1 The module should be kept about 3mm away from other components in the host PCB 2 The circular test points with a radius of 1 75mm in the above recommended footprint should be treated as keepout areas keepout means do not pour copper on the mother board NOTE Quectel Confidential ...

Page 70: ...ries M66 Hardware Design M66_Hardware_Design Confidential Released 69 80 6 3 Top View of the Module Figure 46 Top View of the Module 6 4 Bottom View of the Module Figure 47 Bottom View of the Module Quectel Confidential ...

Page 71: ...temperature and 60 RH Stored at 10 RH Devices require baking before mounting if any circumstance below occurs When the ambient temperature is 23º C 5º C humidity indication card shows the humidity is 10 before opening the vacuum sealed bag If ambient temperature is 30º C and the humidity is 60 the devices have not been mounted during 72hours Stored at 10 RH If baking is required devices should be ...

Page 72: ...suggested that peak reflow temperature is from 235º C to 245º C for SnAg3 0Cu0 5 alloy Absolute max reflow temperature is 260º C To avoid damage to the module when it was repeatedly heated it is suggested that the module should be mounted after the first panel has been reflowed The following picture is the actual diagram which we have operated Time s 50 100 150 200 250 300 50 100 150 200 250 160 2...

Page 73: ...Design M66_Hardware_Design Confidential Released 72 80 7 3 1 Tape and Reel Packaging The reel is 330mm in diameter and each reel contains 250 modules Figure 49 Tape and Reel Specification Figure 50 Dimensions of Reel Quectel Confidential ...

Page 74: ...se 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS 6 GSM 11 14 Digital cellular telecommunications Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity module Mobile Equipment SIM ME interface 7 GSM 11 11 Digital cellular telecommunications Phase 2 Specification of the Sub...

Page 75: ...ion Description ADC Analog to Digital Converter AMR Adaptive Multi Rate ARP Antenna Reference Point ASIC Application Specific Integrated Circuit BER Bit Error Rate BOM Bill of Material BT Bluetooth BTS Base Transceiver Station CHAP Challenge Handshake Authentication Protocol CS Coding Scheme CSD Circuit Switched Data CTS Clear to Send DAC Digital to Analog Converter DRX Discontinuous Reception DSP...

Page 76: ...S FDMA Frequency Division Multiple Access FR Full Rate GMSK Gaussian Minimum Shift Keying GPRS General Packet Radio Service GSM Global System for Mobile Communications G W Gross Weight HR Half Rate I O Input Output IC Integrated Circuit IMEI International Mobile Equipment Identity IOmax Maximum Output Load Current kbps Kilo Bits Per Second LED Light Emitting Diode Li Ion Lithium Ion MO Mobile Orig...

Page 77: ...me Clock RX Receive Direction SIM Subscriber Identification Module SMS Short Message Service TDMA Time Division Multiple Access TE Terminal Equipment TX Transmitting Direction UART Universal Asynchronous Receiver Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio VOmax Maximum Output Voltage Value VOnorm Normal Output Voltage Value...

Page 78: ...Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value Phonebook Abbreviations LD SIM Last Dialing phonebook list of numbers most recently dialed MC Mobile Equipment list of unanswered MT Calls missed calls ON SIM or ME Own Numbers MSISDNs l...

Page 79: ...g Schemes Scheme Code Rate USF Pre coded USF Radio Block excl USF and BCS BCS Tail Coded Bits Punctured Bits Data Rate Kb s CS 1 1 2 3 3 181 40 4 456 0 9 05 CS 2 2 3 3 6 268 16 4 588 132 13 4 CS 3 3 4 3 6 312 16 4 676 220 15 6 CS 4 1 3 12 428 16 456 21 4 Radio block structure of CS 1 CS 2 and CS 3 is shown as the figure below Figure 51 Radio Block Structure of CS 1 CS 2 and CS 3 Rate 1 2 convoluti...

Page 80: ...ware Design M66_Hardware_Design Confidential Released 79 80 Radio block structure of CS 4 is shown as the following figure Figure 52 Radio Block Structure of CS 4 Block Code No coding 456 bits USF BCS Radio Block Quectel Confidential ...

Page 81: ...1 or 2 2 the first number indicates the amount of downlink timeslots while the second number indicates the amount of uplink timeslots The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications The description of different multi slot classes is shown in the following table Table 37 GPRS Multi slot Classes Multislot Class D...

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