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Neo_M660A GPRS Module Hardware User Guide

Copyright © Neoway Technology Co., Ltd

13

Figure 3-6

VRTC reference design

Backup

battery

GPRS Module

RTC

Circuit

Capacitor

VRTC

3.1.4 Power On/Off Procedure

Prior to turning on the module, power on the host MCU and finish the UART initialization. Otherwise
conflictions may occur during initialization, due to unstable conditions.

ON/OFF is a low level pulse active input, used to turn on or off the module.

Turning on the Module

While the module is off, power on the module, drive the ON/OFF pin to ground for at least

1.2 second

and

then release. The module starts. After the module is started up, keep the ON/OFF pin at high level. The
UART port will send an unsolicited message (MODEM:STARTUP), indicating the powering on of the
module and can respond to the AT commands.

When you design your program, you can use the unsolicited message (MODEM:STARTUP) to check
whether the module is started or reset improperly.

Figure 3-7 shows the procedure of powering on the module.

Figure 3-7

Turning on procedure

VBAT

ON/OFF

VDD_EXT

UART

1.2s

3s

300 ms

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Содержание Neo_M660A

Страница 1: ...Neo_M660A GPRS Module Hardware User Guide Version 1 1...

Страница 2: ...s document is intended for system engineers SEs development engineers and test engineers The information in this document is subject to change without notice due to product version update or other rea...

Страница 3: ...RS Module Hardware User Guide Copyright Neoway Technology Co Ltd ii Revision Record Issue Changes Revised By Date V1 0 Initial draft Li Zhongqiu 2014 06 V1 1 Modified the definition of pin 53 Li Zhong...

Страница 4: ...3 1 3 VRTC 12 3 1 4 Power On Off Procedure 13 3 1 5 RESET 15 3 2 UART 16 3 3 USB Interfaces 18 3 4 DTR and RING 19 3 4 1 DTR Pin 19 3 4 2 RING Signal Indicator 19 3 5 SIM Card Interface 20 3 6 Running...

Страница 5: ...Neo_M660A GPRS Module Hardware User Guide Copyright Neoway Technology Co Ltd iv 8 Abbreviations 33...

Страница 6: ...with triode separating 15 Figure 3 12 Signal connection between DCE and DTE 16 Figure 3 13 Recommended communication circuit between 3 3V MCU and UART 17 Figure 3 14 Recommended communication circuit...

Страница 7: ...UART 16 Table 3 3 USB interface 18 Table 3 4 DTR and RING pins 19 Table 3 5 SIM card interface 20 Table 3 6 LED indicator 22 Table 3 7 Audio interface 23 Table 4 1 Electric feature of the module 27 T...

Страница 8: ...ons are 24 mm x 24 mm x 2 6 mm which can meet most customers requirements It provides customers the following hardware resources and features UART interfaces used for data communication firmware updat...

Страница 9: ...module Audio Interface MIC SIM PC ADC REC 1 3 Specifications Table 1 1 M660A specifications Specifications Description Band GSM850 EGSM900 DCS1800 PCS1900 MHz dual band quad band Supporting band locki...

Страница 10: ...server and client modes Circuit Switch Data CSD USSD Supplementary service Call forwarding Call waiting Call holding and multi way calling UART Supporting hardware flow control RTS and CTS controlled...

Страница 11: ...9 10 11 12 13 14 15 16 17 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 ON OFF GND DTR RING...

Страница 12: ...an 50 mA 26 VRTC P RTC power supply 2 8 V maximum output charging current 2 mA 2 17 18 29 39 45 46 53 54 58 59 61 65 GND P Ground 1 ON OFF DI ON OFF control input I PU 0 VIL 0 6 2 1 VIH VBAT Low level...

Страница 13: ...card 31 SIM_DATA DI O SIM card data I O 0 VIL 0 6 2 1 VIH 3 1 0 VOL 0 42 2 38 VOH 2 8 33 SIM_CLK DO SIM card clock output 32 SIM_RST DO SIM card reset output LED Indicators 52 LIGHT DO Status LED I P...

Страница 14: ...al output pins I PD indicates digital signal input pins with pull down I PU indicates digital signal input pins with pull up AI indicates analogy signal input pins AO indicates analogy signal output p...

Страница 15: ...is adopted to package the pins of the M660A module Figure 2 2 shows the recommended PCB foot print Figure 2 2 PCB foot print recommended for M660A unit mm 1 00 4 00 4 00 24 00 24 00 12 00 3 78 4 97 1...

Страница 16: ...than 100 ms 3 1 1 VBAT VBAT is the main power supply of the module Its input voltage ranges from 3 5 V to 4 3 V and the preferable value is 3 9V In addition to digital signals and analog signals it su...

Страница 17: ...hance the stability of the power supply A controllable power supply is preferable if used in harsh conditions The module might fail to reset in remote or unattended applications or in an environment w...

Страница 18: ...r withstand voltage and drain current Q2 a common NPN transistor e g MMBT3904 or a digital NPN transistor e g DTC123 If digital transistor is used delete R1 and R2 C3 470 F tantalum capacitor rated at...

Страница 19: ...Power Input 10 uH Reference Design a Reference Design b EMC Considerations Place transient overvoltage protection components like TVS diode on power supply to absorb the power surges SMAJ5 0A C could...

Страница 20: ...module Turning on the Module While the module is off power on the module drive the ON OFF pin to ground for at least 1 2 second and then release The module starts After the module is started up keep...

Страница 21: ...t down Then shut down the main power supply Figure 3 8 shows the procedure of turning off the module Another approach to turn off the module is using AT commands For details see Neo_M660A GPRS Module...

Страница 22: ...le For example when a module is turned on the IO ports of the MCU are still in output status because they have not been initialized completely The module might fails to start if the UTXD signal output...

Страница 23: ...ection between the module DCE and the terminal DTE Figure 3 12 Signal connection between DCE and DTE DCE URXD UTXD CTS RTS DTE UTXD URXD RTS CTS The UART of M660A works at 2 8 V CMOS logic level The v...

Страница 24: ...can be selected based on the tested signal wave Great serial resistance and filter capacity will decrease the signal level significantly resulting in undesired signal wave distortion and the low adap...

Страница 25: ...nce is affected by the signal traces during PCB layout It is recommended that you choose a high speed NPN transistor because the Q1 switch rate will affect the wave quality after level shifting MMBT39...

Страница 26: ...PRS data The host MCU can also control the module to exit sleep mode by controlling DTR Process of entering the sleep mode 1 Keep DTR high level in normal working mode Activate the sleep mode by using...

Страница 27: ...utput SIM_DATA DI O SIM card data IO With internal pull up resistor M660A supports 3 0 V and 1 8 V SIM cards VSIM supplies power for SIM card at Max 30 mA SIM_DATA is pulled up by an internal resistor...

Страница 28: ...es lower than 33 pF or ESD varistors are recommended on the SIM signals especially in automotive electronics or other applications with badly ESD In other applications replace ESD diodes with 27 pF to...

Страница 29: ...ndicate different module status with its various blink behaviors For how to set the LED indicator see Neo_M660A GPRS Module AT Command Set LIGHT can output 4 mA current and 2 8 V high level therefore...

Страница 30: ...gure 3 22 shows a reference audio interface design The peak voltage routed to MICP MICN should not exceed 200 mV AC AGC circuit is integrated inside the module Electret microphone is suited The module...

Страница 31: ...rcuits are designed to meet the requirements for small audio signal far away from interference source and masking PCB routing by ground Figure 3 24 shows a reference design for the receiver interface...

Страница 32: ...copper to main ground plane at the copper edge If the trace between the module and connector has to be longer than 10 mm or built in antenna is used a type matching circuit should be added as shown in...

Страница 33: ...pF otherwise the RF signal will be attenuated RCLAMP0521P from Semtech or ESD5V3U1U from Infineon can be used here On the PCB keep the RF signals and RF components away from high speed circuits power...

Страница 34: ...2 5 A If the voltage is too low the module might fail to start If the voltage is too high or there is a voltage burst during the startup the module might be damaged permanently If you use LDO or DC DC...

Страница 35: ...DRX 9 992 A Voice service Maximum power level in full rate mode GSM850 210 mA EGSM900 200 mA DCS1800 135 mA PCS1900 140 mA GPRS class 12 4TX 1RX 4Up 1Down GSM850 425 mA EGSM900 422 mA DCS1800 260 mA...

Страница 36: ...Neoway Technology Co Ltd 29 Humility 45 Temperature 25 Table 4 4 ESD feature of the module Testing Point Contact Discharge Air Discharge VBAT 8KV 15KV GND 8KV 15KV ANT 8KV 15KV Cover 8KV 15KV RXD TXD...

Страница 37: ...1910MHz 1930 1990MHz 5 1 2 Transmitting Power Table 5 2 Transmitting power GSM850 EGSM900 PCL Transmitting Power Threshold Range 5 33 dBm 2 dBm 6 31 dBm 3 dBm 7 29 dBm 3 dBm 8 27 dBm 3 dBm 9 25 dBm 3...

Страница 38: ...dBm 3 dBm 8 14 dBm 3 dBm 9 12 dBm 3 dBm 10 10 dBm 4 Bm 11 8 dBm 4 Bm 12 6 dBm 4 Bm 13 4 dBm 4 dBm 14 2 dBm 5 dBm 15 0 dBm 5 dBm 5 1 3 Receiving Sensitivity Band Typical GSM800 EGSM900 107 dBm DCS1800...

Страница 39: ...r volume Minimum of 0 15 mm stencil thickness is recommended Use bigger aperture size of the stencil than actual pad size Use a low residue no clean type solder paste 7 Package M660Amodules are packag...

Страница 40: ...Data Terminal Equipment DTMF Dual Tone Multi Frequency DTR Data Terminal Ready EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility EMI Electro Magnetic Interference ESD Electro...

Страница 41: ...adio Frequency ROM Read only Memory RMS Root Mean Square RTC Real Time Clock SIM Subscriber Identification Module SMS Short Message Service SRAM Static Random Access Memory TA Terminal adapter TDMA Ti...

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