SIM Tech SIMCom SIM900-DS Hardware Design Download Page 27 | Manualshive

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Smart Machine Smart Decision

Figure 22: Speaker with amplifier reference circuit

4.6.2

Microphone Interfaces Configuration

10pF

33pF

33pF

33pF

SIM900-DS_Hardware Design_V1.00

27

2013-01-20

MIC_1P

MIC_1N

Electret

Microphone

10pF

10pF

ESD

ANTI

ESD

ANTI

The lines in bold type should

be accorded to differential

signal layout rules

These components

should be placed to

microphone as close as

possible

MODULE

s

Figure 23 : Microphone reference circuit

Microphone input also could be used to LINE-IN input. For details, please refer to

document [6]

.

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Summary of Contents for SIMCom SIM900-DS

Page 1: ...SIM900 DS_Hardware Design_V1 00...

Page 2: ...the customer s possession Furthermore system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integr...

Page 3: ...M900 DS 19 4 2 3 Restart SIM900 DS by PWRKEY Pin 21 4 3 Power Saving Mode 21 4 3 1 Minimum Functionality Mode 21 4 3 2 Sleep Mode 1 AT CSCLK 1 22 4 3 3 Wake Up SIM900 DS from Sleep Mode 1 AT CSCLK 1 2...

Page 4: ...d Operating Conditions 37 5 3 Digital Interface Characteristics 37 5 4 SIM Card Interface Characteristics 38 5 5 VDD_EXT Characteristics 38 5 6 SIM1_VDD and SIM2_VDD Characteristics 38 5 7 VRTC Charac...

Page 5: ...13 Pin definition of the GPIO interface 34 Table 14 Absolute maximum ratings 37 Table 15 Recommended operating conditions 37 Table 16 Digital interface characteristics 37 Table 17 SIM card interface...

Page 6: ...re 12 Timing of power down SIM900 DS by PWRKEY 20 Figure 13 Timing of restart SIM900 DS 21 Figure 14 RTC supply from capacitor 23 Figure 15 RTC supply from non chargeable battery 23 Figure 16 RTC supp...

Page 7: ...Smart Machine Smart Decision SIM900 DS_Hardware Design_V1 00 7 2013 01 20 Version History Date Version Description of change Author 2013 01 20 1 00 Origin Zhaojuntao...

Page 8: ...ll the space requirements in user applications such as M2M smart phone PDA and other mobile devices SIM900 DS has 68 SMT pads and provides all hardware interfaces between the module and customers boar...

Page 9: ...ad Audio features Speech codec modes z Half Rate ETS 06 20 z Full Rate ETS 06 10 z Enhanced Full Rate ETS 06 50 06 60 06 80 z Adaptive multi rate AMR z Echo Cancellation z Noise Suppression Serial por...

Page 10: ...n network settings such as DTX off on FR EFR HR hopping sequences antenna GPRS STANDBY Module is ready for GPRS data transfer but no data is currently sent or received In this case power consumption d...

Page 11: ...z Flash z The GSM radio frequency part z The antenna interface z The other interfaces SIM900 DS_Hardware Design_V1 00 11 2013 01 20 Analog base band Digital base band Power management unit Radio Frequ...

Page 12: ...Smart Machine Smart Decision 3 Package Information 3 1 Pin out Diagram Figure 2 SIM900 DS pin out diagram Top view SIM900 DS_Hardware Design_V1 00 12 2013 01 20...

Page 13: ...en released to power on down the module Pulled up internally Audio interface MIC1_P 19 MIC1_N 20 I Differential audio input SPK1_P 21 SPK1_N 22 O Differential audio output SPK2_P 23 Single audio outpu...

Page 14: ...D with a TVS diode array SIM1_PRESENCE 34 I SIM1 card detection If it is unused keep open SIM2 interface SIM2_VDD 43 O Voltage supply for SIM card Support 1 8V or 3V SIM card SIM2_DATA 35 I O SIM2 dat...

Page 15: ...Smart Machine Smart Decision 3 3 Package Dimensions Figure 3 Dimensions of SIM900 DS Unit mm SIM900 DS_Hardware Design_V1 00 15 2013 01 20...

Page 16: ...ed PCB footprint outline Unit mm Note Keep copper out of area A Do not place via in area B to avoid short circuit between the via on customer board and the test points on the bottom side of the module...

Page 17: ...he desired output VBAT a DC DC power supply will be preferable because of its better efficiency especially with the 2A peak current in burst mode of the module The following figure is the reference ci...

Page 18: ...decrease voltage drops in the transmit burst The power IC and the bypass capacitor should be placed to the module as close as possible Figure 8 The minimal VBAT voltage requirement at VBAT drop 4 1 2...

Page 19: ...serial port every time when SIM900 DS is powered on For details please refer to the chapter AT IPR in document 1 4 2 2 Power down SIM900 DS SIM900 DS will be powered down in the following situations...

Page 20: ...send URC NORMAL POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which is at low level at this t...

Page 21: ...ails please refer to document 1 4 2 3 Restart SIM900 DS by PWRKEY Pin When the module works normally if the user wants to restart the module follow the procedure below 1 Power down the module 2 Wait f...

Page 22: ...receive paging or SMS from network but the serial port is not accessible Note For SIM900 DS it requests to set AT command AT CSCLK 1 and ensure DTR at high level to enable the sleep mode 1 the defaul...

Page 23: ...ied for the system Current output for backup battery when the VBAT power supply is in present and the backup battery is in low voltage state The RTC power supply of module can be provided by an extern...

Page 24: ...is the serial port and the other is the debug port The module is designed as a DCE Data Communication Equipment The following figure shows the connection between module and client DTE TXD RXD RTS CTS...

Page 25: ...tobauding Autobauding allows SIM900 DS to automatically detect the baud rate of the host device Pay more attention to the following requirements z Synchronization between DTE and DCE When DCE powers o...

Page 26: ...two analog output interfaces SPK1P 1N and SPK2P which can directly drive 32 receiver AT command AT CMIC is used to adjust the input gain level of microphone AT command AT SIDET is used to set the side...

Page 27: ...V1 00 27 2013 01 20 MIC_1P MIC_1N Electret Microphone 10pF 10pF ESD ANTI ESD ANTI The lines in bold type should be accorded to differential signal layout rules These components should be placed to mic...

Page 28: ...ophone Load Resistance 1 2 2 2 k Internal biasing DC Characteristics 2 5 V THD 1 at F 1KHz pre amp gain 20 dB PGA gain 14 dB 15 9 SIM900 DS_Hardware Design_V1 00 28 2013 01 20 mVrms Differential input...

Page 29: ...e SIM card socket The reference circuit of the 8 pin SIM card holder is illustrated in the following figure SIM900 DS_Hardware Design_V1 00 29 2013 01 20 MODULE SMF05C VCC GND RST VPP CLK I O PRESENCE...

Page 30: ...C707 10M006 5122 SIM card holder Table 8 Pin description Amphenol SIM card holder Pin name Signal Description C1 SIM_VDD SIM card power supply C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C5 GN...

Page 31: ...D C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I O C8 SIM_PRESENCE Detect SIM card presence 4 8 LCD Display SPI Interface SIM900 DS provides a serial LCD display interface It cou...

Page 32: ...ad the voltage value For details of this AT command please refer to document 1 Table 10 ADC specification Parameter Min Typ Max Unit Voltage range 0 2 8 V ADC Resolution 10 bits Sampling rate 200K Hz...

Page 33: ...viour of data calling as a receiver Figure 31 RI behaviour of URC or receive SMS However if the module is used as caller the RI will remain high Please refer to the following figure Figure 32 RI behav...

Page 34: ...and AT SGPIO The input voltage level of the GPIO can also be read by the AT command AT SGPIO For more details please refer to document 1 Table 13 Pin definition of the GPIO interface Pin name Pin numb...

Page 35: ...provides an I2 C interface which is only used in the embedded AT application Note This function is not supported in the standard firmware If user wants this function the firmware must be customized Pl...

Page 36: ...value only can be got after the antenna tuning Usually matching components value is provided by antenna vendor the default value of R101 and R102 are 0 and reserve the place of C101 and C102 without...

Page 37: ...are for digital interface pins such as keypad GPIO I2 C UART LCD PWMs and DEBUG 5 2 Recommended Operating Conditions Table 15 Recommended operating conditions Symbol Parameter Min Typ Max Unit VBAT Po...

Page 38: ...el input voltage 2 4 V 1 7 V VOH High level output voltage 2 7 V 0 1 V VOL Low level output voltage 0 1 V 5 5 VDD_EXT Characteristics Table 18 VDD_EXT characteristics Symbol Parameter Min Typ Max Unit...

Page 39: ...dual standby Sleep mode BS PA MFRMS 2 2 5 mA GSM850 EGSM900 DCS1800 SIM card1 and SIM card2 dual standby Idle mode PCS1900 23 mA PCL 5 250 PCL 12 107 GSM850 EGSM900 PCL 19 80 PCL 0 185 PCL 7 92 SIM c...

Page 40: ...e ESD test results are shown in the following table Table 22 The ESD characteristics Temperature 25 Humidity 45 Pin Contact discharge Air discharge VBAT 5KV 10KV GND 4KV 10KV RXD TXD 3KV 6KV Antenna p...

Page 41: ...3 4 0 30 3 4 1 28 3 4 2 26 3 4 3 24 3 4 4 22 3 4 5 20 3 4 6 18 3 4 7 16 3 4 8 14 3 4 9 12 4 5 10 10 4 5 11 8 4 5 12 6 4 5 13 4 4 5 14 2 5 6 15 28 0 5 6 For the module s output power the following is s...

Page 42: ...25 SIM900 DS conducted RF receive sensitivity Frequency Receive sensitivity Typical Receive sensitivity Max GSM850 109dBm 107dBm EGSM900 109dBm 107dBm DCS1800 109dBm 107dBm PCS1900 109dBm 107dBm 5 10...

Page 43: ...ure 37 Top and bottom view of SIM900 DS Note These test points are only used for module manufacturing and testing They are not for customer using The following figure marked the information of SIM900...

Page 44: ...B Module name C Module part number D Module serial number and bar code E Module IMEI1 and bar code F Module IMEI2 and bar code 6 2 Typical Solder Reflow Profile Figure 39 Typical Solder Reflow Profile...

Page 45: ...synchronous automatic dialing and control 10 GSM 07 07 Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipment ME 11 GSM 07 10 Support GSM 07 10 multiplexing protocol 12 GS...

Page 46: ...Full Rate GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HR Half Rate IMEI International Mobile Equipment Identity Li ion Lithium Ion MO Mobile Originated MS Mobile St...

Page 47: ...fuel depots chemical plants or where blasting operations are in progress Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard Your cellular termin...

Page 48: ...Hardware Design_V1 00 48 2013 01 20 Contact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building No 633 Jinzhong Road Changning District Shanghai P R China 200335 Tel 86 21 3235 3300...

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