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SimCom SIM800C, Проектирование аппаратного обеспечения

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                                                                                                                                          Smart Machine Smart Decision

 

SIM800C_Hardware_Design_V1.02

                                            39                       

                          2015-4-27

 

5.

 

PCB Layout 

This section will give some guidelines on PCB layout, in order to eliminate interfere or noise. 
 

5.1

 

Pin Assignment 

 
Before PCB layout, we should learn about pin assignment in order to get reasonable layout with so many 
external components. Following figure is the overview of pin assignment of the module. 

UART1_DTR

USB_DP

VBAT

VBAT

ADC

UART1_RXD

PWRKEY

UART1_CTS

UART1_TXD

UART1_RTS

UART1_DCD

NETLIGHT

SIM_RST

SIM_CLK

SIM_DET

SIM_DATA

BT_ANT

UART2_TXD

SPKP

VRTC

MICP

MICN

USB_VBUS

USB_DM

GSM_ANT

STATUS

SIM_VDD

UART2_RXD

GND

13

SPKN

UART1_RI

14

15

16

21

17

18

19

20

22

23

24

25

26

27

28

29

30

31

32

33

37

36

35

34

1

42

41

40

39

38

5

4

2

3

6

11

10

9

8

7

12

VDD_EXT

GND

GND

GND

GND

GND

GND

GND

UART1_DTR

RF_SYNC

GND

GND

SIM800C

TOP VIEW

VBAT

UART

AUDIO

SIM CART

USB

ANTANA

GND

OTHERS

 

Figure 39: Pin assignment 

 

5.2

 

Principle of PCB Layout 

 

During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card 
interface, audio interface, and so on. 

 

Содержание SIM800C

Страница 1: ...SIM800C_Hardware_Design_V1 02...

Страница 2: ...e 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 integrato...

Страница 3: ...SIM800C 19 4 2 2 Power off SIM800C 20 4 3 Power Saving Mode 22 4 3 1 Minimum Functionality Mode 22 4 3 2 Sleep Mode 1 AT CSCLK 1 22 4 3 3 Wake Up SIM800C from Sleep Mode 1 23 4 3 4 Sleep Mode 2 AT CSC...

Страница 4: ...5 2 3 SIM Card Interface 40 5 2 4 Audio Interface 40 5 2 5 Others 40 6 Electrical Reliability and Radio Characteristics 41 6 1 Absolute Maximum Ratings 41 6 2 Recommended Operating Conditions 41 6 3 D...

Страница 5: ...Smart Machine Smart Decision SIM800C_Hardware_Design_V1 02 5 2015 4 27 III Terms and Abbreviations 49 IV Safety Caution 51...

Страница 6: ...EFINITION OF THE NETLIGHT 35 TABLE 21 STATUS OF THE NETLIGHT PIN 35 TABLE 22 NETLIGHT MULTIPLEXING FUNCTION 35 TABLE 23 PIN DEFINITION OF THE STATUS 36 TABLE 24 STATUS MULTIPLEXING FUNCTION 36 TABLE 2...

Страница 7: ...OF THE SERIAL INTERFACES 26 FIGURE 19 RESISTOR MATCHING CIRCUIT 26 FIGURE 20 DIODE ISOLATION CIRCUIT 26 FIGURE 21 TX LEVEL MATCHING CIRCUIT 27 FIGURE 22 RX LEVEL MATCHING CIRCUIT 27 FIGURE 23 USB REF...

Страница 8: ...00 Origin Yanwu wang Xiaobo bai 2015 01 06 1 01 Update figure1 figure12 figure40 Delete figure26 Add VRTC segment to table5 Update table11 table34 table35 table36 Yanwu wang Xiaobo bai 2015 04 27 1 0...

Страница 9: ...applications such as smart phone PDA and other mobile devices SIM800C is a SMT package with 42 pads and provides all hardware interfaces between the module and customers boards One 3 lines serial port...

Страница 10: ...vices Data USSD support SMS MT MO CB Text and PDU mode SMS storage SIM card SIM interface Support SIM card 1 8V 3V External antenna Antenna pad Audio features Speech codec modes Half Rate ETS 06 20 Fu...

Страница 11: ...wer consumption depends on 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...

Страница 12: ...a functional diagram of SIM800C GSM baseband GSM RF Antenna interface Other interface A nal og base band D i gi t albase band P ow erm anagem entuni t Radio Frequency P ow er S uppl y A nal og I nt e...

Страница 13: ...Hardware_Design_V1 02 13 2015 4 27 3 Package Information 3 1 Pin Out Diagram Figure 2 Pin out Diagram Top view 3 2 Pin Description Table 5 Pin description Pin name Pin number I O Description Comment P...

Страница 14: ...O Power on status Serial port UART1_DTR 6 I Data terminal ready UART1_RI 7 O Ring indicator UART1_DCD 5 O Data carrier detect UART1_CTS 4 O Clear to send UART1_RTS 3 I Request to send UART1_TXD 1 O T...

Страница 15: ..._V1 02 15 2015 4 27 keep open Antenna interface GSM_ANT 32 I O Connect GSM antenna BT_ANT 20 I O Connect Bluetooth antenna Synchronizing signal of RF RF_SYNC 29 O Synchronizing signal of RF 3 3 Packag...

Страница 16: ...Smart Machine Smart Decision SIM800C_Hardware_Design_V1 02 16 2015 4 27 Figure 4 Recommended PCB footprint outline Unit mm...

Страница 17: ...rs and Zener diode should be placed as close as possible to SIM800C VBAT pins V B A T 5 1V 500m W C A CB 33pF 10pF Figure 5 Reference circuit of the VBAT input Table 6 Recommended zener diode Vendor P...

Страница 18: ...capacitor CA 100 F tantalum capacitor ESR 0 7 Another VBAT bypass capacitor CB 1uF 10uF 577us 4 615m s B urst 2A I V B A T V B A T M ax 350m V Figure 8 VBAT voltage drop during transmit burst 4 1 1 Po...

Страница 19: ...p to VBAT in the module internal so external pull up is not necessary Reference circuits are shown as below 4 7K 47K Turn on of f i m pul se P W R K E Y P ow er on of fl ogi c 100K 3V M odul e 1K Figu...

Страница 20: ...ower off over temperature or under temperature automatic power off 4 2 2 1 Power off SIM800C by the PWRKEY Pin Customer can power off SIM800C by pulling down the PWRKEY pin for at least 1 second and r...

Страница 21: ...e module will be automatically powered off OVER VOLTAGE POWER OFF At this moment AT commands can not be executed any more Power off mode can also be indicated by STATUS pin which is at low level at th...

Страница 22: ...ult AT CFUN 4 Flight mode disable RF function Table 7 The current consumption of Function Mode fun Current consumption mA sleep mode 0 0 6 1 0 88 4 0 65 Minimum functionality mode minimizes the curren...

Страница 23: ...enter sleep mode 2 automatically In this mode SIM800C can still receive paging or SMS from network 4 3 5 Wake Up SIM800C from Sleep Mode 2 When SIM800C is in sleep mode 2 AT CSCLK 2 the following met...

Страница 24: ...nchronous serial ports The module is designed as a DCE Data Communication Equipment The following figure shows the connection between module and client DTE Table 8 Serial port and USB pin definition N...

Страница 25: ...lows SIM800C to automatically detect the baud rate of the host device Pay more attention to the following requirements Synchronization between DTE and DCE When DCE powers on with autobauding enabled i...

Страница 26: ...following figure from 5 6K to 14K 1K 5 6K R X D TX D R TS C TS G P I O G P I O E I N T D TE 3 3V 5 6K 5 6K 1K 1K 1K 1K 1K 1K M odul e U A R T1_TX D U A R T1_R X D U A R T1_R TS U A R T1_C TS U A R T1...

Страница 27: ...ering on the module connect USB_VBUS USB_DP USB_DN and GND to PC then install the driver following the prompts a UART port could be recognized by PC customer could achieve the software Debug with this...

Страница 28: ...pin should connect to GND while upgrading Refer to the following figure for debugging and upgrading software U A R T1_TX D M odul e D C E U A R T1_R X D G N D P W R K E Y TX D R X D G N D S eri alP or...

Страница 29: ...l l I dl e R I Figure 27 UART1_RI behaviour as a caller 4 7 Audio Interfaces SIM800C provides an analog input MICP MICN which could be used for electret microphone The module also provides an analog o...

Страница 30: ...10pF Figure 28 Speaker reference circuit 4 7 2 Microphone Interfaces Configuration Electret Microphone The lines in bold type should be accorded to differential signal layout rules These components s...

Страница 31: ...ere will be some cheep noise from speaker output easily So it is better to put big capacitors and ferrite beads near audio PA input TDD noise has something to do with GND signal If GND plane is not go...

Страница 32: ...I O C 707 10M 006 512 2 22pF 100nF S I M _V D D S I M _R S T S I M _C LK S I M _D A TA S I M _D E T E S D A 6V 1 51 51 51 Figure 31 Reference circuit of the 6 pin SIM card holder 4 8 2 SIM Card Desig...

Страница 33: ...ription C1 SIM_VDD SIM card power supply C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C4 GND Connect to GND C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I O C8 SIM_DET Det...

Страница 34: ...ck C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I O Note Every time plug SIM card interval advice is greater than 2s Otherwise may not be able to correct detection 4 9 ADC Table...

Страница 35: ...Status of the NETLIGHT pin Status SIM800C behavior Off Powered off 64ms On 800ms Off Not registered the network 64ms On 3000ms Off Registered to the network 64ms On 300ms Off GPRS communication is est...

Страница 36: ...xing function Pin name Pin number Mode 0 default Mode 1 STATUS 42 STATUS GPIO Note Multiplexing function need different software supply 4 12 RF Synchronization Signal The synchronization signal is use...

Страница 37: ...4 13 1 GSM Antenna Interface SIM800C provides a GSM antenna named GSM_ANT customer could use 50 microstrip line or stripline antenna connect to the module It is recommended to reserve the matching ci...

Страница 38: ...tenna matching circuit R201 C201 C202 are the matching circuit the value should be defined by the antenna design Normally R201 is 0R C202 and C201 are not mounted There are some suggestions for placin...

Страница 39: ...PWRKEY UART1_CTS UART1_TXD UART1_RTS UART1_DCD NETLIGHT SIM_RST SIM_CLK SIM_DET SIM_DATA BT_ANT UART2_TXD SPKP VRTC MICP MICN USB_VBUS USB_DM GSM_ANT STATUS SIM_VDD UART2_RXD GND 13 SPKN UART1_RI 14 1...

Страница 40: ...are 10 GND pads in the module these pads could enhance the GND performances On the upper layer of these pads do not trace any signal if possible 5 2 3 SIM Card Interface SIM card holder has no anti E...

Страница 41: ...ng Conditions Table 28 Recommended operating conditions Symbol Parameter Min Typ Max Unit VBAT Power supply voltage 3 4 4 0 4 4 V TOPER Operating temperature 40 25 85 TSTG Storage temperature 45 90 6...

Страница 42: ...mA 6 6 VDD_EXT Characteristics Table 32 VDD_EXT characteristics Symbol Parameter Min Typ Max Unit VO Output voltage 2 7 2 8 2 9 V IO Output current 50 mA 6 7 VRTC Characteristics Table 33 VRTC charac...

Страница 43: ...0 EGSM900 DCS1800 PCS1900 323 330 212 227 mA mA mA mA IVBAT Average currnet Data mode GPRS 4Rx 1Tx GSM850 EGSM900 DCS1800 PCS1900 213 210 150 162 mA mA mA mA IMAX Peak current During Tx burst 2 0 A No...

Страница 44: ...GPP TS 05 05 technical specification requirement Table 36 GSM850 and EGSM900 conducted RF output power GSM850 EGSM900 Tolerance dB for conditions PCL Nominal output power dBm Normal Extreme 5 33 2 2 5...

Страница 45: ...n Table 38 Conducted RF receive sensitivity Frequency Receive sensitivity Typical Receive sensitivity Max GSM850 EGSM900 109dBm 107dBm DCS1800 PCS1900 109dBm 107dBm 6 10 3 Module Operating Frequencies...

Страница 46: ...IM800C_Hardware_Design_V1 02 46 2015 4 27 7 Manufacturing 7 1 Top and Bottom View of SIM800C Figure 40 Top and bottom view of SIM800C 7 2 Typical Solder Reflow Profile Figure 41 Typical solder reflow...

Страница 47: ...7 4 Baking Requirements SIM800C modules are vacuum packaged and guaranteed for 6 months storage without opening or leakage under the following conditions the environment temperature is lower than 40...

Страница 48: ...of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS 7 GSM 11 14 Digital cellular telecommunications system Phas...

Страница 49: ...2_TXD HO 22 UART3_TXD GPIO0 UART2_RXD I PD 23 UART3_RXD GPIO1 Note Multiplexing function need different software supply III Terms and Abbreviations Table 44 Terms and abbreviations Abbreviation Descri...

Страница 50: ...ation Module SMS Short Message Service TE Terminal Equipment also referred to as DTE TX Transmit Direction SINAD Signal to Noise and Distortion Ratio UART Universal Asynchronous Receiver Transmitter U...

Страница 51: ...a safety hazard Your cellular terminal or mobile receives and transmits radio frequency energy while switched on RF interference can occur if it is used close to TV sets radios computers or other ele...

Страница 52: ...Hardware_Design_V1 02 52 2015 4 27 Contact us Shanghai SIMCom Wireless Solutions Co Ltd Address Building A SIM Technology Building No 633 Jinzhong Road Shanghai P R China 200335 Tel 86 21 3252 3300 Fa...

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