SimCom SIM900B EVB Manual

Development Kit Manual
SIM900B-EVB_UGD_V1.01

SIM900B EVB User Guide
SIM900B-EVB_UGD_V1.01 2 14.04.2010
Document Title: SIM900B EVB User Guide
Version: 1.01
Date: 2010-04-14
Status: Release
Document Control ID: SIM900B-EVB_UGD_V1.01
General Notes
Simcom offers this information as a service to its customers, to support application and
engineering efforts that use the products designed by Simcom. The information provided is
based upon requirements specifically provided to Simcom by the customers. Simcom has not
undertaken any independent search for additional relevant information, including any
information that may be in 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 integrator. All specifications supplied herein are
subject to change.
Copyright
This document contains proprietary technical information which is the property of SIMCOM
Limited., copying of this document and giving it to others and the using or communication of
the contents thereof, are forbidden without express authority. Offenders are liable to the
payment of damages. All rights reserved in the event of grant of a patent or the registration of
a utility model or design. All specification supplied herein are subject to change without
notice at any time.
Copyright © Shanghai SIMCom Wireless Solutions Ltd. 2010

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Contents
Contents ............................................................................................................................................3
1. SIM900B EVB..............................................................................................................................5
2. EVB accessory ..............................................................................................................................7
3. Accessory Interface .......................................................................................................................8
3.1 Power Interface ...................................................................................................................8
3.2 Audio Interface....................................................................................................................9
3.3 SIM card interface.............................................................................................................10
3.4 Antenna Interface ..............................................................................................................11
3.5 RS232 Interface.................................................................................................................12
3.6 Operating Status LED .......................................................................................................13
4. Test Interface...............................................................................................................................13
4.1 Serial Interface ..................................................................................................................14
4.2 J2---KEY & CTRL............................................................................................................15
4.3 J3---LCD & I/O.................................................................................................................16
5. EVB and accessory equipment....................................................................................................17
6. Illustration:..................................................................................................................................18
6.1 Running:............................................................................................................................18
6.2 Connecting Net and calling...............................................................................................18
6.3 Downloading .....................................................................................................................18
6.4 Turns off............................................................................................................................18
Figure Index
FIGURE 1:EVB TOP VIEW ...............................................................................................................5
FIGURE 2:EVB BOTTOM VIEW...................................................................................................... 6
FIGURE 3:EVB ACCESSORY...........................................................................................................7
FIGURE 4:POWER INTERFACE ......................................................................................................8
FIGURE 5:AUDIO INTERFACE .......................................................................................................9
FIGURE 6:SIM CARD INTERFACE ...............................................................................................10
FIGURE 7:ANTENNA INTERFACE ............................................................................................... 11
FIGURE 8:SERIAL PORT AND DEBUG PORT .............................................................................12
FIGURE 9:STATUSLED...................................................................................................................13
FIGURE 10:TEST INTERFACE OVERVIEW.................................................................................13
FIGURE 11:J1 INTERFACE.............................................................................................................14
FIGURE 12:J2 INTERFACE.............................................................................................................15
FIGURE 13:J3 INTERFACE.............................................................................................................16
FIGURE 14:EVB AND ACCESSORY EQUIPMENT...................................................................... 17

SIM900B EVB User Guide
SIM900B-EVB_UGD_V1.01 4 14.04.2010
SCOPE
This document give the usage of SIM900B EVB, user can get useful info about the SIM900B
EVB quickly through this document.
This document is subject to change without notice at any time.

SIM900B EVB User Guide
1. SIM900B EVB
Figure 1:EVB TOP view
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SIM900B EVB User Guide
Figure 2:EVB BOTTOM view
A: SIM900B module interface
B: SIM card interface
C: headset interface
D: Download switch, turn on or off download function
E: VBAT switch, switch the voltage source from the adaptor or external battery
F: PWRKEY key, turn on or turn off SIM900B
G: buzzer
H: expand port, such as keypad port, main and debug serial port, display port
I: MAIN serial port for downloading, AT command transmiting, data exchanging
J: DEBUG serial port
K: hole for fixing the antenna
L: source adapter interface
M: light
N: hole for fixing the SIM900B
O: headphones interface
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2. EVB accessory
Figure 3:EVB accessory
A: 5V DC source adapter
B: headset
C: antenna
D: antenna transmit cable
E: serial port cable
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3. Accessory Interface
3.1 Power Interface
Figure 4:Power Interface
Pin Signal I/O Description
1 Adapter input I 5V/2.5A DC source input
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3.2 Audio Interface
Figure 5:Audio Interface
Headset interface:
Pin Signal I/O Description
1 MIC1P I Positive microphone input
2 SPK1P O Positive speak output
3 SPK1N O Negative speak output
4 MIC1N I Negative microphone input
Earphone interface:
Pin Signal Input/Output Description
5 MIC2P&SPK2P I/O Auxiliary positive input and output
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3.3 SIM card interface
Figure 6:SIM card interface
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3.4 Antenna Interface
Figure 7:Antenna Interface
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3.5 RS232 Interface
Figure 8:Serial Port and Debug Port
Serial Port——MAIN Interface
Debug Port——DEBUG Interface
Main Interface:
Pin Signal I/O Description
1 DCD O Data carrier detection
2 TXD O Transmit data
3 RXD I Receive data
4 DTR I Data Terminal Ready
5 GND GND
7 RTS I Request to Send
8 CTS O Clear to Send
9 RI O Ring Indicator
Debug Interface:
Pin Signal I/O Description
2 DBG_TXD O Transmit data
3 DBG_RXD I Receive data
5 GND GND
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3.6 Operating Status LED
Figure 9:StatusLED
Working state of status LED as list:
State Module function
Off Module is not running
64ms On/ 800ms Off Module does not find the network
64ms On/ 3000ms Off Module find the network
64ms On/ 300ms Off GPRS communication
4. Test Interface
Figure 10:Test interface overview
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4.1 Serial Interface
J1---RS232 Interface
Figure 11:J1 Interface
RS232 Interface Pin List:
Pin Signal I/O Description
1 TXD O Transmit data
2 RXD I Receive data
3 DCD O Data carrier detection
4 RI O Ring Indicator
5 CTS O Clear to Send
6 GND GND
7 DTR I Data Terminal Ready
8 DBG_RXD I Receive data
9 RTS I Request to Send
10 DBG_TXD O Transmit data
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4.2 J2---KEY & CTRL
Figure 12:J2 Interface
KEY & CTRL Pin List
Pin Signal I/O Description
1 KBC0 O
2 KBR0 I
3 KBC1 O
4 KBR1 I
5 KBC2 O
6 KBR2 I
7 KBC3 O
8 KBR3 I
9 KBC4 O
10 KBR4 I
Keypad array interface
11 NC
12 PWRKEY I power on key
13 GND GND
14 VBAT I VBAT
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4.3 J3---LCD & I/O
Figure 13:J3 Interface
LCD & I/O Interface Pin List:
Pin Signal I/O Description
1 DISP_DATA I/O Display data line
2 DISP_D/C ODisplay data or address select
3 DISP_CLK ODisplay clock output
4 DISP_RST O Display reset outplay
5 DISP_CS ODisplay enable output
6 ADC0 IAdc input
7 GPIO0 I/O GPIO5 reserved for user
8 BUZZER I/O Buzzer reserved for user
9 SIM_PRESENCE I SIM Card Detection
10 NC
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5. EVB and accessory equipment
At normal circumstance, the EVB and its accessory are equipped as the Figure 14
Figure 14:EVB and accessory equipment
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6. Illustration:
6.1 Running:
(1) Connect the SIM900B module to the 60pins connector on SIM900B EVB, inserting 5V
direct current source adapter, switching the S1 switch on off state, S2 switch on ON
state;
(2) Press the PWRKEY for about 1 second, and then SIM900B module begins running.
You can see the light on the EVB flashing at a certain frequency. By the state, you can judge
whether the EVB and SIM900B can run or not. No function and test can be executed when
we have not connected necessary accessories.
6.2 Connecting Net and calling
(1) connect the serial port line to the MAIN serial port, open the HyperTerminal(AT
command windows) on your Personal computer, the location of the HyperTerminal in
windows2000 is START→accessory→communication→HyperTerminal. Set correct
Baud Rate and COM number. The Baud Rate of SIM900B is 115200, and the COM
number based on which USB port your serial port line insert in, you should select such
as COM3 or COM4 etc.
(2) Connect the antenna to the SIM900B module using an antenna transmit line, insert SIM
card into the SIM card interface, insert headphones or headset into its interface.
(3) Act on the step of running which mentioned above, power on the system, typing the
AT command in the HyperTerminal, and then the SIM900B module will execute its
corresponding function.
6.3 Downloading
Connect the serial port line to the debug port, connect the direct current source adapter, run the
download program and press the START key, then switch the S1 switch on ON state, S2 switch
on ON state, then EVB provide the function of downloading.
6.4 Turns off
Turn off SIM900B module: press the PWRKEY for about 1 second, SIM900B module will be
turned off.

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Notes: the SIM900B EVB is almost the same with the SIM300 EVB.The difference between the
two EVBs are as following:
1.Board to board connector:on SIM900B EVB,the connector is SUNCAGEY’s
BB530-06001-20R; on SIM300 EVB, the connector is ENTERY Company’s 1008-G60N-01R or
JXT’s 210-106001-001
2. R411:on SIM900B EVB,R411 is 15k ohm; on SIM300 EVB,R411 is 0 ohm.
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