SIM900D Hardware Design
SIM900D_HD_V1.02
09.04.2010
16
Flash+SRAM
RF
Power Amplifier
26MHz
Transceiver
Analog
Controller
With PMU
Digital Baseband
RTC
Rese
t
I/Q
COL
PO
WE
R
32.768KHz
RF
interface
Battery
interface
ANT
Battery
GPIO
Serial
Interface
GPIO
Serial Port
Di
gital
int
erface
Debug/upgrading
program
SIM interface
LCD interface
PWRKEY
RTC
Analog interface
Audio interface
ADC
Charger
Figure1: SIM900D functional diagram
2.3 SIM900D Evaluation Board
In order to help you on the application of SIM900D, SIMCom can supply an Evaluation Board (EVB) that
interfaces the SIM900D directly with appropriate power supply, SIM card holder, serial port, handset port,
earphone port, antenna and all GPIO of the SIM900D.
