User's Manual

SIM908 Document
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2. Package Information
2.1 Pin out Diagram
GND GPS-ANT GND GND GPS-VANT-IN GPS-VANT-OUT VCHG TEMP-BAT DTR TXD DCD RI RXD CTS RTS GND GND VBAT VBAT GND
GND GND
GND GSM-ANT
PWRKE
Y
GND
NC GND
GND I2C-SD
A
DISP-CLK I2C-SCL
DISP-DAT
A
N
C
DIS P-D/C N
C
DISP-CS STATUS
GND NETLIGHT
PWM3
PWM2
PWM1
ADC
N
C
GPS/DBG-RXD N
C
SIM-DAT
A
VDD-EXD
SIM-RST GND
SIM-CLK VRT
C
SIM-VDD GND
SPK1N SPK1P
MI C1P MIC1N
SPK2N SPK2P
MIC2P MIC2N
NC NC
GPIO1/KBR0 GPIO2/KBR1 GPIO3/KBR2 GPIO4/KBC0 GPIO5/KBC1 GPIO6/KBC2
GND
NC NC
GND
63 62 61
38 39 40
18
19
20
43
42
41
37 33 34 35 36 29 30 31 32 2
5
26 27 2
8
21 22 23 24
17 44
16 45
15 46
14 47
SIM908
TOP VIEW
13 48
12 49
10 51
11 50
9 52
8 53
7 54
6 55
5 56
4 57
3
58
2
59
64
1 60
68 67 66 6
5
72 71 70 69 76 75 74 73 80 79 78 77
GPS/DBG-TXD
NC
NC
NC
GND
Figure 1: SIM908 pin out diagram (Top view)
2.2 Pin Description
Table 4: Pin description
Pin name Pin number I/O Description Comment
Power supply
VBAT 62, 63 I Power supply 3.2V ~ 4.8V
VRTC 42 I/O Power supply for RTC
It is recommended to
connect with a battery or
a capacitor (e.g. 4.7uF).