User's Manual

SIM900B EVB User Guide
SIM900B-EVB_UGD_V1.01 15 14.04.2010
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