Hardware Design V1.01(091226)
Table Of Contents
- Contents
- Version history
- 1 Introduction
- 2 SIM900 Overview
- 3 Application Interface
- 3.1 SIM900 Pin Description
- 3.2 Operating Modes
- 3.3 Power Supply
- 3.4 Power Up and Power Down Scenarios
- 3.5 Power Saving
- 3.6 Summary of State Transitions (except SLEEP mode)
- 3.7 RTC Backup
- 3.8 Serial Interfaces
- 3.9 Audio Interfaces
- 3.10 SIM Card Interface
- 3.11 LCD Display Interface
- 3.12 Keypad Interface
- 3.13 ADC
- 3.14 Behaviors of the RI
- 3.15 Network Status Indication
- 3.16 General Purpose Input Output (GPIO)
- 3.17 External Reset
- 3.18 PWM
- 3.19 I2C Bus
- 4 Antenna Interface
- 5 Electrical, Reliability and Radio Characteristics
- 6 Mechanics
SIM900 Hardware Design
Table 31: PIN assignment
Pin Number Pin Name Pin Number Pin Name
1
PWRKEY
35
PMW1
2
PWRKEY_OUT
36
PWM2
3
DTR
37
SDA
4
RI
38
SCL
5
DCD
39
GND
6
DSR
40
GPIO1/KBR4
7
CTS
41
GPIO2/KBR3
8
RTS
42
GPIO3/KBR2
9
TXD
43
GPIO4/KBR1
10
RXD
44
GPIO5/KBR0
11
DISP_CLK
45
GND
12
DISP_DATA
46
GND
13
DISP_D/C
47
GPIO6/KBC4
14
DISP_CS
48
GPIO7/KBC3
15
VDD_EXT
49
GPIO8/KBC2
16
NRESET
50
GPIO9/KBC1
17
GND
51
GPIO10/KBC0
18
GND
52
NETLIGHT
19
MIC_P
53
GND
20
MIC_N
54
GND
21
SPK_P
55
VBAT
22
SPK_N
56
VBAT
23
LINEIN_R
57
VBAT
24
LINEIN_L
58
GND
25
ADC
59
GND
26
VRTC
60
RF_ANT
27
DBG_TXD
61
GND
28
DBG_RXD
62
GND
29
GND
63
GND
30
SIM_VDD
64
GND
31
SIM_DATA
65
GND
32
SIM_CLK
66
STATUS
33
SIM_RST
67
GPIO11
34
SIM_PRESENCE
68
GPIO12
SIM900_HD_V1.01 26.12.2009
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