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
6.2 Top and Bottom View of the SIM900
Figure 39: Top view of the SIM900
6.3 PIN Assignment of SIM900
SIM900
TOP VIEW
1
2
17
3
4
10
5
11
6
12
13
7
14
8
15
16
9
52
53
68
54
55
61
56
62
57
63
64
58
65
59
66
67
60
51
50
35
49
48
42
47
41
46
40
39
45
38
44
37
36
43
34
33
18
32
31
25
30
24
29
23
22
28
21
27
20
19
26
PWRKEY_OUT
PWRKEY
DTR
RI
DCD
DSR
CTS
RTS
TXD
RXD
DISP_CLK
DISP_DATA
DISP_D/C
DISP_CS
VDD_EXT
NRESET
GND
GND
MIC_P
MIC_N
SPK_P
SPK_N
LINEIN_R
LINEIN_L
ADC
VRTC
DBG_TXD
DBG_RXD
GND
SIM_VDD
SIM_DATA
SIM_CLK
SIM_RST
SIM_PRESENCE
PWM1
PWM2
SDA
SCL
GND
GPIO1/KBR4
GPIO2/KBR3
GPIO3/KBR2
GPIO4/KBR1
GPIO5/KBR0
GPIO6/KBC4
GPIO7/KBC3
GPIO8/KBC2
GPIO9/KBC1
GPIO10/KBC0
GND
GND
NETLIGHT
GND
GND
VBAT
VBAT
VBAT
GND
GND
RF_ANT
GND
GND
GND
GND
GND
STATUS
GPIO11
GPIO12
Figure 40: SIM900 pin out diagram (Top View)
SIM900_HD_V1.01 26.12.2009
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