a
硬件设计手册
SIM900A_HD_CN_V1.03
SIM900A
硬件设计手册
文档名称:
SIM900A
硬件设计手册
版本:
1.03
日期:
2010-06-29
状态: 发布
文档控制号:
SIM900A_HD_CN_V1.03
前言
感谢½用
SIMCom
提供的
SIM900A
模块。本产品具有标准
AT
½令接口,可以提供
GSM
语音、短消息
等业务。½用前请仔细阅读用户手册,您将领略其完善的功½和简洁的操½方法。
此模块主要用于语音或者数据通讯,本公司不承担由于用户不正常操½造成的财产损失或者人身伤害责
任。请用户按照手册中的技术规格和参考设计开发相应的产品。同时注意½用移动产品特别是
GSM
产品
应该关注的一般安全事项。
在未声明之前,本公司有权根据技术发展的需要对本手册内容进行修改。
版权声明
本手册版权属于SIMCom,任½人未经我公司书面同意复制、引用或者修改本手册½将承担法律责任。
SIM900A_HD_CN_V1.03
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SIM900A
硬件设计手册
目½
目½............................................................................................................................................................................3
版本历史....................................................................................................................................................................8
1 绪论........................................................................................................................................................................9
1.1
相关文档......................................................................................................................................................9
1.2
术语和解释................................................................................................................................................10
1.3
安全警告....................................................................................................................................................12
2 SIM900A综述........................................................................................................................................................13
2.1 SIM900A主要特性.....................................................................................................................................13
2.2 SIM900A
功½框图...................................................................................................................................15
2.3 SIM900A
评估板.......................................................................................................................................16
3
应用接口..............................................................................................................................................................17
3.1 SIM900A
引脚描述...................................................................................................................................17
3.2
工½模式....................................................................................................................................................20
3.3
供电............................................................................................................................................................21
3.3.1
电源引脚
..........................................................................................................................................22
3.3.2
电源监测
..........................................................................................................................................22
3.4
开机关机....................................................................................................................................................22
3.4.1 SIM900A开机 ...................................................................................................................................22
3.4.2 SIM900A关机 ...................................................................................................................................25
3.4.3
重新启动
..........................................................................................................................................27
3.5
省电............................................................................................................................................................28
3.5.1
最小功½模式
..................................................................................................................................28
3.5.2 SLEEP模式(CSCLK=1)....................................................................................................................29
3.5.3
从SLEEP模式(CSCLK=1)唤醒模块...............................................................................................29
3.5.4 SLEEP模式(CSCLK=2)....................................................................................................................29
3.5.5
从SLEEP模式(CSCLK=2)唤醒模块...............................................................................................29
3.6 RTC电源 .....................................................................................................................................................29
3.7
串口............................................................................................................................................................31
3.7.1
串口和调试口功½
..........................................................................................................................33
3.7.2
½件调试和升级
..............................................................................................................................34
3.8
音频接口....................................................................................................................................................35
3.8.1
受话器接口电路
...............................................................................................................................35
3.8.2
麦克风接口电路
..............................................................................................................................36
3.8.3
耳机接口电路
..................................................................................................................................37
3.8.4
相关电气参数
..................................................................................................................................37
3.9 SIM卡接口..................................................................................................................................................38
3.9.1 SIM应用............................................................................................................................................38
3.9.2 SIM
卡座的选择
..............................................................................................................................39
3.10 LCD显示接口...........................................................................................................................................42
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SIM900A
硬件设计手册
3.11
键盘接口..................................................................................................................................................42
3.12
模数½换器(ADC)
..............................................................................................................................43
3.13 RI电平状态...............................................................................................................................................44
3.14
½络状态指示灯......................................................................................................................................45
3.15
通用输入输出接口(GPIO)
......................................................................................................................46
3.16
外部复½输入..........................................................................................................................................46
3.17 PWM .........................................................................................................................................................47
3.18 I
2
C总线 .....................................................................................................................................................47
4
天线接口..............................................................................................................................................................48
4.1
模块射频输出功率....................................................................................................................................48
4.2
模块射频接收灵敏度................................................................................................................................48
4.3
模块工½频段............................................................................................................................................49
5
电气,可靠性和射频特性..................................................................................................................................49
5.1
绝对最大值................................................................................................................................................49
5.2
工½温度....................................................................................................................................................49
5.3
电源额定值................................................................................................................................................50
5.4
耗流............................................................................................................................................................51
5.5
静电防护....................................................................................................................................................52
6
机械尺寸..............................................................................................................................................................52
6.1 SIM900A的机械尺寸.................................................................................................................................52
6.2 SIM900A的顶视图和底视图 .....................................................................................................................54
6.3 SIM900A引脚分配.....................................................................................................................................55
6.4 SIM900A推荐焊接炉温曲线图 .................................................................................................................57
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SIM900A
硬件设计手册
表格索引
表 1: 相关文档
................................................................................................................................................................ 9
表 2: 术语和解释
.......................................................................................................................................................... 10
表
3: SIM900A主要特性 .............................................................................................................................................. 13
表 4:编码格式和最大½络数据速度率
...................................................................................................................... 15
表 5:引脚描述
.............................................................................................................................................................. 17
表
6:工½模式 .............................................................................................................................................................. 20
表
7:AT+CFUN不同设½下的耗流............................................................................................................................. 28
表
8:串口引脚定义 ...................................................................................................................................................... 31
表
9:
串口的逻辑电平
................................................................................................................................................... 32
表
10:音频接口引脚定义 ............................................................................................................................................ 35
表
11:音频输入参数 .................................................................................................................................................... 37
表
12:音频输出参数 .................................................................................................................................................... 38
表
13:SIM卡接口引脚定义 ......................................................................................................................................... 38
表
14:
引脚描述(AMPHENOL
SIM卡座) .................................................................................................................... 40
表
15:引脚描述 (MOLEX SIM卡座) ......................................................................................................................... 41
表
16:LCD接口引脚定义 ............................................................................................................................................ 42
表
17:键盘接口引脚定义 ............................................................................................................................................ 42
表
18:ADC参数............................................................................................................................................................ 43
表
19:RI信号线电平状态 ............................................................................................................................................ 44
表
20:NETLIGHT工½状态 ........................................................................................................................................ 45
表
21:GPIO接口引脚定义........................................................................................................................................... 46
表
22:PWM引脚定义................................................................................................................................................... 47
表
23:I
2
C总线接口引脚定义 ....................................................................................................................................... 48
表
24: SIM900A
传导射频输出功率
............................................................................................................................ 48
表
25: SIM900A
传导射频接收灵敏度
........................................................................................................................ 48
表
26: SIM900A
工½频段
............................................................................................................................................ 49
表
27:绝对最大值 ........................................................................................................................................................ 49
表
28:SIM900A工½温度 ............................................................................................................................................ 49
表
29:SIM900A电源额定值 ........................................................................................................................................ 50
表
30: SIM900A耗流 ...................................................................................................................................................... 51
表
31:ESD
性½参数(温度:25℃,湿度:45%)................................................................................................
52
表
32:引脚分配 ............................................................................................................................................................ 56
SIM900A_HD_CN_V1.03
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29.06.2010
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