Key facts
- Brand
- SimCom
- Model
- SIM900
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 3
- Languages
- EN · ZH
- Last added
- 2012-01-04
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SIMCOM SIM900A-HD CN V1.03 hardware design Manual
This manual describes the hardware architecture of the SIM900A GSM module, including pin assignments, power supply requirements, and the operation of key functions such as sleep modes and the real‑time clock. It is intended for engineers designing circuits that incorporate the module.
The document contains sections on power management (e.g., SLEEP#EHK, SLEEP#EH), RTC operation, voltage specifications, and detailed register tables. It also provides reset procedures and mechanical dimensions needed for board layout. This manual is written in Chinese.
SimCom SIM900 specifications
| Acknowledgement Timer (T1) | 100 ms |
|---|---|
| Response Timer (T2) | 300 ms |
| Wake‑up Response Timer (T3) | 10 s |
| Maximum Frame Size (N1) | 255 |
Source: SIMCom SIM900 Application Note
All SimCom SIM900 documents by type
How to use the product for one specific task, with worked examples.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the Flow Control On command called?
The command is called FCon, which stands for Flow Control On Command.
What is the version and date of this manual?
The manual is version V1.01 dated 22.02.2010.
Which SimCom module does this manual cover?
It covers the SIM900A_HD GSM module.