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数据搜索系统，热门电子元器件搜索 |
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SIM800L 数据表(PDF) 28 Page - SIMCom |
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SIM800L 数据表(HTML) 28 Page - SIMCom |
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28 / 73 page  Smart Machine Smart Decision External capacitor backup RTC Core 2.2K VRTC Large-capacitance Capacitor Figure 17: RTC supply from capacitor Non-chargeable battery backup Figure 18: RTC supply from non-chargeable battery Rechargeable battery backup Figure 19: RTC supply from rechargeable battery Note: The clock error becomes larger when VBAT is turned off and RTC circuit was supplied from the backup battery or the external capacitor. 4.5. Serial Port and USB Interface SIM800H&SIM800L default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data Communication Equipment). The following figure shows the connection between module and client (DTE). SIM800H&SIM800L_Hardware Design_V2.02 28 2015-07-27 |
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