SIM800H datasheet(28/73 Pages) SIMCOM

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SIM800H Datasheet(PDF) 28 Page - SIMCom

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

2015-07-27

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