SIM800C datasheet(36/52 Pages) SIMCOM

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Smart Machine Smart Decision

SIM800C_Hardware_Design_V1.02

2015-4-27

4.11. Operating Status Indication

The pin42 is for operating status indication of the module. The pin output is high when module is powered on,

and output is low when module is powered off.

Table 23: Pin definition of the STATUS

Pin name

Pin number

Description

STATUS

Operating status indication

Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios”

4.11.1. STATUS Multiplexing Function

Table 24: STATUS multiplexing function

Pin name

Pin number

Mode 0(default)

Mode 1

STATUS

GPIO

Note: Multiplexing function need different software supply.

4.12. RF Synchronization Signal

The synchronization signal is used to indicate incoming GSM burst.

Table 25: Definition of the RF_SYNC pin

The timing of the synchronization signal is shown below.

T ransm itburst

R F _SYN C

577us

220us

Figure 35: RF_SYNC signal during transmit burst

4.12.1. RF_SYNC Multiplexing Function

RF_SYNC can also be used as GPIO to indicate the RF Jamming. The RF_SYNC function and RF Jamming

Detection function can be switched by AT+SJDR command.

Table 26: RF_SYNC Multiplexing function

Pin name

Pin number

Description

RF_SYNC

Transmit synchronization signal

SIM800C Datasheet(PDF) 36 Page - SIMCom