SIM800C datasheet(19/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

4.1.2.

Monitoring Power Supply

AT command “AT+CBC” can be used to monitor the VBAT voltage. For detail, please refer to document [1].

4.2. Power on/off SIM800C

4.2.1.

Power on SIM800C

Customer can power on SIM800C by pulling down the PWRKEY pin for at least 1 second and release. This pin

is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference circuits are

shown as below.

4.7K

47K

T urn on/off

impulse

P W R KEY

Pow er

on/offlogic

100K

Module

Figure 10: Powered on/down module using transistor

PW R K EY

Pow er

on/offlogic

100K

M odule

Figure 11: Powered on/down module using button

The power on timing is illustrated as in the following figure.

V IL<0.7V

U ndefind

Active

VB AT

PW R K EY

(INP UT )

t>3s

VD D _EXT

ST A T U S

t>1s

SerialP ort

T >1.5s

T>55m s

Figure 12: Timing of power on module

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