Monitoring Power Supply; Power On/Off Scenarios; Power On Sim800L - SimCom SIM800L Hardware Design

VBAT
MIN:3.0V
Figure 9: The minimal VBAT voltage requirement at VBAT drop
Note: Hardware power down voltage is 3.0V.
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 Scenarios

4.2.1.

Power on SIM800L

Customer can power on SIM800L by pulling down the PWRKEY pin for more than 1 second at least and release.
This pin is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference
circuit is shown as below.
Turn on/off
impulse
The power on timing is illustrated as in the following figure.
SIM800L(MT6261)_Hardware Design_V1.01
PWRKEY
4.7K
47K
Figure 10: Powered on/off module using transistor
PWRKEY
Figure 11: Powered on/off module using button
Smart Machine Smart Decision
VBAT
100K
Power
on/down logic
1K
Module
VBAT
100K
Power
on/down logic
1K
Module
22 2016-07-07