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Figure 9: The minimal VBAT voltage requirement at VBAT drop
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/down Scenarios
4.2.1.
Power on SIM800H
User can power on SIM800H 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 circuit is shown
as below.
Figure 10:
Powered on/down module using transistor
Figure 11: Powered on/down module using button
The power on timing is illustrated as in the following figure.
SIM800H_Hardware_Design_V1.01
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Содержание SIM800H
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