Sunsea AIoT SIMCom SIM7075G User Manual page 24

3.2.1 Power on
The PWTRKEY pin has a default voltage of 1.5V. SIM7075G can be powered on by briefly pulling the
PWRKEY pin to ground. It is strongly recommended to put an ESD protection diode close to the PWRKEY
pin, as it would strongly enhance the ESD performance of PWRKEY pin.
The PWRKEY pin has its own reset function. The reset time is determined by the internal timer (default is
12.6 seconds). After the PWRKEY is pulled low, the module will be reset after 12.6 seconds. Therefore, it is
not recommended to connect PWRKEY to GND all the time in external circuit design.
Please refer to the following figure for the recommended reference circuit.
The power-on scenarios are illustrated in the following figure.
Table 10: Power on timing and electronic characteristic
Symbol
The time of active low level impulse of PWRKEY pin
Ton
to power on module
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Figure 8: Reference power on/off circuit
Figure 9: Power on timing sequence
Parameter
SIM7075G User Manual V1.00
Min. Typ. Max.
1 - 12.6
Unit
s
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