User's Manual
Table Of Contents
- 1.Introduction
- 2.Package Information
- 3.Interface Application
- 4.RF Specifications
- 5.Electrical Specifications
- 6.SMT Production Guide
- 7.Packaging
- 8.Appendix
SIM7075G User Manual V1.00
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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.
Figure 8: Reference power on/off circuit
The power-on scenarios are illustrated in the following figure.
Figure 9: Power on timing sequence
Table 10: Power on timing and electronic characteristic
Symbol
Parameter
Min.
Typ.
Max.
Unit
Ton
The time of active low level impulse of PWRKEY pin
to power on module
1
-
12.6
s