Power On/Power Off/Reset Time Sequence; Power On Sequence - SIM Tech SimCom SIM7100 Hardware Design

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Note: Under-voltage warning function and under-voltage power-off function are disabled by default.
For more information about these AT command, please refer to Document [1].
3.2

Power on/Power off/Reset Time Sequence

3.2.1

Power on Sequence

SIM7100 can be powered on by pulling PWRKEY pin down to ground.
This pin is already pulled up with a 200KΩ resistor to 1.8V in module, so external pull-up resistor is not
necessary. Placing a100nF capacitor and an ESD protection diode close to the PWRKEY pin is strongly
recommended. Please refer to the following figure for recommended reference circuit.
1.8V
200K
Turn on / off
680R
Power
PWRKEY
impulse
On / off logic
4.7K
100nF
47K
MODULE
Figure 11: Reference power on/off circuit
Note: Module could be automatically power on by connecting PWRKEY pin to ground via 0R resistor
directly.
The power-on scenarios are illustrated in the following figure.
Figure 12: Power on Timing Sequence
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SIM7100_Hardware Design_V1.01 2015-01-20