Power On/Power Off/Reset Function; Power On - SimCom SIM7000 Hardware Design

3.2

Power on/Power off/Reset Function

3.2.1

Power on

SIM7000 can be powered on by pulling the PWRKEY pin to ground.
The PWRKEY pin has been pulled up with a diode to 1.8V internally, so it does not need to be
pulled up externally. It is strongly recommended to put a 100nF capacitor and an ESD protection
diode close to the PWRKEY pin, as it would strongly enhance the ESD performance of PWRKEY
pin. Please refer to the following figure for the recommended reference circuit.
Turn on / off
impulse
The power-on scenarios are illustrated in the following figure.
VBAT
PWRKEY
( Input )
VDD_ EXT
( Output )
STATUS
( Output )
UART Port
USB Port
Table 8: Power on timing and electronic characteristic
SIM7000 _Hardware Design _V1.04
The high voltage of PWRKEY is 0.8V
0.8v
0v
4.7K
100nF
47K
Figure 9: Reference power on/off circuit
T
on
T
on( VDD)
Undefined
Undefined
Figure 10: Power on timing sequence
Smart Machine Smart Decision
Vdd
Power
1K Ω
PWRKEY
On/off logic
MODULE
T on(status )
T
on( uart )
T
on( usb)
active
active
2018-1-31