SimCom SIM7000 User Manual

Smart Machine Smart Decision
SIM7000 _Hardware Design _V1.04 2018-1-31
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.
4.7K
47K
Turn on / off
impulse
PWRKEY
Power
On/off logic
Vdd
MODULE
1K Ω
100nF
The high voltage of PWRKEY is
0.8V
0.8v
0v
Figure 9: Reference power on/off circuit
The power-on scenarios are illustrated in the following figure.
STATUS
( Output)
T
on
VBAT
PWRKEY
( Input)
UART Port
Undefined
active
T
on( uart)
Undefined
active
USB Port T
on( usb)
Ton( VDD)
VDD_EXT
( Output)
T
on(status
)
Figure 10: Power on timing sequence
Table 8: Power on timing and electronic characteristic
SIMCOM CONFIDENTIAL FILE

SimCom SIM7000 Specifications

General

Brand	SimCom
Model	SIM7000
Category	GSM/GPRS Modules
Language	English