Gpio Interface; Perst - SimCom SIM7200 Hardware Manual

4.6 GPIO Interface

SIM7200 provides 2 GPIO pins. The output voltage level of the GPIO can be set by AT command "AT+ SGPIO".
The input voltage level of the GPIO can also be read by AT command "AT+ SGPIO". For more details, please
refer to document [1].
Table 13: Pin definition of the GPIO
Pin name Pin number
GPIO7 44
46
GPIO6

4.7 PERST#

The PERST# pin could be used as an emergency reset. SIM7200 has power-up reset function, so power-up reset
pulse is not necessary. When the PERST# pin is pulled to ground, the module will be reset.
The following table is the electrical characteristics of The PERST# pin.
Table 14: PERST# Electrical Characteristic
Symbol Parameter
V High-level input voltage
IH
V Low-level input voltage
IL
T Reset low level hold on time
low-hold
The low level pulse time must be longer than 50us，The following figure is the timing of reset function.
Reference circuit is recommended in the following figure:
SIM7200-PCIe_ Hardware_Design _V1.01
Reset state
Pull up
Pull up
Min
1.2
-0.3
50
T
low-hold
3.3V
PERST#
Figure 18: Reset timing
Smart Machine Smart Decision
Typ Max
1.8 2.1
- 0.63
- -
27
Unit
V
V
us
2016-05-19