Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 47 / 129
for the module
V
IH
min=1.3V
V
IL
max=0.5V
Driving the SHDN_N pin to a low level voltage and then releasing it will make the module shut down
unconditionally. The shut-down scenario is illustrated in the following figure.
Shut down pulse
SHDN_N
R1
R2
N MOS
Figure 15: Shut Down the Module Using Driving Circuit
VBAT
SHDN_N
TBD
 200ms
RUNNING
OFF
Module
Status
STATUS
(OD)
Figure 16: Timing of Turning off Module via SHDN_N
1. Pulling down SHDN_N for module shutdown is an emergency option when there are failures in
turning off the module by PWRKEY or AT command. And it is recommended to use an external OD
circuit to control the SHDN_N pin.
2. Never pull up SHDN_N pin.
NOTES