Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 46 / 129
VBAT
PWRKEY
≥29.5s
≥650ms
RUNNING
Power-down procedure
OFF
Module
Status
STATUS
(OD)
VDD_EXT
Figure 14: Timing of Turning off Module
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT+QPOWD command to turn off the module, which is similar to turning off the
module via PWRKEY Pin.
Please refer to document [2] for details about the AT+QPOWD command.
1. In order to avoid damaging the internal flash, please do not switch off the power supply when the
module works normally. Only after the module is shut down by PWRKEY or AT command, the
power supply can be cut off.
2. When turn off module with AT command, please keep PWRKEY at high level after the execution of
power-off command. Otherwise the module will be turned on again after successfully turn-off.
3.7.2.3. Turn off Module Using SHDN_N
The following table shows the pin definition of SHDN_N.
Table 8: Pin Definition of SHDN_N
Pin Name
Pin No.
Description
DC Characteristics
Comment
SHDN_N
176
Emergency shutdown
V
IH
max=2.1V
NOTES