
UMTS/HSPA Module Series
UG96 Hardware Design
UG96_Hardware_Design 33 / 76
The emergency shutdown scenario is illustrated as the following figure.
VBAT
PWRDWN_N
≥
100
ms
RUNNING
Power-down procedure
OFF
STATUS
Module
Status
Figure 15: Timing of Emergency Shutdown
PWRDWN_N can only be used when turning off the module by command
AT+QPOWD
or the RESET_N
pin fails.
3.7.2.3. Automatic Shutdown
The module will constantly monitor the voltage applie
d on the VBAT, if the voltage ≤3.5V, the following
URC will be presented:
+QIND: “vbatt”,-1
If the voltage ≥4.21V, the following URC will be presented:
+QIND: “vbatt”,1
The uncritical voltage is 3.3V~4.3V, If the voltage >4.3V or < 3.3V, the module would automatically shut
down itself.
If the voltage <3.3V, the following URC will be presented:
+QIND: “vbatt”,-2
If the voltage >4.3V, the following URC will be presented:
+QIND: “vbatt”,2
NOTE