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3.7.2.3. Automatic Shutdown
The module will constantly monitor the voltage applied 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 to 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
The value of voltage threshold can be revised by AT command, refer to document [1] for details.
3.8. Reset the Module
The RESET_N can be used to reset the module.
Table 9: RESET_N Pin Description
Pin Name
Pin No.
RESET_N
17
The module can be reset by driving the RESET_N to a low level voltage for more than 100ms and then
releasing.
UG95_Hardware_Design
Description
Reset the module
Confidential / Released
UMTS/HSPA Module Series
DC Characteristics
V
max=2.1V
IH
V
min=1.3V
IH
V
max=0.5V
IL
UG95 Hardware Design
Comment
Pull-up to VRTC
internally with 200kΩ
resistor.
Active low.
34 / 72
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