UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 34 / 82
The uncritical voltage is 3.3V to 4.35V, If the voltage > 4.35V 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 > 4.35V, the following URC will be presented:
+QIND: “vbatt”,2
The value of voltage threshold can be revised by command AT+QCFG=“vbatt”, refer to document [1]
for details.
3.8. Reset the Module
The RESET_N can be used to reset the module.
Table 8: RESET_N Pin Description
V
IH
max = 2.1V
V
IH
min = 1.3V
V
IL
max = 500mV
Pull-up to 1.8V internally
with 200kΩ resistor.
Active low.
You can reset the module by driving the RESET_N to a low level voltage for more than 150ms and then
releasing.
The recommended circuit is similar to the PWRKEY control circuit. You can use open drain/collector
driver or button to control the RESET_N.
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