User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 34 / 78
If the voltage < 3.2V, 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 AT 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 9: RESET_N Pin Description
You can reset the module by driving the RESET_N to low level voltage for 0.05~0.2s and then releasing.
A reference circuit is shown in the following figure.
Figure 12: Reference Circuit of RESET_N
Pin Name Pin No. Description DC Characteristics Comment
RESET_N 17 Reset the module.
V
IH
max=2.1V
V
IH
min=1.6V
V
IL
max=0.5V
Pull-up to 1.8V internally.
NOTE