User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 30 / 78
3.6.4. Monitor the Power Supply
You can use the AT+CBC command to monitor the VBAT_BB voltage value. For more details, please
refer to document [1].
3.6.5. VDD_EXT
UC15 has a LDO power output, named VDD_EXT. The VDD_EXT is available and output voltage is 2.6V
by default, rated at 100mA.
The following table shows electrical characteristics of VDD_EXT.
Table 7: Electrical Characteristics of VDD_EXT
3.7. Turn on and off Scenarios
3.7.1. Turn on Module by PWRKEY Pin
The following table shows the pin definition of PWRKEY.
Table 8: PWRKEY Pin Description
Symbol Description Min. Typ. Max. Unit
VDD_EXT Output voltage 2.5 2.6 2.7 V
I
OUT
Output current - - 100 mA
Pin Name Pin No. Description DC Characteristics Comment
PWRKEY 18 Turn on/off the module.
V
IH
max=2.1V
V
IH
min=1.6V
V
IL
max=0.5V
Pull-up to 1.8V internally
with 200kΩ resistor.