User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 22 of 78
5. Power Supply
The power supply circuitry and board layout are a very important part in the full
product design and they strongly reflect on the product overall performances. Read
carefully the requirements and the guidelines that will follow for a proper design.
5.1. Power Supply Requirements
The UC864-E/G/WD/WDU power requirements are:
Power Supply
Nominal Supply Voltage 3.8V
Max Supply Voltage 4.2V
Supply Voltage Range 3.4V – 4.2V
UC864-E/G/WD/WDU
Mode Average(mA) Mode Description
IDLE mode with GPS OFF
Stand by mode; no call in progress; GPS OFF (in
UC864-G)
WCDMA 22.0
AT+CFUN=1
GSM 15.0
Normal mode; full functionality of the module
WCDMA 17.8
AT+CFUN=4
GSM 17.8
Disabled TX and RX; modules is not registered on the
network
10k
+1.8 / 5V