User's Manual
CE910-DUAL Hardware User Guide
1vv0301010 Rev .0 – 2012-07-10
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 26 of 63
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’s overall performance. Read carefully the
requirements and the guidelines that follow for a proper design.
5.1. Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must
fulfill the following requirements:
Power Supply
Nominal Supply Voltage
3.8V
Max Supply Voltage
4.2V
Supply Voltage Range
3.4V ~ 4.2V
Current Consumption
Mode
Average
(mA)
Mode Description
Power off current (Typical)
140uA(*)
Standby mode
No call in progress (slot cycle index=2)
AT+CFUN=1 29 Normal mode; full functionality of the module
AT+CFUN=4 27
Disabled TX and RX; modules is not registered on the
network
AT+CFUN=0
or
AT+CFUN=5
3
Power saving; CFUN=0 module registered on the
network and can receive voice call or an SMS; but it is
not possible to send AT commands; module wakes up
with an unsolicited code (call or SMS) or rising RTS
line.
CFUN=5 full functionality with power saving;
Module registered on the network can receive
incoming call sand SMS
Tx and Rx mode
A call in progress