User's Manual

CE910 Family Hardware User Guide
1vv0301010 Rev.11 – 2015-10-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 55 of 75
10.5. RTC Bypass Output
The VRTC pin brings out the Real Time Clock supply but it is NOT separate from the rest of the
digital part. So unlike other Telit’s products, CE910 series cannot support RTC function if VBATT is
not supplied. In this reason xE910 RTC Backup Application Note is NOT valid for CE910.
In summary in order to use RTC function with CE910, VBATT must be supplied from the application.
VRTC also supplies reference power to help CE910 check the time from SMPL (Sudden Momentary
Power Loss).
So it is recommended as best practice to connect VRTC to a shunt capacitor (VRTC to GND) and the
acceptable capacitor value is:
Parameter
Min
Keep-alive capacitor
on Pad no. = C14
6.8uF
NOTE:
VBATT must be supplied in order to use RTC function.
NOTE:
It is recommended to add a keep-alive capacitor on VRTC.
WARNING:
NO devices must be powered from this pin.
10.6. VAUX/PWRMON Power Output
A regulated power supply output is provided in order to supply small devices from the module. This
output is active when the module is ON and goes OFF when the module is shut down. The operating
range characteristics of the supply are:
Operating Range – VAUX/PWRMON power supply
Parameter
Min
Typical
Max
Output voltage
1.77V
1.8V
1.83V
Output current
200mA