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UC864-E Hardware User Guide
1vv0300766a Rev.1 - 31/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 46 of 51
11.7 RTC Bypass out
The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital
part, allowing having only RTC going on when all the other parts of the device are off.
To this power output a backup capacitor can be added in order to increase the RTC autonomy during
power off of the battery.
Parameter Symbol Limit Values Unit
min. typ. max.
Input Voltage VRTC 1.50
3.0
3.25 V
Input current, Xtal ON IRTC
1.1 uA
NOTE: NO Devices must be powered from this pin.
11.8 VAUX1 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 – VAUX1 power supply
Min Typical Max
Output voltage
2.75V 2.85V 2.95V
Output current
100mA
Output bypass capacitor
2.2μF
NOTE: During RESET and POWER ON the VAUX line is OFF