User's Manual

HE910 Hardware User Guide

1vv0300925 Rev.9 – 07-02-2012

12.5 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. NO Devices must be powered from this pin.

12.6 External SIM Holder Implementation

Please refer to the related User Guide (SIM Holder Design Guides, 80000NT10001a).

12.7 VAUX Power Output

A regulated power supply output is provided in order to supply small devices from the

module. The signal is present on Pad R11 and it is in common with the PWRMON

(module powered ON indication) function.

This output is always active when the module is powered ON.

The operating range characteristics of the supply are:

Level

Min

Typical

Max

Output voltage

1.78V

1.80V

1.82V

Output current

60mA

Output bypass

capacitor

(inside the module)

1uF