Vrtc And Alarm; Using Alarm As Periodic Power On; Figure 10: Alarm Application Example - Wavecom Gx64 Application Note

3.7

VRTC and ALARM

These are the two system connector signals that relate to the RTC. VRTC is powered
from VCC.
TIP
3.7.1

Using ALARM as periodic power on

It is possible to use the ALARM feature to fully power up the application.
example in Figure 10 shows an implementation usable with a GS64 and GR64002
Wireless CPUs. This implementation is useful in applications where there is limited
power supply and the Wireless CPU only periodically needs to send updated
information to a server etc.

Figure 10: ALARM application example

Gx64 APPLICATION NOTE
Power Management
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If the application wants the RTC to operate even if VCC is removed it
has to add a 1.5V "button cell" or capacitor on VRTC as a backup power
source. A recommended battery to use is 0.2mAh Pb-free TS414H
from Seiko.
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
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