Specifications

3.7 VRTC and ALARM
These are the two system connector signals that relate to the RTC. VRTC is powered
from VCC.
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.
TIP
3.7.1 Using ALARM as periodic power on
It is possible to use the ALARM feature to fully power up the application. The
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.
Gx64 APPLICATION NOTE
Figure 10: ALARM application example
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Power Management
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