Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.17.2 Pin Description
Signal Pin number I/O I/O type Description
VRTC 25 I/O Supply RTC Back-up supply
3.17.3 Application
Back-up Power Supply can be provided by:
• A super capacitor
• A non rechargeable battery
• A rechargeable battery cell.
3.17.3.1 Super Capacitor
Figure 36: RTC supplied by a gold capacitor
Estimated range with 0.47 Farad Gold Cap: 25 minutes minimum.
Note
: The Gold Capacitor maximum voltage is 2.5V.
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WA_DEV_Q64_PTS_001-003 January 9, 2009