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WA_DEV_W218_PTS_002 Rev 005 Page 74 of 109
Product Technical Specification &
Customer Design Guidelines
Super Capacitor
Figure 33. RTC Supplied by a Gold Capacitor
Estimated range with 0.47 Farad Gold Cap: 25 minutes minimum.
Note: The Gold Capacitor maximum voltage is 3.9V.
Non-Rechargeable Battery
Figure 34. RTC Supplied by a Non Rechargeable Battery
The diode D1 is mandatory to prevent the non rechargeable battery from being damaged.
Estimated range with 85 mAh battery: 800 hours minimum.