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en:pcf8563rtc [2017/01/22 17:48] odroid [Ubuntu] |
en:pcf8563rtc [2017/02/28 17:29] odroid [Estimated life cycle of the battery] |
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| To stop ntpd: <code> sudo /etc/init.d/ntp stop </code> or <code> sudo service ntp stop </code> | To stop ntpd: <code> sudo /etc/init.d/ntp stop </code> or <code> sudo service ntp stop </code> | ||
| To prevent it from starting at boot: <code> sudo update-rc.d -f ntp remove </code> | To prevent it from starting at boot: <code> sudo update-rc.d -f ntp remove </code> | ||
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| + | ===== Estimated life cycle of the battery ===== | ||
| + | We cleanly installed Android 5.1 V3.3 image and measured the power consumption.\\ | ||
| + | When C2 turns on, it consumes less than 1uA.\\ | ||
| + | When C2 turns off, it consumes around 15uA.\\ | ||
| + | |||
| + | According to CR2032 Panasonic datasheet, its nominal capacity is 225mAh.\\ | ||
| + | [[http://www.cr2032.co/cms/prodimages/panasonic_cr2032_datasheet.pdf]]\\ | ||
| + | So its backup time could be around 15000 hours (~ two years).\\ | ||
| + | If on/off ratio is 1:1, it can be 3~4 years. | ||
