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en:pcf8563rtc [2017/01/22 17:47] odroid [Ubuntu] |
en:pcf8563rtc [2017/02/28 17:29] odroid [Estimated life cycle of the battery] |
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| <WRAP left round important 100%> | <WRAP left round important 100%> | ||
| ** Kernel update will break the RTC functionality **\\ | ** Kernel update will break the RTC functionality **\\ | ||
| - | To avoid this problem, you need to change the DTB file again \\ | + | To avoid this problem, you need to change the DTB file again after Kernel update \\ |
| <code>sudo fdtput -t s /media/boot/meson64_odroidc2.dtb /i2c@c1108500/pcf8563@51 status "okay"</code> | <code>sudo fdtput -t s /media/boot/meson64_odroidc2.dtb /i2c@c1108500/pcf8563@51 status "okay"</code> | ||
| </WRAP> \\ | </WRAP> \\ | ||
| Line 98: | Line 98: | ||
| 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> | ||
| + | |||
| + | ===== 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. | ||
