GTA02 RTC backup battery
From Openmoko
(Difference between revisions)
(→Alternatives:: more) |
(→Alternatives - untested:: more) |
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* DSK-3R3H224 (1000 Hrs @ 60°C) | * DSK-3R3H224 (1000 Hrs @ 60°C) | ||
* KS-3R3224 (1000 Hrs @ 70°C) | * KS-3R3224 (1000 Hrs @ 70°C) | ||
| − | * EDLEN204 (1000 Hrs @ 85°C) | + | * [http://www.cde.com/catalogs/EDL.pdf EDLEN204] (1000 Hrs @ 85°C), Long Life - 15 years |
[[Category:Neo FreeRunner reworks and mods]] | [[Category:Neo FreeRunner reworks and mods]] | ||
[[Category:Battery]] | [[Category:Battery]] | ||
Revision as of 21:02, 29 December 2010
RTC keeps the current time while Neo FreeRunner is off or suspended. Rechargable lithium backup battery should keep clocks running for hours when main battery is flat or removed, but it has limited lifetime.
Replace by capacitor
RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by electrochemical double layer capacitor (EDLC), like XH414H-II06E (apparently obsolete, not recommended for new design) or EECEN0F204 (500 Hrs @ 60°C) (datasheet). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.
- http://lists.openmoko.org/pipermail/community/2010-October/063559.html
- http://lists.openmoko.org/pipermail/community/2010-October/063657.html
Alternatives - untested:
(search digikey.com) ? What terminal type?:
- DSK-3R3H224 (1000 Hrs @ 60°C)
- KS-3R3224 (1000 Hrs @ 70°C)
- EDLEN204 (1000 Hrs @ 85°C), Long Life - 15 years
