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June 7, 2011
about 8 years ago
As I mentioned above, I believe the connector needs 4 solder points for the frame as shown in http://www.hirose.co.jp/cataloge_hp/e24200011.pdf
The image above http://dlnmh9ip6v2uc.cloudfront.net/images/products/10217-01.jpg shows only two solder points. It also seems that the connector is mounted too far out from the PCB edge, which is convenient for mounting in a case, but makes it even weaker.
I added the extra two pads to my Eagle device layout and it is much more sturdy now. I am happy to send you guys my layout.
The charge chip is a standard 4.2V chip and works well. You cannot judge the battery charge condition just by the idle voltage...
The micro USB may be giving some people trouble because the solder pattern has only two solder points for the case. If you look ate Hirose's catalog (e.g., Page 6), they use four solder points: http://www.hirose.co.jp/cataloge_hp/e24200011.pdf . After one of my connectors came off, I added the extra two pads to my Eagle device layout. It is much more sturdy now.
Are there any issues with driving the load from the charge output of the 78831? As it senses and controls charge current (precondition etc), it would seem that an additional load would cause an incorrect charge current. Switching power via shottky / mosfet would be cleaner?
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