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--- chumbyhackerboard:power [2010/08/30 16:59]
ladyada
+++ chumbyhackerboard:power [2011/05/10 21:15]
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@@ Line 24: / Line 24: @@
 The board can also use a standard 3.7-4.2V lithium ion/polymer battery for power. The board even has a built-in lipoly charger! It is activated by default and if you plug in a Lipoly battery you'll see the kernel recognize it and start charging at up to 500mA.
-If powering from a lipoly, the chip will boost it to 5V to supply power to one of the USB port s(the top one, on the same side as the power jack) but not to the other two.
+The Lipoly breakout is a [[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=455-1612-ND|JST B3B-EH-A connector]] on the same side as the power and A/V jack, next to the single USB port.
+To connect, use a 0.1" or 2.5mm spaced female socket - the official one is [[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=455-1001-ND|JST EHR-3]] and crimp the matching [[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=455-1042-1-ND|crimps]] on a red, yellow/white and black wire (28 AWG, stranded is best). Slip in the crimped wires so that the board markings match up such that red is +, T is yellow, and - is black. The markings are on the opposite side of the PCB
+{{:chumbyhackerboard:lipoly10k.jpg?500|}}
+If your battery does not have a temperature output, you can simply solder a 10K resistor between yellow (temp wire) and black (ground). You'll probably not need a temperature sensor but in case you do, use a 10K NTC.
+If powering from a lipoly, the chip will boost it to 5V to supply power to one of the USB ports (the top one, on the same side as the power jack) but not to the other two.  There is a fourth USB connection on the header where I2C and other DIO pins are - this one IS also powered by the lipoly boost system.
+The lipoly is also used for the RTC backup! Any lipoly battery, when charged, will let the RTC run for -years-

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