From: David Vescovi <dvescovi@ta...> - 2006-03-31 11:23:26
The +vbat is tied directly to the power connector center pin (+4V or +5v
depending on wall wart) and is distributed to all the connected boards as
input to their local (3.3v) regulators.
The -vbat is looped through the power connector in a way that disconnects
the -vbat when the power connector is plugged in. I.E. when the power
connector is plugged in the battery is disconnected by breaking the -vbat
lead. The battery will not be charged by this scheme.
[mailto:gumstix-users-admin@...] On Behalf Of Kevin Worth
Sent: Thursday, March 30, 2006 12:54 PM
Subject: [Gumstix-users] Powering the gumstix with AA batteries
I've never been quite clear on these questions, so I thought I'd ask before
I burn something up-
If I want to use 3 AA batteries (4.5V) to power the gumstix, do I just
connect to the power jack or do I need to use VBATT or something?
Also, do I need any resistors or anything to limit current?
Also, is there charging logic built in to the current breakout-gs, or is
VBATT just an alternate source of power? i.e. could I connect 3 rechargeable
batteries to VBATT and then when I connect VCC (AC power
supply) would it charge it?