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iRiver iHP-120/140 USB charge with BQ24022

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ItsJustMe:
I would like to charge my player via USB (or at least stop it from discharging while plugged). The Li-Ion charger IC is a Texas Instruments BQ24022 which is capable of USB charge but this function is unused.

A look at http://focus.ti.com/lit/ds/symlink/bq24022.pdf tells me that I need to wire:

USB VBUS BQ24022 pin 2 (USB)
USB VBUS Ground, over capacitor (value?)
BQ24022 pin 7 (ISET2) Ground, over resistor (value for low charge rate?)
Some sort of over voltage protection?

At the moment i use the old mod (USB VBUS DC In +) already described in this forum but that does not look very elegant. For example charges are always interrupted on disk access.

Do you think it's possible to implement that?  ??? Help would be appreciated  :)

roolku:
I looked at this some time ago and abandoned the idea. Unfortunately I can't remember why. Maybe it will come back to me. If it works out I think this would be a cool mod.

Roolku

LinusN:
It should be possible. You need to lift the USB pin on the BQ24022 because it is currently connected to the DC-in, and then connect it to VBUS.

Davide-NYC:
I posted a link to this thread in the RTC mod thread so that maybe one of the hardware geniuses over there might be of some assistance. This would be a righteous mod!

roolku:

--- Quote from: roolku on February 08, 2007, 05:14:36 PM ---I looked at this some time ago and abandoned the idea. Unfortunately I can't remember why.
--- End quote ---

I now remember what put me off. The 0.5 mm pitch! That will take some courage to solder a couple of wires on.

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