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iRiver iHP-120/140 USB charge with BQ24022
ItsJustMe:
@LinusN
Are you shure? I thought the USB pin (pin 2) is just unused. Hm, that does not make sense to me.
@Davide-NYC
Thank you. I just ordered a DS3231 because I would like to do both modifications. :D
@roolku
You are right. That would be a challenge. ;D
LinusN:
--- Quote from: ItsJustMe on February 09, 2007, 08:20:57 PM ---@LinusN
Are you shure? I thought the USB pin (pin 2) is just unused. Hm, that does not make sense to me.
--- End quote ---
I saw this when I traced the PCB in the beginning of the project, and I was equally confused. I just traced it again, and now they aren't connected...!!! I guess I was tired that day.
So, the good news is that they are *not* connected. Sorry for the confusion.
syrou:
I find this mod very interesting (as much as the RTC one). I'm not sure, but maybe making a bridge between USB conn pin 1 and pin 2 of BQ chip, and grounding pin 4 of USB conn (if it isn't already) works. Is BQ pin 7 important?
Davide-NYC:
Guys any news on this?
I have a broken H120 I will be trying to fix in the next couple of weeks (need to find time) and would be willing to "try stuff" on it if I get the unit working.
In other words: If I can get it to work I'm willing to risk breaking it again. :)
Lemme know.
ItsJustMe:
--- Quote from: syrou on February 21, 2007, 04:52:27 PM ---I'm not sure, but maybe making a bridge between USB conn pin 1 and pin 2 of BQ chip, and grounding pin 4 of USB conn (if it isn't already) works.
--- End quote ---
Pin1 is DC in, pin 2 is USB in. A bridge does not make sense to me. USB in is limited to 500mAh and could be destroyed. I don't know what would happen if both USB and DC are connected. USB pin 4 (Ground) should be grounded anyway.
--- Quote from: syrou on February 21, 2007, 04:52:27 PM ---Is BQ pin 7 important?
--- End quote ---
As long as pin 7 is in "high-z" state, USB charge function of BQ is disabled. A pull up gives 500mAh charge current, pulled down we have 100mAh. A resistor between 10k and 100k should be fine (i am not shure).
My DS3231 arrived, perhaps i will try both mods soon but i'm afraid of the 0.5mm pitch. :o
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