BQ24257 ready state?

[rexxar]

Hi all, I'm using the BQ24257 Li-Ion charge controller in my project, but it's not working, and it's driving me crazy!

What's going on is that when I query the device over I2C for the charging status, it reports "ready". Thing is, the ready status isn't documented in any datasheet I can find. I seem to recall reading somewhere that "ready" means the device is powered up and waiting for a battery to be connected, but I don't remember where I saw that, and I can't find it again.

Weird thing is, I've gotten it to work a couple times. Last time it worked completely reliably, but once I uploaded some new code, it broke again. Of course it didn't work when I uploaded the old code... I did stick a logic analyzer on the I2C bus just to make sure my code isn't interpreting the data wrong, but that looks fine.

Anyone have any ideas?

[amyk]

What do the rest of the status registers say?

To me "ready" also means it's waiting to charge a battery.

[rexxar]

Here's the registers as I've got them configured:

0
00100000
01111011
0
00000010
00101000
00011000

[amyk]

Register 3 says "Apple/TT or non-standard adaptor detected". What do you have it plugged into? Try setting bit 4 in register #5 to tell it to re-detect. If it still won't charge, set bit 3 of reg #7 to force a battery detection and check the status in reg #1.