I think that was the chip I encountered in an APC battery pack for my old
Compaq 1237 Laptop.  It uses a NiMh pack. The problem turned out to be
getting the initial state of the battery to match what the chip expected.

I decided that one condition that should be expected was a battery that had
shelf discharged. I removed the battery cells, cycled them a couple of times
on a charger, discharged them, reinstalled in the pack charged it in the
computer, ran it down with the computer, recharged and it worked. I stopped
there!
Good luck!

John Ferrell
http://DixieNC.US

----- Original Message -----
From: "Philip Pemberton" <philpem@DSL.PIPEX.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, February 23, 2004 9:31 AM
Subject: [EE]: TI Bq2014 problems


> Hi,
>   Well, it seems that no matter how hard I try, I can't get my Bq2014
battery
> monitor chip to behave.
>   According to the data sheet, every time the battery is run flat,
> recharged and run flat again, the Bq2014 is supposed to count the amount
of
> current that was discharged from the battery and then use that to update
the
> LMD (Last Measured Discharge) register.
>   Now, herein lies the problem. The LMD register is used to calculate the
> full-scale count for the gas-gauge LED display. In other words, if LMD is
100
> and NAC (Nominal Available Charge) is 25, then the battery is 25% full.
This
> is used to calculate how many LEDs need to be turned on when the /DISP pin
is
> connected to ground.
>   Is there some magic incantation I need to send to the Bq2014 to get it
to
> update the LMD? Has anyone else even attempted to use one of the Benchmarq
> (well, TI now) battery monitor ICs? A little help would be really useful
ATM.
>
> Circuit specs are:
>   Battery: 500mAh 3.6V (3-cell) Nicad
>   Sense resistor: 0.2 Ohm
>   Charge current: 50mA
>   Max output current: 200mA
>
> Thanks.
> --
> Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB,
6GB,
> philpem@dsl.pipex.com              | ViewFinder, 10BaseT Ethernet,
2-slice,
> http://www.philpem.dsl.pipex.com/  | 48xCD, ARCINv6c IDE, SCSI
> ... If I save the whales, where do I keep them?
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>

--
http://www.piclist.com hint: The PICList is archived three different
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