>
>> Are there any single chip NiMH chargers around? All the single chip
>> chargers I find are Li-Ion. I used one of the LTC Li-Ion chargers in one
>> project, and it worked out well. I'm working on another project now
>> using
>> NiMH. So far I have the PIC controlling the charging.
>
> I'm not sure how you are searching. Maxim has several, DS2714 for
> example.
>
> They also have "fuel gauges" to take care of figuring out come much
> capacity you've got.
>


Thanks for the info on the DS2714. I guess I missed it before because of
the big red "NEW!" that's next to it now (the part probably did not exist
when I was looking for a NiMH charger). It is an interesting part. I
wonder why they didn't put the switching transistors inside the chip using
low side switching. That would save us some parts! It's also designed for
"loose cells" instead of "in circuit" charging. We could remove the load
while charging in circuit, but we're running a series set of cells, which
this chip would not support. Finally, my client has asked me to redesign
their product to not use Maxim parts because of the difficulty they've had
getting those parts. They're afraid another shortage will put them out of
business. So... I'm in the middle of a redesign. I'll have the PIC doing
the NiMH charging, using the flat voltage termination method.

Harold

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