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LiPo charger question

Started by bitrex May 25, 2016
I have a little LiPo charger module, this one:

https://www.adafruit.com/product/1304

It's based on the following IC:

https://cdn-shop.adafruit.com/datasheets/MCP73831.pdf

There doesn't seem to be any breakout on the dev board provided to give 
a "power good" signal to a microprocessor when the battery is finished 
charging.

I'd like the host device to be un-turn-onable while the battery is 
charging from a USB port, and for the device to shut down when the 
battery voltage drops below a certain level. What additional circuitry 
would be required?
Den onsdag den 25. maj 2016 kl. 23.25.10 UTC+2 skrev bitrex:
> I have a little LiPo charger module, this one: > > https://www.adafruit.com/product/1304 > > It's based on the following IC: > > https://cdn-shop.adafruit.com/datasheets/MCP73831.pdf > > There doesn't seem to be any breakout on the dev board provided to give > a "power good" signal to a microprocessor when the battery is finished > charging. > > I'd like the host device to be un-turn-onable while the battery is > charging from a USB port, and for the device to shut down when the > battery voltage drops below a certain level. What additional circuitry > would be required?
there's two LEDs on the STAT pin for changing and done the stat pin is high when done, low when charging and high Z when not powered -Lasse
Lasse Langwadt Christensen <langwadt@fonz.dk> Wrote in message:
> Den onsdag den 25. maj 2016 kl. 23.25.10 UTC+2 skrev bitrex: >> I have a little LiPo charger module, this one: >> >> https://www.adafruit.com/product/1304 >> >> It's based on the following IC: >> >> https://cdn-shop.adafruit.com/datasheets/MCP73831.pdf >> >> There doesn't seem to be any breakout on the dev board provided to give >> a "power good" signal to a microprocessor when the battery is finished >> charging. >> >> I'd like the host device to be un-turn-onable while the battery is >> charging from a USB port, and for the device to shut down when the >> battery voltage drops below a certain level. What additional circuitry >> would be required? > > there's two LEDs on the STAT pin for changing and done > > the stat pin is high when done, low when charging and high Z when not powered > > -Lasse >
Gotcha. So how does this help me? -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/
On Thursday, May 26, 2016 at 7:45:43 AM UTC-7, bitrex wrote:
> Lasse Langwadt Christensen <langwadt@fonz.dk> Wrote in message: > > Den onsdag den 25. maj 2016 kl. 23.25.10 UTC+2 skrev bitrex: > >> I have a little LiPo charger module, this one: > >> > >> https://www.adafruit.com/product/1304 > >> > >> It's based on the following IC: > >> > >> https://cdn-shop.adafruit.com/datasheets/MCP73831.pdf > >> > >> There doesn't seem to be any breakout on the dev board provided to give > >> a "power good" signal to a microprocessor when the battery is finished > >> charging. > >> > >> I'd like the host device to be un-turn-onable while the battery is > >> charging from a USB port, and for the device to shut down when the > >> battery voltage drops below a certain level. What additional circuitry > >> would be required? > > > > there's two LEDs on the STAT pin for changing and done > > > > the stat pin is high when done, low when charging and high Z when not > > powered > > Gotcha. So how does this help me?
I'm guessing you use a buffer* to take the signal at the STAT pin of the charging module to the "power good" input on the dev board. * inverting or not, depending on what the "power good" needs to see, of course. Mark L. Fergerson