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?
LiPo charger question
Started by ●May 25, 2016
Reply by ●May 25, 20162016-05-25
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
Reply by ●May 26, 20162016-05-26
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/
Reply by ●May 28, 20162016-05-28
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
