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+---- Thread: Battery boost circuit (/showthread.php?tid=222)
Battery boost circuit - stephen fleming - 01-29-2016
I assume there is a voltage boost circuit to power the board from the Lithium battery, and I would like to know what is the current limit for the boost circuit?
RE: Battery boost circuit - tllim - 01-29-2016
(01-29-2016, 01:45 PM)stephen fleming Wrote: I assume there is a voltage boost circuit to power the board from the Lithium battery, and I would like to know what is the current limit for the boost circuit?
Maximum charging current is 2800mA. For more info, please refer to AXP803 datasheet: https://drive.google.com/file/d/0B0cEs0lxTtL3bXcwU1p5aGJCR2s/view
RE: Battery boost circuit - stephen fleming - 01-29-2016
What I want to know is how much power could be supplied by the battery. The reason is that I am considering connecting up a small stereo amp like this and a couple of small speakers:
https://www.adafruit.com/products/1712
I plan on using the 8000mAh accessory battery.
I changed my mind and decided to use one of the hifi boards that I here are being designed for the Pine 64.
RE: Battery boost circuit - adk_mechetech - 02-04-2016
So I browsed through the datasheet for the chip and it looks like everything is configured by data registers.
Will there be a software option to configure these specific to the battery we want to use? (ie. 1A+ charge current for high capacity batteries)
Obviously the chip supports up to 2.8A charging, but thermal management becomes an issue. What is the functional limit due to lack of active cooling?
RE: Battery boost circuit - tllim - 02-04-2016
(02-04-2016, 06:55 AM)adk_mechetech Wrote: So I browsed through the datasheet for the chip and it looks like everything is configured by data registers.
Will there be a software option to configure these specific to the battery we want to use? (ie. 1A+ charge current for high capacity batteries)
Obviously the chip supports up to 2.8A charging, but thermal management becomes an issue. What is the functional limit due to lack of active cooling?
Current there is no software option to do so due to reliability concern. Just like you have mentioned, if somebody just crank up the charging current without knowing the consequence, it can become a disaster.
RE: Battery boost circuit - adk_mechetech - 02-04-2016
(02-04-2016, 11:20 AM)tllim Wrote:(02-04-2016, 06:55 AM)adk_mechetech Wrote: So I browsed through the datasheet for the chip and it looks like everything is configured by data registers.
Will there be a software option to configure these specific to the battery we want to use? (ie. 1A+ charge current for high capacity batteries)
Obviously the chip supports up to 2.8A charging, but thermal management becomes an issue. What is the functional limit due to lack of active cooling?
Current there is no software option to do so due to reliability concern. Just like you have mentioned, if somebody just crank up the charging current without knowing the consequence, it can become a disaster.
What is the charge current set to by default? Will there be any way at all to access the control registers or modify firmware to change it? (not an app that any user could install and mess with).
RE: Battery boost circuit - tllim - 02-04-2016
(02-04-2016, 02:44 PM)adk_mechetech Wrote:(02-04-2016, 11:20 AM)tllim Wrote:(02-04-2016, 06:55 AM)adk_mechetech Wrote: So I browsed through the datasheet for the chip and it looks like everything is configured by data registers.
Will there be a software option to configure these specific to the battery we want to use? (ie. 1A+ charge current for high capacity batteries)
Obviously the chip supports up to 2.8A charging, but thermal management becomes an issue. What is the functional limit due to lack of active cooling?
Current there is no software option to do so due to reliability concern. Just like you have mentioned, if somebody just crank up the charging current without knowing the consequence, it can become a disaster.
What is the charge current set to by default? Will there be any way at all to access the control registers or modify firmware to change it? (not an app that any user could install and mess with).
The PMU datasheet AXP803 already published in Pine64 wiki site, yoy also welcome to check out. I don't have the default charge current info handy and will publish when received.