I would like to find a "off the shelf" circuit which can charge a 2 cell lithium ion back from a 5V source at a rate of 2.5A-5A. I also need to be able to monitor the state of charge via I2C (a fuel gauge) or just a low voltage switch (i.e a single signal that I can read on a GPIO pin). So far i have found two IC which can do the job, charging: TI BQ24618 or BQ24133, Monitoring: TI BQ40Z50 with a reference manual of 241 pages... I just want to know if the unit have to be charged, if its charging and if its done charging.
I could design my own circuit but time is short so if i could find one module or different once that i could put together would be great.

 

Could always consider a Bluetooth implementation of the gauge -

https://github.com/cypresssemiconductorco/PSoC-4-BLE/tree/master/100_Projects_in_100_Days

Or use ESP8266 or ESP32 to do a web based gauge. Google "esp8266 battery charging gauge",
many hits.

Regards, Dana.

 

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