BQ24105: BQ24105 , charge not complete

Correct, MCU only reads the STATx pins. The MCU does not change the status itself.

Please confirm the lines connected to the MCU. The shown pins do not line up with the datasheet. What is the ADC pin?

I answer your power point questions below.

1. You setup your TS pin and thermistor so that the specified temperature range is followed. The charger will suspend charge when the TS pin is outside of the set temperature range. See Section 8.3.2 of the datasheet.

2. The battery voltage is checked using a voltage divider to the ADC of the MCU.

3. The MCU will keep track of the time.

4. The BQ24105 charge timer is counting.

Thanks,

Mike Emanuel

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Hello,

You do not need the MCU to check the temperature unless you want to. The charger will force both STATx pins off in case of a temperature fault. The MCU can read the STATx pins and start a timer.

In response to the different temperature values, please look at the difference between VHTF and VTCO. The window to initiate charge is narrower than the window to continue charge. We were recommended by FDK to check for 50C initially, and then 60C later. So you have two options:

1. Set the window to initiate charge from 0 to 50 C.

2. Sense the TS pin with an MCU to achieve the different 0 to 50 C and 0 to 60 C windows.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.