BQ24005: charge done status

Gaurav Gothoskar

Part Number: BQ24005

Hello,

The STAT2 (green LED) turns on every time when the DC adapter is connected to the input. The STAT truth table shows that the green LED should turn on only at "charge done". The APF/THERM has the exact same resistor dividers as on the EVM. The charging and end of charge is normal.

The charger is connected to a host microcontroller and it is not able to distinguish the adapter connected state to the charge done state since the STAT2 stays on in both cases.

what am I missing?

Thanks,

Gaurav

over 5 years ago

0 Bill Johns over 5 years ago

TI__Guru* 75856 points

Hello Gaurav

I checked this in the lab with an evaluation board and it appears to work correctly, matched data sheet. BUT if no battery is connected and voltage is applied the STAT2 LED will turn on. The output capacitor charges up in this condition and meets charge complete requirement.

0 Gaurav Gothoskar over 5 years ago in reply to Bill Johns

Intellectual 585 points

got you. makes sense. Thank you.

Can you tell he the resistor values in the internal comparator that is used for UVP detection. what is the value of Vref?

I am marking the designaters as R1 to R5 in the picture below. please let me know that value of each along with Vref.

Thank you,

Gaurav

0 Bill Johns over 5 years ago in reply to Gaurav Gothoskar

TI__Guru* 75856 points

Hi Gaurav

We will have to contact the design team for this info, due to the age of this part this will take some time.

Is this for an external UVLO design?

0 Bill Johns over 5 years ago in reply to Bill Johns

TI__Guru* 75856 points

Hi Gaurav

Are you looking for this info for an external UVLO circuit?

The range of the resistor value are large but matched to each other.

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BQ24005: charge done status