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using bq2014h

Rocket42
Prodigy 165 points
Other Parts Discussed in Thread: BQ2014H

hello, everyone

I am seeing bq2014h gas gauge for my application.But I don't understand what REF pin is?

In datasheet, "Battery Pack Application Diagram" , Can I remove module (consist of FET, Diode, Resistor R1, capacitor C1) connecting to REF pin?

  • 0
    TI__Guru 73830 points

    The recommended voltage on the VCC input is 4.25V. You can connect VCC directly to the cell, if you have a 1S configuration. If you have a 2S or higher configuration, then the stack voltage will be too high to connect directly to VCC. The REF output provides a reference voltage to use with an external FET to form a regulator to power the device. The external components are optional, if you have a 4.25V supply to power the device.

  • 0 in reply to ThomasCosby
    Prodigy 165 points

    thank you!

    I want to ask more that I want to use bq2014h to measure battery capability with following procedure:

    - install battery, load to circuit, not charger

    - write "0xFFFF" value to NAC registers. Then, press "Measurement" button.

    - after some time, read "current NAC register value"

    - we will calculate the battery capability = 0xFFF - "current NAC register value"

    Is that right?