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BQ24090: Functional test to ensure battery is charging

Santiago Gutierrez91
Prodigy 20 points
Part Number: BQ24090

Our goal is to design a functional test to ensure the charging circuit works. We want to make sure there are no problems charging the battery via USB. What is the best way to do this? This FCT is meant for a high volume product so minimizing test time is important. 

  • 0
    TI__Guru* 75656 points

    I will contact you

    Look for a contact request from me.

    The bq24090 has a number of user configurable pins and it would be difficult to recommend a test without reviewing the schematic.

  • 0 in reply to Bill Johns
    TI__Guru* 75656 points
    Rough outline of bq24090 high level test.

    1.) Constant Current Charge---Set by ISET resistor with ISET2 pin low, limited by ISET2 see data sheet.
    a. Set battery simulator voltage to 3.8V and verify that current at out meets target value.
    b. If ISET2 is used to reduce current set this pin High and Float to reduce output current
    c. /CHG pin will be low during this time

    2.) Constant Voltage Charge---Set by device should be 4.2V, recommend setting ISET2 Low
    a. Set battery simulator voltage to 4.1V to 4.2V and verify that current is reduce
    b. /CHG pin will be low during this time

    3.) Charge termination---Set by resistor at PRE-TERM pin to between 5% and 50%, 10% is typical
    a. Increase voltage and observe that current drops further verify that at termination value current stops and /CHG pin goes high Z (open drain)

    4.) Temperature Sense using TS pin—NTC in battery pack if used if not used then 10k resistor to disable
    a. A resistor of lower value can be used to simulate high temp and verify shutdown. Higher value resistor can be used to simulate cold temp and verify shutdown.
    b. This test will depend on the user configuration, often the NTC is in the battery pack.
  • 0 in reply to Bill Johns
    Prodigy 20 points
    It sounds like we still need the USB cable to be plugged in. And we need a battery simulator at our test facility to check the output of the battery charger. And obviously we need to check the state of the pins. Do I understand correctly?