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BQ24617: Status bits when using battery simulator

MA3000
Prodigy 50 points
Part Number: BQ24617

Hello,

In a test JIG used for testing the charger, one of the test modes is charging termination.

This is done by using a sink source PS set to CC at 0.1A. 

The status bits of the charger indicates that the battery is either absent or timer expired.

A fixed resistor is connected to the THERM (12Kohm). The charger is enabled.

During charging mode the status bit provide correct indication.

Any idea what am I dong wrong? 

Thank you in advance,

                                          Meir

.

  • 0
    TI__Genius 10240 points
    Meir,

    It would be better to use a real battery to repeat the test. There are possible two reasons for your case using battery simulator.
    - You need to take the termination current sensing accuracy into consideration. The accuracy of the termination current is +-45% with 1.5mV sensed voltage on the current sensing resistor (datasheet Page 8).
    - You stated that a fixed resistor is connected to the THERM (12Kohm). I think you meant that a fixed resistor of is connected to the TS. The TS needs to be biased in between 37.8% to 72.5% of VREGN_REG as reporting the normal temperature of the battery. Connecting the resistor without the bias network form REGN would not work (refer to Figure 15).