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Bq24160 Charge termination

Nasir Alfarid
Prodigy 100 points
Other Parts Discussed in Thread: BQ24160

under what all conditions the charge termination condition will not work ? we have set termination current at 150 ma and battery voltage max at 4.18 v.TE bit is enabled.Still we have seen that charge current is going upto 5 ma and battery is still charging.The charger ic we are using is Bq24160 and fuel gauge ic BQ27520G4  

  • 0
    TI__Guru**** 166956 points
    Nasir,

    bq24160 termination is auto disabled if TS is WARM or COOL or if input current limit is 100mA. Most customers using a gauge and charger, disable termination by the charger and rely on the gauge to terminate charge.
  • 0 in reply to Jeff F
    Prodigy 100 points

    Thanks Jeff for your reply.We are thinking to monitor with charger IC and Fuel Gauge both.Charger IC will terminate the charging and fuel gauge will also monitor the voltage.Let us know whether its a good design.Fuel gauge will disable charging at 4.18 v and enable charging at 4 volt.

    We have another issue.Our battery thermistor and battery two pins can be disconnected together.So if battery not present we only get thermal fault.How to detect battery not present in this scenario?

  • 0 in reply to Nasir Alfarid
    TI__Guru**** 166956 points
    Nasir,

    Your schematic did not come through on private message. Maybe it blocks png files? Are you using the temp sense function of the gauge (you can't connect both the charger TS pin and the gauge temp sense pin to the same thermistor)? The gauge temp sense is more accurate. If so, then you can disable the charger's TS function of the bq24160 either through I2C resistor or by tying it to DRV. Once the TS function is disabled, the battery detection circuit will properly indicate battery not detected.
  • 0 in reply to Jeff F
    Prodigy 100 points

    Hi Jeff,

    Thanks for your reply.I will send you schematic of battery charger and fuel gauge very soon.

    I have another issue to discuss with you.While disconnecting the charger/adapter every time I am getting adapter fault for weak signal.is this a hardware issue or anything related to battery charger IC behaviour. Our requirement is to detect faulty/damaged adapter. How to achieve this please guide us.

  • 0 in reply to Nasir Alfarid
    TI__Guru**** 166956 points
    Hi Nasir,

    The bq24160 has bad adapter detection. At first power attach, it tries to pull a certain amount of current from the adapter and if the input droops, it assumes the adapter is weak (bad).
  • 0 in reply to Jeff F
    Prodigy 100 points

    Hi Jeff

    We are getting the weak fault during removal of adapter. Let me know if we need to do any configuration to avoid this situation.