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BQ24773: standard programming sequence

Vincenzo Pizzolante
Mastermind 25676 points
Part Number: BQ24773


hi,

may you provide an even high level programming sequence / flowchart for the BQ24773?

we have a 2 cells / 8A charger to configure and we are struggling a bit with various problems, so we are looking for a source to refer to / look at

thanks a lot in advance

KR

Vincenzo

  • 0
    TI__Mastermind 25800 points

    Hey Vincenzo,

    To program the charger for 8A charging of a 2S system, please refer to the following:

    1) Make sure the schematic has been followed as specified in the datasheet.

    2) Apply a valid input voltage with a adequate power capability to handle the output power for a 8A charging plus any system load, accounting for the efficiency of the charging controller. 

    3a) The CELL pin should be set to float in order to set the default max charging voltage to 4.2V/cell. If your batteries have a different maximum voltage rating, please see 3b). If not, skip to step 4a).

    3b) Change the MaxChargeVoltage() register to your required maximum charging voltage. 

    4a) Set the InputCurrent() register to a value matching the input current limitation of your adapter/power supply from step 2). Setting this register current value any lower that required to handle 8A output current @ the maximum system voltage + the system load requirements will result in a lower charging current. Setting this any higher could result in your input source voltage drooping/crashing completely due to overloading, resulting in a charger POR. If you have set the ILIM pin to a setting lower than this register's setting, the input current will be limited to the ILIM pin value. To disable, refer to step 4b).

    4b) Disable the external ILIM pin function using the External ILIM Enable bit set to 0 in the ChargeOption2() register.

    5) Set the ChargeCurrent() register to your 8000mA setting. This is subsequently enable charge. 

    Regards,

    Joel H