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Using BQ51013B with charger BQ24251, charge complete

Other Parts Discussed in Thread: BQ51013B, BQ24251

Is there a convenient way to interface the BQ51013B with the charger BQ24251 so that the charge complete message is sent without the use of a host processor?

The schematic in the BQ51013B data sheet Figure 4 shows a bq5101xB configuration with a charger, but the charge complete messaging goes through a host controller. It would be ideal if we did not have to power up the host during charging. 

~R

  • Do you expect the RX to disable the 5V output after the charging is completed? If this is the case, you may use /CHG or STAT pin of bq24251 to control EN1/EN2 pins of bq51013B. The RX will send the charge complete signal to TX when EN1/EN2 pins are both pulled high.

    However, to resume the charge when VBAT is below the re-charge threshold, you need to add some external circuit to control EN1/EN2 and enable RX again.

    Thanks,

    Wenjia