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BQ24650 STAT1 Pin Usage

Jeramie Bianchi
Expert 3315 points
Other Parts Discussed in Thread: BQ24650

Hi,

I want to interface the bq24650 STAT1 output to a PIC32 microcontroller: The microcontroller does not support anything above a 3.3V level. What is the recommended method of performing this? I was thinking of removing the LED (from the reference schematic) and instead connecting STAT1 directly to an ADC pin on my micro. Then just installing a pull up resister from STAT1 to the regulated voltage (after the batter voltage is regulated) of 3.3V. I am also interested in monitoring the charge level of the Battery. Is there an application note to assist with this?

Any recommendations or guidance is appreciated.

Regards,

Jeramie

  • 0
    TI__Mastermind 36110 points

    The bq24650 datasheet shows the STAT1 and STAT2 pins to be open collector. You can connect them to any voltage of your choice as long as you don't violate the pins' the abs max specs in the datasheet.  Your uP supply voltage would be a good choice.

    TI's gas gauge ICs are designed to monitor the charge status of a battery.  The bq24650 charger will not perform this function.  You can reivew your gas gauge choices at www.ti.com then click on Power Management.  You'll need to have more details on your battery chemistry, capacitity, configuration, etc before you can select a gas gauge.