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DRV10970: Question for DRV10970

Annie Liu
Genius 10295 points
Part Number: DRV10970

Hi team,

The customer is experiencing below issue and needs your help.

1. In what form does the FG output speed feedback of the DRV10970 be output to the MCU?

2. For example, takes STM32 as an MCU. In what form does the FG pin output a signal to the MCU? How does the MCU handle this signal?

Thanks.

  • 0
    TI__Mastermind 19720 points

    Hi Annie,

    1. The FG signal will toggle once per electrical frequency of the motor. If you look at Figure 32 in the datasheet you can get a good idea of what the FG signal will look like.

    2. The FG signal is an open drain output meaning that it will toggle between what ever voltage you put the pull up resistor to and GND. You can use a timer on the MCU to determine the frequency of the FG signal and therefor the speed of the motor.

    Regards,

    Michael