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DRV8912-Q1: About nSleep pin

Michael Jeong1
Expert 2600 points
Part Number: DRV8912-Q1

Hello,

I want to know about below items.

1. Internal pull down resistor value of nSleep pin.

    There is no comment on the data sheet.

2. Can I control nSleep up to 40 devices with 1 GPIO of MCU?

    I tested it with this condition. at this time, nSleep voltage is about 2.5V.

    But, these devices is not normal operating.

    Could you give me some guide what's the root cause?

Best Regards,

Michael

  • 0
    TI__Genius 13455 points

    Hi Michael,

    1.  The internal pull down on nSleep will typically be around 100K ohm.  You can back-calculate this based on the nSleep IIH spec in the datasheet.  Most of that current will be due to the internal pull down.

    2.  You should be able to control up to 40 nSLEEP pins with one GPIO - looks like this should only take 1-3mA, again based on the IIH spec of nSLEEP.  2.5V should be high enough, assuming VDD is 3.3V.  Logic high for nSleep (VIH) is 0.7 * VDD, or 2.3V in the case  VDD = 3.3V.

    Is the VM supply up when nSleep is driven high?  Can you query any of the SPI registers?

    Regards,
    Mike