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DRV8885: set the TRQ High-Z

NAOKI AOYAMA
Guru 11215 points
Part Number: DRV8885

Hello,

It may be not related directly this device.

Our customer use the DRV8885.

The customer set the TRQ using I/O port of an MCU.

When the customer set the TRQ Hi-Z, the voltage of terminal is middle level.

A middle level voltage cause to rush current at I/O port.

Do you have any idea for set the TRQ Hi-Z?

Should the customer use analog output port of an MCU?

Best Regards,

Naoki Aoyama 

  • 0
    TI__Guru** 114905 points
    Hi Aoyama-san,

    You are correct. There could be additional current flowing in the mcu if the gpio is set to high-z.

    This current should be minimal, but there are a few options if the current is a concern:
    1) Use the analog io that allows the input to be disabled
    2) Add an external tri-state buffer. This requires an additional GPIO to control the enable of the tristate buffer.
  • 0 in reply to Rick Duncan
    Guru 11215 points
    Hi Rick-san,

    Thank you for your fast reply.
    I will feedback the customer this information.

    Thanks,
    Naoki Aoyama