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DRV8889-Q1: Motor drivers forum

TEZUKA FUMIKA
Prodigy 150 points
Part Number: DRV8889-Q1

Hello,

I'm concerned about whether noise to the VM pin will cause IC reset.

The Data sheet said,
"When the voltage on the VM pin falls below the VM UVLO reset voltage (VRST, 3.9 V maximum), SPI
communication is unavailable, the digital core is shutdown, the FAULT and UVLO bits are low and the nFAULT pin is high."

How long does it take to reset if the VM voltage is kept below VRST ?
I couldn't find the description of the data sheet.
Please tell me. Regards,

  • +1
    TI__Guru 55605 points

    Fumika-san,

    Reset time is ~20us, but this will be hard to measure as 3.9V is given at a maximum.  It is possible that the core resets at a voltage <3.9V. 

    We have not seen any issues with spikes causing unintentional reset especially with proper decoupling capacitors on the VM pins close to the IC.

    Regards,

    Ryan