• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 29 subscribers
  • Views 1051 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

The DRV8844 high logic-level input is 5.25V?

Otto Hunt
Expert 1475 points
Other Parts Discussed in Thread: DRV8844, DRV8844EVM

The DRV8844 data sheet lists the logic-level input high as minimum 2.2V and maximum 5.25V. How can I be sure that I can switch this chip using a 3.3V microcontroller? Please advise.

  • 0
    TI__Guru** 114905 points
    Hi Otto,

    There should be no problem using a 3.3V mcu. The DRV8844EVM uses a 3.3V mcu to control the DRV8844.

    The inputs of the DRV8844 are high impedance (typically 100kOhm). A 3.3V mcu can easily drive the inputs to almost 3.3V, well above the 2.2V minimum.
  • 0 in reply to Rick Duncan
    Expert 1475 points
    Thanks, Rick, for your fast reply. In most design, of course, we engineers like to err on the conservative side. We can design to typical specs, but the outliers can bite us or otherwise cause nightmares. So my question remains, what is a logic-level input high of 5.25V doing (trying to tell me) on the data sheet?
  • 0 in reply to Otto Hunt
    TI__Guru** 114905 points
    Hi Otto,

    The 5.25V is there to indicate the device will also work with 5V microcontrollers.