The DRV8844 high logic-level input is 5.25V?

Otto Hunt

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.

over 9 years ago

0 Rick Duncan over 9 years ago

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 Otto Hunt over 9 years ago 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 Rick Duncan over 9 years ago 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.

Motor drivers

Motor drivers forum

The DRV8844 high logic-level input is 5.25V?