Doubts on Nucleo-H753ZI

naveen_kumar · ‎2023-01-13

I'm interfacing Nucleo-H753ZI with DAC8775EVM through SPI4.

DAC8775EVM works on logic HI in range of 5V and expects the same logic from Nucleo-H753ZI

but Nucleo-H753ZI MCU itself runs at 3.6V so Logic Hi isn't read by DAC8775EVM.

How to Change the logic level "HI" of SPI4 in Nucleo-H753ZI?

Thanks in Advance.

Regards,

Naveen

Peter BENSCH · ‎2023-01-13

Hi Naveen,

The level of the SPI signals can be converted between 3.3V and 5V using a level shifter.

Does it answer your question?

Regards

/Peter

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naveen_kumar · ‎2023-01-13

Hi Peter,

Is it possible to use microcontroller SPI pins to pull up to +5v and use them instead of level shifters. We are preferring this method as the Hardware is designed without Shift registers already.

Regards,

Naveen.

Tesla DeLorean · ‎2023-01-14

Check if the pins in question are FT (5V tolerant) per Data Sheet.

If they are you can use a pull-up and Open-Drain mode for the output.

Check what the reported VIH threshold is for DAC8775 really is, vs level seen on pin/connection.

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