SPI Communication

[saurabh_sharma]

I'm interfacing a thermocuple-to-digital converter operating at 3.3V to a MCU-S32K148 operating at 5V.

This converter is communicating via SPI. My  concern is whether communication at 3.3V level will be successfully accomplished or I need to add signal conditioning network in between?

[razva_tilimpea]

Hi,

S32K148 dev-kit works on 3.3V and on 5V. 

If you must keep S32k148 power supply to 5V and external device to 3.3V I recommend you to use level shifters because threshold for HIGH is 3.25V if you power the S32K148 to 5V.

Best regards,

Razvan