I have a microcontroller (ATmega328) that runs on 5V and another chip (MAX31855), connected via SPI as a slave (that only using the MISO line), that runs on 3.3V.
- Do I need to convert the output of the slave from 3.3V to 5V?
- The chip select pin (active low) is held high via a pullup resistor connected to 3.3V. Is this a problem since it is also connected to the 5V uC? I assume so, yes? Would I need to use a logic level converter for that as well?