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MSP432P401R: SPI logic level while interface with ADS1243

Ajay Khedekar
Prodigy 250 points

Part Number: MSP432P401R

Hello ,

I am interfacing ADS1243 with MSP432P401R through SPI communication ,micro controller is working on 3.3V and ADC is working on 5V Vdd; does i need level convertor between micro controller and ADS while communication via SPI.

  • 0
    TI__Expert 8510 points

    Ajay,

     The MSP432P401R does not have 5V-tolerant IO. The max voltage that can be applied to any pin is only 4.17v according to the MSP432P401R datasheet, section 5.1. Since the ADS1243 can output voltage above that, you'll need a level converter.   Note that you'll need conversions both ways, since the output voltage from the MSP432P401R is at most Vcc (3.3v) and the ADS1243 needs a minimum input voltage for a logic high of 0.8 * Vdd (= 4v).

    Regards,

      Bob Landers

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