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MSP430FR5949: IO threshold voltage level

Part Number: MSP430FR5949

Hi team, 

We have MCU connected to the MSP430FR5949 with 2.3Vhigh IO levels. 
The VCC of the MSP430FR5949 connected directly to a Coin Cell Lithium battery (~3V). 

Do you see any risk with our  IO voltage level? 

In MSP430FR5949 datasheet the threshold is 2.25Vmax


  • Hello,

    The voltage difference here is 0.05V (~2%), which does concern me a little. If the voltage never drops lower than 2.3V, then everything should work correctly. However, real-world applications are rarely ideal, so I would assume there's a significant risk that the VOH from the other MCU could drop below 2.25V. See SLAA148 for creative ways to deal with different signal voltage levels.