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MSP430F5229: 1V8 I/O Launchpad

Laure Chevallier
Prodigy 250 points
Part Number: MSP430F5229
Other Parts Discussed in Thread: MSP430FR2433, MSP-EXP430FR2433,

Hello,

I am working with an ADC that needs to be configured with an 1V8 SPI interface.

I tried using the SPI with the MSP430FR2433 launchpad with 1.9V supply and the SPI digital outputs go slightly higher than 2.1V:

These values are too high for the ADC.

I saw that the familly MSP430FR52xx have special 1V8 I/O so it would be perfect for this application but I can't find any development kit for this family similar to the MSP-EXP430FR2433.

Is there any MSP430 launchpad that has the 1V8 I/O feature ? What would be the easiest way to configure the ADC ?

Thanks and regards, 

Laure 

  • +1
    TI__Guru 60181 points

    Hi Laure,

    Unfortunately, there is no Launchpad for the MSP430F5229. 

    It sounds like the ADC is powered at 1.8v, correct? If you are truly powering the FR2433 Launchpad with 1.9v, the SPI pins should never be higher than 1.9v, something is not wired up correctly if you are seeing 2.1v.

    Typically I2C would be used in this type of interface because the IO pins can be configured as open-drain pins and pulled up to the ADC's 1.8v.

    Does this ADC support I2C or only SPI?

  • +1
    Guru 33653 points
    Laure Chevallier said:
    I saw that the familly MSP430FR52xx have special 1V8 I/O so it would be perfect for this application

    Don't know about special 1.8V I/O (didn't check FR52xx datasheet), but FRAM devices can not start  after reset / power up at 1.8V VCC. They must be started at higher voltage (close to 2.0V), and than voltage can go down to 1.8V.

  • 0 in reply to Dennis Lehman
    TI__Prodigy 250 points

    Hi Dennis, 

    Thank you for your answer. I checked with a more precise oscilloscope and the values are not higher than 1.9V so it should work.

    The ADC only supports SPI.

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