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AM3352 I2C I/O Level

Dong Hui
Prodigy 220 points
Other Parts Discussed in Thread: AM3352

For AM3352, all I2C ports are located on VDDSHV6 power domain. In my design, I need to configure VDDSHV6 to 1.8V. Can I still pull-up the I2C port to 3.3V to communicate with other peripherals?

  • 0
    TI__Guru**** 393215 points
    No, they must be pulled up to VDDSHV6. AM335X I2C ports are not true open-drain, they are standard I/O cells.
  • 0
    TI__Guru 62995 points
    No.

    Please look at the “Steady state max voltage at all IO pins” parameter shown in the Absolute Maximum Ratings Table of the data sheet. The maximum voltage potential defined by this parameter is “–0.5 V to IO supply voltage + 0.3 V”. Read Note 8 associated with this table for more information.

    So the maximum voltage than can be applied to any of the IO pins powered by VDDSHV6 will be 2.1 volts when VDDSHV6 is operating at 1.8 volts.

    Regards,
    Paul