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DRA722: I2C pull-up register value

Takeo Sekiguchi
Expert 3305 points

Part Number: DRA722

Hello,

Now using 10kohm PU register on I2C lines, based on VOL and Idrive specification in data manual and EVM's I2C pull-up register value.

However, the actual measurement on the board, tr timing value was 600nsec and not meet the fast speed tr specification (max 300ns).

Is there any recommended PU register value of I2C (fast speed)?

Regards,

Takeo

  • 0
    TI__Guru 57837 points

    Takeo-san,

    The required resistor value will depend on the PCB capacitance.  You should experiment to reduce the resistor value to find the appropriate rise time.  It sounds like 5k may work for your needs.

    Thanks,

    Kyle