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TPL0401B-10-Q1: Can't receive the ACK bit during I2C communication

Sherry Liang
Genius 10255 points
Part Number: TPL0401B-10-Q1

Dear team,

When the customer tested the I2C communication, they found that there is no ACK signal. The I2C frequency is 25KHz. The waveform is as the first pictue(blue is the SCL, and the yellow line is the SDA). And the schematic is as the second picture. In addition, The H pin is floating in the schematic, but they have connectted this pin to the 5V power supply in the test. Could you please help analyze this problem?

Thanks & Best Regards,

Sherry

  • 0
    TI__Genius 14220 points

    Hi Sherry,

    Thank you for your query. The I2C address of TPL0401B is 0x3E. What you are providing is 0x1F. Note that the I2C addresses are specified in 7-bit format.

    Hope that answers your question.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC