• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 265 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

LMX2595EVM: LMX2595EVM is the LMX2594EVM?just the IC is different

DS90UB925Q-Q1: DS90UB925Q-Q1: reg ack signal is rase

Lei wang
Expert 1620 points
Part Number: DS90UB925Q-Q1

hi Sir：

MCU read/write  the cby I2C。 by I2C address,reg,data have  ack .But just the reg ack  logic low is not to 0V  The Vdd is =3.3V

  • 0
    TI__Mastermind 25955 points

    Hi Lei Wang,

    If the microcontroller in the above image is the master and the DS90UB925 is trying to ACK, please ensure that the I2C pins on the microcontroller are not set to push-pull outputs, but instead are configured as open-drain outputs.

    If this doesn't resolve the issue, please share more information such as pull up resistance, bus capacitance, number of devices on the i2c bus and i2c data rate.

    Sincerely,
    Bryan Kahler