A2B AD2428W I2C DOESN'T WORK IN ADAZ-2428MINI SINGLE BOARD

Hello

Here We Bought 2 ADZS2428MINI Board Without I/F Board And DSP System Board. What We Would Have Planning For This Is To Use Another MCU Control Board As Master. This Didn't Go Smooth.When We Tried To Wire Out The I2C With Our Control Board We Found I2C Was Not Alive At All After Applying Oscilloscope To Measure. Looks Like ADZS2428MINI Requires To Be Boot From External I2C EEPROM / Host When We Downloaded The Schematic To Check. But That's Not Reasonable For Some Cases Which Are Not Designed With External I2C EEPROM Due To The Cost Problem. The Problem We Find Is I2C Required To Be Enabled By Byte 5 / BIT 0 Otherwise The ADAZ-2428MINI Cannot Work. The Real Problem Is That Once I2C Should Be Enable By Byte 5 / BIT 0 Bit Value Setup Through External I2C EEPROM How Can We Drive EEPROM Through I2C Bus. 

What We Bought

We Tried To Wire Out The I2C In Connection With Our Microcontroller EVK For Initialization But I2C Didn't Work At All. Then We Checked The User Manual Found Following Companion Board:

We Don't Know Why Exactly And The Root Cause That Make I2C Not Work. It Is Not Reasonable Even We Don't Have The ADZS-EZKIT-SOM And DSP Board The I2C Interface Should Work.

Bright



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[edited by: bright at 11:26 AM (GMT -5) on 3 Feb 2021]
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  • Hi Bright,

    Regarding,"I try to measure the SDA/SCLK of I2C always near to GND, it shout be 3.3V, isn't it?"
    >> Yes. Since you are connecting the IOVDD jumper as  (PIN 2-3 of P3), you can expect 3.3v at SCL/SDA.
    So you do you mean that when measuring the I2C line voltage in both board you find it always as Zero volt or near to Zero Volt ?

    If yes, could you please confirm that whether in board the power is supplied properly to the AD2428 or not. Please probe at C49 capacitor to confirm the regulator supplied a 8.5V input via A2B_VBUS and also confirm the same that by probing at the C10 capacitor as the supply on the A2B_VBUS is reached properly to the AD2428.

    Could you please verify were you able to measure the 3.3v at P3 Jumper's pin 3, so we can confirm the I2C lines are properly pulled-up.

    Regards,
    Dinesh

  • We're Now Days Off For Chinese New Year Holiday Here. Will Get Back To Reply You After 18TH.

    Regards

    Bright

  • Dinesh, 

    So you do you mean that when measuring the I2C line voltage in both board you find it always as Zero volt or near to Zero Volt ?

    ANS: 0V

    could you please confirm that whether in board the power is supplied properly to the AD2428 or not. 

    ANS: 8.5V @ C49

    Could you please verify were you able to measure the 3.3v at P3 Jumper's pin 3, so we can confirm the I2C lines are properly pulled-up.

    ANS: Before shorted PIN 2 and PIN 3, I get 3.3V, if I connect the PIN 2 and PIN3 together, the voltage is 0V.

    BR 

    JBLIOU

  • Hi Bright and JB,

    Thanks for providing the details. Could you please get back to me on the below points also to isolate the issue further.

        1. Could you confirm that P4 jumper is installed at 2&3.
        2. Please Monitor VIN,VOUT1, VOUT2 & IOVDD before and after connecting the external I2C signals from your main board.
        3. Without board being powered ON, can you check the resistance between IOVDD pin of AD2428 to GND using a multi-meter. It should be >1Kohm.

    Regards,
    Dinesh