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UCD90160: UCD90160 and TPS65273V are not responding on PMBUS

Alex Wong
Prodigy 180 points
Part Number: UCD90160
Other Parts Discussed in Thread: TPS65273V

Hi TI team,

I have built an evaluation board with 2xUCD90160, 3xTPS65273V for my project and debugging with TI tools

My first issue is devices are not responding on GUI

my board is referencing PMP9444 and provide power for FPGA and DRAM

I have set the UCD90160 address as 0x65'h and 0x66'h, one of TPS65273V address is 0x60'h on the same PMBUS

2x TPS65273V on another PMBUS with address 0x61'h and 0x62'h

However, only 0x62'h found ACK on GUI debug interface, all other devices cannot be found

I have checked the resistors are correct value. Or I remove UCD90160 ADDR0/1 resistor setting default address 126'd but still found no device

My second question is TPS65273V is hardware shutdown when start up, do they still respond to PMBUS?

can I pre-config its output value before enabling it?

I attached my project schematic for reference.

Thanks a lot.

UCD90160 and TPS65273V are not responding.pdf

  • 0
    TI__Guru 60800 points

    Hi

    Before answering your question, it is good to keep one post for device so that different group can better support and help. 

    Have you probed the V33A/V33D/BPCAP/RESET/SCL/SDA pin from both UCD90160 to ensure that the device is power up?

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 180 points

    Hi yihe,

    Thanks for reply. I will open another thread for TPS65273V.

    I have probed V33A/V33D/RESET/SCL/SDA and they all on 3.3V, pin15 receiving I2C CLK, pin 16 receiving I2C data

    but BPCAP pin is stay on GND.

  • 0 in reply to Alex Wong
    TI__Expert 3595 points

    Hi Alex,

    Using the UCD9XXX Device GUI (should be downloaded already if you installed Fusion Digital Designer GUI), can you look for DEVICE_ID and also try Scan in ROM Mode? See picture below:
     

    Also I wanted to clarify, the V33A resistor (R192 and R302) that ties V33A to V33D, in your schematic you have 1 ohm resistors, datasheet specifies 4.99 ohm. Is there a reason you went with 1 ohm instead of the datasheet recommendation?

    Regards,

    Samuel Gradinaru

  • 0 in reply to Sam
    Prodigy 180 points

    1/ Yes, I try all options but it only find other ICs on the bus, no UCD ACK

    2/ because I copy the design from PMP9444 so using 1ohm to separate them. 

    Beside UCD eval board even use FB to connect V33A and V33D for fliting.

    As now BPCAP voltage on GND level, is it mean the internal 1.8 LDO not functioning?

    is there any method reset the LDO? 

  • 0 in reply to Alex Wong
    TI__Guru 60800 points

    Hi

    if BPCAP is at 0V, the device won't function. it can explain why GUI can not detect the device.

    Could you put the board under magnifier to double check the soldering to see whether there is any short between BPCAP and GND.

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 180 points

    Hi TI team,

    I fixed my board by replacing new IC, TI tools now can communicate to all devices.

    somehow I got some bad IC at first place...

    Anyway, thanks for supporting.

  • +1 in reply to Alex Wong
    TI__Guru 60800 points

    HI

    Thank you for the update. 

    Regards

    Yihe