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UCD90160 schematic review

Hoang Manh
Intellectual 380 points
Other Parts Discussed in Thread: UCD90160

Hi all,

We are designing an power supply system using UCD90160 to monitor and enable voltage rails. Attached is portion of our schematic, which shows how we connect UCD90160 in our project.

Can you help take a look and give me any advice?

Thanks and Best Regards,

Hoang ManhUCD90160_PowerMonitor.pdf

  • TI__Genius 9845 points

    Hello,

    1. Do not recommend PMBus address 126. This is for JTAG mode only.

    2. TRST# should be tied to ground via 10K.

    3. Suggest add the brownout circuit in datasheet Figure 23.

    Thanks,
    Zhiyuan

  • in reply to Zhiyuan Hu
    Intellectual 380 points

    Hi Zhiyuan,

    Thanks for your quickly response.

    Just one question about your item (4): "Suggest use Low-Latency GPIs for GPI purpose. PIn 31, 32, 41, 42 are not low latency GPI; they can be used as EN pins. When you assign GPI pins in Fustion GUI, the GUI will tell you which pins are low-latency GPI (Pin 11, 12, 13, 14, 25, 33, 34, 35)."

    As I understand, Pin31, 32, 41, 42 are the GPI only pins (they can not be configurated as GPO pins), how can I use them as EN pins?

    Thanks and Best Regards,

    Hoang

  • in reply to Hoang Manh
    TI__Genius 9845 points

    Hi Hoang,

    Sorry, my mistake. They can only be GPIs or PWMs. Please ignore item (4).

    Regards,

    Zhiyuan

  • in reply to Zhiyuan Hu
    Intellectual 380 points
    Hi Zhiyuan,

    I incorperated item1, item2 into our schematic. But I don't fully understand about brownout circuit.
    As far as I understand, we just place a schottky diode between the 3.3V power supply and UCD90160's power pins?

    Regards,
    Hoang
  • in reply to Hoang Manh
    TI__Genius 9845 points
    If the UCD90160 does not have an independent standby power, i.e., 3.3V is converted from main power, when main power drops, UCD90160 may not finish writing the fault logs before the 3.3V drops. This may cause losing all fault logs and possible flash corruption. The brown out function can prevent this from happening. The solution includes two parts: (1) circuit: add a schottky diode between 3.3V and UCD90160's power pins. The decoupling cap after the schottky should be around 1mF to provide enough hold up time. (2) Fusion GUI: enable brownout function in the device configuration.

    Thanks,
    Zhiyuan