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UCD9248: Temperature sensor sequence of UCD9248

Toby Wang
Prodigy 30 points
Part Number: UCD9248

         There is  a TI power manager(UCD9248) on our product. I found temp monitoring of UCD9248 is dislocation.  How to use TI FUSION Digital power manager tool to re-configure UCD9248. Is there any document to reffer?

  • 0
    TI__Genius 9845 points

    Hi Toby,

    UCD9248's internal temperature sensor is not adjustable and may not be accurate enough. If it cannot meet your needs, suggest use an external temperature sensor. There is a temperature sensor input pin on UCD9248.

    Best regards,

    Zhiyuan

  • 0 in reply to Zhiyuan Hu
    Prodigy 30 points

    Hi Zhiyuan
                  Thank for your reply. I have been confused by the problem. There are 5 temperature inputs through a Analog Multiplexers(74HC4051M) in our Product.
     I found external temperature could not match up with Rail #. Is there a mechanism of their correspondence?

    Best Regards

    Toby

  • 0 in reply to Toby Wang
    TI__Genius 9845 points

    Hi Toby,

    There are TMUX0-2 pins to control the 74HC4051. Please refer to datasheet page 23, subsection "Temperature Monitoring" for details.

    Best regards,

    Zhiyuan

  • 0 in reply to Zhiyuan Hu
    Prodigy 30 points

    Zhiyuan

                 it is expected corresponding relation as below. but i found actual relation as another list table.

    May I use Fusion tool to modify the corresponding relation between temperature inputs and Power stage?

    Temperature Input 74HC4051 Power stage
    Rail #1_1V2_2V5_TEMP A0 DPWM_1A
    Rail #1_1V2_2V5_TEMP A1 　
    Rail #2_3V3_TEMP A2 DPWM_2A
    Rail #3_1V0_TEMP1 A3 DPWM_3A
    Rail #3_1V0_TEMP2 A4 DPWM_3B
    Rail #4_1V2_2V5_TEMP A5 DPWM_4A
    N/A A6 N/A
    N/A A7 N/A

    Temperature Input 74HC4051 Power stage
    Rail #1_1V2_2V5_TEMP A0 DPWM_1A
    Rail #1_1V2_2V5_TEMP A1 DPWM_2A
    Rail #2_3V3_TEMP A2 DPWM_3A
    Rail #3_1V0_TEMP1 A3 DPWM_3B
    Rail #3_1V0_TEMP2 A4 DPWM_4A
    Rail #4_1V2_2V5_TEMP A5 N/A
    N/A A6 N/A
    N/A A7 N/A

    Best Regards

  • 0 in reply to Toby Wang
    TI__Genius 9845 points

    Hi Toby,

    The behavior of the device is that, if there are n phases in the design, the n temperature signals should be wired to the first n multiplexer inputs. In your case, you have 5 phases in the design. So the temperature signals should be wired to the first 5 inputs of the multiplexer.

    Unfortunately this behavior cannot be changed from Fusion GUI.

    Best regards,

    Zhiyuan