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TUSB4041I-Q1: Current consumption during reset

Ryu Yamashita
Expert 2460 points
Part Number: TUSB4041I-Q1

Tool/software:

Hi team,

When GRSTz was Low, current consumption flowed 285.7 mA for VDD and 75.6 mA for VDD33. After reset release, VDD was 32.7mA and VDD33 was 13mA.
Is it a specification that the current consumption of this device increases during reset?
If so, what is the principle behind this increase in current consumption?

Regards,
Ryu.

  • +1
    TI__Guru** 123115 points

    Hi Ryu:

        There is POR ( power on reset circuit )  inside hub on GRSTz pin. When GRSTz is low, VDD supply current will go high  around 300mA. Once GRSTz goes high, VDD current will below 100mA.

    Regards

    Brian

      

  • 0 in reply to Brian Zhou
    Expert 2460 points

    Hi Brian,

    Tell me a few more things.
    Does the current consumption rise to about 300mA for both VDD and VD33?
    Also, will this current consumption during reset ever be added to the datasheet?
    Also, the current consumption during reset generates heat. If the reset is continued, will it affect the life of the product?

    Regards,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Guru** 123115 points

    Hi Ryu: 

    Ryu Yamashita said:
    Does the current consumption rise to about 300mA for both VDD and VD33?

         only for VDD, VDD33 is still normal

    Ryu Yamashita said:
    Also, will this current consumption during reset ever be added to the datasheet?

      not in datasheet yet, we just found this recently

    Ryu Yamashita said:
    Also, the current consumption during reset generates heat. If the reset is continued, will it affect the life of the product?

        TUSB4041 was  changed from TUUSB8041, VDD can support 700ma. So even it may generate heat if reset is continued, it will not affect the life ofproduct.

    Best

    Brian

         

  • 0 in reply to Brian Zhou
    Expert 2460 points

    Hi Brian,

    Thanks for the reply.
    In my measurement, there was a 50mA increase in VDD33 at reset, but I wonder why the current consumption went up here.
    Are there any plans to include this information in the data sheet?


    Regards,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Guru** 123115 points

    50 mA on VDD33 is still normal.

    For datasheet update, I need to talk to system  to what is our plan.

    Best

    Brian