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TUSB7340: high current of 1.1V core power supply

toshi-e2e
Genius 4830 points
Other Parts Discussed in Thread: TUSB7340, TPS74401

Hi all, 
My customer faced with the problem about the high output current of 1.1V core supply after reset.
And the value of the current is about 1.3A-rms. 

The power supply for 1.1V is bsed on TPS74401 and is the same with TUSB7340 EVM.
And USB devices are not connected.

Could you please give me any advice for resolving this problem?
The system is with reference to the circuit diagram of the EMV, Also, B8 pin is changed to NC as the datasheet stated.

 

Regards,

Toshi

  • 0
    TI__Guru* 76130 points
    Hello,
    Are they measuring the current consumption of the TUSB7340 EVM?
    Is the above picture only for reference?
    Regards
  • 0 in reply to Elias Villegas M.
    Genius 4830 points
    Hi Elias-san,
    thanks for you reply.
    They are measuring it on their board, not the EVM.
    The above picture is only for reference and also they are copying the EVM circuit.

    Best regards,
    Toshi
  • 0 in reply to toshi-e2e
    Genius 4830 points

    Hi Elias-san,

    I've got the dump file of the registers.
    Also they are using a standard driver for TUSB7340 which is attached the SOC.

    Fullscreen dump_usbc.txt Download 
    root@(none):/proc/bus/pci# hexdump -C 01/00.0
00000000  4c 10 41 82 46 01 10 00  02 30 03 0c 10 00 00 00  |L.A.F....0......|
00000010  04 00 80 30 00 00 00 00  04 00 81 30 00 00 00 00  |...0.......0....|
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000030  00 00 00 00 40 00 00 00  00 00 00 00 52 01 00 00  |....@.......R...|
00000040  01 48 83 fe 08 00 00 00  05 70 86 00 00 00 00 00  |.H.......p......|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000060  30 20 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |0 ..............|
00000070  10 c0 02 00 c3 8f 00 00  10 20 10 00 12 3c 07 00  |......... ...<..|
00000080  40 00 12 10 00 00 00 00  00 00 00 00 00 00 00 00  |@...............|
00000090  00 00 00 00 10 00 00 00  00 00 00 00 00 00 00 00  |................|
000000a0  02 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000b0  00 00 00 00 00 00 0f 00  00 00 00 00 00 00 00 00  |................|
000000c0  11 00 07 00 02 00 00 00  02 10 00 00 00 00 00 00  |................|
000000d0  00 00 00 00 ab 0d 00 00  1b 00 00 00 3f 00 00 00  |............?...|
000000e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000100  01 00 02 15 00 00 00 00  00 00 00 00 30 20 46 00  |............0 F.|
00000110  00 00 00 00 00 20 00 00  a0 00 00 00 00 00 00 00  |..... ..........|
00000120  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000150  03 00 01 00 00 00 20 00  00 28 00 08 00 00 00 00  |...... ..(......|
00000160  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000700  3b 00 b1 00 ff ff ff ff  04 00 00 07 00 0f 0f 1b  |;...............|
00000710  20 01 01 00 00 00 00 00  aa 43 00 00 80 02 00 00  | ........C......|
00000720  00 00 00 00 00 00 00 00  11 db c2 03 10 02 00 08  |................|
00000730  60 00 01 00 02 00 01 00  ff ff 0f 00 00 00 00 00  |`...............|
00000740  0f 00 00 00 00 00 00 00  85 50 23 00 0b 50 23 00  |.........P#..P#.|
00000750  00 00 20 00 00 00 00 00  00 00 00 00 00 00 00 00  |.. .............|
00000760  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000800  00 00 00 00 00 00 00 00  00 00 00 00 0f 01 00 00  |................|
00000810  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000820  1b 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000830  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00001000

    Regards,
    Toshi

  • 0 in reply to toshi-e2e
    TI__Guru* 76130 points
    Thanks,
    I don't think an excessive current is caused by a bad configuration.
    Is the TUSB7340 working properly?
    Is it getting hot?
    Please share the schematics for review.
    What is the operating system? If they are using linux, could they install a windows 10 to see if the current consumption is the same?
    Regards
  • 0 in reply to Elias Villegas M.
    Genius 4830 points
    Hi Elias-san,
    Thanks for your support.

    Yes, the device is getting hot, so they are measuring the core supply current.
    I would like to send the schematics to you by email due to my customer prepared.
    Could you tell me your email address?

    About OS, they are using LINUX, and it's difficult to install WINDOWS OS right now due to the specific SoC.
    Anyway, I would like to update the status.
    About current wave form which is like an oscillation waveform,
    they found that there are mistakes in the connection of current measurement and the regulator of the feedback circuit.
    After modification of the circuit, the measurement current value is as follows;

    During RESET: 395mA <--- Is it acceptable?
    Idle (no devices): 605mA <--- maybe Idle because no device connection, but still high
    one USB3.0 device connected: 675mA
    one USB2.0 device connected: 610mA

    The result shows that still higher current consumption than expected current, 60 - 70mA during Idle .

    Thanks and regards,
    Toshi
  • 0 in reply to toshi-e2e
    TI__Intellectual 2980 points
    Hi Elias-san,

    Is the condition of 63mA power consumption which is shown in datasheet with following Dynamic D3 future?
    www.ti.com/.../slla318.pdf

    Regards, Hirotaka Inoue
  • 0 in reply to Hirotaka Inoue
    TI__Guru* 76130 points
    Hello,
    The dynamic D3 feature works only when handling WAKE# events so it will not affect the current behavior.
    The 675mA is a value that makes sense, the fact that they don't connect anything on the USB ports does not mean the Host controller is in a power saving state, the USB driver is the one that will send the device to a power saving state.

    If they want to get the 70mA consumption than they have to make sure their linux is sending the TUSB7340 to a power saving state.
    Regards