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TUSB544: Help to check some issues about it.

Lian Wu
Genius 5250 points
Part Number: TUSB544


Dears:

There are some questions about TUSB544 as follows:

1.  Can we disconnect SBU signals under TUSB544 has no power and the system has power?

     In the system SBU has two functions, one is imitate headphone and the other is DP's AUX interface.

2. What is the state of IIC ? Is it Hi-Z state? Whether the IIC will leak current if TUSB544 has no power and the system has power?

3. What is influence of HPDIN and SLP_S0 in the USB protocol?

Thanks!

Best regards

Luck Wu

  • 0
    TI__Mastermind 36085 points
    Hello Lian,

    Yes, you can disconnect the SBU signals when the TUSB544 is powered down, just make sure that the SBU lines are connected before the DP mode is enabled. Your second question needs to clarify whether the device has no power at all or is in disabled mode and which pins are you referring to; in Shut down mode, its power consumption is as low as 0.65mW.

    The HPDIN has no effect in USB, this signal belongs to the DP interface and that's it, meanwhile SLP_S0# disables the RX_detect function, if the device is active when asserted (LOW), then its internal receivers/drivers will be ON permanently, regardless if there is a USB device connected or not. On the other hand, if the device is disabled when SLP_S0 is asserted (LOW), then its internal receivers/drivers will be OFF permanently, regardless if there is a USB device connected or not. We recommend leaving this pin connected to HIGH for normal operation.

    Regards,
    Diego.
  • 0 in reply to Diego Cortes
    Genius 5250 points

    Hi Diego:

    Thanks for your support, I discussed with customer, and we have other issues to discuss with you!

    1.  If there is no 3.3V power, is AUX and SBU on disconnect state?(Only TUSB544 has no power, and System is power on)

    2. If TUSB544 has no 3.3V power, is there any leak current with IIC? And how many Ohm between IIC and GND?

    3. If we use the IIC mode and the power is 3.3V, what is the power consumption under the Power down mode?

    4. What signals will IIC not control except SLP_0 singnal under IIC mode?

    5. What is the function about HPDIN? How to connect HPDIN with  Type C interface?

    6. Why the reference is designed to have pull-up resistor and pull-down resistor? What is the principle?

    Best regards

    Luck Wu

  • 0 in reply to Lian Wu
    TI__Mastermind 36085 points

    Hello Lian,

       Here you go my feedback:

    1. The state is disconnected when powered off.
    2. I need time to look for the exact number. It should be less than when in shutdown mode.
    3. The TUSB544 power consumption during shutdown mode is 0.65mW maximum.
    4. I don't clearly understand what you meant with IIC state. SLP_0# controls the receiver detection. If the device was active when you assert this pin (LOW), then the differential pairs will be ON permanently, regardless whether a device is connected or not; if the device was disabled when this terminal has been asserted (LOW), then its differential pairs will be off, regardless whether a device is connected or not.
    5. The HPDIN is connected either way to the Power Delivery controller, The Type C Port Controller or the Type C Port Manager. Depending on the device selection and topology you have. (Typically the Port Controller or Power Delivery controller detects that a device has been connected with DP support, then advertises the function to the Port Manager for further handling or directly enables the TUSB544).
    6. The included Pull-up and Pull-down resistors are for debug and flexibility purposes. usually the designer populates only the default option or connects directly to a controlling signal.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    Genius 5250 points

    Hi Diego:

    Thanks for your feedback, and we have 3 issues to discusse with you!

    1. Could you kindly help to check the exact number? Since the customer will design according the number.

    2. From the datasheet the 0.65mW is under the IIC_EN=0, and we want to know the power conumption under IIC mode.

    3. From the reference design the swap pin is designed to have Pull-up and Pull-down resistor, is there any special purpose?

    Could you kindly help to check the schem?

    Pls. kindly help to check this issues, thanks a lot!

    SCHEMATIC1 _ P30. TYPE C.pdf

  • 0 in reply to Lian Wu
    TI__Mastermind 36085 points
    Hello Lian,

    Unfortunately, we do not have the power consumption numbers when VCC is off. The customer should design using the using the shutdown mode as the reference, I understand that the shutdown mode is different than powered off, but as I mentioned it is the only number we have. The reference design shows pull-up and pull-down resistors in the swap terminal for reference only, it can be connected to a control signal if needed. Otherwise, the customer can populate the pull-up or pull-down option that fits its necessities.

    I will review the schematic and provide a complete feedback by tomorrow.

    Best regards,
    Diego.
  • 0 in reply to Diego Cortes
    Genius 5250 points

    Hi Diego:
    OK, got it. I will talk about it with customer.
    Btw, I fogot another issue is the driver example code of TUSB544 under android７.０/linux4.4 system. Where can I download?
     Many thanks for your support.

    Best regards
    Luck Wu

  • 0 in reply to Lian Wu
    TI__Mastermind 36085 points

    Lian,

       There is no example code for the TUSB544, the customer must decide which PD controller TCPC device will use in order to configure the TUSB544.

    Regarding the schematic:

    • C3007 should be at least 4.7uF
    • seems that the configuration is via I2C, so I2C_EN should be connected to a pull-up resistor.
    • Why HPDIN and SLP_S0# are connected together?
    • I recommend to include placeholders for config resistors on all the NC signals.

    Best regards,

    Diego.