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TUSB2077A
Related Posts

  • Forum Post: Re: TUSB2046B Errata

    DHarmon
    Riaan, USB Suspend is fully under the control of the host system. The TUSB2077A (or any other hub peripheral) can only respond to commands issued by the hosts system, which is a combination of the host controller and operating system.
    on May 10, 2010

  • Forum Post: TUSB2077A and overcurrent protection

    Calum Mackinnon
    Hi, I have a customer who is thinking of switching to the TUSB2077A due to hardware issues with another vendor. His current issue is - when the device detects an overcurrent condition it disables the port but does not reinitialize the port when the overcurrent condition goes away - he needs a hard...
    on Aug 15, 2010

  • Forum Post: TI TUSB2077A and PCM2900B compatibility issue

    Yao Ding
    We have a design with TUSB2077A hub, down stream with the followings: - PCM2900B codec - MSP430F5510 - PIDUSBD12 from Philips/NXP/ST Ericson other 4 ports are open. The codec PCM2900B line in/button in (mute/up/down) only work with certain computers, some machines show problem in recognizing...
    on Oct 27, 2010

  • Forum Post: Re: TI TUSB2077A and PCM2900B compatibility issue

    Yao Ding
    Thanks Dan. The USB compatibility issue could happen in silicon, as much of the protocal is hard coded to reduce latency and dev cost/time. One example is old Philips PIDUSBD11, which was discontinued for 2.0 compliance issue. I'm guessing hub 2077A which is USB 1.1 may run into this, can you forward...
    on Oct 27, 2010

  • Forum Post: Re: TI TUSB2077A and PCM2900B compatibility issue

    DHarmon
    Do you have the capability to bypass the TUSB2077A with the PCM2900B device on a PC where the button does not work and see if they problem still exists? The TUSB2077A is on the USB-IF Integrators List and has no known compatibility issues with USB full-speed devices like the PCM2900B.
    on Oct 27, 2010

  • Forum Post: Re: TUSB2077 (2046)

    DHarmon
    Chris, These devices are over 10 years old and as USB high-speed becomes the standard use case, USB full-speed hub applications are becoming fewer and more select in where they are implemented. Due to the age and the declining market for full-speed hubs, as the errata document states: TI has no planned...
    on Nov 3, 2010

  • Forum Post: TUSB2077 design considerations

    Atif Bhatti
    I am thinking about using this chip in my Fixture design to be able to talk to 14 FTDI Chips. I have a few questions 1). Are there any layout considerations regarding distances between this chip and upstream/downstream USB ports? 2). Any recommendations for Trace width etc? 3). since I have...
    on Jan 30, 2011

  • Forum Post: Re: TUSB2077 design considerations

    DHarmon
    Atif, A 2K and 0.1uF give a reset pulse of 200us. Per the TUSB2077A data sheet, for the /RESET pin description. Generally, a reset with a pulse width between 100 μs and 1 ms is recommended after 3.3-V VCC reaches its 90%. The clock signal must be active during the last 60 μs of the reset window...
    on Feb 22, 2011

  • Forum Post: Re: TUSB2077A BUSPWR signal

    Michael Peffers
    Pete, I heard back from the department this morning that deals in the TUSB2077A and they confimred with me that the data sheet for the TUSB2077A is incorrect. The BUSPWR pin is in fact active low. -Mike
    on Aug 12, 2011

  • Forum Post: Re: TUSB2077A BUSPWR signal

    DHarmon
    Pete - yes they should be reversed.
    on Aug 16, 2011

  • Forum Post: Re: query on TUSB2046B hubs

    DHarmon
    Natesh, First the question of cascading hubs has been asked and answered in multiple other forum posts from you - please try and consolidate your questions into one post for easier responses and a cleaner forum. As far as the EXTMEM pin, there is no more need for an EEPROM when cascading versus...
    on Dec 6, 2011

  • Forum Post: Re: tusb2046b hub

    DHarmon
    Alfredo, I am sorry but I am not sure what your question is. When you ask " What is the diference with tusb2077 for self powered? ", you are asking me to compare this to something else - I am not sure what you are wanting me to compare it to? The TUSB2077A as a bus-powered hub or one...
    on Jan 5, 2012

  • Forum Post: Re: tusb2046b hub

    DHarmon
    Alfredo, I am sorry but I am not sure what your question is. When you ask " What is the difference with tusb2077 for self powered? ", you are asking me to compare this to something else - I am not sure what you are wanting me to compare it to? The TUSB2077A as a bus-powered hub or one...
    on Jan 5, 2012

  • Forum Post: TUSB2077 USB Hub, Crystal only runs in Reset

    Chuck Still
    I have a design that is using two TUSB2077 USB hub chips. The schematic and card layout are identical. We have built about 75 cards now and I have found five cards that one of the TUSB2077 chips does not work. I noticed that the crystal was not oscillating and suspected the reset may not be held long...
    on Jan 5, 2012

  • Forum Post: Re: tusb2046b hub

    DHarmon
    Alfredo, Ok, now I understand. Fundamentally, yes, that is all that changes. You will need additional power available as you are required to provide the full 500mA on each of the downstream ports. I have attached the TUSB2077AEVM schematic for reference as well.
    on Jan 5, 2012

  • Forum Post: TUSB2077A Debugging Help

    kailas narendran
    I'm having some trouble getting the TUSB2077A hub to work. My schematic is shown below. It's a close copy of the reference diagram from p13 of the datasheet. This is to be used in an "installed once" setup, so I don't need power management for the ports of the hub. There are...
    on Feb 13, 2012

  • Forum Post: Re: TUSB2077A max trace length

    DHarmon
    The TUSB2077A is a USB full-speed hub with a maximum data transfer speed of 12 Mb/s. The Intel guidelines you linked to are for USB high-speed (480 Mb/s) connections which obviously prenet a mcuh greater challenge than does 12 Mb/s. There should not be any issues in driving 18" of trace. ...
    on Mar 16, 2012

  • Forum Post: TUSB2077A - Downstream Device problem

    Damjan Mujagi��
    Hello, i hope You can help me with this. USB HUB TUSB2077A is configured as : - Self-Powered ( /BUSPWR == VCC ) - No EEPROM ( /EXTMEM == VCC ) - GANDGED-PORT enabled ( EEDATA/GANGED == GND ) - RESET ( Power-Up )is imlemented with PIC uC. Enumeration and configuration of USB HUB is...
    on Apr 11, 2012

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