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TUSB2046BVF w/o EEPROM -- Power Implementation Review

Raelyn Rosa
Prodigy 40 points

Hello,

We have been working and developing a system using Windows Embedded Standard 7. We use the TUSB2046BVF hub, which supports communication to a uC. The application we're developing requires that we enter sleep mode quite often during a protocol to minimize heat production. We've been encountering a problem periodically where we lose connection to the uC on the other end of the TUSB hub. Sometimes we encounter a write error, in which we can't write to the  uC. And sometimes the com port disappears all together. "COM 12 does not exist", and we can't find this port until we restart the computer.

I realize that there are many sources of this problem, including the operating system, our software, etc, and we are looking into those. But I'm curious to know if our implementation has been done correctly. I'm attaching a schematic of the implementation and power configuration that is being used.

Any help or thoughts on this mystery would be appreciated :) 

0285.TUSB Implementation.pdf

Thank you so much,

Rae

  • 0
    TI__Mastermind 36085 points

    Hello Raelyn,

    You are right there are many sources of the problem, so I think We have to start to check the devices status and the integrity of the power signals on the HUB and your uC. Please try to reproduce the issue and check all the time if there are a power fail on the devices and also  the status of the HUB and the uC (active, suspend, reset).

    Also I found a some details on the schematic; the capacitors C36 and C37 should be equal to 27pF (the TI EVM implements 30pF capacitors) and is recomended to add a 1.5KOhms resistor between the crystal and the XTAL2 terminal. 

    Regards,

    Diego.