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TMDS570LS12HDK: Question about evaluation Board LINTX/LINRX pin usage

Claudio Paglia
Prodigy 30 points
Part Number: TMDS570LS12HDK
Other Parts Discussed in Thread: TMS570LS1227,

Dear TI E2E Team,

I am using  evaluation board TMDS570LS12HDK to develop a project with TMS570LS1227 microcontroller, and i have some concerns about pins LINTX/LINRX on connector J11.

In particular, from the electrical schematic contained in spnr035 documentation, pins A7 (LINRX) and B7 (LINTX) of the microcontroller are connected both to the connector J11, through 0R resistors R125 and R124, and to the pins 38 and 39 of FT2232HL chip U27 through 100R resistors R123 and R122.

For my project i have to use microcontroller pins A7 and B7 configured as inputs; has anyone already used J11 pins LINRX and LINTX? Is it possible to drive them without worrying about FT2232HL chip? My external signal generator is capable of sinking or sourcing a current up to 16mA.

Thanks for your attention and collaboration, i wait for your reply.

Best regards

Claudio Paglia

  • 0
    TI__Guru 69891 points

    Hi Claudio,

    FT2232HL can be able to interface with two independent interfaces, each can be UART/FIFO/JTAG/SPI/I2C.

    In our design we selected those two interfaces as UART and JTAG. So that means the FT2232HL will function like

    1. USB to JTAG

    2. USB to UART

    Here USB to JTAG is used for device programming and debugging. Whereas USB to UART is used as a console to interface with PC.

    If you don't want to use USB to UART, then you can use those LIN pins as GIO inputs. If you want to use those pins as GIO inputs my suggestion would be better to disconnect 100 ohm resistors.

    Because if you operate these pins as GIO inputs and applying voltages to these pins, then these voltage levels will get affected by the FT2232HL. So, for proper operation it would be better to remove 100 ohm resistors.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Prodigy 30 points

    Dear Jagadish,

    thank you for your response. I'll consider your suggestion and come back to you for feedback.

    Best regards

    Claudio