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MSP430F5528: DP83TG720 Media Converter Evaluation Module

Eric Chen
Intellectual 1910 points
Part Number: MSP430F5528

Dear support team,

My customer is evaluating with DP83TG720.

DP83TG720 Media Converter Evaluation Module

MSP430F5528 plays a role in it, 

According to the design (Figure 6-3. Schematic : MCU), I have a few questions for you.

1. MCU's pin 5/6/7/8 connected to DIP switch, what's the function for? Do they have to keep it or can change to pull-high/pull-down resistor? 

2. MCU's pin 18~25 connected to LED, do they have to keep it?

3. MCU's pin 50/52 connected to micro USB connector, is this for debugging?

4. If the MCU's pin isnt' used, the user should connect it to the ground?

Thanks!

  • +1
    TI__Mastermind 28075 points

    Hi Eric,

    I am going to move this to the Interface team/forum since most of these requests are specific to the DP83TG720EVM itself, but ill comment on your questions from at least the MCU side. 

    Eric Chen said:

    1. MCU's pin 5/6/7/8 connected to DIP switch, what's the function for? Do they have to keep it or can change to pull-high/pull-down resistor? 

    The EVM user's guide shows that the DIP switch settings control the operating mode of the board. The MSP430 in this case is just reading the switch state. Whether or not you would need this level of flexibility would depend on the system requirements. If operating in just one of these modes you could just fix the operating mode in firmware, and you wouldn't need to use these pins at all.

    Eric Chen said:

    2. MCU's pin 18~25 connected to LED, do they have to keep it?

    I'll let the interface team comment, but LEDs are almost always just for user information and that appears to be the case here as well. See table 2-1 of the EVM User's Guide (SNLU289) for component functions.

    Eric Chen said:

    3. MCU's pin 50/52 connected to micro USB connector, is this for debugging?

    Again,  I'll let the Interface team confirm the function of the USB in this design. The DP and DM lines are data lines for USB. It looks like the USB on this EVM is being used for configuration/debug. You would want these if you planned to use USB at all in your design. If USB isn't needed, then you could likely do everything you need with a simpler MCU.

    Eric Chen said:

    4. If the MCU's pin isnt' used, the user should connect it to the ground?

    The family user's guide for the MSP430F5528 device gives an overview of how to deal with unused pins by type, see below: 

    Best Regards,
    Brandon Fisher

  • +1 in reply to Brandon Fisher94
    TI__Genius 14006 points

    Hi Brandon,

    The microUSB connector is to connect the MSP430 to your computer to read/write the registers on the PHY via MDIO/MDC. Once the connector is plugged into your computer, you can use this GUI tool to read/write to the registers on the PHY: https://www.ti.com/tool/download/DIEP.

    They do not have to keep the LEDs connected to pins 18-25.

    I've attached a schematic checklist for the DP83TG720 that highlights all the important schematic connections needed for the PHY to function. DP83TG720_Schematic_Layout_Checklist (4).xlsx

    Best regards,

    Melissa