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TMS320F280021: F280021 Schematic Feedback

Michael Black2
Intellectual 350 points

Part Number: TMS320F280021

Hello,

I just finished wiring up the JTAG and power circuits for the F280021, and I want to make sure everything is correct.

Both the VDDIO and VDDA pins need a 3.3V supply, right?

Also, is that pull-up tied to VDDIO done correctly?

  • +1
    TI__Mastermind 42195 points

    Please consult the Datasheet for recommendations, its kept up-to-date with all the latest recommended connections for each pin.https://www.ti.com/lit/gpn/tms320f280021 

    Michael Black2 said:
    Both the VDDIO and VDDA pins need a 3.3V supply, right?

    Yes both VDDIO and VDDA should be connected to 3.3V. Please note that they both have decoupling capacitor requirements mentinoed in the DS.

    Michael Black2 said:
    Also, is that pull-up tied to VDDIO done correctly?

    Are you talking about the TMS pin? This needs a pull-up resistor to 3.3V, it doesn't specifically have to be VDDIO. Looking at your net names VCC_3V3 connects to VDDIO and then VDDIO connects to that pull-up so you're OK.

    Ps,

    • VDD has more bulk capacitance than you need. 
    • Check with your VREG that 22uF is correct bulk cap on the 3.3V rail.
    • XRS is still critical to connect, please follow DS.
    • I did not verify the ti14 pin JTAG connections
    • Please ensure that your ESD protection diodes are appropriate for this application.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Intellectual 350 points

    Thank you so much for the feedback, Cody.