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TMS320F28069F: TMS320F28069F schematic issue

AHMED MOHD
Prodigy 10 points

Part Number: TMS320F28069F
Other Parts Discussed in Thread: TMDSCNCD28069, LAUNCHXL-F28069M, TMDSCNCD28069ISO

Hello Sir,

I am attaching my schematic,

can u plz validate my power pin and other important pin connection ??

TMS320F28069F_SCHEMATIC.pdf

  • 0
    Guru 30330 points

    Ahmed,

    I recommend looking at both the LAUNCHXL-F28069M, TMDSCNCD28069, and TMDSCNCD28069ISO. These are pretty solid references for the MCU requirements. I hope you have compared against the datasheet requirements as well.

    Generally here are a few high-level guidelines for you to follow when reviewing your schematic:

    • Ensure VDDIO, VDDA, and VDD pins have proper capacitance per the Datasheet recommendations. These caps should be placed as close to the pin as possible in the layout
    • Ensure GND is directly connected to GND of the PCB.
    • Follow XRSn guidelines for RC values.
    • Follow recommendations for connections for unused pins.
    • Ensure that the output of your power supply can 

    All that being said, I took a look:

    • VDD recommendation is 1.2uF decoupling cap between each pin and GND. 2.2uF is going to be fine as well. keep the body size of these decoupling caps as small as possible (doesn't need to be 0201 or even 0402, but definitely don't got 1206)
    • Not sure why there is a 2.2k PD on TDO? refer to Section "Emulator Connection Without Signal Buffering for the MCU" in http://www.ti.com/lit/SPRS698

    Overall this looks pretty solid from my perspective except for the TDO. That's not explicitly necessary. If anything I would put that on TDI to help limit noise from going into the TDI pin.

    Regards,

    Mark