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MSP430F2272: Schematic Review: MSP430F2272 for system init, and two channels of ADC10 usage

Luis Cordova
Intellectual 1930 points
Part Number: MSP430F2272

Hello MSP430 experts!

I am looking to have my schematic reviewed. My main goal here is for the MSP to wake up, initialize (over I2C) and enable a few system components, become I2C slave, and then allow for ADC value readout (single-channel single-conversion mode).

Please focus on page 5 where MSP430 is.

Let me know what other information I should provide.9702 Daughter Card.pdf

  • 0
    TI__Mastermind 49692 points

    Hi Luis,

    Thanks for posting your question on E2E. I have a few recommendations about your design.

    • JTAG circuit should follow guidelines in Figure 2-2 in the MSP430 Hardware Tools User's Guide
      • Pull-up resistor should be 47 kOhm
      • Pull-down cap should be 1.1 nF
    • Put a 0 Ohm placeholder between DVCC and AVCC in case you need to reduce noise on the analog side
    • Double-check datasheet for proper termination (hardware and software) of unused pins
    • Power the LEDs from DVCC and control the LEDs by GPIOs using ground-side switching rather than powering them through the GPIOs
    • Add a 0.1 uF decoupling cap near AVCC pin similar to guidance provided in Figure 22-15 in the MSP430x2xx Family User's Guide
    • Also, you seem to be using an external 1.8 V reference, so I would recommend adding a 0.1 uF placeholder between VREF+ and VREF- in case you need to filter out noise from the 1.8 V source

    Hope that helps!

    Regards,

    James

  • 0 in reply to James Evans
    TI__Intellectual 1930 points

    Hi James!

    Thanks for the help here! Hope you are doing great!

    This is immensely helpful. One last question on the LED drive circuit, this look more correct?

    edited as picture did not come through originally.

    When LED_GREEN is HI, LED is off, when LED_GREEN is LOW, LED should be on.

    Thanks again!

  • 0 in reply to Luis Cordova
    TI__Mastermind 49692 points

    Hey Luis,

    Happy to help! Hope you're doing well too :-)

    Luis Cordova said:
    This is immensely helpful. One last question on the LED drive circuit, this look more correct?

    Sorry, the image didn't get attached. Can you try again using the "Insert/Edit Media" icon? Basically, you'd connect the pull-up resistor to DVCC rather than the GPIO. Then, for the ground side, you'd connect that to the GPIO instead.

    Luis Cordova said:
    When LED_GREEN is HI, LED is off, when LED_GREEN is LOW, LED should be on.

    Correct! It's a little backwards when you think about it, but it reduces the power flowing through the device.

    Regards,

    James

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