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SD_16A absolute voltage range different for MSP430F4250 and MSP430F4784?

Brown59592
Expert 1680 points
Other Parts Discussed in Thread: MSP430F4250, MSP430F4784

Checked the description of the SD16_A modules in both of the controllers:

http://www.ti.com/lit/ds/symlink/msp430f4250.pdf

SD16_A, input range: Vi - Absolute input voltage range: AVSS-0.1V    AVCC

http://www.ti.com/lit/ds/symlink/msp430f4784.pdf

SD16_A, input range: Vi - Absolute input voltage range: AVSS -1V AVCC

Are those values different for the two MCU's or it's some error in the description?

  • 0
    Guru 227245 points

    Indeed, the 4250 SD16 inputs are 'single supply' differential inputs. Input voltage must not be below VSS (plus 0.1V 'headroom' by clamp diode voltage. Any input voltage below will be clamped to VSS. This is a restriction by (not only) the fact that the analog input pins are shared with digital I/O input pins.
    Also, the SD16 in this MSP is a single SD16 with multiple (selectable) inputs.

    The 4783 has multiple SD modules with one input each (allowing parallel sampling rahther than sequential sampling with cwitched channels) and analog inputs are not shared with digital I/O. So negative input voltage is allowed down to -1V. However, differential imput voltage must not exceed +-0.6V in bipolar mode (for 1.2V reference)

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