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Original question:

TMS320F28377D: CMPSS Module - Tolerances and Calibration

TMS320F28377D: How to calibrate COMPDAC?

Howard Zou
Genius 12365 points

Part Number: TMS320F28377D

Hi, in the related post

"With hysteresis disabled, you sweep the COMPDAC upwards and downwards and average out the two trip points. You set your COMPDAC to this trip value. "

But how can I get COMPDAC value at the exactly time when the comparator is tripped? It's not possible that every time I manually add 1 to COMPDAC and see if the comparator output change from 0 to 1 or 1 to 0.

  • 0
    TI__Mastermind 28275 points

    Hi Howard,

    You need to use the latch. The basic flow is below:

    1. Set COMPDAC value.

    2. Wait.

    3. Clear latch.

    4. Wait.

    5. Check if latch was set: see below

    Down-Sweep Calibration

    i. If doing a down-sweep calibration, you've found your calibration code if the latch was set from step 5 above.

    ii. If the latch is still clear, decrease COMPDAC value by 1 and repeat from step 2.

    iii. This is your trip code.

    Up-Sweep Calibration

    i. If doing a up-sweep calibration, you've found your calibration code if the latch is clear from step 5 above.

    ii. If the latch is still set, increase the COMPDAC value by 1 and repeat from step 2.

    iii. This is your untrip code.

    Trip and untrip code are usually 1 LSB apart.