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F28M35H52C: EQEP module to detect z-pulses

耀威 王
Prodigy 101 points
Part Number: F28M35H52C

Tool/software:

Hello, there is an error detection phenomenon when using the EQEP module to detect z-pulses. Currently, the interference level is around 50us, but the actual z-pulse level is 10ms. Currently, QEPCTL rising edge and falling edge detection are configured, both of which will cause false triggering. Is there any way to configure the EQEP module to filter out false triggering levels? Thank you very much!!

  • 0
    TI__Mastermind 20956 points

    Hi,

    GPIO input qualification can qualify an input signal.

    For this, the signal is first synchronized to the system clock (SYSCLKOUT) and then qualified by a specified number of cycles before the input is allowed to change. Input qualification is performed to eliminate unwanted noise.

    Have you tried this yet?

    Best,

    Ryan Ma

  • 0 in reply to Ryan Ma
    Prodigy 101 points

    Hi，IO filtering configuration, only 18us filtering is calculated, which does not meet the requirements. The abnormal triggering level lasts for 50us, which cannot solve the problem of false triggering

  • 0 in reply to 耀威 王
    TI__Mastermind 20956 points

    Hi,

    Unfortunately it seems that that is the only input filtering we can offer on this device. 

    Best,

    Ryan Ma