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Original question:

TMS570LS1227: Clarification on eQEP Index Event Latch

TMS570LS1227: eQEP: Position Counter Incorrectly Reset on Direction Change During Index

Luis Lanca
Prodigy 250 points
Part Number: TMS570LS1227

Dear all,

During testing of our application (position and speed motor control with PMSM and optical encoder) we are confident that we observed a very similar issue reported in SPRZ362D/Revised March 2016, TMS320F2805x Piccolo MCU Silicon Errata, for easy access  a screen shot is provided below. We currently in our application we account tin the implementation for +/- 5 quad counts ( with QEPCTL[PCRM] = 00).

Is it possible that this silicon bug is present in TMS570LS1227 though not documented in the applicable erratas (I think SPNZ199F/Revised May 2016 and SPNZ218C/revised March 2016)?

Thanks a lot for your time and support.

Best regards,

Luis