TMS320F2800137: Found frequency glitch through ECAP

Rahul Sharma

Part Number: TMS320F2800137

We have sensing frequency through ECAP module from Hall sensor. from 0 to 50 Hz, some time we are founding incorrect values. What can be the reason for same?

over 1 year ago

0 Ryan Ma over 1 year ago

TI__Mastermind 27736 points

Hi Rahul,

When does the issue occur? When are you findnig incorrect values? is it only under certain frequencies?

Best,

Ryan Ma

0 Rahul Sharma over 1 year ago in reply to Ryan Ma

Prodigy 120 points

When motor is running a constant speed That time HA and HB values are coming wrong at some moment. Where Ha and Hb are as

HA = (int32)ECap1Regs.CAP3 - (int32)ECap1Regs.CAP1;
HB = (int32)ECap2Regs.CAP3 - (int32)ECap2Regs.CAP1;

0 Ryan Ma over 1 year ago in reply to Rahul Sharma

TI__Mastermind 27736 points

Are you using any input qualification? This should help smooth out the input coming into the pins in case of any noisy signals causing eCAP to read incorrect edges.

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TMS320F2800137: Found frequency glitch through ECAP