DRV8889-Q1: Step-out detection

TEZUKA FUMIKA

Part Number: DRV8889-Q1

Hello,

I want to detect step-out.

After it starts moving, it physically stops the motor. In this figure, TRQ_COUNT <STALL_TH is set, but FAULTstatus STALL = 1 is not set.
STALL_TH will not be rewritten, STL_LRN_OK = 1 will not be.

Why is the step out not detected?
Is it correct in the recognition that step-out detection occurs in this way?


<Configuration>
DECAY = 111b　Ripple control mode
STL_LRN = 1
EN_STL = 1

over 3 years ago

0 Wang5577 over 3 years ago

TI__Guru 56650 points

Hello, Teauka-san,

"STL_LRN = 1" sets DRV8889 in learn mode. Stall detection doesn't report the stall condition in learn mode. 

Regards,

Wang

0 TEZUKA FUMIKA over 3 years ago in reply to Wang5577

Prodigy 150 points

Hello,

I tried again with the following settings without setting the learning mode, but step-out detection does not occur.In the figure, TRQ_COUNT <STALL_TH is set, but FAULTstatus STALL = 1 is not set.

Why doesn't step-out detection occur?

<Configuration>
DECAY = 111b　Ripple control mode
EN_STL = 1

0 Ryan Kehr over 3 years ago in reply to TEZUKA FUMIKA

TI__Guru 55605 points

Teauka-san,

Wang is currently out of the office. Let me study and respond.

Regards,

Ryan

0 Ryan Kehr over 3 years ago in reply to Ryan Kehr

TI__Guru 55605 points

Teauka-san,

Is the frequency of the STEP input changing during this period? If STEP input signal is changing frequency like during acceleration, the stall reporting will not report correctly. Please check this as one possible reason.

Regards,

Ryan

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DRV8889-Q1: Step-out detection