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TCA8418 max scan rate

Dan Andersen

Genius 11270 points

Other Parts Discussed in Thread: TCA8418, TCA8418E

What is the max keyscan rate for the TCA8418? My customer seems convinced it will take 25ms-40ms to detect a key change, yet it appears to me we are more like 25us. I am confused by the 60ms debounce spec shown in section 6.9 when other areas of the datasheet indicate 50us debounce. Can you explain the difference here?

Thanks,

Dan

over 7 years ago

0 fhoude over 7 years ago

TI__Genius 17215 points

Hello Dan,

I have verified that this is a typo. It should be max of 60uS for debounce. I have put it in the datasheet update backlog for both the TCA8418 and TCA8418E.

-Francis Houde

0 Siby James over 7 years ago in reply to fhoude

TI__Expert 5140 points

Hi Dan,

Thanks for bringing this up. We have this in our list of changes that need to be made.

The correct unit is "us".

Thanks,
Siby

0 Dan Andersen over 7 years ago in reply to Siby James

TI__Genius 11270 points

I notice we also show ms units on page 33. I believe this should be us as well. Please confirm.

Thanks,

Dan

0 Siby James over 7 years ago in reply to Dan Andersen

TI__Expert 5140 points

Dan,

Thanks for bringing this up. I'm almost sure this should be changed to us since it's referring to the debounce.

I'll confirm this for you and get back to you.

Thanks,

Siby