DS90UB914A-Q1: tDDLT : Minimum time

Masaaki Sugiyama68

Expert 1445 points

Part Number: DS90UB914A-Q1

Dear Support Team;

I will use the LOCK pin for interrupt to MCU.

Could you tell me the minimum time of tDDLT?

If the minimum time is very shot, MCU can not receive the interrupt.

Best Regards,

Masaaki Sugiyama

over 7 years ago

0 Charley Cai over 7 years ago

TI__Genius 12866 points

Hi,

The minimum tDDLT should be irrelevant. When LOCK is going from low to high, it is not a single edge transition.

A simple interrupt on LOCK may not work as expected.

One approach would be setting a timer from clock received to 30ms, then interrupt on LOCK signal.

LOCK transition from high to low is single edged, so interrupt on loss of LOCK has no problem.

Sincerely,

Charley Cai

0 Masaaki Sugiyama68 over 7 years ago in reply to Charley Cai

Expert 1445 points

Dear Charley-san;

Thank you for your quick reply.

I will use the lock transition from high to low for interrupt to MCU.

I want to re-transmit if the unlock occur.

Could you tell me the minimum low pulse width of LOCK signal?

Best Regards,

Masaaki Sugiyama

0 Masaaki Sugiyama68 over 7 years ago in reply to Masaaki Sugiyama68

Expert 1445 points

Dear Charley-san;

I am waiting for your reply.

Could you help me?

Best Regards,

Masaaki Sugiyama

0 Charley Cai over 7 years ago in reply to Masaaki Sugiyama68

TI__Genius 12866 points

Hi Masaaki-san;

I will do some testing to verify the minimum low pulse width and reply. Thanks for your patience.

Sincerely,
Charley Cai

0 Masaaki Sugiyama68 over 7 years ago in reply to Charley Cai

Expert 1445 points

Dear Charley-san;

Thank you for your grate support.

I am waiting for your infomation.

Thank you!

Best Regards,
Masaaki Sugiyama

0 Charley Cai over 7 years ago in reply to Masaaki Sugiyama68

TI__Genius 12866 points

Hi,
The minimum low pulse width measured is 292 us.

Sincerely,
Charley Cai

0 Masaaki Sugiyama68 over 7 years ago in reply to Charley Cai

Expert 1445 points

Dear Charley-san;

Thank you for your great support.

I understood.

Thank you!

Best Regards,

Masaaki Sugiyama

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DS90UB914A-Q1: tDDLT : Minimum time