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xinjie
Level 1
Level 1
5 replies posted 5 sign-ins First reply posted

Hi Infineon

When MCU(-TC397) stop feed watch dog, ROT will high->low,and ss1 will low after 5us.

In my design I need SS1 go low earlier than ROT(1us is enough) If any ways can adjust ROT and SS1 timing? 

 

Can I use RC circuit make ROT  delay 1us? Is there any bad effect? 

 

 

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1 Solution
Polimera
Moderator
Moderator
Moderator
10 likes received 100 replies posted 50 solutions authored

Hello Xinjie,

Usually after ROT goes low then SS1 will go low.

ROT becomes active as soon as an error is detected. ROT and SS1 go down after time VΔtDET,LF.  if no recovery delay has been selected.

With Recovery delay configured

In case the recovery delay option has been selected and the error is still present, ROT and SS1 still goes down after VΔtDET,LF +Δtrec ,   _SS2 goes down after _VΔtDET,LF + Δtrec + additional delay if configured  . That recovery delay may have be programmed to 10ms.

Implementing an RC circuit is depends on your application. In case if the severe fault happens then this delay will effect the system.

Regards,

Kranthi

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3 Replies
Polimera
Moderator
Moderator
Moderator
10 likes received 100 replies posted 50 solutions authored

Hello Xinjie,

Usually after ROT goes low then SS1 will go low.

ROT becomes active as soon as an error is detected. ROT and SS1 go down after time VΔtDET,LF.  if no recovery delay has been selected.

With Recovery delay configured

In case the recovery delay option has been selected and the error is still present, ROT and SS1 still goes down after VΔtDET,LF +Δtrec ,   _SS2 goes down after _VΔtDET,LF + Δtrec + additional delay if configured  . That recovery delay may have be programmed to 10ms.

Implementing an RC circuit is depends on your application. In case if the severe fault happens then this delay will effect the system.

Regards,

Kranthi

xinjie
Level 1
Level 1
5 replies posted 5 sign-ins First reply posted

Hi Kranthi

Thanks for your reply

You mean ROT/SS1/SS2 timing is <Fault occur -> ROT goes down -> SS1 gose down -> SS2 goes down>.

My requirement need  <Fault occur -> SS1 gose down -> ROT goes down>, is there any solution can meet this requirement?

Thanks again~

 

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Polimera
Moderator
Moderator
Moderator
10 likes received 100 replies posted 50 solutions authored

Hello xinjie,

No that solution is not there. But you can skip the ROT triggering for some faults.

In case if you keep the MPS pin active then the ROT wont trigger for the WWD,FWD,ERR faults. Only SS1 & SS2 will trigger.

Regards,

Kranthi

 

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