TLF35584QVHS2 closed window time of Window Watchdog

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Ivelin
Level 1
Level 1
25 sign-ins 5 questions asked 5 likes given

Hi community,

I am trying to find the "closed window"  time duration of the Window Watchdog of the TLF and

though it is mentioned it is of fixed time and

this time is called  "twd,cw" it is nowhere throughout the datasheet.

Let's say it is the first "long open window" of the first Init state and it gets correct triggering though SPI,

should I configure there in the first message the duration of the "closed window" or is it default duration

and if so, how much it is? 

Thanks a lot in advance,

Ivelin

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1 Solution
Vishnu_Nambrath
Moderator
Moderator
Moderator
50 solutions authored 100 replies posted 5 likes given

Hello Ivelin, 

The duration of closed and open windows is configurable. 
Open window will be closed immediately after getting a trigger. So actual "Open window" will be less than the configured time.

Closed window will be closed after finishing its configured time. Hence always "Closed window" will have a fixed time. 

Duration of open window and closed window can be configured by using the below registers. 

Vishnu_Nambrath_0-1667539150423.png

Vishnu_Nambrath_1-1667539173299.png

Vishnu_Nambrath_2-1667539195834.png

Example -->  OW and CW can be configured up to 1.6s by setting OW and CW to 31 and WDCYC to 1

You can also see the default values for this register with this you can calculate the default OW and CW duration. 

The window watchdog will become active in INIT state as soon as reset output pin ROT turns from low to high. After activation the watchdog opens a so called “Long Open Window” (LOW) of duration of tLOW. During the "Long Open Window” the window watchdog expects a valid triggering, which has to be provided via SPI in case the default configuration is kept, since any signal to watchdog trigger pin WDI is ignored. 

The microcontroller can change the configuration of the window watchdog during the “Long Open Window” to change the trigger selection as well as the times for the “Open” and “Closed Window”. With a reconfiguration the window watchdog will be restarted with the new configuration. A “Open Window” will be started accordingly, expecting a valid triggering by the selected triggering input.

Please let me know if you have any further questions. 

Regards 
Vishnu N

 

 

 

 

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1 Reply
Vishnu_Nambrath
Moderator
Moderator
Moderator
50 solutions authored 100 replies posted 5 likes given

Hello Ivelin, 

The duration of closed and open windows is configurable. 
Open window will be closed immediately after getting a trigger. So actual "Open window" will be less than the configured time.

Closed window will be closed after finishing its configured time. Hence always "Closed window" will have a fixed time. 

Duration of open window and closed window can be configured by using the below registers. 

Vishnu_Nambrath_0-1667539150423.png

Vishnu_Nambrath_1-1667539173299.png

Vishnu_Nambrath_2-1667539195834.png

Example -->  OW and CW can be configured up to 1.6s by setting OW and CW to 31 and WDCYC to 1

You can also see the default values for this register with this you can calculate the default OW and CW duration. 

The window watchdog will become active in INIT state as soon as reset output pin ROT turns from low to high. After activation the watchdog opens a so called “Long Open Window” (LOW) of duration of tLOW. During the "Long Open Window” the window watchdog expects a valid triggering, which has to be provided via SPI in case the default configuration is kept, since any signal to watchdog trigger pin WDI is ignored. 

The microcontroller can change the configuration of the window watchdog during the “Long Open Window” to change the trigger selection as well as the times for the “Open” and “Closed Window”. With a reconfiguration the window watchdog will be restarted with the new configuration. A “Open Window” will be started accordingly, expecting a valid triggering by the selected triggering input.

Please let me know if you have any further questions. 

Regards 
Vishnu N