TCAN1469-Q1: TCAN1469-Q1 WWD

Yi,

I'm not sure I understand why the MCU needs to provide its own enable signal to the DCDC. Could you help clarify the intent of this line "FROM MCU"?

Best,

Danny

Dear Danny,

I am afraid of the bus sleep message can't be received by MCU before INH goes to low, so I added enable signal from MCU to ensure all staffs are ready before goes to sleep mode.

By the way , I would like to ask what state of INH after power on when MCU has no software ?

Thank you !

Dear Danny,

Thank you for you reply!

Could you help answer my question which I mention first?

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Dear TI Team,

Here is question about Window watch dog of TCAN 1469-Q1,

Basic requirement:

a/ use INH pin as enable signal of DCDC ( DCDC output 3v3 supply to MCU)

b/ Window Watch Dog is needed for whose system

As far as I know watch dog reset signal is also via INH pin (turn off INH 300ms) , so I am worry about whether the 2 functions is contradictory via INH PIN in my system or what shall add in current design?

My concept like below : my MCU power supply's enable signal is come from INH signal 1st , afterwards the MCU is work , then the MCU will generate a separate enable signal for MCU power , 

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Thanks!

Dear Danny,

Therefore, there is no contradiction between these two functions (WG / Enable signal of system power). If the watchdog counter exceeds its limit, the entire system will be reset and then recover after a duration of 300 ms.

Am I understanding this correctly? Thank you!

Thanks!

Yi,

Yes, it sounds like you are understanding correctly.

Of course, please let us know if any other questions come up.

Best,

Danny