TPS7B68-Q1: pin connection check

Hi Yamamoto-san,

1. Your configuration is good for standard watchdog mode.
2. It depends your battery voltage, WTS can be pulled high directly to battery to enable standard watchdog if your battery is less than 7V.
3. Power-good threshold-adjustment pin. Connect a resistor divider between the PGADJ and OUT pins to set the power-good threshold. Connect this pin to ground to set the threshold to 91.6% of output voltage VOUT. If you are okay with default setup, you don't have to use resistor divider.
4. PG is an output pin, it's okay to leave it open if you don't need to use it.
5. It depends your battery voltage, if your battery voltage is less than 7V. It should be okay.
6. Window ratio-selection pin (only applicable for the window watchdog). Pull this pin down to a low level to set the open:closed window ratio to 1:1. Pull this pin up to high level to set the open:closed window ratio to 8:1.

Regards,
Jason Song

Hi Yamamoto-san, 

When you try to connect some pins to battery, please make sure it won't exceed its maximum voltage ratings. 

Regards, 
Jason Song

Hi Jason-san,

Thank you for your answers.
I would like to re-check two things.

>About 2 and 5,
You mentioned that ' if your battery voltage is less than 7V. It should be okay', but WTS and FSEL pins have 40V absolute maximum ratings.
So that, I think these pins should be okay if our battery voltage is less than 40V.
Is my understanding correct?

>About 6,
I would like to use this pin as open because I will not use window watchdog.
Will to be open this pin happen something problem?

Best regards,