FOR AUTOMOTIVE 125°C OPERATION LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION

S-19400/19401 Series

8

4. CWDT pin

current circuit.

32

5. WEN pin

This is a pin to switch Enable / Disable of the watchdog timer.

When the WEN pin logic is active "H", the watchdog timer becomes Enable if the input is "H", and the

charge-discharge operation is performed at the CWDT pin. In the active "H" product, the constant current source

(0.3

μA typ.) is connected to the WEN pin, and it is pulled down internally.

6. WDO

_________

pin

This pin combines the reset output and the watchdog output.

Be sure to connect a pull-up resistor to the WDO

________

pin in the product without an output pull-up resistor.

7. WDI pin

This is an input pin to receive a signal from the monitored object. By being input an edge at an appropriate timing, the

WDI pin confirms the normal operation of the monitored object.

The constant current source (0.3

μA typ.) is connected to the WDI pin, and it is pulled down internally.