LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION

S-1410/1411 Series

Seiko Instruments Inc.

6



Pin Functions

Refer to " Operation" for details.

1. W

____

/ T pin (S-1410 Series only)

This is a pin to switch the watchdog mode.

The S-1410 Series changes to the time-out mode when the W

___

/ T pin is "H", and changes to the window mode

when the W

___

/ T pin is "L". Switching the mode is prohibited during the operation.

The W

___

/ T pin has a built-in pull-down resistor.

1. 1 Time-out mode (W

___

/ T pin = "H")

The S-1410 Series detects an abnormality when not inputting an edge to the WDI pin during the watchdog time-out

________

pin.

W / T

(S-1410 only)

WDI

(Rising edge)

WDO

"H"

Figure 4 Abnormality Detection in Time-out Mode

1. 2 Window mode (W

___

/ T pin = "L")

specific period of time (the discharge time due to an edge detection

inputting an edge to the WDI pin, the WDO

________

pin output changes from "H" to "L".

W / T

(S-1410 only)

WDI

(Rising edge)

WDO

"L"

Figure 5 Abnormality Detection in Window Mode

2. RST

________

pin (S-1411 Series only)

This is a reset output pin. It outputs "L" when detecting a low voltage.

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

_______

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

3. CPOR pin

The capacitor is charged and discharged by an internal constant current circuit, and the charge-discharge duration is