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S-1411N20-A8T1U4 Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-1411N20-A8T1U4 Datasheet(HTML) 7 Page - Seiko Instruments Inc |
7 / 36 page LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.2.0_00 S-1410/1411 Series 7 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 constant current source (0.3 μA typ.) is connected to the W ___ / T pin, and it is pulled down internally. 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 period (tWDU). And then "L" is output from the WDO ________ pin. W / T (S-1410 only) WDI (Rising edge) WDO tWDU tRST "H" Figure 5 Abnormality Detection in Time-out Mode 1. 2 Window mode (W ___ / T pin = "L") When not inputting an edge to the WDI pin during tWDU, or when an edge is input to the WDI pin again within a specific period of time (the discharge time due to an edge detection + 1 charge-discharge time (tWDL)) after 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 tWDU tRST "L" tRST tWDL Figure 6 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 This is a pin to connect an external capacitor in order to generate the reset time-out period (tRST). The capacitor is charged and discharged by an internal constant current circuit, and the charge-discharge duration is tRST. tRST is calculated by using the following equation. tRST = 6,500,000 × CPOR [F] + 0.0002 |
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