S-1410 Datasheet, PDF (22/36 Pages) Seiko Instruments Inc – Watchdog operation is switchable

LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-1410/1411 Series
Rev.2.0_00
7. Operation of low voltage detection
The voltage detection circui_{_}t_{__}d_{__}e_{__}te_{_} cts a low volt_{_}a_{__}g_{__}e_{__}if the power supply voltage falls below the detection voltage, and
then "L" is output from the WDO pin and the RST pin (Only the S-1411 Series). The output is maintained until the
charge-discharge operation of the CPOR pin is performed 4 times.
The S-1410/1411 Series can detect a low voltage even if either the C_{__}P_{_} OR pin or the WDT pin performs the
charge-discharge operation. In this case, the status of the WEN pin or the W / T pin does not have an affect.
VDD
CPOR
CWDT
12
1234
1234
1234
12
WDI
"H" or "L"
W/T
(S-1410 only)
WEN
(Active "H")
WDO
"H" or "L"
"H" or "L"^*1
RST
(S-1411 only)
Figure 38
*1. When the WEN pin is Disable, the charge-discharge operation of CWDT pin is not performed.
____
8. WEN pin, WDI pin and W / T pin
___
Each of the WEN pin, the WDI pin and the W / T pin has a noise filter.
If the power supply voltage is 5.0 V, noise with a minimum pulse width of 200 ns can be eliminated.
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