Document
S-1410/1411 Series
www.sii-ic.com © Seiko Instruments Inc., 2015
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.0_01
The S-1410/1411 Series is a watchdog timer developed using CMOS technology, which can operate with low current consumption of 3.8 μA typ. The reset function and the low voltage detection function are available.
Features
• Detection voltage: • Detection voltage accuracy: • Input voltage: • Hysteresis width: • Current consumption: • Reset time-out period: • Watchdog operation is switchable: • Watchdog operation voltage range: • Watchdog mode switching function*1: • Watchdog input edge is selectable: • Product type is selectable:
• Operation temperature range: • Lead-free (Sn 100%), halogen-free
2.0 V to 5.0 V, selectable in 0.1 V step
±1.5%
VDD = 0.9 V to 6.0 V 5% typ.
3.8 μA typ.
14.5 ms typ. (CPOR = 2200 pF) Enable, Disable
2.5 V to 6.0 V
Time-out mode, window mode
Rising edge, falling edge, both rising and falling edges
S-1410 Series___
________
(Product with W / T pin (Output: WDO pin))
S-1411 Series ___
_______
________
(Product without W / T pin (Output: RST pin, WDO pin))
Ta = −40°C to +105°C
*1. The S-1411 Series is fixed to the window mode.
Applications
• Power supply monitoring of microcontroller mounted apparatus and system monitoring
Package
• TMSOP-8
Seiko Instruments Inc.
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LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-1410/1411 Series
Rev.1.0_01
Block Diagrams
____
1. S-1410 Series (Product with W / T pin)
VDD WEN WDI W/T
Noise filter
Noise filter
Noise filter
CWDT WDT circuit
VSS
Reference voltage circuit
Voltage detection circuit
CPOR
Figure 1
____
2. S-1411 Series (Product without W / T pin)
CWDT
VDD
WDO
WEN WDI
Noise filter
Noise filter
WDT circuit
RST WDO
VSS
Reference voltage circuit
Voltage detection circuit
CPOR Figure 2
2 Seiko Instruments Inc.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.0_01
S-1410/1411 Series
Product Name Structure
Users can select the product types, detection voltage for the S-1410/1411 Series. Refer to "1. Product name" regarding the contents of product name, "2. Product type list" regarding the product types, "3. Package" regarding the package drawings.
1. Product name
S-141 x x xx - K8T2 U 4
Environmental code U: Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications*1 K8T2: TMSOP-8, Tape
Detection voltage 20 to 50 (e.g., when the detection voltage is 2.0 V, it is expressed as 20.)
Product type 1*2 A to L
Product type 2*3 0, 1
*1. Refer to the tape drawing.
*2. Refer to "2. Product type list"_.__ *3. 0: S-14_1__0___S__eries (Product with W / T pin)
The WDO pin outputs the signals which are from the watchdog timer circuit and the voltage detection
circuit.
___
1: S-14_1__1__S__e_ ries (Product without W / T pin)
The WDO pin outputs the signals which are from the watchdog timer circuit and the voltage detection
circui_t_._____ The RST pin outputs the signal which is from the voltage detection circuit.
The watchdog mode is fixed to the window mode.
Seiko Instruments Inc.
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LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-1410/1411 Series
Rev.1.0_01
2. Product type list
Product Type
A B C D E F G H I J K L
WEN Pin Logic
Active "H" Active "H" Active "H" Active "L" Active "L" Active "L" Active "H" Active "H" Active "H" Active "L" Active "L" Active "L"
Table 1 Input Edge
Rising edge Falling edge Both rising and falling edges Rising edge Falling edge Both rising and falling edges Rising edge Falling edge Both rising and falling edges Rising edge Falling edge Both rising and falling edges
Output Pull-up Resistor
Available Available Available Available Available Available Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable
3. Package
Package Name TMSOP-8
Table 2 Package Drawing Codes
Dimension
Tape
FM008-A-P-SD
FM008-A-C-SD
Reel FM008-A-R-SD
4 Seiko Instruments Inc.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
Rev.1.0_01
S-1410/1411 Series
Pin Configuration
1. TMSOP-8
Top view 18 27 36 45
Figure 3
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Table 3 S-1410 Series (Product with W / T pin)
Pin No. 1
Symbol
___
W
/ T*1
Description Watchdog mode switching pin
2
CPOR
Reset time-out period adjustment pin
3
CWDT
Watchdog time adjustment pin
4
VSS
GND pin
5
WEN
Watchdog enable pin
________
6
WDO
Watchdog output pin
7 WDI Watchdog input pin
8
VDD
Voltage input pin
___
*1. W___ / T pin = "H": Time-out mode
W / T pin = "L": Window mode
Table 4
Pin No. 1 2 3 4 5 6 7 8
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S-1411 Series (Product without W / T pin)
Symbol
_______
RST
Description Reset output pin
CPOR
Reset time-out period adjustment pin
CWDT
Watchdog time adjustment pin
VSS
GND pin
WEN
________
WDO
Watchdog enable pin Watchdog output pin
WDI Watchdog input pin
VDD
Voltage input pin
Seiko Instruments Inc.
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LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION
S-1410/141.