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www.sii-ic.com LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION © Seiko Instruments Inc., 2015 Rev.1.0_01 Seiko Instruments Inc. 1 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: 2.0 V to 5.0 V, selectable in 0.1 V step
- Detection voltage accuracy: ±1.5%
- Input voltage: V DD = 0.9 V to 6.0 V
- Hysteresis width: 5% typ.
- Current consumption: 3.8 μA typ.
- Reset time-out period: 14.5 ms typ. (C POR = 2200 pF)
- Watchdog operation is switchable: Enable, Disable
- Watchdog operation volta ge range: 2.5 V to 6.0 V
- Watchdog mode switching function *1: Time-out mode, window mode
- Watchdog input edge is selectable: Rising edge, falling edge, both rising and falling edges
- Product type is selectable: S-1410 Series (Product with W ___ / T pin (Output: WDO pin)) S-1411 Series (Product without W ___ / T pin (Output: RST pin, WDO pin))
- Operation temperature range: Ta = −40°C to +105°C
- Lead-free (Sn 100%), halogen-free *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
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.1.0_01 S-1410/1411 Series Seiko Instruments Inc. 3 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 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.) Environmental code U: Lead-free (Sn 100%), halogen-free Product type 2*3 0, 1 Product type 1*2 A to L *1. Refer to the tape drawing. *2. Refer to " 2. Product type list ". *3. 0: S-1410 Series (Product with W ___ / T pin) The WDO pin outputs the signals which are from the wa tchdog timer circuit and the voltage detection circuit. 1: S-1411 Series (Product without W ___ / T pin) The WDO pin outputs the signals which are from the wa tchdog timer circuit and the voltage detection circuit. The RST pin outputs the signal which is from the voltage detection circuit. The watchdog mode is fixed to the window mode.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION S-1410/1411 Series Rev.1.0_01 Seiko Instruments Inc. 4 2. Product type list Table 1 Product Type WEN Pin Logic Input Edge Output Pull-up Resistor A Active "H" Rising edge Available B Active "H" Falling edge Available C Active "H" Both rising and falling edges Available D Active "L" Rising edge Available E Active "L" Falling edge Available F Active "L" Both rising and falling edges Available G Active "H" Rising edge Unavailable H Active "H" Falling edge Unavailable I Active "H" Both rising and falling edges Unavailable J Active "L" Rising edge Unavailable K Active "L" Falling edge Unavailable L Active "L" Both rising and falling edges Unavailable 3. Package Table 2 Package Drawing Codes Package Name Dimension Tape Reel TMSOP-8 FM008-A-P-SD FM008-A-C-SD FM008-A-R-SD
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.1.0_01 S-1410/1411 Series Seiko Instruments Inc. 5 Pin Configuration 1. TMSOP-8 Top view Figure 3 Table 3 S-1410 Series (Product with W ___ / T pin) Pin No. Symbol Description 1 W ___ / T *1 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
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 S-1411 Series (Product without W ___ / T pin) Pin No. Symbol Description
1 RST
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.1.0_01 S-1410/1411 Series Seiko Instruments Inc. 7 4. CWDT pin This is a pin to connect an external capacitor in order to generate the watchdog time-out period (t WDU) and the watchdog double pulse detection time (t WDL). The capacitor is charged and discharged by an internal constant current circuit. t WDU is calculated by using the following equation. tWDU = 50,000,000 × CWDT [F] + 0.0011 Moreover, tWDL is calculated by using the following equation. tWDL = tWDU 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 WEN pin has a built-in pull-down resistor. 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 WDI pin has a built-in pull-down resistor.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION S-1410/1411 Series Rev.1.0_01 Seiko Instruments Inc. 8 Absolute Maximum Ratings Table 5 (Ta = +25°C unless otherwise specified) Item Symbol Abso lute Maximum Rating Unit VDD pin voltage V DD VSS − 0.3 to VSS + 7.0 V WDI pin voltage V WDI VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V WEN pin voltage V WEN VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V W ___ / T pin voltage Vw ___ / T VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V CPOR pin voltage V CPOR VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V CWDT pin voltage V CWDT VSS − 0.3 to VDD + 0.3 ≤ VSS + 7.0 V RST pin voltage VRST VSS − 0.3 to VDD + 0.3 V WDO pin voltage VWDO V SS − 0.3 to VDD + 0.3 V Operation ambient temperature T opr −40 to +105 °C Storage temperature T stg −40 to +150 °C Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Thermal Resistance Value Table 6 Item Symbol Condition Min. Typ. Max. Unit Junction-to-ambient thermal resistance *1 θja TMSOP-8 Board 1 − 160 − °C/W Board 2 − 133 − °C/W *1. Test environment: compliance with JEDEC STANDARD JESD51-2A Remark Refer to " Thermal Characteristics " for details of power dissipation and test board.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.1.0_01 S-1410/1411 Series Seiko Instruments Inc. 9 Electrical Characteristics Table 7 (WEN pin logic active "H" product, V DD = 5.0 V, Ta = +25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Test Circuit Detection voltage*1 −VDET − −VDET(S) × 0.985 −VDET(S) −VDET(S) × 1.015 V 1 Hysteresis width V HYS − −VDET × 0.03 −VDET × 0.05 −VDET × 0.07 V 1 Current consumption during operation ISS1 When watchdog timer operates − 3.8 7.8 μA 2 Reset time-out period tRST CPOR = 2200 pF 8.7 14.5 20 ms 3 Watchdog time-out period tWDU CWDT = 470 pF 15 24.6 34 ms 3 Watchdog double pulse detection time tWDL C WDT = 470 pF 461 769 1077 μs 4 Reset output voltage "H" V ROH S-1411 Series A / B / C / D / E / F type only VDD − 1.0 − − V 5 Reset output voltage "L" V ROL − − − 0.4 V 6 Reset output pull-up current I RUP VRST = 0 V, S-1411 Series A / B / C / D / E / F type only − −0.85 −0.4 μ A 7 Reset output current I ROUT VDS = 0.4 V, S-1411 Series only V DD = 1.5 V 0.6 1.1 − mA 8 VDD = 1.8 V 1.1 1.6 − mA 8 VDD = 2.5 V 2.1 2.6 − mA 8 VDD = 3.0 V 2.8 3.3 − mA 8 Reset output leakage current I RLEAK VDS = 6.0 V, VDD = 6.0 V, S-1411 Series only − − 0.096 μA 9 Watchdog output voltage "H" V WOH A / B / C / D / E / F type only VDD − 1.0 − − V 10 Watchdog output voltage "L" V WOL − − − 0.4 V 11 Watchdog output pull-up current IWUP VWDO = 0 V, A / B / C / D / E / F type only − −0.85 −0.4 μ A 12 Watchdog output current I WOUT V DS = 0.4 V VDD = 1.5 V 0.6 1.1 − mA 13 VDD = 1.8 V 1.1 1.6 − mA 13 VDD = 2.5 V 2.1 2.6 − mA 13 VDD = 3.0 V 2.8 3.3 − mA 13 Watchdog output leakage current IWLEAK V DS = 6.0 V, VDD = 6.0 V − − 0.096 μA 14 Input pin voltage 1 "H" V SH1 WEN pin, WDI pin 0.7 × VDD − − V 15 Input pin voltage 1 "L" V SL1 WEN pin, WDI pin − − 0.3 × VDD V 15 Input pin voltage 2 "H" V SH2 W ___ / T pin, S-1410 Series only 0.7 × VDD − − V 15 Input pin voltage 2 "L" V SL2 W ___ / T pin, S-1410 Series only − − 0.3 × VDD V 15 Input pulse width "H" t high1 − 1.5 − − μ s 15 Input pulse width "L" t low1 − 1.5 − − μ s 15 Watchdog output delay time t WOUT − − 25 40 μs 3 Reset output delay time t ROUT − − 25 40 μs 3 Input setup time t iset − 1.0 − − μs 3 *1. −VDET: Actual detection voltage, −VDET(S): Set detection voltage
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION S-1410/1411 Series Rev.1.0_01 Seiko Instruments Inc. 20 7. Operation of low voltage detection The voltage detection circuit detects a low voltage if the pow er 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 CPOR 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. "H" or "L" "H" or "L" "H" or "L" VDD CPOR CWDT WDI W / T WEN WDO RST (Active "H") (S-1411 only) (S-1410 only) 12 1234 1234 1234 12 Figure 36 *1. When the WEN pin is Disable, the charge-disc harge 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.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION S-1410/1411 Series Rev.1.0_01 Seiko Instruments Inc. 22 Precautions
- It will take time for the discharge operati on to be performed if the capacitance of C POR is extremely large at the low voltage detection, so the discharge op eration may not be completed by the time the power supply voltage exceeds the detection voltage. In that case, since the charge-disc harge operation of the CPOR pin is performed after the discharge operation is completed, the delay time of the sa me time length as the discharge operation occurs in reset time-out period (tRST).
- Select a capacitor which satisfies the following equation for C POR and C WDT. If this condition is not satisfied, the delay time of the same time length as the discharge operation occurs in t RST since the discharge operation of an external capacitor connected to the CWDT pin is not completed by the time the CWDT pin initiates the next charge-discharge operation. CWDT / CPOR ≤ 600
- When the power supply voltage falls to 0.9 V or lower, set a time interval of 20 μs or longer by the time the power supply is raised again. If the appropriate time length is not secured, the time-out period after raising the power supply voltage may get delayed.
- When the time that the power supply voltage falls belo w the detection voltage is short, the S-1410/1411 Series may not detect a voltage. In that case, the time-out period after raising the power supply voltage may get delayed.
- Since input pins (the WEN pin, the WDI pin and the W ___ / T pin) in the S-1410/1411 Series are CMOS configurations, make sure that an intermediate potential is not input when the S-1410/1411 Series operates.
- Since the WDO pin and the RST pin are affected by external resistance and external capacitance, use the S-1410/1411 Series after performing thorou gh evaluation with the actual application.
- Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit.
- SII claims no responsibility for any disputes arising out of or in connection with any infringement by products including this IC of patents owned by a third party.
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION Rev.1.0_01 S-1410/1411 Series Seiko Instruments Inc. 23 Characteristics (Typical Data) 1. Current consumption during operation (I SS1) vs. Input voltage (V DD) WDT = OFF, −VDET(S) = 4.0 V, Ta = +25°C 024 0.0 5.0 3.0 2.0 1.0 ISS1 [A] VDD [V] 4.0 WDT = ON, −VDET(S) = 4.0 V, Ta = +25°C, WDI input 4.0 5.0 6.0 3.0 5.54.5 6.5 5.0 4.5 4.0 3.5 ISS1 [A] VDD [V] Ta = +25C Ta = +105C Ta = 40C 2. Current consumption during operation (I SS1) vs. Temperature (Ta) 3. Detection voltage ( −VDET), Release voltage (+VDET) vs. Temperature (Ta) WDT = ON, −VDET(S) = 4.0 V, VDD = 5.0 V, WDI input 25 0 25 50 75 10540 0.0 5.0 Ta [C] 4.0 3.0 2.0 1.0 ISS1 [A] −VDET(S) = 4.0 V 25 0 25 50 75 10540 3.5 3.0 Ta [C] 4.5 4.0 VDET, +VDET [V] +VDET VDET 4. Reset time-out period (t RST) vs. Temperature (Ta) 5. Watchdog time-out period (t WDU) vs. Temperature (Ta) VDD = 5.0 V, CPOR = 2200 pF 25 02 5 5 0 7 5 10540 Ta [C] tRST [ms] VDD = 5.0 V, CWDT = 470 pF 25 0 25 50 75 10540 Ta [C] tWDU [ms] 6. Reset output delay time (t ROUT) vs. Temperature (Ta) 7. Watchdog output delay time (t WOUT) vs. Temperature (Ta) VDD = −VDET(S) + 1.0 V → −VDET(S) − 1.0 V, CPOR = 2200 pF 25 0 25 50 75 10540 Ta [C] tROUT [s] VDD = 5.0 V, CWDT = 470 pF 25 0 25 50 75 10540 Ta [C] tWOUT [s]
LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION S-1410/1411 Series Rev.1.0_01 Seiko Instruments Inc. 24 8. Reset time-out period (t RST) vs. CPOR 9. Watchdog time-out period (t WDU) vs. CWDT VDD = 5.0 V, Ta = +25°C 0.0001 tRST [s] 0.0001 CPOR [F] 0.01 0.1 10.001 0.10.01 0.001 VDD = 5.0 V, Ta = +25°C 0.0001 tWDU [s] 0.001 CWDT [F] 100 0.1 10.001 0.10.01 0.01 10. Nch driver output current (I WOUT) vs. Input voltage (V DD) VDS = 0.4 V, −VDET(S) = 4.0 V 024 2.0 315 6.0 4.0 IWOUT [mA] VDD [V] Ta = +105C Ta = +25C Ta = 40C 0.0
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