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www.sii-ic.com FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER © Seiko Instruments Inc., 2015 Rev.1.0_00 Seiko Instruments Inc. 1 The convenience timer is a CMOS timer IC which operates wi th low current consumption, and is suitable for the time management of the relative time. The S-35720 Series compares the timer value and the value set to the SET0 pin and the SET 1 pin, and outputs an interrupt signal when the values match each other. The timer is a 24-bit binary-up counter. 4 types of interrupt time can be selected depending on the SET0 pin and the SET1 pin settings. Caution This product can be used in vehicle equipment and in-vehicle equipment. Before using the product in the purpose, contact to SII is indispensable. Features
- Alarm interrupt function: Settable interrupt time Selectable as the option on the second time scale from 1 second to 194 days (Approximately half a year)
- Low current consumption: 0.2 μA typ. (Crystal oscillator: CL = 6 pF, VDD = 3.0 V, Ta = +25°C)
- Wide range of operation voltage: 1.8 V to 5.5 V
- Built-in 32.768 kHz crystal oscillation circuit
- Operation temperature range: Ta = −40°C to +125°C
- Lead-free (Sn 100%), halogen-free
- AEC-Q100 in process *1 *1. Contact our sales office for details. Application
- Time management of various systems during the sleep period Package
- TMSOP-8
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 2 Block Diagram Oscillation circuit Internal reset signal Chattering elimination circuit Divider, Timing generator INT pin controller Comparator Timer (24-bit) Interrupt time setting registor Power-on detection circuit Constant voltage circuit RST XIN XOUT VDD VSS INT SET0 SET1 Pull-up Figure 1
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.0_00 S-35720 Series Seiko Instruments Inc. 3 AEC-Q100 in Process Contact our sales office for details of AEC-Q100 reliability specification. Product Name Structure 1. Product name S-35720 x xx A - K8T2 U Environmental code U: Lead-free (Sn 100%), halogen-free Product name Operation temperature A: Ta = −40°C to +125°C Package abbreviation and IC packing specification*1 K8T2: TMSOP-8, Ta pe Option code 2*2 Option code 1 A: Crystal oscillator C L = 12.5 pF B: Crystal oscillator C L = 9 pF C: Crystal oscillator C L = 6 pF D: Crystal oscillator C L = others*3 *1. Refer to the tape drawing. *2. A sequence number added by the optional function that is user-selected. *3. Contact our sales office for details. 2. Package Table 1 Package Drawing Codes Package Name Dimension Tape Reel TMSOP-8 FM008-A-P-SD FM008-A-C-SD FM008-A-R-SD 3. Product name list Table 2 (1 / 2) Product Name RST Pin *1 INT Pin Output Form*2 Time-out Type*3 S-35720A01A-K8T2U Without pull-up resistor Nch open-drain output Handshake time-out S-35720C01A-K8T2U With pull-up resistor Nch open-drain output One-shot loop time-out Table 2 (2 / 2) Product Name SET0 Pin, SET1 Pin Settings (SET0, SET1) 0, 0 0, 1 1, 0 1, 1 S-35720A01A-K8T2U 60 seconds 10 seconds 30 seconds 1 second S-35720C01A-K8T2U 60 seconds 10 seconds 30 seconds 1 second *1. The pin with / without pull-up resistor is selectable. Refer to " Pin Functions". *2. The pin of Nch open-drain output / CMOS output is selectable. Refer to " Pin Functions". *3. The type of one-shot loop time-out / handshake time -out / toggle operation is selectable. Refer to " INT Pin Interrupt Signal Output ". Contact our sales office for the details of toggle operation. Remark Please contact our sales office for products with specifications other than the above.
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 4 Pin Configuration 1. TMSOP-8 Top view Figure 2 Table 3 List of Pins Pin No. Symbol Description I/O Configuration
1 RST
(With / without Pull-up resistor is selectable)
2 XOUT Connection pins for
crystal oscillator − −
3 XIN
4 VSS GND pin − −
5 INT Output pin for
interrupt signal Output Nch open-drain output / CMOS output is selectable
6 SET0 Input pins for
interrupt time setting Input CMOS input 7 SET1
8 VDD Pin for positive
power supply − −
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.0_00 S-35720 Series Seiko Instruments Inc. 5 Pin Functions 1. SET0, SET1 (Input for interrupt time setting) pins These pins input the interrupt time setting signal. The setting signals are input when the RST pin changes from "L" to "H". As a result, interrupt time does not change even if the SET0 pin and the SET1 pin change during timer operation. In one-shot loop time-out and handshake time-out, 4 types of interrupt time can be selected depending on the pin settings. Interrupt time of the timer can be selected as the option on the second time scale from 1 second to 194 days (Approximately half a year). 2. RST (Input for reset signal) pin This pin inputs the reset signal. The timer is reset when inputting "L" to the RST pin. The INT pin is set to "H" when inputting "H" to the RST pin, and the timer starts the operation. Moreover, the RST pin with / without pull-up resistor can be selected. 3. INT (Output for interrupt signal) pin This pin outputs an interrupt signal. The interrupt signal is output when the time set to the SET0 pin and the SET1 pin comes. The interrupt signal output (time-out type) of one-shot loop time-out / handshake time-out / toggle operation*1 can be selected as the option. Regarding the operation of the inte rrupt signal output, refer to " INT Pin Interrupt Signal Output". Moreover, the INT pin output form of Nch open-drain output / CMOS output can be selected. *1. Contact our sales office for the details of toggle operation. 4. XIN, XOUT (Connection for crystal oscillator) pins Connect a crystal oscillator between the XIN pin and the XOUT pin. 5. VDD (Positive power supply) pin Connect this pin with a positive power supply. Regarding the values of voltage to be supplied, refer to " Recommended Operation Conditions". 6. VSS pin Connect this pin to GND.
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.0_00 S-35720 Series Seiko Instruments Inc. 7 Absolute Maximum Ratings Table 4 Item Symbol Applied Pin Abso lute Maximum Rating Unit Power supply voltage V DD − V SS − 0.3 to VSS + 6.5 V Input voltage V IN SET0, SET1, RST *1 VSS − 0.3 to VSS + 6.5 V RST *2 VSS − 0.3 to VDD + 0.3 ≤ VSS + 6.5 V Output voltage V OUT INT *3 VSS − 0.3 to VSS + 6.5 V INT *4 VSS − 0.3 to VDD + 0.3 ≤ VSS + 6.5 V Operation ambient temperature*5 Topr − −40 to +125 °C Storage temperature T stg − −55 to +150 °C *1. When the product without a pull-up resistor is selected. *2. When the product with a pull-up resistor is selected. *3. When Nch open-drain output is selected. *4. When CMOS output is selected. *5. Conditions with no condensation or fr ost. Condensation or frost causes short- circuiting between pins, resulting in a malfunction. 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. Recommended Operation Condition Table 5 (VSS = 0 V) Item Symbol Condition Min. Typ. Max. Unit Operation power supply voltage V DD Ta = −40°C to +125°C 1.8 − 5.5 V Oscillation Characteristics Table 6 (Ta = +25°C, VDD = 3.0 V, VSS = 0 V unless otherwise specified) (Crystal oscillator (NX3215SA, CL = 6 pF) manufactured by Nihon Dempa Kogyo Co., Ltd.) Item Symbol Condition Min. Typ. Max. Unit Oscillation start voltage V STA Within 10 seconds 1.8 − 5.5 V Oscillation start time t STA − − − 1 s IC-to-IC frequency deviation*1 δIC − −20 − +20 ppm *1. Reference value
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 8 DC Electrical Characteristics Table 7 (Ta = −40°C to +125°C, VSS = 0 V unless otherwise specified) (Crystal oscillator (NX3215SA, CL = 6 pF) manufactured by Nihon Dempa Kogyo Co., Ltd.) Item Symbol Applied Pin Condition Min. Typ. Max. Unit Current consumption 1 IDD1 − VDD = 3.0 V, Ta = −40°C to +85°C, RST pin = VDD, INT pin = no load − 0.2 0.35 μA VDD = 3.0 V, Ta = +125°C, RST pin = V DD, INT pin = no load − 0.7 0.95 μA High level input leakage current IIZH SET0, SET1, RST VIN = VDD −0.5 − 0.5 μA Low level input leakage current IIZL SET0, SET1, RST *1 VIN = VSS −0.5 − 0.5 μA High level output leakage current IOZH INT *2 VOUT = VDD −0.5 − 0.5 μA Low level output leakage current IOZL INT *2 VOUT = VSS −0.5 − 0.5 μA High level input voltage VIH SET0, SET1, RST − 0.7 × VDD − V SS + 5.5 V Low level input voltage VIL SET0, SET1, RST − V SS − 0.3 − 0.3 × VDD V High level output voltage*3 VOH INT IOH = −0.4 mA 0.8 × VDD − − V Low level output voltage VOL INT IOL = 2.0 mA − − 0.4 V Low level input current*4 IIL RST VDD = 3.0 V, VIN = VSS −100 −30 −5 μA *1. When the product without a pull-up resistor is selected. *2. When Nch open-drain output is selected. *3. When CMOS output is selected. *4. When the product with a pull-up resistor is selected.
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.0_00 S-35720 Series Seiko Instruments Inc. 11 Power-on Detection Circuit In order for the power-on detection circuit to operate normally, raise the power supply voltage of the IC from 0.2 V or lower so that it reaches 1.8 V of the operation power supply voltage minimum value within 10 ms, as shown in Figure 12. Within 10 ms 1.8 V (Operation power supply voltage min.)
0 V*1
0.2 V or lower
*1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series. Figure 12 How to Raise the Power Supply Voltage If the power supply voltage of the S-35720 Series cannot be raised under the above conditions, the power-on detection circuit may not operate normally and an oscillation may not start *1. In such case, perform the operations shown in "1. When power supply voltage is raised at RST pin = "L" " and "2. When power supply voltage is raised at RST pin = "H" ". *1. When one-shot loop time-out or handshake time-out is selected as the option. 1. When power supply voltage is raised at RST pin = "L" Set the RST pin to "L" until the power supply voltage reaches 1.8 V or higher. While the RST pin is set to "L", the oscillation start signal becomes "H", and the oscillation circuit normally oscillates. If the RST pin is set to "H" after the power supply voltage reaches 1.8 V, the oscillation start signal becomes "L" within 500 ms, and the oscillation status is maintained. The current consumption increases as mentioned below while the RST pin is set to "L".
- When the product without a pull-up resistor is selected: 1.7 μA typ.
- When the product with a pull-up resistor is selected: 30 μA typ.
Oscillation circuit output 10 ms Oscillation start signal "H" "L" within 500 ms 1.8 V (Operation power supply voltage min.) *1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series. Figure 13 When Power Supply Voltage is Raised at RST Pin = "L"
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 12 2. When power supply voltage is raised at RST pin = "H" Set the RST pin to "L" after the power supply voltage reaches 1.8 V or higher. If the RST pin is set to "L" for 500 ms or longer, the oscillation start signal becomes "H", and the oscillation circuit normally oscillates. After that, if the RST pin is set to "H", the oscillation start signal becomes "L" within 500 ms, and the oscillation status is maintained. The current consumption increases as mentioned below while the RST pin is set to "L".
- When the product without a pull-up resistor is selected: 1.7 μA typ.
- When the product with a pull-up resistor is selected: 30 μA typ. 10 ms 07*1 1.8 V
Oscillation circuit output (Operation power supply voltage min.) Oscillation start signal within 500 ms *1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series. Figure 14 When Power Supply Voltage is Raised at RST Pin = "H"
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 14 Examples of Application Circuit VIN VOUT VSS VR VDD VSS SET1 RST INT XIN XOUT S-35720 VCC VSS
12 V CPU
10 k 10 k 10 k 10 k VCC Figure 16 Caution The above connection diagrams do not guarantee operation. Set the constants after performing sufficient evaluation using the actual application.
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER S-35720 Series Rev.1.0_00 Seiko Instruments Inc. 16 Cautions When Using Crystal Oscillator Request a crystal oscillator maker for a matching assessment of the IC and the crystal. Refer to Table 8 for recommended crystal characteristics value. When using the product in an environment over Ta = +85°C, it is recommended to ensure the oscillation allowance shown in Table 8 at room temperature. Table 8 Crystal Characteristics Crystal Oscillator CL Value (Load Capacitance) R1 Value (Equivalent Series Resistance) Oscillation Allowance at Power-on 12.5 pF 80 k Ω max. 5 times or more 9.0 pF 80 k Ω max. 5 times or more 6.0 pF 80 k Ω max. 5 times or more Precautions
- 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 ou t of or in connection with any infringement by products including this IC of patents owned by a third party.
FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.0_00 S-35720 Series Seiko Instruments Inc. 17 Characteristics (Typical Data) 1. Current consumption 1 vs. Power supply voltage characteristics 2. Current consumption 1 vs. Temperature characteristics Ta = +25°C, CL = 6 pF Ta = +25°C, CL = 6 pF 0.0 1.0 0.8 0.6 0.4 0.2 420 IDD1 [A] VDD [V] 0.8 40 25 0 25 50 75 100 125 Ta [C] 0.0 IDD1 [A] 0.6 0.4 0.2 VDD = 5.0 V VDD = 3.0 V 3. Crystal oscillator frequency vs. Power supply voltage characteristics 4. Crystal oscillator frequency vs. Temperature characteristics Ta = +25°C, CL = 6 pF CL = 6 pF 20 10 420 f/f [ppm] VDD [V] 40 25 0 25 50 75 100 125450 50 150 250 350 f/f [ppm] Ta [C] 100 200 300 400 5. Low level output current vs. Output voltage characteristics 6. High level output current vs. V DD − VOUT characteristics INT pin, SDA pin, Ta = +25°C INT pin, Ta = +25°C CMOS output 420 IOL [mA] VOUT [V] VDD = 5.0 V VDD = 3.0 V 25 420 IOH [mA] VDD VOUT [V] 10 15 20 VDD = 3.0 V VDD = 5.0 V 7. Low level input current vs. Power supply voltage characteristics RST pin, Ta = +25°C Product with pull-up resistor 60 420 IIL [A] 30 40 50 20 10 VDD [V]
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- The information described herein is subject to change without notice.
- Seiko Instruments Inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design.
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