R8355N NISSHINBO | Alldatasheet

Document overview

  • Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
  • PDF pages: 19

Technical content

Watchdog Timer with VD for Automotive Applications NO.EC-286-180529 OUTLINE The R8355N is a CMOS-based microprocessor supervisory circuit and have high accuracy and ultra low supply current voltage detector with built -in delay circuit and watchdog timer. When the supply voltage is down across the threshold, or the watchdog timer does not detect the system clock from the microprocessor, the reset output is generated. The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the accuracy is ±1.0%. The released delay time ( Power-on Reset Delay) circuit is built -in, and output delay time is adjustable with an external capacitor, and the accuracy is ±16%*1. When the supply voltage becomes higher than the released voltage, the reset state will be maintained during the delay time. The output type of the reset is selectable, Nch open-drain, or CMOS. The time out period of the watchdog timer can be also set with an external capacitor, and the accuracy is ±33% *1. There are another 4 products by the difference of packages and the function of voltage detector and watchdog timer. The package of R8355N is SOT-23-6. FEATURE < Volt age Detector Part >

  • Power-on R Adjustable by external capacitor
  • < Watchdog Timer Part > Adjustable by external capacitor Adjustable by external capacitor SOT-23-6 *1 Accuracy to center value of (Min.+Max.)/2

APPLICATIONS

  • Supervisory circuit for the power system of devices equipped with microprocessors .

NO.EC-286-180529 BLOCK DIAGRAMS R8355N xx1A R8355Nxx1C VDD GND SCK RESETB CD CTW WATCHDOG TIMER CLOCK DETECTOR Vref2 Vref1 VDD GND SCK RESETB CD CTW

1 WATCHDOG

The detector threshold, the output type and the taping type for the ICs can be selected at the user s’ request. The selection can be made with designating the part number as shown below; Pro duct Name Package Quantity per Reel Pb Free Halogen Free R8355Nxx1∗-TR-FE SOT-23-6 3,000 pcs Yes Yes xx : Set Detector Threshold (-VSET) can be designated in the range from 1.5V(15) to 5.5V(55) in 0.1V steps. ∗ : D esignation of Output Type (A) Nch Open Drain (C) CMOS R8 Aut omotive Class Code Operating Temperature Range Test Temperature AEC-Q100 −40°C to 125°C Low, 25°C, High Grade1

NO.EC-286-180529 SERIES SELECTION R8355N R5106N R5107G R5108G R5109G Package SOT-23-6 SSOP-8G With INH pin (Inhibit) No Yes 2 clock input No Yes With MR pin (Manual Reset) No Yes No With SENSE pin No Yes No Remarks CD pin and CTW pin are combined uses. Operating Voltage Range 1.5V to 6.0V Supply Current 11.5µA PIN DESCRIPTIONS

  • SOT-23-6 6 5 4 1 2 3 (mark side)
  • SOT-23-6 Pin No. Symbol Description

1 SCK Clock Input Pin from Microprocessor

2 CTW External Capacitor Pin for setting Reset and Watchdog Timer

3 VDD Power supply Pin

4 RESETB

Output Pin for Reset signal of Watchdog timer and Voltage Detector. (Output "L" at detecting Detector Threshold and Watchdog Timer Reset.)

5 GND Ground Pin

6 CD External Capacitor Pin for Setting delay time of Voltage Detector

NO.EC-286-180529 ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit VDD Supply Voltage -0.3 to 7.0 V VCD Output Voltage Voltage of CD Pin -0.3 to VDD + 0.3 V VCTW Voltage of CTW Pin -0.3 to VDD + 0.3 V VRESETB Voltage of RESETB Pin -0.3 to 7.0 V VSCK Input Voltage Voltage of SCK Pin -0.3 to 7.0 V IRESETB Output Current Current of RESETB Pin 20 mA PD Power Dissipation*1 (SOT-23-6, Standard Land Pattern) 525 mW Tj Junction Temperature -40 to 150 °C Tstg Storage Temperature Range -55 to 150 °C *1 For Power Dissipation, please refer to PACKAGE INFORMATION. ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings are not assured. RECOMMENDED OPERATING CONDITIONS Symbol Item Rating Unit VDD Operating Voltage 0.9 to 6.0 V Ta Operating Temperature Range −40 to 125 °C RECOMMENDED OPERATING CONDITIONS All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. The device electrical characteristics up to 125°C are evaluated at preproduction.

NO.EC-286-180529

ELECTRICAL CHARACTERISTICS

VDD=6.0V, CTW=0.1µF, CD=0.1µF, Pulled-up with 100kΩ on Nch Open Drain Output type (R8355Nxx1A), unless otherwise noted.

  • R8355Nxx1A/C ( −40°C ≤ Ta ≤ 110°C) Symbol Item Conditions Min. Typ. Max. Unit ISS Supply Current VDD= -VSET+0.5V, Clock pulse input 11 15 µA
  • VD Part Symbol Item Conditions Min. Typ. Max. Unit -VDET Detector Threshold V VHYS Detector Threshold Hysteresis -VDET ×0.03 -VDET ×0.05 -VDET ×0.07 V tPLH Output Delay Time CD =0.1µF *1 300 350 4 20 ms IRESETB Output Current (RESETB Output pin) Nch VDD = 1.2V VDS = 0.1V 0.38 0.8 mA Pch *2 VDD = 6.0V VDS = 0.5V 0.65 0.9 mA
  • WDT Part Symbol Item Conditions Min. Typ. Max. Unit tWD Watchdog Timeout Period CTW = 0.1µF *1 230 310 450 ms tWR Reset Hold Time of WDT CTW = 0.1µF *1 29 34 48 ms VSCKH SCK Input "H" VDD×0.8 6.0 V VSCKL SCK Input "L" 0 VDD×0.2 V tSCKW SCK Input Pulse Width VSCKL = VDD×0.2 VSCKH = VDD×0.8 500 ns *1 Not including the temperature characteristics of the external capacitor. *2 In case of CMOS type (R8355Nxx1C)

NO.EC-286-180529 Product-specific Electric Characteristics VD Part (−40°C ≤ Ta ≤ 110°C) Product Name -VDET [V] VHYS [V] Min. Typ. Max.

NO.EC-286-180529 TYPICAL APPLICATIONS R8355Ｎxx1A Typical Application R8355Ｎxx1C Typical Application R8355Nxx1A CD VDD RESET I/O R CTW GND VDD CD RESETB SCK CTW Microprocessor Power Supply R8355Nxx1C CD VDD RESET I/O CTW GND VDD CD RESETB SCK CTW Microprocessor Power Supply

NO.EC-286-180529 TECHNICAL NOTES When connecting resistors to the device’s input pin When connecting a resistor (R1) to an input of this device, the input voltage decreases by [Device’s Consumption Current] x [Resistance Value] only. And, the cross conduction current (1), which occurs when changing from the detecting state to the release state, is decreased the input voltage by [Cross Conduction Current] x [Resistance Value] only. And then, this device will enter the re-detecting state if the input voltage reduction is larger than the difference between the detector voltage and the released voltage. When the input resistance value is large and the VDD is gone up at mildly in the vicinity of the released voltage, repeating the above operation may result in the occurrence of output. As shown in Figure A/B, set R1 to become 100k Ω or less as a guide, and connect C IN(2) of 0.1μF and more to between the input pin and GND. Besides, make evaluations including temperature properties under the actual usage condition, with using the evaluation board like this way. As result, make sure that the cross conduction current has no problem. VDD GND OUT pin CIN(2） Figure A Voltage Detector VDD GND OUT pin CIN(2） Figure B Voltage Detector (1) In the CMOS output type, a charging current for OUT pin is included. (2) Note the bias dependence of capacitors.

NO.EC-286-180529 OPERATING DESCRIPTION

  • Timing Chart -VDET +VDET VRESETB tWR VCTW VSCK VDD Vref2H Vref2L tPLH VCD tPHL tPHL tPLH tWDI tWD -VTCD +VTCD Undefined Undefined VDDL (1) When the power supply, VDD pin voltage becomes more than the released voltage (+VDET), after the released delay time (or the power on reset time tPLH), the output of RESETB becomes "H" level. (2) When the SCK pulse is input, the watchdog timer (WDT) is cleared, and C TW pin mode changes from the discharge mode to the charge mode. When the C TW pin voltage becomes higher than V refH, the mode will change into the discharge mode, and next watchdog time count starts. (3) U nless the SCK pulse is input, WDT will not be cleared, and during the charging period of C TW pin, RESETB="L". (4) When the VDD pin becomes lower than the detector threshold voltage (-VDET), RESETB outputs "L". ∗) VTCD : Threshold voltage of CD pin when a power-on reset pulse inverting. ∗) Vref2H : CTW pin voltage at the end of WDT timeout period. ∗) Vref2L : CTW pin voltage at the begin of WDT timeout period.

NO.EC-286-180529

  • Watchdog Timeout Period/Reset Hold Time The watchdog timeout period and reset hold time can be set with an external capacitor to C TW pin. The next equations describe the relation between the watchdog timeout period and the external capacitor value, or the reset hold time and the external capacitor value. t WR (s) = tWD / 9 The watchdog timer (WDT) timeout period is determined with the discharge time of the external capacitor. During the watchdog timeout period, if the clock pulse from the system is detected, WDT is cleared and the capacitor is charged. When the charge of the capacitor completes, another watchdog timeout period starts again. During the watchdog timeout period, if the clock pulse from the system is not detected, during the next reset hold time RESETB pin outputs "L". On the reset time (that is, in charging the external capacitor) and the time period “t WDI” after the initiation of the watchdog timeout ( that is, after the discharge of the external capacitor is initiated), the clock pulse during their time period is ignored. tWDI (s) = tWD /10
  • Released Delay Time (Power-on Reset delay time) The released delay time can be set with an external capacitor connected to the C D pin. The next equation describes the relation between the capacitance value and the released delay time (t PLH). tPLH (s) =3.5 × 106 × C (F) When the V DD voltage becomes equal or less than ( -VDET), discharge of the capacitor connected to the C D pin starts. Therefore, if the discharge is not enough and V DD voltage returns to (+VDET) or more, thereafter the delay time will be shorter than tPLH which is expected. Power on Reset Operation against the input glitch (t PLH1<tPLH) VDD VCD VRESETB Complete Discharge +VDET -VDET +VTCD -VTCD tPLH1 tPLH Incomplete Discharge

NO.EC-286-180529

  • Minimum Operating Voltage The minimum operating voltage is specified as the minimum input voltage in which the condition of RESETB pin being 0.1V or lower than 0.1V (Herein, pull-up resistance is set as 100kΩ in the case of the Nch open-drain output type).
  • RESETB Output RESETB pin's output type is selectable either the Nch open- drain output or CMOS output. If the Nch open-drain type output is selected, the RESETB pin is pulled up with an external resistor to an appropriate voltage source.
  • Clock Pulse Input Built-in watchdog timer is cleared with the SCK clock pulse within the watchdog timeout period.

NO.EC-286-180529 TYPICAL CAHARACTERISTICS Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed. 1) Supply Current vs. Input Voltage R835xx151x R835xx301x 2) Detector Threshold vs. Temperature R835xx151x R835xx271x R835xx421x 0 1 2 3 4 5 6 Input Voltage VDD(V) Supply Current Iss ( µA) Ta=125℃ Ta=25℃ Ta=-40℃ 0 1 2 3 4 5 6 Input Voltage VDD(V) Supply Current Iss ( µA) Ta=125℃ Ta=25℃ Ta=-40℃ -40 -25 0 25 50 75 100 125 1.47 1.48 1.49 1.50 1.51 1.52 1.53 Detector Threshold -VDET (V) Ta (°C) -40-25 0 25 50 75 100 125 2.66 2.67 2.68 2.69 2.70 2.71 2.72 2.73 2.74 Ta (°C) Detector Threshold -VDET (V) -40-25 0 25 50 75 100 125 4.12 4.14 4.16 4.18 4.20 4.22 4.24 4.26 4.28 Ta (°C) Detector Threshold -VDET (V)

NO.EC-286-180529 3) Detector Threshold Hysteresis vs. Temperature R835xx151x R835xx271x R835xx421x 4) Nch Driver Output Current vs. VDS R835xx -40 -25 0 25 50 75 100 125 Ta (°C) Detector Threshold Hysteresys HYS (%) -40 -25 0 25 50 75 100 125 Ta (°C) Detector Threshold Hysteresys HYS (%) -40 -25 0 25 50 75 100 125 Ta (°C) Detector Threshold Hysteresys HYS (%) DD DD DD DD DD DD DD

NO.EC-286-180529 5) Nch Driver Output Current vs. Input Voltage R835xx R835xx 6) Pch Driver Output Current vs. Input Voltage R835xx R835xx R835xx VDS=0.3V 0 1 2 3 4 5 6 Input Voltage VDD (V) Ta=125℃ Ta=25℃ Ta=-40℃ Nch Driver Output Current IRESETB (mA) 0 1 2 3 4 5 6 Ta=125℃ Ta=25℃ Ta=-40℃ VDS=0.5V Nch Driver Output Current IRESETB (mA) Input Voltage VDD (V) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 4 5 6 Ta=-40℃ Ta=25℃ Ta=125℃ VDS=0.3V Pch Driver Output Current IRESETB (mA) Input Voltage VDD (V) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 4 5 6 Ta=-40℃ Ta=25℃ Ta=125℃ VDS=0.5V Pch Driver Output Current IRESETB (mA) Input Voltage VDD (V) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 4 5 6 Ta=-40℃ Ta=25℃ Ta=125℃ VDS=1.0V Pch Driver Output Current IRESETB (mA) Input Voltage VDD (V)

NO.EC-286-180529 7) Released Delay Time vs. Input Voltage 8 ) Released Delay Time vs. Temperature R835xx R835xx 9) Detector Output Delay Time vs. Temperature 10) WDT Reset Timer vs. Temperature R835xx R835xx 11) WDT Timeout Period vs. Temperature 12) WDT Reset Timer vs. Input Voltage R835xx R835xx 300 320 340 360 380 400 420 440 460 480 500 0 1 2 3 4 5 6 7 Input Voltage VDD [V] Ta=25°C Output Delay Time tPLH (ms) -40 -25 0 25 50 75 100 125 300 320 340 360 380 400 420 440 460 480 500 VDD=6V Ta (°C) Output Delay Time tPLH (ms) -40 -25 0 25 50 75 100 125 100 (-VDET)+1 (-VDET)- 1 1us Input Voltage Ta (°C) Detect Delay Time tPHL (ms) -40 -25 0 25 50 75 100 125 Ta (°C) WDT Reset Time tWR (ms) -40 -25 0 25 50 75 100 125 200 220 240 260 280 300 320 340 360 380 400 Operation Temperature Ta [°C] WDT TimeOut Period Time tWD (ms) 1 2 3 4 5 6 Input Voltage VDD (V) WDT Reset Time tWR (ms) (µs)

NO.EC-286-180529 13) WDT Timeout Period vs. Input Voltage 14) Output Delay Time vs. External Capacitance R835xx R835xx 200 220 240 260 280 300 320 340 360 380 400 1 2 3 4 5 6 Input Voltage VDD (V) WDT TimeOut Period Time tWD (ms) 0.001 0.01 0.1 100 1000 0.1 1 10 100 External Capacitance CD [nF] tPLH tPHL Delay Time tPLH/tPHL (ms) Input Voltage (-VDET )+1 (-VDET )-1 1us 1us

POWER DISSIPATION SOT-23-6 Ver. A i The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following conditions are used in this measurement. Measurement Conditions Standard Test Land Pattern Environment Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass Cloth Epoxy Plastic (Double-Sided Board) Board Dimensions 40 mm × 40 mm × 1.6 mm Copper Ratio Top Side: Approx. 50% Bottom Side: Approx. 50% Through-holes φ 0.5 mm × 44 pcs Measurement Result (Ta = 25°C, Tjmax = 150°C) Standard Test Land Pattern Free Air Power Dissipation 525 mW 310 mW Thermal Resistance θja = (150 − 25°C) / 0.525 W = 238°C/W 400°C / W IC Mount Area (mm) Power Dissipation vs. Ambient Temperature Measurement Board Pattern

PACKAGE DIMENSIONS SOT-23-6 Ver. A i 2.9±0.2 1.9±0.2 (0.95) (0.95) 6 4 1 2 3 1.6-0.1 +0.2 2.8±0.3 0.4-0.2 Unit : mm +0.1 0.8±0.1 1.1-0.1 +0.2 0 to 0.1 0.15-0.05 +0.1 0.2MIN.

  1. T he products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to our sales representatives for the latest information thereon. 2. The materials in this document may not be copied or otherwise reproduced in whole or in part without the prior written consent of us. 3. This product and any technical information relating thereto are subject to complementary export controls (so- called KNOW controls) under the Foreign Exchange and Foreign Trade Law, and related politics ministerial ordinance of the law. (Note that the complementary export controls are inapplicable to any application-specific products, except rockets and pilotless aircraft, that are insusceptible to design or program changes.) Accordingly, when exporting or carrying abroad this product, follow the Foreign Exchange and Foreign Trade Control Law and its related regulations with respect to the complementary export controls. 4. The technical information described in this document shows typical characteristics and example application circuits for the products. The release of such information is not to be construed as a warranty of or a grant of license under our or any third party's intellectual property rights or any other rights. 5. The products listed in this document are intended and designed for automotive applications. Those customers intending to use a product in an application requiring extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of the product could result in human injury or death should first contact us.
  • Aerospace Equipment
  • Equipment Used in the Deep Sea
  • Power Generator Control Equipment (nuclear, steam, hydraulic, etc.)
  • Life Maintenance Medical Equipment
  • Fire Alarms / Intruder Detectors
  • Vehicle Control Equipment (airplane, railroad, ship, etc.)
  • Various Safety Devices
  • Traffic control system
  • Combustion equipment In case your company desires to use this product for any applications other than general electronic equipment mentioned above, make sure to contact our company in advance. Note that the important requirements mentioned in this section are not applicable to cases where operation requirements such as application conditions are confirmed by our company in writing after consultation with y our company. 6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products are likely to fail with certain probability. In order to prevent any injury to persons or damages to property resulting from such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy feature, fire containment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or damage arising from misuse or inappropriate use of the products. 7. The products have been designed and tested to function within controlled environmental conditions. Do not use products under conditions that deviate from methods or applications specified in this datasheet. Failure to employ the products in the proper applications can lead to deterioration, destruction or failure of the products. We shall not be responsible for any bodily injury, fires or accident, property damage or any consequential damages resulting from misuse or misapplication of the products. 8. Quality Warranty 8-1. Quality Warranty Period In the case of a product purchased through an authorized distributor or directly from us, the warranty period for this product shall be one (1) year after delivery to your company. For defective products that occurred during this period, we will take the quality warranty measures described in section 8-2. However, if there is an agreement on the warranty period in the basic transaction agreement, quality assurance agreement, delivery specifications, etc., it shall be followed. 8-2. Quality Warranty Remedies When it has been proved defective due to manufacturing factors as a result of defect analysis by us, we will either deliver a substitute for the defective product or refund the purchase price of the defective product. Note that such delivery or refund is sole and exclusive remedies to your company for the defective product. 8-3. Remedies after Quality Warranty Period With respect to any defect of this product found after the quality warranty period, the defect will be analyzed by us. On the basis of the defect analysis results, the scope and amounts of damage shall be determined by mutual agreement of both parties. Then we will deal with upper limit in Section 8-2. This provision is not intended to limit any legal rights of your company. 9. Anti-radiation design is not implemented in the products described in this document. 10. The X-ray exposure can influence functions and characteristics of the products. Confirm the product functions and characteristics in the evaluation stage. 11. WLCSP products should be used in light shielded environments. The light exposure can influence functions and characteristics of the products under operation or storage. 12. Warning for handling Gallium and Arsenic (GaAs) products (Applying to GaAs MMIC, Photo Reflector). These products use Gallium (Ga) and Arsenic (As) which are specified as poisonous chemicals by law. For the prevention of a hazard, do not burn, destroy, or process chemically to make them as gas or power. When the product is disposed of, please follow the related regulation and do not mix this with general industrial waste or household waste. 13. Please contact our sales representatives should you have any questions or comments concerning the products or the technical information. Official website https://www.nisshinbo-microdevices.co.jp/en/ Purchase information https://www.nisshinbo-microdevices.co.jp/en/buy/