R5108G

Microprocessor Supervisory Circuit R5108G SERIES OUTLINE NO. EA-171-070711 The R5108G Series are CMOS-based µ con supervisory circuit, or high accuracy and ultra low supply current voltage detector with built-in delay and watchdog timer. When the SENSE voltage is down across the threshold, or the watchdog timer does not detect the system clock from the µ con, the reset output is generated. The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the tolerance 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. When the sense voltage becomes the released voltage, the reset state will be maintained during the delay time. The time out period of the watchdog timer can be also set with an external capacitor. The output type of the reset is selectable, Nch open-drain, or CMOS. There is a function to stop supervising clock by the watchdog timer (INH function). A necessary voltage source can be supervised with SENSE pin. The package is small SSOP-8G. FEATURES • Built-in a watchdog timer's time out period accuracy ±30% • Timeout period for watchdog and generating a reset signal can be set by an external capacitor • Detector Threshold Voltage ····························· 0.1V stepwise setting in the range from 1.5V to 5.5V • Supply current ·················································· Typ. 11µA • Operating Voltage ············································ 1.5V to 6.0V • High Accuracy Output Voltage of Detector Threshold ············································· ±1.0% • Power-on Reset Delay Time accuracy············· ±20% • Power-on reset delay time of the voltage detector can be set with an external capacitor. • Small Package ················································· SSOP-8G (0.65mm pitch) APPLICATION • Supervisory circuit for equipment with using microprocessors. 1 R5108G BLOCK DIAGRAMS SENSE VDD + CD - + GND WATCHDOG TIMER CLOCK DETECTOR TW SCK RESETB INH R5108GxxxA SENSE VDD + CD - + GND WATCHDOG TIMER CLOCK DETECTOR TW SCK RESETB INH R5108GxxxC 2 R5108G SELECTION GUIDE The selection can be made with designating the part number as shown below: R5108Gxx1x-TR ↑ ↑↑ ↑ a bcd Code a b c d Descriptions Designation of Package Type; G: SSOP8G (2.9mmx4.0mm) Designation of Detector Threshold Voltage (-VDET) 0.1V stepwise setting is possible in the range from 1.5V to 5.5V Designation of the output type of RESETB A: Nch Open-drain C: CMOS Output Designation of Taping Type ←part Number PIN CONFIGURATION RESETB SENSE CD GND 1 2 3 R5108GxxxA R5108GxxxC 8 7 6 VDD TW INH SCK SSOP8G (0.65mm pitch) PIN DESCRIPTION Pin No 1 2 3 4 5 6 7 8 Symbol RESETB SENSE CD GND SCK INH TW VDD Pin Description Output Pin for Reset signal of Watchdog timer and Voltage Detector. (Output “L” at detecting Detector Threshold and Watchdog Timer Reset.) Voltage Detector Voltage Sense Pin External Capacitor Pin for Setting Delay Time of Voltage Detector Ground Pin Clock Input Pin from Microprocessor Inhibit Pin ("L": Inhibit the watchdog timer) External Capacitor Pin for Setting Reset and Watchdog Timeout Periods Power supply Pin 3 R5108G ABSOLUTE MAXIMUM RATINGS Topt=25°C, VSS=0V Symbol VIN VCD VTW VRESETB VSCK VINH VSENSE IRESETB PD Topt Tstg Output Current Power Dissipation Input Voltage Output Voltage Supply Voltage Item Rating -0.3∼7.0 -0.3∼VIN+0.3 -0.3∼VIN+0.3 -0.3∼7.0 -0.3∼7.0 -0.3∼7.0 -0.3∼7.0 20 300 -40∼+105 -55∼+125 Unit V V V V V V V mA mW °C °C Voltage of CD Pin Voltage of TW Pin Voltage of RESETB Pin Voltage of SCK Pin Voltage of INH Pin Voltage of SENSE Pin Current of RESETB Pin Operating Temperature Range Storage Temperature Range ELECTRICAL CHARACTERISTICS R5108GxxxA/C Symbol VIN Iss Unless otherwise specified, VIN=6.0V, CTW =0.1uF, CD=0.1uF, Rpull-up=100kΩ,Topt=25°C Item Operating Voltage Supply Current VIN=(-VDET)+0.5V Clock Pulse Input Voltage Detector SENSE pin Threshold -40°C≤Topt≤105°C x0.990 x0.972 ±100 (-VDET) (-VDET) (-VDET)x x0.03 0.07 x0.05 340 467 370 0.6 0.38 0.65 0.80 0.90 0.9 Conditions Min. 1.5 11 Typ. Max. 6.0 15 Unit V µA The number of Bold font applied to the temperature range from -40°C to 105°C -VDET ∆-VDET/ ∆Topt VHYS tpLH VINL IDOUTN IDOUTP Detector Threshold Detector Threshold Temperature Coefficient Detector Threshold Hysteresis Output Delay Time Minimum Operating Voltage Output Current (RESETB Output pin) Output Current (RESETB Output pin) Watchdog Timeout period Reset Hold Time of WDT SCK Input "H" SCK Input "L" INH Input "H" x1.010 x1.015 V ppm/ °C V ms V mA mA CD=0.1µF RESETB≤0.1V, pull-up=100kΩ Nch, VDD=1.2V, VDS=0.1V Nch, VDD=6.0V, VDS=0.5V(R5108GxxxC) Watchdog Timer CTW =0.1uF CTW =0.1uF TWD TWR VSCKH VSCKL VINHH 230 29 VINx0.8 0.0 1.0 310 34 450 48 6.0 VINx0.2 6.0 ms ms V V V 4 R5108G Symbol VINHL RINH TSCKW Item INH Input "L" INH pull-up Resistance SCK Input Pulse Width VSCKL=VINx0.2, VSCKH=VINx0.8 Conditions Min. 0.00 60 500 110 Typ. Max. 0.35 164 Unit V kΩ ns *Bold Type is guaranteed by design. TYPICAL APPLICATIONS Power supply R VDD RESETB VDD RESET SENSE R5108GxxxA SCK INH C SW CCD D µP I/O Series GND TW CTW Power supply VDD RESETB VDD RESET SENSE R5108GxxxC INH CD CCD µP SCK TW CTW Series I/O SW GND TEST CIRCUIT R(R5108GxxxA) A V DD RESETB SCK Clock Input R5108GxxxA/C SENSE INH CD CD Series GND TW C C TW Supply Current Test Circuit 5 R5108G TIMING DIAGRAM (R5108GxxxA/R5108GxxxC) (Nch open-drain, RESETB pin is pulled up to VDD.) VDD Ｉ NＨ SENSE +VDET -VDET CD tpLH VTCD TWD VrefH TW VrefL TWDI tpHL SCK TWR tpLH RESETB (1) (2) (4) (3) (5) (6) 6 R5108G OPERATION M W hen the SENSE 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. N W hen the SCK pulse is input, the watchdog timer is cleared, and TW pin mode changes from discharge mode to charge mode. When the TW pin voltage becomes higher than VREFH, the mode will change into discharge, and next watchdog time count starts. O Unless the SCK pulse is input, WDT will not be cleared, and during the charging period of TW pin, RESETB="L". P W hen the SENSE pin becomes lower than the detector threshold voltage, RESETB outputs "L". Q If "L" signal is input to the INH pin, the RESETB outputs "H", regardless the SCK clock state. R W hen the signal to the INH pin is set from "L" to "H", the watchdog starts supervising the system clock. ∗ Watchdog Timeout period/Reset hold time The watchdog timeout period and reset hold time can be set with an external capacitor to 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. tWD(s) = 3.1*10 × C (F) 6 tWR(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". After starting the watchdog timeout period, (just after from the discharge of the external capacitor) even if the clock pulse is input during the time period "TWDI", the clock pulse 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 CD pin. The next equation describes the relation between the capacitance value and the released delay time (tpLH). tpLH(s)=3.7×106× C(F) Note that the temperature dependence graph in the typical characteristics does not contain the temperature characteristics of the external capacitor. Minimum Operating Voltage (VINL) We specified the minimum operating voltage 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. Inhibit (INH) Function If INH pin is set at "L", the watchdog timer stops monitoring the clock, and the RESETB output will be dominant by the voltage detector's operation. Therefore, if the SENSE pin voltage is set at more than the detector threshold level, RESETB outputs "H" regardless the clock pulse. INH pin is pulled up with a resistor (TYP. 110kΩ) internally. 7 R5108G SENSE Function Built-in Voltage detector monitors the input voltage for SENSE pin. To obtain the normal detector threshold, Vin≥1.5V must be secured. 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. Power on Reset Operation against the input gtlitch +V DET -V DET 0V ) (tpLH1 < tpLH VDD Perfect Discharge CD +VTCD -V TCD 0V Imperfect Discharge RESETB 0V tpLH1 tpLH APPLICATION NOTES If a resistor is connected to the VDD pin, the operation might be unstable with the supply current of IC itself. VDD R1 VIN R2 VDD R1 VIN VDD R1 VIN R5108 CMOS RESETB Output R2 R5108 RESETB R5108 RESETB Connection examples affected by the conduction current 8 R5108G TYPICAL CHARACTERISTICS 1) Supply Current vs. Input Voltage R510xN15 1A/C, R51 0xG 1 51A/C 20 18 16 14 12 10 8 6 4 2 0 0 20 18 16 14 12 10 8 6 4 2 0 0 R510xN301A/C, R510xG301A/A CURRENT Iss [uA] CURRENT Iss [uA] 105℃ 25℃ -50 ℃ 105℃ 25℃ -50℃ 1 2 3 4 SUPPLY VOLT AGE [V] 5 6 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 2) Detector Threshold vs. Temperature R510xN151A/C, R510xG151A/C 1.530 2.740 DETECT VOLTAGE [V] 2.730 2.720 2.710 2.700 2.690 2.680 2.670 2.660 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 R510xN271A/C, R510xG271A/C DETECT VOLTAGE [V] 1.520 1.510 1.500 1.490 1.480 1.470 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 R510xN421A/C R510xG421A/C 4.280 DETECT VOLTAGE [V] 4.260 4.240 4.220 4.200 4.180 4.160 4.140 4.120 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 9 R5108G 3) Detector Threshold Hysteresis vs. Temperature R510xN151A/C R510xG151A/C 7.0 7.0 R510xN271A/C R510xG271A/C HYSTERESIS [%] 5.0 HYSTERESIS [%] -25 0 25 50 75 TEMPERATURE [℃] 100 125 6.0 6.0 5.0 4.0 4.0 3.0 -50 3.0 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 R510xN421A/C R510xG421A/C 7.000 HYSTERESIS [%] 6.000 5.000 4.000 3.000 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 4) Detector Threshold vs. Input Voltage 1.53 1.52 DETECT VOLTAGE [V] 1.51 1.5 1.49 1.48 1.47 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE VDD [V] 5.5 6.0 R5108G151A/C Topt=25℃ 10 R5108G 5) Nch Driver Output Current vs. VDS Topt=25°C 20 18 OUTPUT CURRENT　[mA] R510xN, R510xG VDD=6.0V VDD=5.0V VDD=3.0V VDD=2.0V VDD=4.0V 16 14 12 10 8 6 4 2 0 0.0 VDD=1.5V VDD=1.0V 0.2 0.4 0.6 0.8 VDS [V] 1.0 1.2 1.4 6) Nch Driver Output Current vs. VDD 20 18 OUTPUT CURRENT [mA] R510xN, R510xG 20 18 R510xN, R510xG OUTPUT CURRENT [mA] 16 14 12 10 8 6 4 2 0 0 1 2 3 4 SUPPLY VOLTAGE VDD [V] Vds=0.3V Topt=-40℃ 25℃ 16 14 12 10 8 6 4 2 0 0 1 Topt=-40℃ Vds=0.5V 25℃ 105℃ 105℃ 5 6 2 3 4 5 SUPPLY VOLTAGE VDD [V] 6 7) Pch Driver Output Current vs. VDD 2.0 1.8 OUTPUT CURRENT [mA] R510xN, R510xG VDS=0.3V 2.0 1.8 OUTPUT CURRENT [mA] R510xN, R510xG VDS=0.5V 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 1 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -40℃ -40℃ 25℃ 105℃ 25℃ 105℃ 2 3 4 SUPPLY VOLTAGE [V] 5 6 0 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 11 R5108G 2.0 1.8 OUTPUT CURRENT [mA] 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 105℃ R510xN, R510xG VDS=1.0V -40℃ 25℃ 8) Released Delay Time vs. Input Voltage 500 480 460 440 420 400 380 360 340 320 300 0 1 9) Released Delay Time vs. Temperature R 510x N, R 510xG 500 480 460 440 420 400 380 360 340 320 300 -50 -25 R510xN, R510xG POWER ON RESET DELAY tpLH[ms] Topt=25℃ POWER ON RESET DELAY tpLH [ms] VDD=6V 2 3 4 5 SUPPLY VOLTAGE [V] 6 7 0 25 50 75 100 125 150 TEMPER A TURE [℃] 10) Detector Output Delay Time vs. Temperature R510xN, R510xG 11) WDT Reset Timer vs. Temperature R510xN, R510xG 50 48 46 100 90 80 70 TIME [usec] 1us (-VDET)+1 RESET TIME [msec] 60 50 40 30 20 10 0 -50 -25 INPUT 44 42 40 38 36 34 32 (-VDET)-1 0 25 50 75 TEMPERATURE [℃] 100 125 30 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 12 R5108G 12) WDT Timeout Period vs. Temperature 400 380 360 Timeout Period [msec] 13) WDT Reset Timer vs. Input Voltage R510xN, R510xG 50 48 46 RESET TIME [msec] R510xN, R510xG 340 320 300 280 260 240 220 200 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 44 42 40 38 36 34 32 30 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 14) WDT Timeout Period vs. Input Voltage 400 380 Timeout Period [msec] 360 340 320 300 280 260 240 220 200 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 R510xN, R510xG 13