R5105N

Microprocessor Supervisory Circuit R5105N SERIES OUTLINE NO. EA-159-070908 The R5105N Series are CMOS-based µ con supervisory circuit, or 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 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 supply 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. The package is small SOT-23-6. 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 ············································ 0.9V 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 ················································· SOT-23-6 APPLICATION • Supervisory circuit for equipment with using microprocessors. 1 R5105N BLOCK DIAGRAMS R5105Nxx1A VDD + CD - - + GND WATCHDOG TIMER CLOCK DETECTOR TW SCK RESETB R5105Nxx1C VDD CD + - + GND WATCHDOG TIMER CLOCK DETECTOR TW SCK RESETB 2 R5105N SELECTION GUIDE The selection can be made with designating the part number as shown below: R5105Nxx1x-TR ←part Number ↑ ↑↑ ↑ a bcd Code a b c d Descriptions Designation of Package Type; N: SOT-23-6 (2.8mmx2.9mm) 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 output C: CMOS output Designation of Taping Type PIN CONFIGURATION SCK 1 R5105NxxxA 6 CD TW 2 R5105NxxxC 5 GND VDD 3 4 RESETB SOT 23-6 PIN DESCRIPTION Pin No 1 2 3 4 5 6 Symbol SCK TW VDD RESETB GND CD Pin Description Clock Input Pin from Microprocessor External Capacitor Pin for setting Reset and Watchdog Timer Timeout Period Power supply Pin Output Pin for Reset signal of Watchdog timer and Voltage Detector. (Output “L” at detecting Detector Threshold and Watchdog Timer Reset.) Ground Pin External Capacitor Pin for Setting delay time of Voltage Detector 3 R5105N ABSOLUTE MAXIMUM RATINGS Topt=25°C, VSS=0V Symbol VIN VCT VTW VRESETB VSCK IRESETB PD Topt Tstg Input Voltage Output Current Power Dissipation 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 20 250 -40∼+105 -55∼+125 Unit 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 Current of RESETB Pin Operating Temperature Range Storage Temperature Range 4 R5105N ELECTRICAL CHARACTERISTICS R5105NxxxA/C Symbol VIN Iss Unless otherwise specified, VIN=6.0V, CT=0.1uF, Rpull-up=100kΩ Item Operating Voltage Supply Current VIN=(-VDET)+0.5V Clock pulse input Voltage Detector VIN pin Threshold -40°C≤Topt≤105°C Conditions Min. 0.9 11 Typ. Topt=25°C The number written in bold font is applied to the temperature range from -40°C to 105°C Max. 6.0 15 x1.010 x1.015 Unit V µA -VDET ∆-VDET/ ∆Topt VHYS tpLH IDOUTN IDOUTP Detector Threshold Detector Threshold Temperature Coefficient Detector Threshold Hysteresis Output Delay Time Output Current (RESETB Output pin) Output Current (RESETB Output pin) Watchdog Timeout period Reset Hold Time of WDT SCK Input "H" SCK Input "L" SCK Input Pulse Width x0.990 x0.972 ±100 V ppm/ °C V ms mA mA CD=0.1µF Nch, VDD=1.2V, VDS=0.1V Pch, VDD=6.0V, VDS=0.5V (R5105NxxxC) Watchdog Timer CTW =0.1uF CTW =0.1uF (-VDET) (-VDET) (-VDET) x0.03 x0.07 x0.05 340 467 370 0.38 0.65 0.80 0.90 TWD TWR VSCKH VSCKL TSCKW 230 29 VINx0.8 0.0 310 34 450 48 6.0 VINx0.2 ms ms V V ns VSCKL=VINx0.2, VSCKH=VINx0.8 500 Bold type values are guaranteed by design. TYPICAL APPLICATIONS Power supply R VDD RESETB R5105NxxxA Power supply VDD RESET VDD RESETB R5105NxxxC VDD RESET µP SCK TW CTW I/O µP SCK TW CTW I/O Series C CD CD GND Series C CD CD GND 5 R5105N TEST CIRCUIT R(R5105NxxxA) A VDD RESETB SCK R5105NxxxA/C Series CD CCD Clock Input GND TW CTW Supply Current Test Circuit 6 R5105N TIMING DIAGRAM (R5105NxxxA/R5105NxxxC) (Nch open-drain, RESETB pin is pulled up to VDD.) VDD tpHL CD VTCD tpHL TWD VrefH TW VrefL TWDI SCK tpLH tpLH TWR (1) (2) (3) (4) (1) 7 R5105N OPERATION M W hen the power supply, VIN 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 the discharge mode to the charge mode. When the TW pin voltage becomes higher than VREFH, the mode will change into the discharge mode, 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 VIN pin becomes lower than the detector threshold voltage(-VDET), RESETB outputs "L". ∗ 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. t WD(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) When the VDD voltage becomes equal or less than (-VDET), discharge of the capacitor connected to the CD pin starts. Therefore, if the discharge is not enough and VDD voltage returns to (+VDET) or more, thereafter the delay time will be shorter than tpLH which is expected. Minimum Operating Voltage 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. 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. 8 R5105N Power on Reset Operation against the input glitch +V DET -V DET 0V ) (tpLH1 < tpLH VDD Complete Discharge CD +VTCD -V TCD 0V Incomplete 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 R5105 CMOS R2 R5105 RESETB R5105 RESETB Output RESETB Connection examples affected by the conduction current 9 R5105N TYPICAL CHARACTERISTICS 1) Supply Current vs. Input Voltage R510xN151A/C, R510xG151A/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 VOLTAGE [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 10 R5105N 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) Nch Driver Output Current vs. VDS Topt=25°C 20 18 OUTPUT CURRENT　[mA] 16 14 12 10 8 6 4 2 0 0.0 0.2 0.4 0.6 0.8 VDS [V] 1.0 1.2 1.4 VDD=1.0V VDD=1.5V R510xN, R510xG VDD=6.0V VDD=5.0V VDD=3.0V VDD=2.0V VDD=4.0V 11 R5105N 5) Nch Driver Output Current vs. VDD 20 18 OUTPUT CURRENT [mA] OUTPUT CURRENT [mA] 16 14 12 10 8 6 4 2 0 0 1 2 3 4 SUPPLY VOLTAGE VDD [V] 5 6 105℃ 25℃ Vds=0.3V Topt=-40℃ R510xN, R510xG 20 18 16 14 12 10 8 6 4 2 0 0 1 2 3 4 5 SUPPLY VOLTAGE VDD [V] 6 105℃ Topt=-40℃ Vds=0.5V 25℃ R510xN, R510xG 6) Pch Driver Output Current vs. VDD 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 -40℃ 25℃ 105℃ R510xN, R510xG OUTPUT CURRENT [mA] VDS=0.3V 2.0 1.8 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℃ -40℃ 25℃ R510xN, R510xG VDS=0.5V 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 R510xN, R510xG VDS=1.0V -40℃ 25℃ 105℃ 2 3 4 SUPPLY VOLTAGE [V] 5 6 12 R5105N 7) Released Delay Time vs. Input Voltage 500 480 460 440 420 400 380 360 340 320 300 0 1 8) Released Delay Time vs. Temperature R 510xN, 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 TUR E [℃] 9) Detector Output Delay Time vs. Temperature R510xN, R510xG 10) WDT Reset Timer vs. Temperature R510xN, R510xG 50 48 46 100 90 80 70 TIME [usec] 60 50 40 30 20 10 0 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 INPUT 1us (-VDET)+1 (-VDET)-1 RESET TIME [msec] 44 42 40 38 36 34 32 30 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 11) WDT Timeout Period vs. Temperature 400 380 360 Timeout Period [msec] 340 320 300 280 260 240 220 200 -50 -25 0 25 50 75 TEMPERATURE [℃] 100 125 R510xN, R510xG 12) WDT Reset Timer vs. Input Voltage R510xN, R510xG 50 48 46 RESET TIME [msec] 44 42 40 38 36 34 32 30 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 13 R5105N 13) WDT Timeout Period vs. Input Voltage 400 380 Timeout Period [msec] R510xN, R510xG 360 340 320 300 280 260 240 220 200 1 2 3 4 SUPPLY VOLTAGE [V] 5 6 14