MITSUBISHI<Dig./Ana.INTERFACE> M62050P,FP 3V supply SYSTEM RESET with watchdog timer FEATURES • Watchdog timer (supervisor for 2 system voltages) • Power-on reset timer • Low current consumption 0.6mA (typ) at Vcc = 3V • Wide supply voltage range Vcc = 7V (max) PIN CONFIGURATION(TOP VIEW) WD 1 TC 2 RST1 3 GND 4 8 ADJ M62050P,FP GENERAL DESCRIPTION M62050P/FP is a voltage threshold detector designed for detection of 3V supply voltage and generation of a system reset pulse. It is suitable for microcontroller systems. The IC, a supervisor of the MCU operations, dissipates low current of 0.6mA (typ) during normal operations of the MCU systems. It has 2 selectable threshold voltages, which allows applying it to a high precision system design. 7 RST2 6 Vcc 5 ct1 APPLICATION • Supervisor for microcontroller systems OUTLINE RECOMMENDED OPERATING CONDITION • Supply voltage range 2V ~ 4V 8P4(P) 8P2S-A(FP) BLOCK DIAGRAM F•F F•F W•D•T 1.24V F•F 1 WD 2 TC 3 RST1 REFERENCE VOLTAGE CIRCUIT 4 GND 5 ct1 (1/4) 6 Vcc 7 RST2 8 ADJ 1995-12-6 MITSUBISHI<Dig./Ana.INTERFACE> M62050P,FP 3V supply SYSTEM RESET with watchdog timer Terminal functional description PIN No. symbol Terminal functional description 1 W D Input for watchdog timer 2 T C Time set for reset timer and watchdog timer 3 RST1 When abnormal signaling is input into WD terminal, it generates reset signal. 4 GND GND 5 ct1 Detection voltage adjustment for WD input 6 Vcc Power supply 7 RST2 When power supply voltage became abnormal, it generates reset signal. 8 ADJ Selection between 2 detection voltages ABSOLUTE MAXIMUM RATING symbol Parameter Ratings Units 15 V -0.3 ~ 5 V VCC Power supply voltage VIN Input voltage VOUT Output voltage 15 V IOUT Output current 10 mA Pd Internal power dissipation 625 mW KO Heat reduction rate 4.40 mW/°C Topr Operating ambient temperature -20 ~ +75 °C Tstg Storage temperature -55 ~ +125 °C (2/4) MITSUBISHI<Dig./Ana.INTERFACE> M62050P,FP 3V supply SYSTEM RESET with watchdog timer ELECTRICAL CHARACTERISTIC (Ta=25 °C, VCC=3V, unless otherwise noted) (1) DC characteristics Symbol IWD VIH VIL Parameter Terminal WD input current WD WD input voltage WD Measurement condition VIN=3V IOUT TC output current TC VIN=0.9V IIN TC input current TC VOUT=2.5V VTH3(H) Watchdog timer VTH3(L) threshold voltage TC VOL Output voltage Ileak Output leakage current VCC1 ∆TH1 VTH2(H) VTH2(L) Vcc detection voltage(2) VCC2 ADJ Terminal=OPEN ADJ Terminal=Vcc ADJ Terminal=OPEN ADJ Terminal=Vcc ∆VTH2 RST1 RST1 ON voltage RST2 RST2 ON voltage RST1 VCC=1.2V,RL=3kΩ RST2 VCC=1.2V,RL=3kΩ ICC Circuit current VCC Ratings Unit TYP MAX 0.06 0.15 0.25 mA 1.5 3.00 V -0.3 0.80 V -0.10 µA RST1 IOUT=1mA RST2 VOUT=4V VTH1(H) VTH1(L) Vcc detection voltage(1) MIN 2.50 mA 2.00 V 1.00 V 0.20 0.50 V 5.00 µA 2.13 2.25 2.38 V 2.10 2.20 2.30 V 0.03 0.05 0.08 2.43 2.55 2.68 V V 2.40 2.50 2.60 V 0.03 0.05 0.08 V 0.5 0.5 V 0.5 V 1.0 mA (2) AC characteristics Symbol TWD Parameter Watchdog timer Terminal RST1 tRST(1) Reset Timer(1) RST1 tRST(2) Reset Timer(2) RST1 tWDIN td1 td2 Input pulse duration WD Propagation delay RST1 RST2 Measurement condition MIN Ratings Unit TYP MAX 1.1CR1 C=0.1µF,R1=10kΩ 0.5 1.1 0.5CR1 C=0.1µF,R1=10kΩ 0.2 0.50 R1=10kΩ C=0.1µF,R1=10kΩ ( 3/4) 830C 40 3 s 1.7 ms s 1.1 ms s 83 220 µs µs 10 5 µs µs MITSUBISHI<Dig./Ana.INTERFACE> M62050P,FP 3V supply SYSTEM RESET with watchdog timer Timing chart VTH2(L) VTH1 VTH2(H) VTH1 VCC 0V VTH3(H) TC VTH3(H) 0V VIN 0V RST1 0V RST2 0V tRST(1) tWD tRST(2) Application circuitry example 8 7 6 5 M62050 1 CLOCK 2 3 RST1 (RESET) 4 RST2 (HOLD) MCU/MPU VDD (4 /4)