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| MITSUMI System Reset (with built-in watchdog timer) MM1035 System Reset (with built-in watchdog timer) Monolithic IC MM1035 Outline This IC functions in a variety of CPU systems and other logic systems to generate a reset signal and reset the system accurately during momentary interruption or lowering of power supply voltage. It also has a built-in watchdog timer for operation diagnosis. This prevents the system from running wild by generating an intermittent reset pulse during system mis-operation. Features 1. 2. 3. 4. 5. 6. Built-in watchdog timer Low minimum operating voltage VCC=0.8V typ. Both positive and negative logic reset output can be extracted Accurate detection of drop in power supply voltage Detection voltage has hysteresis Few external parts 1 capacitor Package DIP-8A (MM1035XD) SOP-8A (MM1035XF) Applications Microcomputers Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage (Ta=25C) Symbol TSTG TOPR VCC max. VVS & VCK VOH Pd Rating -40~+125 -20~+70 -0.3~+10 -0.3~+10 -0.3~+10 400 Units C C V V V mW Voltage applied to VS & CK pins Voltage applied to RESET, RESET pin Allowable loss MITSUMI System Reset (with built-in watchdog timer) MM1035 Electrical Characteristics 1 (DC) Item Consumption current Detection voltage Detection voltage temperature coefficient Hysteresis voltage CK input threshold CK input current Symbol ICC VSL VSH VS/ T VHYS VTH IIH IIL VOH1 VOH2 VOL1 Output voltage (Low) VOL2 VOL3 VOL4 Output sink current IOL1 IOL2 ICT1 CT charge current ICT2 Minimum operating power supply voltage to ensure RESET Minimum operating power --------------------------------------------------------------------------------------------- (Except where noted otherwise, Ta=25C, VCC=5V, measurement circuit 1) Measurement circuit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Measurement conditions During watchdog timer operation VS=OPEN, VCC VS=OPEN, VCC Min. Typ. Max. 0.7 4.05 4.15 4.20 4.30 0.01 1.0 4.35 4.45 Units mA V %/C VSH-VSL, VCC VCK=5V VCK=0V I RESET =-5A, VS=OPEN IRESET=-5A, VS=0V I RESET =3mA, VS=0V I RESET =10mA, VS=0V IRESET=0.5mA, VS=OPEN IRESET=1mA, VS=OPEN V RESET =1.0V, VS=0V VRESET=1.0V, VS=OPEN VTC = 1.0V during watchdog timer operation VTV = 1.0V during power on reset operation V RESET =0.4V I RESET =0.2mA ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 50 0.8 -20 4.5 4.5 100 1.2 0 -10 4.8 4.8 0.2 0.3 0.2 0.3 150 2 1 -3 mV V A V Output voltage (High) 0.4 0.5 0.4 0.5 mA -24 -2.4 1.0 1.0 A A V V V 10 1 -8 -0.8 16 2 -12 -1.2 0.8 0.8 VCCL1 VCCL2 IRESET=VCC-0.1V RL2 (between Pin 2 and GND) =1M supply voltage to ensure RESET MITSUMI System Reset (with built-in watchdog timer) MM1035 Electrical Characteristics 2 (AC) Item Symbol TPI TCKW TCK TWD TWR TPR TPD1 TPD2 tR1 tR2 (Except where noted otherwise, Ta=25C, VCC=5V, measurement circuit 2) Measurement circuit 2 2 2 2 2 2 2 2 2 2 Measurement conditions VCC CK 5V 4V or Min. Typ. Max. Units 8 3 20 S S S 10 2 100 2 3 1.0 1.0 15 3 150 10 S 10 1.5 1.5 S S mS mS mS VCC input pulse width CK input pulse width CK input cycle Watchdog timer monitoring time 1 CT=0.1F CT=0.1F 5 1 50 * Reset time for watchdog timer 2 * Reset hold time for power supply rise 3 * CT=0.1F, VCC RESET pin RL1=2.2k, CL1=100pF RESET pin RL2=10k, CL2=20pF RESET pin RL1=2.2k, CL1=100pF RESET pin RL2=10k, CL2=20pF ------------------------------------------------------------------------------ Output delay time from VCC * 4 Output rise time *5 * * * * * * Notes : 1: Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse, until reset pulse output. In other words, reset output is output if a clock pulse is not input during this time. 2: Reset time means reset pulse width. However, this does not apply to power on reset. 3: Reset hold time is the time from when VCC exceeds detection voltage (VSH) during power on reset, until -------------------------------------RESET output goes high (reset release). 4: Output delay time is the time from when power supply voltage drops below detection voltage (VSL), until -------------------------------------RESET output goes low (reset status). 5: Voltage range when measuring output rise and fall is 10~90%. 6: Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during power supply rise can be changed by varying CT capacitance. The times are expressed by the following formulae. The recommended range for CT is 0.001~10F. . TPR (mS) = 1000 CT (F) . TWD (mS) . . 100 CT (F) = . TWR (mS) = 20 CT (F) . Example : When CT=0.1F TPR . . 100mS = . TWD = 10mS . . 2mS TWR = . MITSUMI System Reset (with built-in watchdog timer) MM1035 Block Diagram Note 1: CP = 0.1F approx. ~ Note 2: C -1000pF. Note 3: The watchdog timer can be stopped by connecting the RCT pin to GND. (Then it functions as a voltage detection circuit.) Timing Chart VCC VSH VSL CK CT TCK RESET TPR TWD TWR RESET Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 8 TC RESET CK GND VCC RCT VS RESET ----------------------------------------- MITSUMI System Reset (with built-in watchdog timer) MM1035 Pin Description Pin No. 1 2 3 4 5 6 Pin Name TC RESET CK GND VCC RCT VS --------------------------------------------------------------- Function TWD, TWR, TPR variable pins. (TWD, TWR and TPR times are determined by the external capacitor.) Reset output pin (High output) Clock input pin (inputs clock from logic system) Reset output pin (High output) 4.2V detection voltage Watchdog timer stop pin Operation modes: Operation Variation modes : Lower OPEN, Stop connect to GND pull down Detection voltage variable pin pull up resistance, Raise Reset output pin (Low output) 7 8 RESET Measuring Circuit Measuring Circuit 1 (DC) Measuring Circuit 2 (AC) MITSUMI System Reset (with built-in watchdog timer) MM1035 Measuring Circuit 1 Item Consumption current Detection voltage CK input threshold CK input current Output voltage (High) SW Table 6-1-2. SW&Power Supply Table 1 VCK 5V VCT 0V 3V 3V 1V 0V 0V 3V 3V 3V 3V 3V 3V 3V 3V 1V 1V 0V 0V I RESET ---------------------------------------- Symbol SW1 SW2 SW3 SW4 SW5 SW6 SW7 VCC ICC VSL VSH VTH IIH IIL VOH1 VOH2 VOL1 VOL2 VOL3 VOL4 IOL1 OFF OFF OFF ON OFF OFF ON OFF OFF ON ON ON B B B B B B B C B B C C B B B B B A B B B B B B B B B B B B C A B B B B ON 5V IRESET VM, IM Notes -5A 0.5mA 1mA ICC VO1, CRT1 VO1, CRT1 ICK ICK ICK VO1 VO2 VO1 VO1 VO2 VO2 IO1 IO2 ITC ITC VO1, VCC VO2, VCC VOO=1V VOO=1V -5A 3mA 10mA - ON 5V 0V 3V ON 4V 5V 3V ON ON ON ON ON ON ON ON ON ON ON OFF OFF 5V 0V 3V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 0V 5V 5V 5V 5V 5V 5V 5V 5V - OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF ON ON OFF ON OFF ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON Output voltage (Low) OFF OFF ON OFF OFF ON OFF ON ON OFF OFF ON OFF OFF ON ON OFF ON OFF ON ON Output sink current CT charge current 1 CT charge current 2 Minimum operating power supply voltage to ensure reset Minimum operating power supply voltage to ensure reset IOL2 ITC1 ITC2 VCCL1 VCCL2 OFF OFF OFF ON ON 0V 2V 0V ON 0V 2V 0V Measuring Circuit 2 Item VCC input pulse width SW Table 6-2-2. SW&Power Supply Table 2 VCCA 5V T1 4V VCC 5V 5V 5V 5V 5V 5V 0V 5V 0V 5V 5V 5V 5V 1.4V 0V 1.4V 0V 1.4V 0V T2 or T2 T2 T3 5V 5V 5V 0V 0V 5V 5V 5V 5V CRT1,2,3 T2=3S VCKA T2 T3 VCK CRT CRT1,2,3 Notes T1=8S Symbol SW1 SW2 TPI C A A A A A C C A A A A B B B A A A A A A A A A CK input pulse width TCKW CK input cycle Watchdog timer monitoring time Reset time for watchdog timer Reset hold time for power supply rise Output delay time from VCC TCK TWD TWR TPR B TPD1 TPD2 TR1 TR2 TP1 TP2 CRT1,2,3 T3=20S CRT1,2,3 CRT1,2,3 CRT1,2,3 CRT1,3 CRT2,3 CRT1 CRT2 CRT1 CRT2 Output rise time Output fall time MITSUMI System Reset (with built-in watchdog timer) MM1035 Detection Voltage Variation 1 (lowering detection voltage) Detection voltage can be changed by connecting resistor R1 externally to MM1035 Vs pin. Determine R1 according to graph 1 when changing Vs. Graph 1. Detection voltage change using MM1035 external resistor VSH value 4.0 VSL value 3.5 Detection voltage (Vs) (V) 3.0 100 200 300 400 500 600 Vs pin external resistance (R1) (k) Detection Voltage Variation 2 (raising detection voltage) Detection voltage can be changed by connecting resistor R2 externally to MM1035 Vs pin. Determine R2 according to graph 2 when changing Vs. Graph 2. Detection voltage change using MM1035 external resistor 5.0 Detection voltage (Vs) (V) VSH value 4.5 VSL value 100 200 300 400 500 600 Vs pin external resistance (R1) (k) MITSUMI System Reset (with built-in watchdog timer) MM1035 Characteristics Power supply current-Power supply voltage Power supply current Icc (mA) Output voltage-Power supply voltage (RESET pin) 7.0 Power supply current Icc (mA) PULL UP resistance 10k 1.4 1.2 1.0 0.8 0.6 0.4 0.2 6.0 5.0 4.0 3.0 2.0 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Power supply voltage VCC (V) Ta=20C.25C.75C Clock pulse input time 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Power supply voltage VCC (V) Output voltage-Power supply voltage (RESET pin) PULL UP resistance 2.2k ------------------------------------------------------------------ Detection voltage (VSL, VSH) temperature (RESET, RESET pins) 4.50 Detection voltage (V) -------------------------------------------------------------------------- 7.0 Output voltage VRESET (V) 6.0 5.0 4.0 3.0 2.0 1.0 Ta=-25C Ta=25C Ta=75C 4.40 4.30 4.20 4.10 4.00 3.00 -40 -20 0 VSH VSL 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Power supply voltage VCC (V) 20 40 60 80 100 Ambient temperature Ta (C) Output saturation voltage-Output sink current (RESET pin) Output saturation voltage VOL (mV) --------------------------------------------------------------- Output saturation voltage-Output sink current (RESET pin) Output saturation voltage VOL (mV) Ta=25C ----------------------------------------------------------------------------- 500 400 300 200 100 Ta=-25C Ta=25C Ta=75C 500 400 300 200 100 2 4 Ta=-25C Ta=75C 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Output sink current IOL (mA) 6 8 10 12 14 16 18 Output sink current IOL (mA) MITSUMI System Reset (with built-in watchdog timer) MM1035 High level output voltage-High level output current (RESET pin) High level output voltage VOM (V) High level output voltage - High level output current (RESET pin) ------------------------------------------------ High level output voltage VOM (V) 5.0 4.8 4.6 4.4 4.2 4.0 3.8 -2 -4 -6 -8 -10-12-14-16-18 High level output current IOM (A) 5.0 4.8 4.6 4.4 4.2 4.0 3.8 -2 -4 -6 -8 -10-12-14 -16-18 High level output current IOM (A) Reset hold time temperature during power supply rise VCC=5V (Cr=0.1F) Watchdog timer monitoring time temperature VCC=5V (Cr=0.1F) Reset hold time temperature during power supply rise TPR (mS) Watchdog timer monitoring time temperature TWD (mS) 160 140 120 100 80 60 40 -40 -20 0 20 40 60 80 100 16 14 12 10 8 6 4 -40 -20 0 20 40 60 80 100 Ambient temperature Ta (C) Ambient temperature Ta (C) Reset time temperature (for watchdog timer) VCC=5V (Cr=0.1F) CT value for reset hold time during power supply rise 3.5 Reset time TWR (mS) 3.0 2.5 2.0 1.5 1.0 0.5 -40 -20 0 20 40 60 80 100 Hold time TWD (mS) Ambient temperature Ta (C) 105 104 103 102 101 100 10-3 10-2 10-1 100 101 CT capacitance (F) MITSUMI System Reset (with built-in watchdog timer) MM1035 CT value for reset time (for watchdog timer) CT value for watchdog timer monitoring time Timer monitoring time TWD (mS) 103 Reset time TWR (mS) 104 103 102 101 100 10-1 10-3 10-2 10-1 100 101 CT capacitance (F) 102 101 100 10-1 10-2 10-3 10-2 10-1 100 101 CT capacitance (F) |
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