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| MITSUMI System Reset (with built-in watchdog timer) MM1142 System Reset (with built-in watchdog timer) Monolithic IC MM1142 Outline This IC was developed to drive low voltage batteries, and has a watchdog timer with built-in microcomputer reset voltage detection circuit and low battery detection circuit. A single reference voltage is used for low battery voltage detection and microcomputer reset voltage . detection, so detection voltage difference is uniform ( = 0.2V). Further, there is a built-in watchdog timer for . operation diagnosis, which prevents the system from running wild by generating an intermittent reset pulse during system mis-operation. Features 1. Accurate voltage drop detection voltage 1. Low battery detection 2.2V3% 2. Power supply voltage detection 2.0V3% 3. Detection voltage error 0.2V20mV 1-2 4. Hysteresis both 50mV typ. 2. Watchdog function stop pin (can be made to function only as reset IC during VCC rise) 3. Low current consumption 150A typ. Package SOP-8C (MM1142XF) Applications 1. 2V cordless telephones 2. Portable communication equipment 3. Various types of small, handy equipment Series Table Model MM1142 TPR : TWD : TWR : VSLB: VSLR: VSLB 2.2V VSLR 2.0V TPR 100mS TWD 100mS TWR 2mS Reset hold time during Vcc rise Timer monitoring time Reset time Battery check detection voltage Reset detection voltage *CT=0.02F MITSUMI System Reset (with built-in watchdog timer) MM1142 Pin Assignment 1 8 7 6 5 2 3 4 1 2 3 4 5 6 SOP-8C 7 8 TC ---------------------------------------------- BC(RESET) CK GND VCC RCT VS ---------------------------------------------- RESET Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin name TC ----------------------------------------------------------------------------------- Function TWD, TWR, TPR time setting pins. Clock input pin GND pin Power supply voltage input pin Watchdog timer stop pin Operation modes Operation OPEN, Stop connect to GND Detection voltage fine adjustment pin Reset output pin (low output) BC(RESET) Battery check output pin (RESET low level output) for 3.4V CK GND VCC RCT VS ----------------------------------------------------------------------------------- RESET Block Diagram MITSUMI System Reset (with built-in watchdog timer) MM1142 Absolute Maximum Ratings (Ta=25C) Symbol VCC max. VIN VOUT Pd TSTG Rating -0.3~+7 -0.3~VCC+0.3 ( < +7) = < -0.3~VCC+0.3 ( = +7) 300 -40~+125 Units V V V mW C Item Power supply voltage Voltage applied to input pin Voltage applied to output pin Allowable loss Storage temperature Recommended Operating Conditions Item Power supply voltage RESET sync current BC sync current Clock input high level voltage Clock input low level voltage Clock monitoring time setting Clock rise and fall times Power supply voltage rise times Power supply voltage fall times TC pin capacitance Operating temperature Symbol VCC IOLR IOLC VCKH VCKL TWD tRCK, tFCK tRVCC tFVCC CT TOP Rating +1.9~+6.5 0~500 0~5.0 1.0< <0.2 1~10000 <100 100< 50< 0.0022~2.2 -20~+70 Units V A mA V V mS S S S F C Electrical Characteristics Item Consumption current RESET detection voltage Detection voltage temperature coefficient R Hysteresis voltage R BC detection voltage Detection voltage temperature coefficient B Hysteresis voltage B Detection voltage difference CK input threshold CK input current Output voltage RH Output voltage BH Output voltage RL Output voltage BL Output sync current R Output sync current B Output source current R CT charge current ------------------------------------------------------------------------------ (Except where noted otherwise, Ta=25C, VCC=2.6V) Symbol Measurement conditions Min. Typ. Max. Units ICC No load 200 280 A VSLR VCC : High Low, RCT : GND, VTC=OPEN 2.00 3% V VSR T 0.01 0.05 25 50 2.20 100 3% %/C mV V %/C mV V V A V V V V A mA A A V VHYSR VCC : Low High, RCT=GND, VTC=OPEN VSLB VCC : High Low, RLB=10k VSB T 0.01 0.05 25 50 100 0.175 0.200 0.225 0.4 0.6 1.2 VCK=2.6V 0 1 VCK=0.0V -15 -6 -2 IRESET=-1A 2.0 2.2 RLB=10k 2.0 2.2 IRESET=500A, VCC=1.8V 0.3 0.5 IBC=5mA, VCC=1.8V 0.3 0.5 VRESET=0.5V, VCC=1.8V 500 700 VBC=0.5V, VCC=1.8V 5 7 VRESET=2.0V 2 4 VTC=0.5V during watchdog timer operation -0.300 -0.150 -0.075 VTC=0.5V during power ON reset operation -0.300 -0.150 -0.075 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- VHYSB VSL VTH IIH IIL VOHR VOHB VOLR VOLB IOLR IOLB IOHR ICT1 ICT2 VCC : Low High, RLB=10k VSL=VSLB-VSLR Minimum operating power supply voltage VCCL to ensure RESET VRESET=0.4V, IRESET=0.05mA ----------------------------------------------------------------------------------------- 0.8 1.0 MITSUMI System Reset (with built-in watchdog timer) MM1142 Item VCC input pulse width Symbol TPI TCKW TCK TWD TWR TPR tPDR tPDB tRR tFR tRB tFB VCC CK CK Measurement conditions 2.6V 1.8V TCKW or TCK TPI Min. 20 10 50 50 1 50 Typ. Max. Units S S S CK input pulse width CK input cycle Watchdog timer monitoring time 1 CT=0.022F CT=0.022F CT=0.022F VCC : High VCC : High Low, RLR=100k, CLR=15pF Low, RLB=10k, CLB=15pF 100 2 100 10 10 10 2 10 2 150 3 150 mS mS mS S S S S S S * Watchdog timer reset time 2 * Reset hold time for power supply rise 3 ------------------------------------------------------ * RESET delay time BC delay time RESET rise time ----------------------------------------------------------------------------------------------------------- RLR=100k, CLR=15pF RLR=100k, CLR=15pF RLB=10k, CLB=15pF RLB=10k, CLB=15pF RESET fall time BC rise time BC fall time 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 (VSHR) during power ON reset until reset release (RESET output high). 4 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. Example : When CT=0.22F ~ ~ TPR (mS) - 4500 CT (F) TPR - 100mS ~ 4500 CT (F) ~ TWD (mS) TWD - 100mS ~ ~ TWR (mS) - 90 CT (F) TWR - 2mS 5 TWD can be varied by placing a resistor (1M or more)between the RCT pin and VCC. 6 The voltage range when measuring output rise and fall time is 10~90%. 7 VCC rise time should be 100S or more, and fall time should be 50S or more. * * * * ---------------------------------------------- * * * MITSUMI System Reset (with built-in watchdog timer) MM1142 Measuring Circuit Timing Chart VSHB VSLB VSHR VSLR 0.8V TCKW TCK VCC CK CT RESET TPR TWR TWD BC RCT OPEN |
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