To all our customers Regarding the change of names mentioned in the document, such as Mitsubishi Electric and Mitsubishi XX, to Renesas Technology Corp. The semiconductor operations of Hitachi and Mitsubishi Electric were transferred to Renesas Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.) Accordingly, although Mitsubishi Electric, Mitsubishi Electric Corporation, Mitsubishi Semiconductors, and other Mitsubishi brand names are mentioned in the document, these names have in fact all been changed to Renesas Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been made to the contents of the document, and these changes do not constitute any alteration to the contents of the document itself. Note : Mitsubishi Electric will continue the business operations of high frequency & optical devices and power devices. Renesas Technology Corp. Customer Support Dept. April 1, 2003 2tENESAS Renesas Technology Corp.MITSUBISHI<Dig./Ana.INTERFACE> M62055FP 3V POWER SUPPLY with WATCHDOG TIMER GENERAL DESCRIPTION M62055FP is a 3V power supply featuring a watchdog timer function for a microcontroller system. PIN CONFIGURATION(TOP VIEW) It can be a power source of 3V + 5% by utilizing the reference voltage and amplifier. It can also generate a reset pulse for the applied systems during power-on, moreover it includes the GND OQ = |__| vee watchdog timer for a self diagnostics of the system, a CLM which can prevent system erroneous functions. WD BS | TC oF |_|] Yoo FEATURES 7 Power-on reset RESET a |__| oe Watchdock timer * High accuracy voltage source of 3V +5% (max) Overcurrent protection circuit Outline sP2S * The voltage detection accuracy of +5% (max) * Output power (Vo) cutoff function at erroneous conditions Backward voltage protection circuits for inputs and outputs APPLICATION Handy information terminal equipment, CD-ROM, Portable audio equipment. BLOCK DIAGRAM VS cre o Nete @ ; It indicates Vo, O , O unlass otherwise noted Voo Voo t The input and ut 1 utp conservation circuit VOLTAGE DETECTOR (CURRENT LIMITER) CIRCUIT -_ HE Veo Set priority Reset pnonty Fy priority Abd || ie RISE DELAY (300psec) > = as Reset Reset io Vet prority | 1.Bv = | <b} IrPin Functional description MITSUBISHI<Dig./Ana.INTERFACE> M62055FP 3V POWER SUPPLY with WATCHDOG TIMER pin number symbol Functional description 1 GND Ground 2 WD Input for watchdock timer. 3 T Setting up reset timer and watchdock timer. 4 RESET Reset signal output 5 vO Feedback toa power supply fora MCU. 6 VD Controlling the stability of an output voltage with a PNP transistor connected externally. 7 CLM Current limiting 8 Vcc Power supply voltage ABSOLUTE MAXIMUM RATINGS (Ta=25C, Unless otherwise noted) symbol Parameter conditions Ratings Unit Vcc |supply voltage 13 V VRM . Output voltage 10 y IRM Reset Pin Output current 10 mA VYwom |Watchdock pin input voltage 3 Vv Ke | Thermal derating Ta 2 25C 4.0 mWicc Topr | Operating temperature -20 ~ +75 C Tstg Storage temperature -55 ~ +150 C 970508 2tENESAS (276)ELECTRICAL CHARACTERISTICS MITSUBISHI<Dig./Ana.INTERFACE> M62055FP 3V POWER SUPPLY with WATCHDOG TIMER (ec=5.0V,Ta=25C, Unless otherwise noted) (1) DC CHARACTERISTICS symbol Parameter Test conditions a Unit - Min Typ | __ Max Battery* back up* regulator Vec supply voltage 3.5 13 Vv lec Circuitry current 650 950 pA Vo Output voltage 2.85 3.0 3.15 V pmax | Bias current 10 mA lesc Listing short circuit bias current 15 mA Reg-in | Input voltage regulation | oco=3.5V~13V 0.02 0.25 ly Reg-lo | Loading voltage regulation | lo=10mA~100MA 1 25 mv AVOfAT | Output voltage thermal coefficient 0.02 IT VtHcim | CLM threshold voltage 180 200 220 mv Reset, watch dock timer VTHI(H) 2.68 2.82 2.96 Vv ViHi(y) | Vo detection voltage 2.58 2.72 2.86 Vv AVTHi 0.1 Vv VoLrst)| Output voltage | Reset |lsink=4mA 0.2 0.4 Vv lleak Output kakage curent | PIN 5 pA VtH2(H) | Watchdock timer 2.28 2.4 2.52 v Vina) | threshold voltage 0.95 1.0 1.05 Vv lwo WD input current VIN=3V 1 pA ViH(wb) | WD input threshold voltage 1.5 Vv lkeo TC output current VIN=0.8V 1 pA bet TC input current VIN=2.4V 2.0 ma lio In the output cutoff transmission mode 8.0 mA Vecomin | Veo min operating voltage | *1 20 v Note *1; The Vcc minimum operating voltage at which the RESET output is Low (2) AC CHARACTERISTICS = (Vec=5.0V,Ta=25C, Unless otherwise noted) . Limits : symbol Parameter Test conditions Min Typ Max Unit two Watch dock timer C=0.1pF,R1=10KQ 0.5 1.2 17 ms tret(1) | Reset timer (1) C=0.1pF,R1=10KQ 07 ms trst2) | Reset timer (2) CO=10pF, R1=10KQ, IL=0 0.1 2.0 ms 970508 stENESAS (3/6)MITSUBISHI<Dig./Ana.INTERFACE> M62055FP 3V POWER SUPPLY with WATCHDOG TIMER FUNCTIONAL DESCRIPTION Tick deactivation output cutoff output cutotf WTHAH) Vo 0 re I VoHtiL x \} \ v 1 ! it s.9 <O.9 TAD! (1) : When Vo rises to 0.5 V, RESET becomes low. Then, charging to a capacitor C connected to TC will be started at the Vo of 2.82 V(VTH1(H)). (2) : When Vcc rises to 3V+VCE(sat), Vo becomes stable. (314): When TC voltage rises to 1V(VTH2{L)) , RESET becomes high. When it rises to 2.4 (VTH2(H)) further, the capacitor C is switched to discharge and RESET becomes low. : At the same time of a change-over to the discharge from the capacitor C, Vo is intercepted. Then,TC will be discharged completely at Vo of 2.72V(VTHi (L)). : Yo returns to 3V right after it has fallen down to 0.9 V. RESET repeats above operation tilla normal clock signal is input to WD pin. dod: (2d3): (4 : In the case of a sudden power interruption, Yo falls down according to a decrease of Vcc. When it falls down to 2.72, the capacitor Cis discharged and RESET will be low. In the case of a reversion from the power interruption, Vo rises according to a increase of Voc. When it rises to 2.82V, the charging to the capacitor Cis started and RESET will be high right after TC voltage reaches 1V. In the case a clock signal for discharging the capacitor Cis applied to pin WD before TC voltage reaches to 2.4V, a reset signal to RESET is canceled. In the case an abnormal clock signal is input, TC repeats charging / discharging alternately between 1 V and 2.4 V, so that RESET also repeats high / low till a normal clock signal is input. : When Vo falls down to 2.72 , RESET becomes Low. 970508 stENESAS (4/6)MITSUBISHI<Dig./Ana.INTERFACE> M62055FP 3V POWER SUPPLY with WATCHDOG TIMER DESCRIPTION of TERMS 2. Pin(2) (WD pin) Input frequency, trst) Time from when TC begins to charge input pulse width, charge/discharge until it reaches to VTH2(L). time . two Time from when TC is VTH2(L) until it When input of@) WD is normal, TC waveform (3) reaches to VTH2(H). is as shown below. trst) Time from when TC is VTH2(H) until TC starts charging. VtHau) = 2.4v 1. Pin@)(TC pin) Charging and discharging ping LAVAK time . VIHAL) = 1.0 When an error is occurred in WD input, TC waveform is as shown below. Ly Ping LL output cutoff Moun Vrawy ADIN Vo 0 ; 1" t s0.9 ti=CeRie In ViTHaiHi 3X | 1 Ri TO VrHety i i} x ( 7000 + 1) -3 qi | trst(1) fasta) 7 = lodgtenh ln Ri 9 Inside delay time | ie : me i 1000 i ne VO=3.0V Conditions of an input to pin@) (WD pin) 4 Ri (1) Input period should be two or less. tRsT(1) = 0.406*C Ri + 300ps ( Pin discharge is completed before the arrival of VTH2(H) =2.4V) two =1.2C Ri 1 <{ (Charging time) c 1.2C*Ri 1 : Inside delay time (Typical values) | (2) Input pulse width twoin should be t or less. The following formula can be obtained because tRST(2)is equal to the duration of Vo cutoff. "3 3 trst(2) =C eRein (ga) Al _ Cc + 300ps *2 =40C + 300ps cutoff Tr *2: Inside delay time (Typical values) *3: A = Internal resistance 970508 2CENESAS (5/6)3V MITSUBISHI<Dig./Ana.INTERFACE> M62055FP POWER SUPPLY with WATCHDOG TIMER 3. Relationship between the input pulse width and the low pass filter i Ve " i 3.0Y___ Fez sti Kk VIN | I 0.0V.. C (External Element) Addition of a low pass filter makes input waveform dull. An input pulse width and CR of a low pass filter is determined referring to the right figure. t3=-C+ReIn eer in VIN RESET is output in the case of t 4> two. APPLICATION IN WD 1.5 3.0v 2.4 + If t3 is too long, the TC waveform changes as shown in the diagram above. t3 is setas follows; twoin ( ps) or more and tz (charging time) or less. (t2 is a discharge time while an input is normal) Woo f + 10pF cin Tl tL 10pF Woo CLM 4 M2055FP WD Vb Wo RESET Rts LA Lex ar RRST CLOCK MOUMPU RESET VDb Note : hre of the external PNP transistor, 100 to 300 is recommended. 970508 stENESAS (6/6)