HA16103 FPJ/FPK. Watchdog Timer. Description. Functions. Features. Ordering Information

Transcription

1 Watchdog Timer Description The HA16103FPJ/FPK monolithic voltage control is designed for microcomputer systems. In addition to voltage regulator, it includes watch dog timer function, power on reset function, and output voltage monitor function. It is suitable for battery use microcomputer systems. Functions 5 V regulated power supply Power on reset pulse generator Watch dog timer Low voltage inhibit protection Features Wide operational supply voltage range (V CC = 6 to 40 V) Various control signals are generated when microcomputer system runaway occurs. (NMI signal and signal are generated by detecting voltage level, and signal is generated by monitoring the time after NMI signal is detected) Regulated voltage, NMI detecting voltage, detecting voltage are adjustable. At low voltage and re-start, the delay time of signal is adjustable Watchdog timer filtering uses the minimum clock input pulse width and maximum cycle detection method Ordering Information Type No. HA16103FPJ HA16103FPK Package FP-20DA FP-20DA

2 Pin Arrangement NC 1 20 NC P-RUN Rf Cf RR CR GND V Oadj V OUT NC Vadj NMI V NMIadj C VCC VCONT NC (Top view) 2

3 Pin Functions No. Pin Name Description 1 NC NC pin 2 P-RUN P-RUN signal input pin for watchdog timer 3 Rf Connect resistor Rf. Frequency bandwidth of the filter circuit depends on Rf 4 Cf Connect resistor Cf. Frequency bandwidth of the filter circuit depends on Cf 5 R R Connect resistor R R. Reset-signal power-on time depends on R R 6 C R Connect resistor C R. Reset-signal power-on time depends on C R 7 GND Ground 8 Voadj 5-V reference voltage fine-tuning pin. Connect a resistor between this pin and GND. The value of output voltage is given by V OUT = { /(R1 // 2.0)} Voadj Unit for R1: kω 9 V OUT Connect the collector of an external PNP-type transistor. The pin supplies 5-V regulated voltage for internal circuit 10 NC NC pin 11 NC NC pin 12 V CONT The external PNP-type transistor s base control pin 13 V CC Supply voltage pin. Operating supply voltage range is 6.0 to 40 V. 14 C If the voltage of V OUT pin declines to less than Detection voltage(1) (because of an instant power cut or other cause), NMI signals are generated. If t 0.5 Rf C (sec) has passed since then, signals are generated. If the voltage of V OUT pin inclines to more than Detection voltage(1) (in case of re-start from LVI state), NMI signals are stop. t r 0.5 Rf C (sec) has passed since then, signals are stop. Connect capacitor C between this pin and GND to adjust the signals delay time(t, t r ). If delay time is unnecessary, make this pin open (t = 2 µs typ. t r = 10 µs typ. at open) 15 V NMIadj NMI detection voltage fine-tuning pin. Connect a resistor between this pin and V OUT pin or GND. The value of output voltage is given by V NMI = {1 + (R2 // 25.5)/(R3 // 10.6)} V NMIadj. Unit for R2, R3: kω 16 NMI NMI signal output pin. Connect to pin NMI of the microcomputer 17 signal output pin. Connect to pin of the microcomputer 18 V adj detection voltage tuning pin. Connect a resistor between this pin and V OUT or GND. The value of output voltage is given by V = 1.89 {1 + 21/( // R4)} V adj Unit for R4: kω 19 signal output pin. Connect to pin of the microcomputer 20 NC NC pin 3

4 Block Diagram V CONT V CC V OUT + V OUT V oadj kω 2 kω Error amplifier Comparator for 3.3 kω 19 Starter circuit Reference voltage generator Delay circuit Comparator for 14 Comparator for NMI 3.3 kω C 16 NMI P-RUN 2 18 V adj Band-pass filter circuit Watchdog timer Power on reset and automatic reset circuit 3.3 kω 17 R R 3 R f 4 Cf GND V NMIadj 1000 pf C R 4

5 Functional Description Stabilized Power Supply Function The stabilized power supply includes the following features: Wide range of operating input voltage from 6 V to 40 V to provide stabilized voltages Availability of any output current, by simply replacing the external transistor Fine adjustment of output voltage Figure 1 shows the fine adjustment circuit of the output circuit. Select the resistor R1 as shown in equation 1. Add a resistor between GND and Voadj to increase the output voltage. V BATT Q1 R 1 To microcomputer system C1 100 µf V CC GND VCONT V OUT HA Vout = (1+ R // 2.0 ) Voadj Equation 1 1 (R 1 : kω) (Voadj 1.31V) Figure 1 Fine Adjustment Circuit of Output Voltage 5 I OUT = 0.1 A A (Ta = 25 C) Output voltage (V) A 1 1 : Input voltage V CC (V) Figure 2 Output Voltage Characteristic 5

6 Power-On Reset Function The system contains the power-on reset function required when a microcomputer is turned on. The reset period may be set with external components R R and C R. Equation 2 specifies how to determine the reset period (ton) and figure 3 shows the characteristic of the circuit. HA16103 RR CR t on = 0.46 x C R x R Rx Vout(s) Equation 2 R R: Ω 200 m 180 m (Ta = 25 C) V CC = 12 V 160 m Power-on time ton (s) 140 m 120 m 100 m 80 m 60 m 40 m 20 m C R = 0.22 µf C R = 0.1 µf C R = µf k 200 k 500 k Resistance R R (Ω) Figure 3 Characteristic of Power-On Reset Circuit 6

7 Watchdog Timer Function The system contains a bandpass filter for pulse width detection, which outputs a reset pulse when input pulses are not at the preselected frequency (at either a higher or lower frequency). The RC characteristic of the bandpass filter may be set with external components Rf and Cf. Equation 3 specifies how to determine the minimum pulse width (tmin) for runaway detection of the bandpass filter, and figure 4 shows the characteristic of the filter. HA16103 Rf Cf tmin = Cf x Rf x 0.11 (s) Equation 3 Rf : Ω Runaway-detection minimum pulse width tmin (s) 2.0 m 1.8 m 1.6 m 1.4 m 1.2 m 1.0 m 0.8 m 0.6 m 0.4 m 0.2 m (Ta = 25 C) P Run pulse duty ratio 50% (fixed) V CC = 12 V C R = 0.1 µ F R R = 180 kω Cf = µf Cf = 0.01 µf Cf = µf 100 k 200 k 500 k Resistance Rf (Ω) Figure 4 Characteristic of Power-On Reset Circuit 7

8 Low Voltage Monitoring Function The system contains a circuit to send a control signal to the microcomputer when the output voltage drops. The circuit includes the following features. Two-point monitoring of output voltage (V NMI and V ) Availability of fine adjustment of Vth1 (V NMI ) and Vth2 (V ) Output of control signal in standby mode of microcomputer Figure 5 shows the timing chart of control signals when the output voltage drops. If the output voltage drops below Vth1 (4.60 V), the NMI signal rises to request the microcomputer to issue the NMI interrupt signal. The signal falls t seconds after the NMI signal rises. If the output voltage drops further to below Vth2 (3.2 V), the signal rises to enable the micro-computer to enter standby mode. V BATT V O 4.70 V 4.60 V 4.70 V 4.60 V 3.20 V NMI Power on reset signal ton toff t RH t RL t t r t Automatic reset signal P-RUN System runaway Figure 5 Timing Chart for Low Voltage Monitoring 8

9 Absolute Maximum Ratings (Ta = 25 C) Ratings Item Symbol HA16103FPJ HA16103FPK Units V CC supply voltage V CC V Control pin voltage V CONT V Control pin current I CONT ma V OUT pin voltage V OUT V Power dissipation P T 400* 1 400* 2 mw Operating ambient temperature range Topr 40 to to +125 C Storage temperature range Tstg 50 to to +150 C Notes: 1. Value under Ta 77 C. If Ta is greater, 8.3 mw/ C derating occurs. 2. Allowable temperature of IC junction part, Tj (max), is as shown below. Tj (max) = θj-a Pc (max)+ta (θj-a is thermal resistance value during mounting, and Pc (max) is the maximum value of IC power dissipation.) Therefore, to keep Tj (max) 125 C, wiring density and board material must be selected according to the board thermal conductivity ratio shown below. Be careful that the value of Pc (max) does not exceed that P T. Thermal resistance θj a ( C/W) SOP20 using paste containing compound SOP20 without compound (1) (2) (3) Board thermal conductivity (W/m C) (1) (2) (3) 40 mm Board 0.8 t ceramic or 1.5 t epoxy Glass epoxy board with 10% wiring density Glass epoxy board with 30% wiring density Ceramic board with 96% alumina coefficient 9

10 Electrical Characteristics (Ta = 25 C, V CC = 12 V, V OUT = 5 V) HA16103FPJ/FPK Item Symbol Min Typ Max Unit Test Condition Supply current I CCL 8 12 ma V CC = 12 V Regulator Output voltage V O V V CC = 6 to 17.5 V I OUT = 0.5 A, R 1 = 30 kω V O V V CC = 6 to 17.5 V I OUT = 1 A, R 1 = 30 kω Line regulation Voline mv V CC = 6 to 17.5 V I OUT = 1 A, R 1 = 30 kω Load regulation Voload mv I OUT = 10 ma to 0.5 A, R 1 = 30 kω Ripple rejection R REJ db Vi = 0.5 Vrms, fi = 1 khz, R 1 = 30 kω Output voltage Temperature coefficient δv O /δ T 0.6 mv/ C V CC = 12 V, R 1 = 30 kω Clock input L -input voltage V IL 0.8 V H -input voltage V IH 2.0 V L -input current I IL µa V IL = 0 V H -input current I IH ma V IH = 5 V 10

11 Electrical Characteristics (T a = 25 C, V CC = 12 V, V OUT = 5 V) (cont) HA16103 FPJ/FPK Item Symbol Min Typ Max Unit Test Condition NMI output NMI pin V OL1 0.4 V I OL1 = 2 ma L -level voltage output output NMI pin H -level voltage NMI function start V OUT voltage pin L -level voltage pin H -level voltage function start V OUT voltage pin L -level voltage pin H -level voltage function start V OUT voltage V OH1 V O1 (V O2 ) V V NMI V V OL2 0.4 V I OL2 = 2 ma V OH2 V O1 (V O2 ) V V V V OL3 0.4 V I OL3 = 2 ma V OH3 V O1 (V O2 ) V V V Power on time t ON ms Rf = 180 kω, R R = 180 kω Clock off reset time t OFF ms Cf = 0.01 µf, C R = 0.1 µf Reset pulse L -level time Reset pulse H -level time t RL ms Rf = 180 kω, R R = 180 kω Cf = 0.01 µf, C R = 0.1 µf t RH ms Rf = 180 kω, R R = 180 kω Cf = 0.01 µf, C R = 0.1 µf Low Voltage Detection voltage(1) V H V protecton Detection voltage(1) Hysteresis width V HYS mv Detection voltage(2) V H V Detection voltage(2) Hysteresis width V HYS V Reset pulse inhibit t 200 µs C = 2200 pf Delay time restart tr 200 µs C = 2200 pf 11

12 Electrical Characteristics (T a = 40 to 125 C, V CC = 12 V, V OUT = 5 V, R1 = 30 k ) (cont) HA16103FPK Item Symbol Min Typ Max Unit Test Condition Supply current I CC ma Regulator Output voltage V out V V CC = 6 to 17.5 V I OUT = 0.5 A Line regulation Voline mv V CC = 6 to 17.5 V I OUT = 0.5 A Load regulation Voload mv I OUT = 10 ma to 0.5 A Clock input L -input voltage V IL 0.4 V NMI output output output H -input voltage V IH 2.4 V L -input current I IL µa V IL = 0 V H -input current I IH ma V IH = 5 V NMI pin L -level voltage NMI pin H -level voltage pin L -level voltage pin H -level voltage pin L -level voltage pin H -level voltage V OLN 0.5 V I OL1 = 2 ma V OHN V OUT1 V V OLS 0.5 V I OL2 = 2 ma V OHS V OUT1 V V OLR 0.5 V I OL3 = 2 ma V OHR V OUT1 V Power on time t ON ms Rf = 180 kω, R R = 180 kω Clock off reset time t OFF ms Cf = 0.01 µf, C R = 0.1 µf Reset pulse L -level time Reset pulse H -level time t RL ms Rf = 180 kω, R R = 180 kω Cf = 0.01 µf, C R = 0.1 µf t RH ms Rf = 180 kω, R R = 180 kω Cf = 0.01 µf, C R = 0.1 µf Low Voltage Detection voltage(1) V NMI V protecton Detection voltage(2) V V 12

13 Test Circuit S 1 2SB857D Q1 R 1 C µ V OUT V CC GND P-RUN Rf V CONT Cf V OUT HA16103 Voadj V NMIadj NMI V adj R R C R C Counter V BATT 1000 p 180 k 0.01 µ 0.1 µ 180 k 2200 p Unit R: Ω C: F Sample Connection Circuit Sample Connection Circuit between HA16103 and H8/532 D 1 To other microcomputer systems S 1 Q1 Q2 IGN,SW V Z1 100 µ R 1 C 1 R 5 C 2 V Z2 GND P-RUN V CC V CONT V OUT V oadj V NMIadj R f HA16103 C f R R NMI V adj C C R R 4 R 2 R 3 Q3 NMI V CC PORT GND H8/532 V BATT 1000 p 180 k 0.01 µ 0.1 µ 180 k C 2200 p (1) Unit R: Ω C: F 13

14 Sample Connection Circuit between HA16103 and H8/532 (2) S1 IGN. SW V Z1 Q1 C1 100 µ R1 Q2 R5 C2 V Z2 V CC V CONT V OUT Voadj VNMIadj NMI HA16103 GND V adj CLK Rf Cf RR CR C R4 R2 R3 Q3 NMI V CC H8/532 PORT GND VBATT 1000 p 180 k 0.01 µ 180 k 0.1 µ 2200 p V OUT HA16103 NMI GND V adj CLK Rf Cf RR CR C NMI V CC H8/532 PORT GND 1000 p 180 k 0.01 µ 180 k 0.1 µ 2200 p Unit R: Ω C: F 14

15 Precautions If the IC s ground potential varies suddenly by several volts due to wiring impedance (see figure 6), a false pulse may be output. The reason for this is that potentials in the pulse generating circuit change together with the V OUT -GND potential. The reference potential of the comparator in figure 7 and the potential of the external capacitor have different impedances as seen from the comparator, causing a momentary inversion. The solution is to stabilize the ground potential. Two ways of stabilizing the IC s ground line are: Separate the IC s ground line from highcurrent ground lines. Increase the capacitance (Co) used to smooth the V OUT output. Wiring impedance SW1 SW2 HA16103PJ/FPJ Co R L V IGN Wiring impedance Relay or other load Figure 6 Typical Circuit Vout V CC Vcont Wiring impedance C + GND Figure 7 Comparator 15

16 Low-voltage inhibit section Low-Voltage Reset Pulse Delay vs. C Low-Voltage Reset Pulse Delay t (sec) 3 m 2 m 1 m T a = 25 C V CC = 12 V R 1= 30 kω Rf = 360 kω Rf = 560 kω Rf = 180 kω p 2000 p 3000 p 5000 p 7000 p p C (F) Permissible P-RUN Pulse Duty Cycle vs. P-RUN Pulse Frequency 20 k 10 k 5 k Ta = 25 C V IN = 12 V P-RUN Pulse Frequency (Hz) 2 k 1 k Permissible P-RUN duty cycle duty = A B B A + B 100 Runaway detected at 100% P-RUN Pulse Duty Cycle (%) 16

17 Low-voltage inhibit section Low-Voltage Reset Pulse Recovery Delay vs. C Low-Voltage Reset Pulse Recovery Delay t r (sec) 3 m 2 m 1 m Ta = 25 C V CC = 12 V R 1= 30 kω Rf = 560 kω Rf = 360 kω Rf = 180 kω p 2000 p 3000 p 5000 p 7000 p p C (F) Power-on and auto-reset section Reset Low Time vs. Resistance R R 160 m Ta = 25 C 140 m V CC = 12 V V OUT = 5 V typ 120 m Reset Low Time t RL (s) 100 m 80 m 60 m 40 m R C = 0.22 µf C = 0.1 µf R 20 m C = µf k 200 k 300 k 500 k Resistance R R (Ω) R 17

18 Power-on and auto-reset section 700 m 600 m Clock-Off Time vs. Resistance R R Ta = 25 C V CC = 12 V V OUT = 5 V typ Clock-Off Time t OFF (s) 500 m 400 m 300 m 200 m C = 0.22 µf R C R = 0.1 µf 100 m C R = µf k 200 k 300 k 500 k Resistance R R (Ω) Vref section Output Voltage vs. Adjustment Resistance Ta = 25 C V CC = 12 V Output Voltage V OUT (V) k 100 k 1 M V OUT Adjustment Resistance R 1 (Ω) 18

19 Power-on and auto-reset section Reset High Time vs. Resistance R R Reset High Time t RH (s) 280 m 260 m 240 m 220 m 200 m 180 m 160 m 140 m 120 m 100 m 80 m 60 m 40 m Ta = 25 C V CC = 12 V V OUT = 5 V typ C = 0.22 µf R C = 0.1 µf R 20 m C R = µf k 200 k 300 k 500 k Resistance R R (Ω) 19

20 Package Dimensions Unit: mm Max *0.22 ± ± Max 2.20 Max *0.42 ± ± ± ± *Dimension including the plating thickness Base material dimension 0.12 M Hitachi Code JEDEC EIAJ Mass (reference value) FP-20DA Conforms 0.31 g 20

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