HA16117F Series CMOS Watchdog Timer REJ03F0142-0300 (Previous: ADE-204-018B) Rev.3.00 Jun 15, 2005 Description The HA16117F Series of ICs make a micro-processor (MPU) system fail-safe by monitoring its power supply to detect voltage drops, and monitoring a P-RUN (program running) pulse to detect system crashes. Also referred to as watchdog timers, these devices are essential in systems that aim for high levels of crash protection. Fabricated by a CMOS process, they consume little power and are ideally suited for battery-operated systems. These ICs are available in versions for industrial and communications equipment and automotive applications, as well as for consumer products. Functions • ower-on reset Sends a RES signal to the MPU for a fixed time at power-on • Watchdog timer (WDT) Monitors a P-RUN signal from the MPU and sends the MPU a RES signal if P-RUN departs from a set frequency range • Auto-reset Outputs RES signals to the MPU at clocked intervals while P-RUN remains abnormal • Supply voltage supervision Outputs a low RES signal if the supply voltage (same as the MPU's VCC) falls below a low threshold level (VTL). The threshold differs for different ICs in the series, allowing designers to choose an IC matching system requirements (see ordering information) Features • Low power consumption • • • • • : Operating (ACC pin low) = 0.5 mW (Typ) : Standby (ACC pin high) = 0.2 mW (Typ) Watchdog timer on/off control by ACC input signal Independent auto-reset high and low times (tRH and tRL) Watchdog monitoring by frequency filtering (independent of duty cycle) High-precision low voltage detection (±2%) Space- and weight-saving 8-pin SOP package Ordering Information The HA16117F Series includes three ICs with different low threshold levels (VTL). Type No. Low Threshold Voltage (VTL) HA16117FPA/FPAJ HA16117FPB/FPBJ 4.4 V Typ 4.2 V Typ HA16117FPC/FPCJ 4.0 V Typ Rev.3.00 Jun 15, 2005 page 1 of 30 HA16117F Series Pin Arrangement VCC P-RUN CF CR 1 2 3 4 8 7 6 5 Tadj ACC GND RES (Top view) Pin Description Pin No. Symbol Function 1 VCC Power supply voltage input 2 3 P-RUN CF Watchdog timer (WDT) input Connected capacitor CF determines WDT filter characteristic (normal frequency range) 4 CR 5 RES Connected capacitor CR determines tON for power-on reset and tOFF, tRH, and tRL for auto-reset Reset signal output from WDT and voltage supervision circuits 6 7 GND ACC Ground WDT on/off control input (on when ACC is low) 8 Tadj * For adjusting tRH and tOFF (divide VCC to get the adjustment voltage) Note: The low-voltage threshold cannot be modified by changing the external resistors connected to the Tadj pin. Rev.3.00 Jun 15, 2005 page 2 of 30 HA16117F Series Block Diagram VCC 5V 6 1 2.52 (117FA) 2.36 (117FB) 2.20 (117FC) GND 1 Low voltage detector − + ≈1.25 V COMP. GND RES 4 0.1 µ CR 5 I1 Power-on and auto-reset circuit (*I1 < I2) − + SW2 I2 adjustment R1 510 k 8 Tadj R2 750 k to Microcomputer COMP. SW1 I2 (SW1 and SW2 are active high) Watchdog timer Watchdog filter (f-duty converter) W.D out duty (%) P-RUN 1/2 frequency W.D in 2 divider duty 50% Normal range n W.D out fL/2 fH/2 duty n% W.D in frequency (Hz) 3 PULSE from I/O port CF 0.01 µ Mode ACC Voltage Operating Low Function Low voltage detection and WDT Standby High Low voltage detection 7 ACC Operating: "Low" Standby: "High" Note: The power-on reset circuit operates in both operating and standby modes. The HA16117F consists of a low voltage detector, power-on and auto-reset circuit, and watchdog timer. Low Voltage Detector Uses a reference voltage source (≈ 1.25 V) and high-precision comparator to detect drops in the supply voltage. Power-On and Auto-Reset Circuit Generates the RES waveform, using a multivibrator consisting of a current source I1 that charges the external capacitor CR, a current source I2 that discharges CR, and a comparator. Watchdog Timer Reshapes the P-RUN signal (programming-running pulse) from the MPU to obtain a 50% duty cycle, then converts frequency to duty cycle in the watchdog filter (WD filter). The watchdog filter is a bandpass filter. The duty cycle of the filter output is highest in the normal frequency range of PRUN. The watchdog filter output controls I2 in the multivibrator, the higher the duty cycle of the watchdog filter output, the shorter the time during which I2 discharges CR. If the duty cycle is high enough then CR is held at a high potential, preventing the multivibrator from firing, and the RES output remains high. Rev.3.00 Jun 15, 2005 page 3 of 30 HA16117F Series Absolute Maximum Ratings (Ta = 25°C) Item Symbol Ratings HA16117FPA/FPB/FPC HA16117FPAJ/FPBJ/FPCJ Unit Power supply voltage P-RUN input voltage VCC VP –0.3 to +14 VCC –0.3 to +14 VCC V V ACC input voltage RES output current VACC IRES 14 10 14 10 V mA PT Topr 300 –30 to +85 300 –40 to +85 mW °C 1 Permissible dissipation * Operating temperature range Storage temperature Tstg –55 to +125 –55 to +125 °C Note: 1. This is the value when mounted on a glass epoxy substrate with 30% wiring density, up to an ambient temperature of 83°C. Above that temperature, derate by 7.14 mW/°C. Permissible dissipation PT (mW) 40mm Substrate 0.8 mm ceramic or 1.5 mm epoxy 400 300 200 83°C −7.14 mW/°C (30% wiring density) 100 85°C 0 −30 −20 0 20 40 60 80 100 Ambient operating temperature range Ta (°C) Rev.3.00 Jun 15, 2005 page 4 of 30 HA16117F Series Electrical Characteristics (VCC = 5 V, Ta = 25°C, CF = 0.01 µF, CR = 0.1 µF, R1 = 510 kΩ, R2 = 750 kΩ) General Low voltage detector Item Operating supply current Symbol Min Typ Max Unit ICC1 – 100 – µA VACC = 0 V, fP-RUN = 100 Hz ICC2 – 200 600 µA VACC = 0 V, fP-RUN = 20 kHz Standby supply current ISTBY – 43 100 µA VACC = 12 V Low voltage threshold level VTL 4.3 4.1 4.4 4.2 4.5 4.3 V V When VCC drops HA16117FPA/FPAJ HA16117FPB/FPBJ HA16117FPC/FPCJ 3.9 4.0 4.1 V Hysteresis width VHYS 50 100 150 mV ACC Low input voltage High input voltage VIL1 VIH1 – – 0.8 2.0 – – V V P-RUN input Low input voltage High input voltage VIL2 VIH2 – – 0.8 2.0 – – V V WDT Power-on reset time Reset-clock off time tON 1 tOFF * 24 78 40 130 56 182 ms ms Reset low time Reset high time tRL tRH 12 36 20 60 28 84 ms ms Low setup time High setup time tSL tSH 1 – – – – 1 ms ms RES low voltage RES high voltage VOL VOH – – 0.4 – VCC – Reset function starting voltage Constant range of R1 and R2 VRES K – 0.8 0.6 1.4 0.8 V 6.0 V RES output Constant range Test Conditions 0.55 Operating supply voltage range VCCRNG VTL – Note: 1. Reset-clock off time tOFF is provided a shown in the under figure. f = 500 Hz, Duty = 50% P-RUN RES Rev.3.00 Jun 15, 2005 page 5 of 30 tOFF V V – P-RUN pin = 0 V IOL = 1 mA Open K =R2 / (R1 + R2) HA16117F Series Timing Waveforms and Functional Description VTL VCC P-RUN Crash t RH Watchdog function on RES (VACC = "Low") t ON t OFF t ON t RL Watchdog function off RES (VACC = "High") t ON t ON Figure 1 Timing Waveforms Watchdog On/Off Function A feature of the HA16117F is that watchdog supervision can be switched on and off. When the watchdog function is switched on, both the supply voltage and P-RUN input are monitored to detect abnormal conditions. When the watchdog function is switched off (standby mode), only the supply voltage is monitored. Watchdog supervision is switched on and off by the input at the ACC pin (pin 7): Supervision is on when ACC is low, and off when ACC is high. Many MPUs have a standby mode in which the CPU stops running but memory contents are retained. In standby mode, program execution halts and I/O ports go to the high-impedance state, so there is no need for the watchdog timer to supervise pulse output from an I/O port to detect abnormal conditions. Power can be saved by placing both the MPU and HA16117F in standby mode at the same time. The HA16117F is designed to draw a typical standby current I STBY of only 43 µA Typ when the watchdog function is switched off. ACC Pin (pin 7) and RES Output When the MPU returns from standby mode to normal operation it generally takes 10 to 200 ms for the clock oscillator in the MPU to stabilize. The RES signal is not output during this setup time. After the setup time (tSL) has elapsed, RES is output if the P-RUN signal from the MPU is still abnormal. Adjust according to MPU's setup time ACC pin t SH t SL RES (due to MPU crash) Figure 2 ACC Pin and RES Output Rev.3.00 Jun 15, 2005 page 6 of 30 HA16117F Series Internal Operation and Usage Notes Figure 3 shows an equivalent circuit of the watchdog timer block with a VCC pin level of 5 V and ACC pin level of 0 V, and the following pages show internal operation timing charts for different P-RUN frequencies. (Descriptions apply to conditions CF = 0.01 µF, CR = 0.1 µF, R2/(R1 + R2) = 0.6.) Operation The power-on and auto-reset circuit is a multivibrator with timing controlled by CR charge current I1 and discharge current I2. As I1 : I2 ≈ 3 : 1 (Typ design value), when the (WD) (watchdog filter circuit output) on-duty is 25% or above, the CR pin potential does not fall below 1.6 V. Therefore, (C) in the figure below is fixed low, and RES is not output. The (WD) on-duty varies according to the P-RUN frequency. If the frequency is lower or higher than the design value, the (WD) on-duty decreases, and at 25% or below, RES is output. Refer to the timing charts on the following pages for an explanation of the operation of the watchdog filter. Usage Notes • When the P-RUN frequency reaches 20 kHz or above, tOFF is short (see the timing charts on the following pages). This must be borne in mind in the design stage. • If the P-RUN frequency fluctuates, RES may also be output within the normal detection set frequency (see the timing charts on the following pages). • Detection frequencies fH and fL described in the Data Book are Typ values, and a certain amount of dispersion can be expected. A margin of ±30% or more should be allowed for in the design. 0.1 µ A VCC (5 V) Iw 0.8 µ typ 3.6 V Low voltage detection block CR I1 8 µ typ − + − + 3.2 V 1.6 V CF Q 0.9 V 0.01 µ P-RUN C − + WD D Q B I2 10.7 µ typ φ Q Q 1/2 frequency divider Watchdog filter circuit Power-on and auto-reset circuit Figure 3 Watchdog Timer Evaliation Circuit Rev.3.00 Jun 15, 2005 page 7 of 30 RES HA16117F Series 1. When P-RUN signal is not input The watchdog filter circuit output (WD) is fixed low, so the RES signal is output as shown in the figure below in accordance with power-on and auto-reset circuit CR charge/discharge. H P-RUN L H Q L H Q L H A L 5V 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V CR 1.6 V 0V H B L H C L H RES L 20 ms Rev.3.00 Jun 15, 2005 page 8 of 30 60 ms HA16117F Series 2. With a low-frequency P-RUN signal (≈ 13 Hz to 26 Hz) When fP-RUN is 13 Hz to 26 Hz, the WD duty (D = 100 × t2/2T) is 25% to 50%. When the WD duty is 25% or above, multivibrator (power-on and auto-reset circuit) oscillation stops. As a result, the RES signal is fixed high. 40 ms (25 Hz) H P-RUN L H Q L 2T H Q L H A L 5V 3.6 V CF 0.9 V 0V t1 5 µs H WD t2 33 ms L 5V 3.2 V CR 1.6 V 0V H B L H C L H 60 ms RES L 20 ms Rev.3.00 Jun 15, 2005 page 9 of 30 HA16117F Series 3. With a 10 kHz P-RUN signal When fP-RUN is 10 kHz, the WD duty (D = 100 × (T − t2)/2T) is 48%. As the duty is above 25%, the multivibrator (power-on and auto-reset circuit) does not oscillate. The RES signal remains high. 100 µs (10 kHz) H P-RUN L H Q L 2T H Q L H A L 5V 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V CR 1.6 V 0V H B L H C L H RES L Rev.3.00 Jun 15, 2005 page 10 of 30 t1 5 µs HA16117F Series 4. With a 150 kHz P-RUN signal When fP-RUN is 100 kHz or above, the WD duty (D = 100 × (T − t2)/2T) is 25% or below. Therefore, CR is discharged, and the RES signal is output at the instant that the pin potential falls to the comparator circuit threshold value (VTL = 1.6 V). 6.6 µs (150 kHz) H P-RUN L H Q L 2T H Q L H A L 5V t1 5 µs 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V CR 1.6 V 0V H B L H C L H RES L Rev.3.00 Jun 15, 2005 page 11 of 30 HA16117F Series 5. tOFF when P-RUN signal ≈ 90 kHz When the P-RUN frequency is high, even though within specification, the CR pin potential falls. If the P-RUN frequency falls sharply at this time, tOFF may be short. With values of CF = 0.01 µF and CR = 0.1 µF, the CR pin potential will not fall as long as the P-RUN frequency is 20 kHz or below. H fP_RUN ≈ 90 kHz 50 ms P-RUN L H Q L H Q L H A L 5V 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V ≈ 2.3 V CR 1.6 V 0V H B L H C L H RES L tOFF 26 ms Rev.3.00 Jun 15, 2005 page 12 of 30 HA16117F Series 6. When P-RUN frequency fluctuates (1) If there is a double-pulse in P-RUN, the WD filter duty will be decreased and RES will be output, as shown in the figure below, for example. In this case, the condition for non-output of the RES signal is a value of 3 or less for the ratio of P-RUN pulse interval minimum value to maximum value (when fP-RUN ≤ 20 kHz). This is because the CR pin charge/discharge current ratio is 3. 2 ms H 28 ms P-RUN L H Q L H Q L H A L 5V 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V CR 1.6 V 0V H B L H C L H RES L 20 ms Rev.3.00 Jun 15, 2005 page 13 of 30 HA16117F Series 7. When P-RUN frequency fluctuates (2) If there is a double-pulse in P-RUN, RES will not be output as long as the ratio of P-RUN pulse interval minimum value to maximum value is 3 or less. The timing chart for a P-RUN minimum interval of 8 ms and maximum interval of 22 ms is shown below. 8 ms H P-RUN L H Q L H Q L H A L 5V 3.6 V CF 0.9 V 0V H WD L 5V 3.2 V CR 1.6 V 0V H B L H C L H RES L Rev.3.00 Jun 15, 2005 page 14 of 30 22 ms HA16117F Series 8. Summary of cases where P-RUN frequency fluctuates If there is a double-pulse in P-RUN, RES may be output if the double-pulse has multiple frequency components. If the P-RUN frequency fluctuates, refer to the following when making the P-RUN setting. • P-RUN normal detection region, duty dependency 1M Note: 1 When fP-RUN ≥ 20 kHz, tOFF is frequency-dependent, so care is required when making the P-RUN setting (see figure below). P-RUN frequency fP-RUN (Hz) 100 k 10 k 1k Normal detection region*2 100 10 1 0 50 100 P-RUN pulse duty D (%) Note: 2. This is the region when fP-RUN is constant. If fP-RUN fluctuates within the normal detection region, the following applies: Normal detection is performed when the condition fP-RUN H/fP-RUN L < M is satisfied. CR voltage VCR (V) • fP-RUN dependency of VCR, tOFF, M 5 tOFF (s) 4 100 m 3 50 m 3 2 M 2 Multivibrator threshold voltage (1.6 V) 0 1 0 1k 3k 5 k 7 k 10 k P-RUN frequency (Hz) Rev.3.00 Jun 15, 2005 page 15 of 30 30 k 50 k 70 k 100 k 1 HA16117F Series Setting of RES Timing and Watchdog Frequency Range Different MPUs have different RES timing requirements. The minimum reset time (tON) required at power-on (rise of VCC) is 20 ms for some MPUs and 100 ms for others. RES timing waveform parameters must be selected according to the MPU. With the HA16117F the timing of the RES output and the watchdog frequency range can both be set by external constants (CF, CR, and K). Parameters Item Symbol Power-on reset time tON Reset-clock off time Reset low time tOFF tRL Reset high time Watchdog frequency high tRH fH CR (pin 4) 1 CF (pin 3) K (pin 8) * 2 S* Watchdog frequency low fL Notes: 1. K = R2 / (R1 + R2) 2. Variability of tOFF increases with increasing CF. The variability ∆tOFF is approximately 3.3 (MΩ) × CF (µF), so CF ≤ 0.01 (µF) is recommended. 3. External constants should be selected with reference to the formulas in tables 1 and 2. Table 1 Calculation of RES Output Timing Item Formula Notes tON (ms) tOFF (ms) 400 (Ω) × CR (µF) 1.99 × tRH (ms) tON and tOFF can be set independently tRL (ms) tRL and tRH can be set independently tRH (ms) 0.5 × tON (ms) 1.6 (V) × CR (µF) × 103 K × 31 (µA) − 15.8 (µA) tSL (ms) ≈ tOFF (ms) Table 2 Calculation of Watchdog Frequency Range Item fH (MHz) fL (Hz) Formula 1 tRH (ms) − tRL (ms) × 500 (Ω) × CF (µF) tRH (ms) + tRL (ms) 1 tRL (ms) × 1.7 (MΩ) × CF (µF) tRH (ms) + tRL (ms) Whichever is larger Rev.3.00 Jun 15, 2005 page 16 of 30 or 1 × 103 tOFF (ms) HA16117F Series Selection of External Constants If the reset duration necessary for the MPU to operate reliably at power-on is known, there is a simple procedure for selecting external constants, starting from the power-on reset time (tON). START Set power-on reset time tON Set reset high time tRH Select external constant CF External constant Check watchdog values frequency range fH and fL • Decide reset-clock off time (tOFF) • Select external constants R1 and R2 • Decide reset low time (tRL) • Select external constant CR Figure 4 Procedure for Selecting External Constants Application Example SW R1 510 kΩ Battery 5V regulator CF 0.01 µF CR 0.1 µF Rev.3.00 Jun 15, 2005 page 17 of 30 VCC Tadj P-RUN ACC HA16117F GND CF CR RES R2 750 kΩ VCC Microprocessor system RES PORT GND HA16117F Series Operating Characteristics and Test Circuits 510 k 5V VTL 5V 0V VCC VCC Tadj 750 k P-RUN ACC 0V tON 5V 0.01 µ CF GND CR RES 0.1 µ RES Oscilloscope Circuit for measuring tON 0V 50 ms/div time Power-on reset time (tON) 5V 5V 0V f = 500Hz duty 50% SW,OFF 5V 510 k VCC P-RUN Tadj 750 k P-RUN ACC 50½ 0V 5V tOFF RES 0.01 µ CF GND CR RES 0.1 µ Oscilloscope 0V Circuit for measuring tOFF time 50 ms/div Reset-clock off time (tOFF) tRH 5V 510 k VCC RES P-RUN ACC CR 0.01 µ 0V GND CR RES 0.1 µ Oscilloscope time RES and CR waveforms at detect abnormal conditions Rev.3.00 Jun 15, 2005 page 18 of 30 CF Oscilloscope tRL 20 ms/div Tadj 750 k 5V Circuit for measuring RES and CR waveforms HA16117F Series Low Voltage Threshold vs. Ambient Temperature 5.0 12 V Low voltage threshold VTL (V) HA16117FA VTL -Ta 510 k VCC 4.5 VCC P-RUN ACC (−50ppm/°C) 0.01 µ 4.0 Tadj 0.1 µ CF GND CR RES 750 k 5V regulator Oscilloscope 3.5 −30 0 50 85 Test circuit Ambient temperature Ta (°C) Threshold Hysteresis Width vs. Ambient Temperature Threshold hysteresis width VHYS (mV) 150 12V HA16117FA VHYS -Ta 510k VCC 100 VCC 0.01µ 50 Tadj P-RUN ACC CF GND CR RES 750k 0.1µ Oscilloscope 0 −30 0 50 Ambient temperature Ta (°C) Rev.3.00 Jun 15, 2005 page 19 of 30 85 Test circuit 5V regulator HA16117F Series Operating Supply Current vs. P-RUN Input Frequency 500 µ Operating supply current ICC (A) Ta = 25°C 100 µ 10 µ 100 1k 10 k P-RUN input frequency fP-RUN (Hz) A ICC 510 k VCC pin 5V Pulse genelator 0.01 µ VCC 0 V to 5 V Tadj P-RUN ACC CF GND CR RES 0.1 µ Test circuit Rev.3.00 Jun 15, 2005 page 20 of 30 750 k 20 k HA16117F Series Standby Supply Current vs. Supply Voltage 200 µ Ta = 25°C VCC ISTBY V Standby supply current ISTBY (A) A VCC Tadj 510 k 750 k P-RUN ACC 100 µ 12 V 0.01 µ CF GND CR RES 0.1 µ Test circuit 0 7 5 Supply Voltage VCC (V) Supply Current vs. Ambient Temperature Supply current ISTBY, ICC (A) 300 µ f = 20 kHz ICC 200 µ 100 µ f = 100 Hz ICC ISTBY 0 −30 0 50 Ambient temperature Ta (°C) Rev.3.00 Jun 15, 2005 page 21 of 30 85 HA16117F Series RES Low Voltage vs. RES pin Sink Current RES low voltage VOL (V) 0.4 VCC 0.3 5V 0.2 N 6 ≈1 0Ω P-RUN ACC ) (R O Tadj CF GND CR RES 0.01 µ 0.1 V Test circuit 0 0.5 m 1m 1.5 m RES pin sink current IOL (A) RES Low Voltage vs. Ambient Temperature RES low voltage VOL (V) 0.3 IOL = 1mA 0.2 0.1 0 −30 0 50 Ambient temperature Ta (°C) Rev.3.00 Jun 15, 2005 page 22 of 30 51 k 75 k 85 Io sink HA16117F Series RES High Voltage vs. RES pin Source Current 5 RES high voltage VOH (V) Ta = 25°C VCC 5V Tadj P-RUN ACC 4 0.01 µ CF GND CR RES 0.1 µ V Test circuit 3 500 µ 0 RES pin source current Io source (A) Rev.3.00 Jun 15, 2005 page 23 of 30 51 k 75 k Io sink HA16117F Series Power-on Reset Time vs. CR Capacitance 1 Ta = 25°C Tadj Power-on reset time tON (sec) VCC 5V 510 k 750 k P-RUN ACC 100 m 0.01 µ CF GND CR RES CR Oscilloscope 10 m VCC RES tON Test circuit 1m 0.01 µ 0.1 µ 1.0 µ External capacitance CR (F) RES Output Timing vs. CR Capacitance 1 RES output timing tRH, tRL (sec) Ta = 25°C VCC 100 m tRH 5V 0.01 µ tRL Tadj 510 k 750 k P-RUN ACC CF GND CR RES CR 10 m Oscilloscope tRH RES 1m 0.01 µ 0.1 µ External capacitance CR (F) Rev.3.00 Jun 15, 2005 page 24 of 30 5V 0V 1.0 µ Test circuit HA16117F Series High Setup Time vs. CR Capacitance 1000 µ High setup time tSH (sec) Ta = 25°C 100 µ Tadj VCC 5V 10 µ 0.01 µ 510 k 750 k P-RUN ACC CF GND CR RES 0V RES CR tSH Oscilloscope Test circuit 1µ 0.01 µ 0.1 µ 1.0 µ External Capacitance CR (F) Low Setup Time vs. CR Capacitance 10 Ta = 25°C VCC Low setup time tSL (sec) 5V P-RUN ACC 1 0.01 µ Tadj 510 k 750 k CF GND CR RES CR Oscilloscope 100 m 15 V 0V RES 10 m 0.01 µ 0.1 µ External Capacitance CR (F) Rev.3.00 Jun 15, 2005 page 25 of 30 tSL 1.0 µ Test circuit HA16117F Series Reset High Time vs. K (Tadj Constant) Reset high time tRH (sec) 100 m VCC 5V 0.01 µ 10 m 0.56 0.6 0.7 R1 R2 Tadj P-RUN ACC CF GND CR RES 0.1 µ 0.8 Oscilloscope Tadj constant K K= Test circuit R2 R1 + R2 Duty-cycle dependence of P-RUN normal frequency range 1M MPU system abnormal P-RUN input frequency fP-RUN (Hz) 100 k 5V Abnormal if duty cycle is 0% VCC 10 k Pulse generator 1k 0V Abnormal if duty cycle is 100% 100 P-RUN ACC 5V MPU system normal 0.01 µ Tadj 510 R 750 R CF GND CR RES 0.1 µ Oscilloscope Test circuit 10 MPU system abnormal 1 0 50 100 P-RUN input pulse duty cycle (%) Rev.3.00 Jun 15, 2005 page 26 of 30 Notes: 1. Normal detection is assumed when RES is not output. 2. The figure at left is for a constant P-RUN frequency. See "8. Summary of cases where P-RUN frequency fluctuates" for cases where the frequency fluctuates. HA16117F Series P-RUN Input Frequency vs. K (Tadj constant) 1M Ta = 25°C R2 R 1 + R2 K= 100 k P-RUN input frequency fP-RUN (Hz) R1 R2 5V VCC Pulse generator 10 k Tadj P-RUN ACC 5V 0V CF GND CR RES duty 50% 1k MPU system normal 0.01 µ 0.1 µ Oscilloscope 100 K= R2 R 1 + R2 Test circuit 10 MPU system abnormal 1 0.55 0.6 0.7 Tadj constant K Notes: 1. Normal detection is assumed when RES is not output. 2. The figure at left is for a constant P-RUN frequency. 0.8 P-RUN High Threshold Frequency vs. CF Capacitance 10 M Ta = 25°C P-RUN high threshold frequency fH (Hz) 510 k VCC 5V Tadj P-RUN ACC 750 k MPU system abnormal 1M Pulse generator CF CF GND CR RES CR Oscilloscope 100 k 0 V to 5 V duty 50% Test circuit MPU system normal Notes: 1. Normal detection is assumed when RES is not output. 10 k 500 p 1000 p 2. The figure at left is for a constant P-RUN frequency. 0.01 µ 0.03 µ External capacitance CF (F) Rev.3.00 Jun 15, 2005 page 27 of 30 HA16117F Series P-RUN Low Threshold Frequency vs. CF Capacitance 1k P-RUN low threshold frequency fL (Hz) Ta = 25°C VCC Normal P-RUN ACC 5V CR = 0.01 µF 100 Tadj 51 k 75 k CF GND CR RES Pulse generator CR = 0.1 µF Abnormal CF 10 Oscilloscope CR Test circuit CR = 1.0 µF Notes: 1. Normal detection is assumed when RES is not output. 1 500 p 1000 p 2. The figure at left is for a constant P-RUN frequency. 0.01 µ 0.03 µ External Capacitance CF (F) P-RUN Input Frequency vs. Ambient Temperature 1M P-RUN abnormal VCC P-RUN input frequency fP-RUN (Hz) 100 k P-RUN ACC 5V fH 10 k duty 50% CF GND CR RES Pulse generator P-RUN normal 1k Tadj 510 k 750 k Oscilloscope 100 0.01 µ fL 0.1 µ Test circuit 10 P-RUN abnormal 1 −30 0 50 Notes: 1. Normal detection is assumed when RES is not output. 85 Ambient temperature Ta (°C) Rev.3.00 Jun 15, 2005 page 28 of 30 2. The figure at left is for a constant P-RUN frequency. HA16117F Series Power-on reset time tON (ms) Power-on Reset Time vs. Ambient Temperature 100 VCC 5V Tadj 510 k 750 k P-RUN ACC CF GND CR RES 50 tON 0.01 µ CR Oscilloscope 0 −30 0 50 100 VCC Ambient temperature Ta (°C) RES Power-on Reset Time vs. Ambient Temperature tON Test circuit tRH and tRL vs. Ambient Temperature 100 VCC 5V 70 P-RUN ACC tRH and tRL (ms) tRH 50 0.01 µ Tadj 51 k 75 k CF GND CR RES 0.1 µ Oscilloscope 30 tRH tRL 5V 0V 0 −35 0 50 Ambient temperature Ta (°C) Rev.3.00 Jun 15, 2005 page 29 of 30 85 tRL Test circuit HA16117F Series Package Dimensions JEITA Package Code P-SOP8-4.4x4.85-1.27 RENESAS Code PRSP0008DE-A *1 Previous Code FP-8D D 8 MASS[Typ.] 0.1g NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET. F 5 bp c c1 *2 E HE b1 Reference Symbol Terminal cross section Index mark Dimension in Millimeters Min Nom Max D 4.85 5.25 E 4.4 A2 A1 4 1 Z e *3 0.00 bp x M bp L1 c 0.34 A A1 θ y Detail F 0.42 0.50 0.40 0.17 c1 L 0.20 2.03 b1 0.22 0.27 0.20 θ 0° HE 6.35 8° 6.50 6.75 1.27 e x 0.12 y 0.15 Z 0.75 0.42 L L Rev.3.00 Jun 15, 2005 page 30 of 30 0.10 A 1 0.60 1.05 0.85 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. 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