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HA16117FPC Datasheet(PDF) 3 Page - Renesas Technology Corp |
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HA16117FPC Datasheet(HTML) 3 Page - Renesas Technology Corp |
3 / 31 page HA16117F Series Rev.3.00 Jun 15, 2005 page 3 of 30 Block Diagram 1 6 5 8 2 3 7 − + 4 − + 5 V 0.1 µ VCC GND CR Tadj R1 510 k R2 750 k P-RUN 0.01 µ CF ACC PULSE from I/O port W.D in SW2 ≈1.25 V 2.52 (117FA) 2.36 (117FB) 2.20 (117FC) SW1 COMP. COMP. to Micro- computer RES W.D in frequency (Hz) duty 50% W.D out W.D out duty (%) duty n% 1/2 frequency divider GND 1 Operating: "Low" Standby: "High" n fL/2 fH/2 Normal range I2 I2 adjustment I1 Power-on and auto-reset circuit (*I1 < I2) (SW1 and SW2 are active high) Watchdog filter (f-duty converter) Watchdog timer Low voltage detector ACC Voltage Function Low Low voltage detection and WDT Low voltage detection Mode Operating Note: The power-on reset circuit operates in both operating and standby modes. Standby High 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 I 1 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 P- RUN. 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. |
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