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HA16129AFPJ Datasheet(PDF) 1 Page - Renesas Technology Corp |
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HA16129AFPJ Datasheet(HTML) 1 Page - Renesas Technology Corp |
1 / 23 page Rev.1.00 Jun 15, 2005 page 1 of 22 HA16129AFPJ Single Watchdog Timer REJ03F0143-0100 (Previous: ADE-204-067) Rev.1.00 Jun 15, 2005 Description The HA16129AFPJ is a watchdog timer IC that monitors a microprocessor for runaway. In addition to the watchdog timer function, the HA16129AFPJ also provides a function for supplying a high-precision stabilized power supply to the microprocessor, a power on reset function, a power supply voltage monitoring function, and a fail-safe function that masks the microprocessor outputs if a runaway is detected. Functions • Watchdog timer (WDT) function Monitors the P-RUN signal output by the microprocessor, and issues an auto-reset (RES) signal if a microprocessor runaway is detected. • Stabilized power supply Provides power to the microprocessor. • Power on and clock off functions The power on function outputs a low level signal to the microprocessor for a fixed period when power is first applied. The clock off function outputs a RES signal to the microprocessor a fixed period after a runaway occurs. • Power supply monitoring function When the reference voltage (Vout) falls and becomes lower than the NMI detection voltage (4.63 V, Typ) or the STBY detection voltage (3.0 V Typ), this function outputs either an NMI signal or an STBY signal, respectively. Note that NMI detection can be set to monitor either VCC or Vout. • OUTE function *1 (fail-safe function) Outputs a signal used to mask microprocessor outputs when a microprocessor runaway has been detected. • RES delay function Sets the delay between the time the NMI signal is output and the time the RES signal is output. • Protection functions • The HA16129AFPJ incorporates both Vout overvoltage prevention and short detection functions. Note: 1. OUTE function: OUTE is an abbreviation for output enable. Features • High-precision output voltage: 5.0 V ± 1.5% • The WDT supports both frequency and duty detection schemes. • High-precision power supply monitoring function: 4.625 V ± 0.125 V • Built-in OUTE function • All functions can be adjusted with external resistors and/or capacitors. |
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