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HA16129FPJ

Single Watchdog Timer

Renesas Electronics 

HA16129FPJ

Single Watchdog Timer

REJ03F0144-0300

(Previous: ADE-204-027B)

Rev.3.00

Jun 15, 2005

Description

The HA16129FPJ is a watchdog timer IC that monitors a microprocessor for runaway. In addition to the watchdog

timer function, the HA16129FPJ 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 HA16129FPJ incorporates both Vout overvoltage prevention and current limiter 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.

Rev.3.00 Jun 15, 2005 page 1 of 22

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