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HA16129

Single Watchdog Timer

Hitachi -> Renesas Electronics 

HA16129FPJ

Single Watchdog Timer

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 (4.63V,

Typ) or the STBY detection voltage (3.0V 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.

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