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HA16117F

CMOS Watchdog Timer

Renesas Electronics 

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).

HA16117FPA/FPAJ

HA16117FPB/FPBJ

HA16117FPC/FPCJ

Type No.

4.4 V Typ

4.2 V Typ

4.0 V Typ

Low Threshold Voltage (VTL)

Rev.3.00 Jun 15, 2005 page 1 of 30

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