HA16117F Series

4

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 I

output, the shorter the time during which I

If the duty cycle is high enough then C

at a high potential, preventing the multivibrator from firing, and the

RES output remains high.

Absolute Maximum Ratings (Ta = 25

°C)

Ratings

Item

Symbol

HA16117FPA/FPB/FPC

HA16117FPAJ/FPBJ/FPCJ

Unit

Power supply voltage

V

CC

–0.3 to +14

–0.3 to +14

V

P-RUN input voltage

V

P

V

CC

V

CC

V

ACC input voltage

V

ACC

14

14

V

RES output current

I

RES

10

10

mA

Permissible dissipation *

1

P

T

300

300

mW

Operating temperature range

Topr

–30 to +85

–40 to +85

°C

Storage temperature

Tstg

–55 to +125

–55 to +125

°C

Note:

1. This is the value when mounted on a glass epoxy substrate with 30% wiring density, up to an

ambient temperature of 83

°C. Above that temperature, derate by 7.14 mW/°C.

40mm

Substrate

0.8 mm ceramic or

1.5 mm epoxy

400

300

200

100

0

−30 −20 0 20 40

Ambient operating temperature range Ta (

60 80

85

°C

(30% wiring density)

83

°C

100