HA16117F Series
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
2
in the multivibrator, the higher the duty cycle of the watchdog filter
output, the shorter the time during which I
2
discharges C
R
. If the duty cycle is high enough then C
R
is held
at a high potential, preventing the multivibrator from firing, and the
RES
output remains high.
Absolute Maximum Ratings
(Ta = 25°C)
Ratings
Item
Power supply voltage
P-RUN input voltage
ACC input voltage
RES output current
Permissible dissipation *
1
Operating temperature range
Storage temperature
Note:
Symbol
V
CC
V
P
V
ACC
I
RES
P
T
Topr
Tstg
HA16117FPA/FPB/FPC
–0.3 to +14
V
CC
14
10
300
–30 to +85
–55 to +125
HA16117FPAJ/FPBJ/FPCJ
–0.3 to +14
V
CC
14
10
300
–40 to +85
–55 to +125
Unit
V
V
V
mA
mW
°C
°C
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
Permissible dissipation P
T
(mW)
0.8 mm ceramic or
1.5 mm epoxy
400
300
200
100
85°C
0
−30 −20
0 20 40 60 80 100
Ambient operating temperature range Ta (°C)
83°C
−7.14
mW/°C
(30% wiring density)
4
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