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Número de pieza
componentes Descripción
HA16117 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics
Número de pieza
componentes Descripción
Fabricante
HA16117
CMOS Watchdog Timer
Hitachi -> Renesas Electronics
HA16117 Datasheet PDF : 31 Pages
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HA16117F Series
Selection of External Constants
If the reset duration necessary for the MPU to operate reliably at power-on is known, there is a simple
procedure for selecting external constants, starting from the power-on reset time (t
ON
).
START
Set power-on
reset time t
ON
Set reset high
time t
RH
Select external
constant C
F
Check watchdog
frequency range
f
H
and f
L
External
constant
values
•
Decide reset
low time (t
RL
)
•
Select external
constant C
R
•
Decide reset-clock
off time (t
OFF
)
•
Select external
constants R
1
and R
2
Figure 4 Procedure for Selecting External Constants
Application Example
Battery
SW
5V
regulator
C
F
0.01
µ
F
C
R
0.1
µ
F
V
CC
Tadj
P-RUN
ACC
HA16117F
C
F
GND
C
R
RES
R
1
510 k
Ω
R
2
750 k
Ω
V
CC
Microprocessor
system
RES PORT GND
17
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