參數(shù)資料
型號: HA16117FB
廠商: Hitachi,Ltd.
英文描述: CMOS Watchdog Timer
中文描述: 看門狗定時器的CMOS
文件頁數(shù): 17/31頁
文件大小: 249K
代理商: HA16117FB
HA16117F Series
17
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
SW
C
F
0.01
μ
F
R
510 k
R
750 k
C
R
0.1
μ
F
Battery
Microprocessor
system
PORT
RES
5 V
regulator
V
CC
V
CC
Tadj
P-RUN
HA16117F
ACC
C
F
GND
C
R
GND
RES
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