參數(shù)資料
型號(hào)： HA16103FPK
廠商： Hitachi,Ltd.
英文描述： Watchdog Timer
中文描述： 看門狗定時(shí)器
文件頁(yè)數(shù)： 7/21頁(yè)
文件大?。?/td> 106K
代理商： HA16103FPK
HA16103 FPJ/FPK
7
Watchdog Timer Function
The system contains a bandpass filter for pulse width detection, which outputs a reset pulse when input
pulses are not at the preselected frequency (at either a higher or lower frequency).
The RC characteristic of the bandpass filter may be set with external components Rf and Cf. Equation 3
specifies how to determine the minimum pulse width (tmin) for runaway detection of the bandpass filter,
and figure 4 shows the characteristic of the filter.
HA16103
Rf
Cf
tmin = Cf x Rf x 0.11 (s)
Equation 3
Rf :
2.0 m
1.8 m
1.6 m
1.4 m
1.2 m
1.0 m
0.8 m
0.6 m
0.4 m
0.2 m
Resistance Rf (
)
Cf = 0.022
μ
F
Cf = 0.01
μ
F
Cf = 0.0047
μ
F
100 k
500 k
R
200 k
(Ta = 25
°
C)
P—Run pulse duty ratio 50% (fixed)
V = 12 V
C = 0.1 F
R = 180 k
Figure 4 Characteristic of Power-On Reset Circuit
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