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參數(shù)資料
| 型號： | M5295AL |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | WATCHDOG TIMER |
| 中文描述： | 看門狗定時器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 116K |
| 代理商： | M5295AL |
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5
ELECTRIC
MITSUBISHI
M5295AL/P/FP
MITSUBISHI<Dig.Ana.INTERFACE>
WATCHDOG TIMER
3.Relationship between Input Pulse
Width and Input Capacitance Cin
When input to pin 1 is 1.5V or more,TC pin
discharges electricity. Determine pulse width and
input capacitance Cin with reference to the diagram
shown on the right.
4.Vcc Detection Voltage Adjustment
(1)Detection voltage 1(V
TH
1)adjustment.
V
IN
Cin
1
30k
20k
Q1
Q1 is off when voltage at pin 1 is 1.5V or less.
t3=Cin5X10 In
1.5
Vin
RST1 is output when t4 is longer than t
WD
.
+
-
49.6k
20.4k
1.24V
4
3
6
5
R1
R2
R
L
Cin:10.000pF,t3=0.6ms
Cin:1000pF,t3=0.6μs
Cin:100pF,t3=6μs
When t3 is too long,TC pin output waveform frequency
changes as shown above.Set t3 to be sufficiently long
to turn on Q1[t
WDIN
(3μs)or more] but not to exceed
t2(Discharge time).
(t2:Discharge time during normal input)
VTH1(V) R1(k
)
13
10
7
5
4.25
4
3.5
R2(k
)
Detection voltage calculation formula
10
10
10
10
10.90
8.59
0.92
1.25
1.96
3.17
5
5
V
TH
1=
R02
R01+R02
X1.24(V)
R
01
=R1//49.6k
R
02
=R2//20.4k
To adjust detection voltage 1,determine external resistance
with the following equation:
a. V
TH
>4.25V(R1=10k
)
b. V
TH
1<4.25V(R2=5k
)
R2=
R0
1
-
20.4k
1
1
R1=
R0
1
-
49.6k
1
1
R0=
V
TH
1-1.24
8.322kX1.24
R0=
1.24
(V
TH
1-1.24)4.016k
Vin
V
IN
Vin
WD
1
TC
2
RST1
3
1.5V
t3
t
WD
4V
2V
t
t
t
t
t4
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