M5295AL Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
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M5295AL Datasheet PDF : 8 Pages
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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.
VIN
30k
1
Q1
Cin
20k
Q1 is off when voltage at pin 1 is 1.5V or less.
t3=Cin•5X104 •In
Vin
1.5
RST1 is output when t4 is longer than tWD.
MITSUBISHI<Dig.Ana.INTERFACE>
M5295AL/P/FP
WATCHDOG TIMER
Vin
VIN
Vin
WD 1.5V
1
t3
t4
t
t
4V
TC
tWD
2V
t
2
RST1
3
t
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[tWDIN(3µs)or more] but not to exceed
t2(Discharge time).
(t2:Discharge time during normal input)
4.Vcc Detection Voltage Adjustment
(1)Detection voltage 1(VTH1)adjustment.
6
R1
49.6k
RL
5
+
-
3
R2
20.4k
1.24V
4
VTH1(V) R1(kΩ) R2(kΩ) Detection voltage calculation formula
13 10 0.92
10
10
1.25
VTH1= R01+R02
R02
X1.24(V)
7
10 1.96
5
10 3.17
4.25
R01=R1//49.6kΩ
R02=R2//20.4kΩ
4 10.90 5
3.5 8.59 5
To adjust detection voltage 1,determine external resistance
with the following equation:
a. VTH>4.25V(R1=10kΩ)
R2=
1
1
-
1
R0 20.4k
R0= 8.322kX1.24
VTH1-1.24
b. VTH1<4.25V(R2=5kΩ)
R1=
1
1
-
1
R0 49.6k
R0= (VTH1-1.24)4.016k
1.24
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