M62055FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC
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M62055FP Datasheet PDF : 6 Pages
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FUNCTIONAL DESCRIPTION
VO+VCE(sat)
MITSUBISHI<Dig./Ana.INTERFACE>
M62055FP
3V POWER SUPPLY with WATCHDOG TIMER
Tick deactivation
Vcc
0
VTH1(H)
Vo
0
VTH2(H)
TC VTH2(L)
0
output cutoff output cutoff
VTH1(L)
=..0.9V =..0.9V
RESET
0
TRST(1)
TWD
TRST(2)
WD
0
13
2
46
5
79
8
1 : When Vo rises to 0.5 V, RESET becomes
low. Then, charging to a capacitor C
connected to TC will be started at the Vo
of 2.82V(VTH1(H)).
2 : When VCC rises to 3V+VCE(sat), Vo
becomes stable.
3 4 : When TC voltage rises to 1V(VTH2(L)) ,
RESET becomes high. When it rises to
2.4V (VTH2(H)) further, the capacitor C is
switched to discharge and RESET
becomes low.
5 : At the same time of a change-over to the
discharge from the capacitor C, Vo is
intercepted.
Then,TC will be discharged completely at
Vo of 2.72V(VTH1 (L)).
6 : Vo returns to 3V right after it has fallen
down to 0.9 V.
RESET repeats above operation till a
normal clock signal is input to WD pin.
10
11
12
13
14
7 8 : In the case of a sudden power interruption, Vo
9
falls down according to a decrease of VCC.
When it falls down to 2.72V, the capacitor C is
discharged and RESET will be low.
In the case of a reversion from the power
interruption, Vo rises according to a increase of
VCC. When it rises to 2.82V, the charging to the
capacitor C is started and RESET will be high
right after TC voltage reaches 1V.
10 11 : In the case a clock signal for discharging the
capacitor C is applied to pin WD before TC
voltage reaches to 2.4V, a reset signal to
RESET is canceled.
12 13 : In the case an abnormal clock signal is input,
TC repeats charging / discharging alternately
between 1 V and 2.4 V, so that RESET also
repeats high / low till a normal clock signal is
input.
14 : When Vo falls down to 2.72 V, RESET becomes
Low.
MITSUBISHI
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