MC33187D View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC33187D Datasheet PDF : 7 Pages
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Freescale SMeCm33i1c8o7 nductor, Inc.
This circuit is designed to just use the toggle and relay
If the switch is held operated for 9 seconds, with the
drive feature of the long duration timer.
values recommended below, after it has been used to switch
The functions of components Rs, Cs, Rt, Ct, Rin and Dz the relay on the circuit will time out and the relay switch off.
are as previously described. Although the circuit is not No further action takes place until the circuit is reset by
intended to be allowed to time out, Rt and Ct need to be releasing the button.
included as it is necessary for the timer to run for the internal
If the switch is held operated after it has been used to
debounce timer to be reset.
switch the relay off, nothing happens until the circuit is reset
The control switch S1 needs to be a normally closed by releasing the button.
momentary type.
Recommended values :
While it is closed, D1 ensures that the oscillator does not
Rs = 1KΩ
run, while R1 ensures that D1 is reverse biassed when the
Cs = 100nF
switch is operated (open). C1 is included to provide a time
Rt = 220KΩ
constant RinC1 to delay the detection of a toggle input.
Ct = 10nF
Thus the operation of the circuit is as follows :
Rin = 100KΩ
When S1 is operated, the oscillator is allowed to start ; the
R1 = 1KΩ
toggle input is then recognised and the relay output changes
C1 = 220nF
state assuming that the switch has been released, the
Dz = MZD16
oscillator is stopped and the sequence above can be
D1 = 1N4148
repeated.
Note that the time constant RtCt and RinC1 are related
(start up time and basic frequency of oscillator/switch to
toggle delay time) and need to stay in the ratio (1:10).
Figure 3. Relay Drive and Latch (No Timeout
Ct
Rt
Cs
D1
Batt
RC
GND
TS
N/C
Relay
N/C
Batt
Dz
C1
Rs
Toggle
Vcc
Rin
S1
R1
MC33187
For More InfoMrOmTaOtRioOnLAOn This Product,
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