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參數資料
| 型號： | MC33187D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Long Duration Automotive Timer |
| 中文描述： | PULSE, 0.0004 MHz, TIMER, PDSO8 |
| 封裝： | PLASTIC, SO-8 |
| 文件頁數： | 5/7頁 |
| 文件大小： | 325K |
| 代理商： | MC33187D |
MC33187
MOTOROLA
5
MC33187
This circuit is designed to just use the toggle and relay
drive feature of the long duration timer.
The functions of components Rs, Cs, Rt, Ct, Rin and Dz
are as previously described. Although the circuit is not
intended to be allowed to time out, Rt and Ct need to be
included as it is necessary for the timer to run for the internal
debounce timer to be reset.
The control switch S1 needs to be a normally closed
momentary type.
While it is closed, D1 ensures that the oscillator does not
run, while R1 ensures that D1 is reverse biassed when the
switch is operated (open). C1 is included to provide a time
constant RinC1 to delay the detection of a toggle input.
Thus the operation of the circuit is as follows :
When S1 is operated, the oscillator is allowed to start ; the
toggle input is then recognised and the relay output changes
state assuming that the switch has been released, the
oscillator is stopped and the sequence above can be
repeated.
If the switch is held operated for 9 seconds, with the
values recommended below, after it has been used to switch
the relay on the circuit will time out and the relay switch off.
No further action takes place until the circuit is reset by
releasing the button.
If the switch is held operated after it has been used to
switch the relay off, nothing happens until the circuit is reset
by releasing the button.
Recommended values :
Rs = 1K
Cs = 100nF
Rt = 220K
Ct = 10nF
Rin = 100K
R1 = 1K
C1 = 220nF
Dz = MZD16
D1 = 1N4148
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
RC
GND
Relay
Toggle
Vcc
N / C
TS
N / C
Batt
Rs
Rt
Ct
Cs
Batt
C1
Rin
S1
R1
Dz
D1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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