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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： | 3/7頁 |
| 文件大小： | 325K |
| 代理商： | MC33187D |
MC33187
3
MC33187
DEVICE DESCRIPTION
APPLICATION
Pin 1 : RC
Oscillator frequency control. Rt and Ct control the
frequency of the clock oscillator. The period of oscillation is
nominally given by t = RtCt with the overall time period given
by T = 4096 RtCt. However, the following formula is believed
to give a more accurate forecast of the overall time interval
provided by the circuit for values of Rt between 200K and 2M
and values of Ct between 1nF and 1uF.
Formula : T = 4.1 10e-3 (RT * (RT/150)*2.7) *CT.
Pin 2 : GND
Ground : Most negative supply terminal.
Pin 3 : RELAY
Relay output driver. Open collector drive from a Darlington
transistor rated. Icmax = 400mA and Vmax = 18V. The relay
driver output is on (low) during the time period.
Pin 4 : TOGGLE
On/Off Control. A positive going voltage transition on this
input toggles the timer between the On and Off state. If the
timer is On and timing, it may be turned off by a positive going
signal on the toggle pin before the time delay has elapsed.
Pin 5 : VCC
Positive supply terminal. The timer requires a supply
voltage of 5 to 18V applied to Vcc through Rs. An internal 7V
zener limits the Vcc terminal voltage. Cs is included to provide
supply rail decoupling.
Recommended values of Rs and Cs on a standard 12V
vehicle system are Rs = 1KOhm and Cs = 100nF.
This is the standard operation of this circuit requiring the
minimum of extra components.
The ON/OFF switch is a non-latching push button (or
similar), illuminated by a lamp in parallel with the rear window
defogger. Rin protects the toggle input from supply line
transients with a nominal of Rin = 10K
. The relay is intended
to be a standard automotive relay (Rnom = 60
) with contacts
rated appropriately for the defogger controlled. Dz with a
nominal value of 16V +-5% is included to provide protection of
the relay drive output transistor against relay turn-off and
supply lines transients.
The type of zener used is dependent of the level of
protection required. An MZD16 will provide adequate
protection for all relay turn-off and low energy supply
transients, while a P6KE16A will provide full protection against
all known transients. If the relay output is to be connected in
any other way or to a non-standard relay, the maximum ratings
quoted under the General Description above should be noted.
Figure 1.
.Defogger Timer Operation
RC
GND
Relay
Toggle
Vcc
N / C
TS
N / C
Batt
Rs
Rt
Ct
Cs
Batt
Dz
Rear
Defogger
Resistor
Rin
S1
Batt
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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