MC33187 [MOTOROLA]

Long Duration Automotive Timer; 持续时间长汽车计时器


型号：	MC33187
厂家：	MOTOROLA
描述：	Long Duration Automotive Timer 持续时间长汽车计时器
文件：	总7页 (文件大小：326K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Order Number: MC33187/D

Rev. 4, 06/2001

Freescale Semiconductor, Inc.

Semiconductor Technical Data

MOTOROLA

MC33187

Advance Information

LONG DURATION AUTO-

MOTIVE TIMER

Long Duration Automotive Timer

This circuit is a Long Duration Automotive Timer primarily designed

as a deffoger timer, but as it is realised using a digital divider

techniques and it is suitable for a variety of long duration timing

functions. The circuit is available in an 8 pin surface plastic package.

SEMICONDUCTOR

TECHNICAL DATA

• Operating Ambient Temperature from -40°C to 85°C

• Operating Voltage Range from 5V to 18V

• 400mA Output Current Capability

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO-8)

• Integrated Input Debounce Circuitry

• Few External Components

PIN CONNECTIONS

• Toggle Input for Timing Start and Stop

Gnd

N/C

Vcc3

Relay

Toggle

ORDERING INFORMATION

Operating

Temperature Range

Device

Package

SO8

MC33187D

-40°C to +85°C

Block Diagram and Typical Application

Vbat

R - C

Vbat

6.8 Hz

13^Q

_Q14

Relay

VCC

Debounce Timer

Out

Timing

Toggle

2.3V

This document contains information on a new product. Specifications and information herein are

subject to change without notice.

For More Information On This Product,

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Freescale S^Me^Cm³³i¹c⁸o⁷nductor, Inc.

MAXIMUM RATINGS

Ratings

Symbol

Value

Unit

ELECTRICAL RATINGS

Pin 5 voltage

Vpin5

Vpin3

Ipin3

Pin 3 Voltage

Pin 3 Current

400

THERMAL RATINGS

Storage Temperature

Operating Junction Temperature

Tstg

-55 to +175

-40 to +150

°C

ELECTRICAL CHARACTERISTICS. Tamb from - 40°C to + 85°C, Vcc = 14V through 1KΩ, unless otherwise noted. Typical values reflect approximate

mean at 25°C, nominal VCC, at time of device characterization.

Parameters

Symbol

Min

Typ

Max

Unit

RC PIN 1

Oscillator Frequency

300

400

Vbat = 14V trough 1KΩ

Internal Counter Divider step

VR1

4096

RELAY PIN 3

Output Leakage current @ Vpin3

= 28V / Vbat =14V

IO1

IO2

100

Output Leakage current @ Vpin3

= 22V / Vbat = 0V

Output Saturation Voltage @

250mA / Vbat = 14V

VO1

VO2

1.35

2.60

Output Saturation Voltage @

400mA

TOGGLE PIN 4

Toggle Input Clamp @ Vbat =

14V / Vpin8 = 14V through 9.1KΩ

TCLP

6.0

1.0

9.0

4.0

Toggle Threshold

VCC3 PIN 5

VTG-T

Supply Current @ Vcc = 5V

ICC

0.5

6.0

3.5

8.0

VCC Zener Regulation @ Vbat =

14V through 1K

VCC

TS PIN 8

Time Select Current @ TS = 5V

ITS

200

MC33187

MOTOROLA

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MC33187

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DEVICE DESCRIPTION

Pin 4 : TOGGLE

Pin 1 : RC

Oscillator frequency control. Rt and Ct control the

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.

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.

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.

Formula : T = 4.1 10e-3 (RT * (RT/150)*2.7) *CT.

Pin 2 : GND

Ground : Most negative supply terminal.

Recommended values of Rs and Cs on a standard 12V

vehicle system are Rs = 1KOhm and Cs = 100nF.

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.

APPLICATION

This is the standard operation of this circuit requiring the

minimum of extra components.

the relay drive output transistor against relay turn-off and

supply lines transients.

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 = 10KΩ. The relay is intended

to be a standard automotive relay (Rnom = 60Ω) with contacts

rated appropriately for the defogger controlled. Dz with a

nominal value of 16V +-5% is included to provide protection of

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

Batt

GND

Relay

N / C

Batt

Rear

Defogger

Resistor

Toggle

Vcc

Rin

Batt

MC33187

MOTOROLA

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The circuit shown demonstrates the use of the timer to

As soon as the last switch is opened, the energy stored in

the relay coil causes the common connection of the switches

to rise to the voltage permitted by the clamp consisting of Dz

(approximately 16V).

This provides a toggle input via Rin, causing the relay

output of the integrated circuit to go low, thus keeping the

relay energised for the period preset, with the direct

connection to Rin ensuring that any switch bounce or noise

during this period cannot cause toggle input to be detected.

Retriggering at the end of the timing period is prevented by

the built in the debounce timer.

provide a delay in turning the courtesy light off after the

vehicle doors are closed. The components are the same as

the defogger timer and Rt, Ct, Rs and Cs are as described in

the general description above, while Dz and Rin are

described in the description of the defogger timer. S1 to Sn

represent the doors switches which can be basically the

same as for a conventional system, except that only the relay

coil current and not the full lamp current passes through

them.

The operation of the circuit is as follows :

While one of the door switches is closed, the courtesy

light is on with the relay current flowing through the switch.

Figure 2. Courtesy Light Timer Operation

Batt

GND

Relay

N / C

Batt

Rin

Toggle

Vcc

MC33187

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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

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 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

The control switch S1 needs to be a normally closed

momentary type.

by releasing the button.

Recommended values :

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.

Rs = 1KΩ

Cs = 100nF

Rt = 220KΩ

Ct = 10nF

Rin = 100KΩ

R1 = 1KΩ

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

Batt

GND

Relay

N / C

Batt

Toggle

Vcc

Rin

MC33187

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MC33187

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Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability

of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all

liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do

vary in different applications and actual performance may vary over time. All operating parameters, including “Typical” must be validated for each customer application by

customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for

use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any application in which the failure of the

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are registered trademarks of Motorola, Inc. Motorola, Inc. is

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P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447

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Technical Information Center: 1-800-521-6274

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2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.

852-26668334

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MC33187/D

MC33187 [MOTOROLA]

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