MOTOROLA MC33187 User Manual

MOTOROLA

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Semiconductor Technical Data

Advance Information

Order Number: MC33187/D

Rev. 4, 06/2001

MC33187

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.

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

• Operating Voltage Range from 5V to 18V

• 400mA Output Current Capability

• Integrated Input Debounce Circuitry

• Few External Components

• Toggle Input for Timing Start and Stop

LONG DURATION AUTO-

MOTIVE TIMER

SEMICONDUCTOR

TECHNICAL DATA

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO-8)

PIN CONNECTIONS

1

RC

2

Gnd

3

Relay

4

Toggle

ORDERING INFORMATION

Device

MC33187D

Operating

Temperature Range

TS

8

N/C

7

N/C

6

Vcc3

5

Package

SO8-40°C to +85°C

Block Diagram and Typical Application

Vbat

Q

C

Q

Q

C

C

12

Dz

Relay

R - C

1

3

Q

6.8 Hz

Q

C

Q

1

S

Q Q

D

Q

14

Q

R

Q

C

Q

C

S

C

S

J

Debounce Timer

Out

2

This document contains information on a new product. Specifications and information herein are
subject to change without notice.

© Motorola, Inc., 2001. All rights reserved.

Timing

In

R

Vbat

Q

S

Q

S1

13

TS

R

R

I

-

+

5

-

+

2.3V

8

5

VCC

4

Toggle

TM

MC33187

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MAXIMUM RATINGS

Ratings Symbol Value Unit

ELECTRICAL RATINGS

Pin 5 voltage Vpin5 18 V

Pin 3 Voltage Vpin3 18 V

Pin 3 Current Ipin3 400 mA

THERMAL RATINGS

Storage Temperature Tstg -55 to +175 °C

Operating Junction Temperature Tj -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

fo 300 400 Hz

Vbat = 14V trough 1KΩ

Internal Counter Divider step VR1 4096

RELAY PIN 3

Output Leakage current @ Vpin3

IO1 100 uA

= 28V / Vbat =14V

Output Leakage current @ Vpin3

IO2 100 uA

= 22V / Vbat = 0V

Output Saturation Voltage @

VO1 1.35 V

250mA / Vbat = 14V

Output Saturation Voltage @

VO2 2.60 V

400mA

TOGGLE PIN 4

Toggle Input Clamp @ Vbat =

TCLP 6.0 9.0 V

14V / Vpin8 = 14V through 9.1KΩ

Toggle Threshold VTG-T 1.0 4.0 V

VCC3 PIN 5

Supply Current @ Vcc = 5V ICC 0.5 3.5 mA

VCC Zener Regulation @ Vbat =

VCC 6.0 8.0 V

14V through 1K

TS PIN 8

Time Select Current @ TS = 5V ITS 25 200 uA

MC33187 MOTOROLA 2

MC33187

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DEVICE DESCRIPTION

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.

APPLICATION

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 = 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

Figure 1. .Defogger Timer Operation

Ct

Batt

Rt

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.

Cs

RC

GND

Relay

TS

N / C

N / C

Batt

Rear

Defogger

Resistor

Dz

Rin

Toggle

S1

Vcc

Batt

MC33187 MOTOROLA 3

Rs

MC33187

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The circuit shown demonstrates the use of the timer to
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

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.

S1

Sn

Batt

Ct

Rin

Dz

Rt

RC

GND

Relay

Toggle

TS

N / C

N / C

Vcc

Cs

Batt

Rs

MC33187 MOTOROLA 4

MC33187

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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.

Figure 3. Relay Drive and Latch (No Timeout

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 = 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).

D1

Dz

Ct

Batt

C1

Rin

Rt

S1

RC

GND

Relay

Toggle

N / C

N / C

R1

Cs

TS

Batt

Rs

Vcc

MC33187 MOTOROLA 5

MC33187 MOTOROLA 6

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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

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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. “Ty pica l” 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 “Typi cal ” 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
Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized
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expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or un authorized use, even if

such claim alleges that Motorola was negligent regarding the design or manufacture of the parts. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is

an Equal Employment Opportunity/Affirmative Action Employer.

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MC33187/D

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