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