MC33197D データシートの表示（PDF） - Motorola => Freescale

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MC33197D

Automotive Wash Wiper Timer

Motorola => Freescale 

MC33197

+ Battery Line

Figure 1. Intermittent Wash Wiper Typical Application

Vbb

Washer

Intermittent

Low Speed

High Speed

M

C1

R1

R3

VCC

INT

MC33197

R4

Out

W/W

Osc2 Osc1 Gnd

C2

R2

Wiper Motor

Low Speed

Wash Wipe

Switch

Water

M

Pump

High Speed

This application shows the MC33197 with the external wirings and two speed

wiper motor. This application has the Intermittent and Wash Wiper functions.

INTRODUCTION

The MC33197 is a wiper timer control device designed for

use in harsh automotive applications. The device can

perform the intermittent, after wash, and continuous wiper

timer functions.

The MC33197 is designed to directly drive a wiper motor

relay. The MC33197 is suitable for both front and rear wiper

applications. The MC33197 connects directly to the vehicle’s

battery voltage (Vbat) through a 220 Ω resistor used with a

47 µF de–coupling filter capacitor. The device has an internal

oscillator controlled by one of two external resistors (R2 and

R3) in addition to one external capacitor (C2), dependent on

the application function required. The values of C2 and R2

determine the tb1 time base. Tb1 is used to generate the relay

wiper activation during the INT function (T3) and the after

wash timing (T2) during the wash wipe mode. The values C2

and R3 determine the tb2 time base. The tb2 time base is

used to generate the pause or intermittent time (T4).

The intermittent wiper function can generate intermittent

timing (T4) from less than 500 ms to more than 30 seconds.

The intermittent function of the device can be activated by the

INT input connected to either ground or Vbat. The intermittent

timing is externally adjustable by changing the value of

resistor R3.

The wash wiper timer function detects the water pump

motor’s operation. When the pump motor activation is

detected, the MC33197 turns the wiper on for the entire

duration of the pump motor’s activation. When the motor is

turned off, it generates an after wash timing (T2) to maintain

the wiping action. The W/W pin is connected to the water

pump motor through a protection resistor (R4).

The MC33197 also has a continuous function, which

activates the wiper relay whenever the CONT input is

activated. The CONT input is connected to a switch through

a protection resistor (R5). The CONT input comparator has

an input threshold of Vbb/2 with hysteresis.

The device has internal debounce circuitry, based on the

oscillator period. This provides filtering of the intermittent

(INT) and wash wipe (W/W) input signals (see T1 Debounce

Timing paragraph that follows). The device directly drives the

wiper motor relay. It internally incorporates a 20 V free

wheeling zener diode to protect the device against

overvoltage spikes produced when relay is switched off.

Intermittent Operation

Conditions:

• W/W not connected or connected to ground.

• CONT not connected or connected to ground.

• INT connected to Vbb or to ground.

MOTOROLA ANALOG IC DEVICE DATA

3

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