IL33197 datasheet(3/5 Pages) INTEGRAL

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IL33197

TYPICAL APPLICATION

This application shows the IL33197A with the external wirings and two speed wiper motor. This

application has the Intermittent and Wash Wiper functions.

INTRODUCTION

The IL33197A 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 IL33197A is designed to directly drive a wiper motor relay. The IL33197A is suitable for both front

and rear wiper applications. The IL33197A connects directly to the vehicle’s battery voltage (Vbat) through

a 220

Ω resistor used with a 47µF 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 IL33197A 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 IL33197A 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.

In this configuration, the circuit will respond to the switching of INT to either Vbb or ground after a time

T1 (see T1 Debounce Timing). If INT is disconnected before the end of T1; no action will be taken. After a

time T1, the output will be switched on for a duration, T3 = 16 x 4 x tb1 and then switched off for a

duration, T4 = 144 x 4 x tb2. This sequence will continue to repeat so long as INT is disconnected from Vbb

IL33197 Datasheet(PDF) 3 Page - Integral Corp.