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MC33197AD Datasheet(PDF) 3 Page - Motorola, Inc |
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MC33197AD Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 8 page MC33197A 3 MOTOROLA ANALOG IC DEVICE DATA Figure 1. Intermittent Wash Wiper Typical Application INT Out Gnd V C2 R2 R3 R1 C1 M M W/W R4 Osc2 Osc1 + Battery Line Water Pump Wiper Motor Wash Wipe Switch Low Speed High Speed MC33197A Low Speed High Speed Intermittent Washer This application shows the MC33197A with the external wirings and two speed wiper motor. This application has the Intermittent and Wash Wiper functions. V bb CC INTRODUCTION The MC33197A 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 MC33197A is designed to directly drive a wiper motor relay. The MC33197A is suitable for both front and rear wiper applications. The MC33197A 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 MC33197A 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 MC33197A 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. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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