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參數(shù)資料
| 型號： | MC33197P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | AUTOMOTIVE WASH WIPER TIMER |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 109K |
| 代理商： | MC33197P |
MC33197
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
Osc2
R4
Osc1
+ Battery Line
Water
Pump
Wiper Motor
Wash Wipe
Switch
Low Speed
High Speed
MC33197
Low Speed
High Speed
Intermittent
Washer
This application shows the MC33197 with the external wirings and two speed
wiper motor. This application has the Intermittent and Wash Wiper functions.
Vbb
CC
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
resistor used with a
47
μ
F 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
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.
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