TECHNICAL DATA
January, 2011, Ver.01
Automotive Wash Wiper Timer
The IL33197A is a standard wiper timer control device designed for harsh
automotive applications. The device can perform the intermittent, after
wash, and continuous wiper timer functions. It is designed to directly drive
a wiper motor relay. The IL33197A requires very few external
components for full system implementation. The intermittent control pin
can be switched to ground or Vbat to meet a large variety of possible
applications. The intermittent timing can be fixed or adjustable via an
external resistor. The IL33197A is built using bipolar technology and
parametrically specified over the automotive ambient temperature range
and 8.0 to 16 V supply voltage. The IL33197A can operate in both front
and rear wiper applications.
• Adjustable Time Interval of Less Than 500 ms to More Than 30 s
• Intermittent Control Pin Can Be Switched to Ground or Vbat
• Adjustable After Wipe Time
• Priority to Continuous Wipe
• Minimum Number of Timing Components
• Integrated Relay Driver With Free Wheeling Protection Diode
• Operating Voltage Range From 8.0 to 16 V
• For Front Wiper and Rear Wiper Window Applications
* Stresses beyond those listed under “absolute maximum ratings” may
cause permanent damage to the device.
These are stress ratings only and functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods
may affect device reliability.
IL33197A
ORDERING INFORMATION
IL33197AN DIP
IL33197AN-01 DIP
IL33197AD SOIC
IL33197AD-01 SOIC
T
A
= -45 to 105C (SOIC)
T
A
= -45 to 125C (DIP)
IL33197A
January, 2011, Ver.01
Representative Block Diagram
This device contains 390 active transistors.
ELECTRICAL CHARACTERISTICS (–45°C 3 T
A
+125°C, 8.0 V VCC 16 V, unless otherwise noted. Typical
values reflect approximate mean at TA = 25°C with VCC = 14 V at the time of initial device characterization.)
NOTES: 1. The oscillator frequency is defined by the current flowing through the external resistor R2. The voltage at the INT pin is
(VCC/2 – Vbe) and hence the current flowing through R3 is different if R3 is connected to Vbb or to Gnd because of the
voltage drop across resistor R1. This voltage drop causes the oscillator coefficient for t
b2
to be different for the two cases of
INT terminated to Gnd or to Vbb. Because of this, the oscillator coefficient is specified with a specific value of R1
whenever INT is connected to Vbb. If R1 is changed, the coefficient will change. Also, any extra current through the
resistor R1 other than the current used by the device will cause timing deviations in t
b2
timings (as in the case where two
devices are sharing a common R1 resistor).
2. The oscillator stability with temperature is dependent on the temperature coefficients of the external components. If the
capacitance value of the external capacitor varies more than 5% over the parametric temperature range, the figures quoted
for oscillator variation are not valid.
3. The t
b1
duration is given by coefficient 4 x R2 x C2 (t
b1
duration = t
b1
x 4 x R2 x C2).
4. The t
b2
duration is given by coefficient x R3 x C2 (t
b2
duration = t
b2
x R3 x C2).