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UAA1041B Automotive Direction Indicator
This device was designed for use in conjunction with a relay in automotive applications. It is also applicable for other warning lamps such as "handbrake ON," etc.
AUTOMOTIVE DIRECTION INDICATOR
SEMICONDUCTOR TECHNICAL DATA
* * * * *
Defective Lamp Detection Overvoltage Protection Short Circuit Detection and Relay Shutdown to Prevent Risk of Fire Reverse Battery Connection Protection Integrated Suppression Clamp Diode
8 1
NO SUFFIX PLASTIC PACKAGE CASE 626
Figure 1. Typical Automotive System
C2 -VCC 1 2 UAA1041 C1 + 3 4 R1 R3 Relay -VCC +Vbat RLY Out S1 L1 L R Oscillator
1 2 3 4
8 1
8 7
RS
+V
D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8)
-V 6 5 R2
PIN CONNECTIONS
8 7 6 5
Start Fault Det Fault Det On/Off Oscillator
(Top View)
S2 L2 L3
L6 L4 L5
L1: 1.2 W, warning light handbrake ON L2, L3, L4, L5: 21 W, turn signals R1 = 75 k R2 = 3.3 k R3 = 220 RS = 30 m C1 = 5.6 F C2 = 0.047 F Device
ORDERING INFORMATION
Operating Temperature Range TA = - 40 to +100C Package SO-8 Plastic DIP
Rev 0
UAA1041BD UAA1041B
(c) Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1
UAA1041B
MAXIMUM RATINGS
Rating Current: Continuous/Pulse* Pin 1 2 3 8 Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Thermal Resistance, Junction-to-Ambient TJ TA Tstg RJA Value +150/+500 -35/-500 350/1900 300/1400 25/50 150 -40 to + 100 -65 to + 150 100 Unit mA
C C C C/W (Typ)
* One pulse with an exponential decay and with a time constant of 500 ms.
ELECTRICAL CHARACTERISTICS (T1 = 25C)
Characteristics Battery Voltage Range (normal operation) Overvoltage Detector Threshold Clamping Voltage Short Circuit Detector Threshold Output Voltage (Irelay = -250 mA) Starter Resistance Rst = R2 + RLamp Oscillator Constant (normal operation) Temperature Coefficient of Kn Duty Cycle (normal operation) Oscillator Constant - (1 lamp defect of 21 W) Duty Cycle (1 lamp defect of 21 W) Oscillator Constant (VPin2-VPin1) (VPin2-VPin1) (VPin2-VPin7) (VPin2-VPin3) Symbol VB Dth(OV) VIK Dth(SC) VO Rst Kn Kn - KF - K1 K2 K3 ICC - -2.5 - - - - - VPin2-VPin7 VPin2-VPin7 VPin2-VPin7 - 79 - -3.8 -5.6 -6.9 68 85.3 100 - - - - 91 - mV -0.9 -1.6 -2.2 - -1.0 - mA Min 8.0 19 29 0.63 - - 1.4 - 45 0.63 35 0.167 0.25 0.126 Typ - 20.2 31.5 0.7 - - 1.5 -1.5x10-3 50 0.68 40 0.18 0.27 0.13 Max 18 21.5 34 0.77 1.5 3.6 1.6 - 55 0.73 45 0.193 0.29 0.14 Unit V V V V V k{ - 1/C % - % -
Current Consumption (relay off) Pin 1; at VPin2 - VPin1 = 8.0 V Pin 1; at VPin2 - VPin1 = 13.5 V Pin 1; at VPin2 - VPin1 = 18 V Current Consumption (relay on) Pin 1; at VPin2 - VPin1 = 8.0 V Pin 1; at VPin2 - VPin1 = 13.5 V Pin 1; at VPin2 - VPin1 = 18 V Defect Lamp Detector Threshold at VPin2 to VB = 8.0 V and R3 = 220 = 13.5 V = 18 V
mA
{ See Note 1 of Application Information
2
MOTOROLA ANALOG IC DEVICE DATA
UAA1041B
CIRCUIT DESCRIPTION
The circuit is designed to drive the direction indicator flasher relay. Figure 2 shows the typical system configuration with the external components. It consists of a network (R1, C1) to determine the oscillator frequency, shunt resistor (RS) to detect defective bulbs and short circuits in the system, and two current limiting resistors (R2/R3) to protect the IC against load dump transients. The circuit can be used either with or without short circuit detection, and features overvoltage, defective lamp and short circuit detection. The lightbulbs L2, L3, L4, L5 are the turn signal indicators with the dashboard-light L6. When switch S1 is closed, after a time delay of t1 (in our example t1 = 75 ms), the relay will be actuated. The corresponding lightbulbs (L2, L3 or L4, L5) will flash at the oscillator frequency, independent of the battery voltage of 8.0 V to 18 V. The flashing cycle stops and the circuit is reset to the initial position when switch S1 is open. Overvoltage Detection Senses the battery voltage. When this voltage exceeds 20.2 V (this is the case when two batteries are connected in series), the relay will be turned off to protect the lightbulbs. Lightbulb Defect Detector Senses the current through the shunt resistor RS. When one of the lightbulbs is defective, the failure is indicated by doubling the flashing frequency. Short Circuit Detector Detects excessive current (Ish > 25 A) flowing in the shunt resistor RS. The detection takes place after a time delay of t3 (t3 = 55 ms). In this case, the relay will be turned off. The circuit is reset by switching S1 to the off position. Operation with Short Circuit Detection Pin 6 has to be left open and a capacitor C2 has to be connected between Pin 1 and Pin 2. Operation without Short Circuit Detection
L1
Pin 6 has to be connected to Pin 2, and the use of capacitor C2 is not necessary. The circuit can also be used for other warning flashers. In this example, when the handbrake is engaged, it is signaled by the light (L1). Figure 2. Typical System Configuration
C2 -VCC 1 2 UAA1041B C1 + 3 4 R1 R3 Relay 6 5 R2 JU-1 8 7 -V RS +V
S1 L R
L6 S2 L2 L3 L4 L5
PARTS LIST R1 = 75 k Relay-Coil Resistance R2 = 3.3 k Range 60 to 800 R3 = 220 RS = 30 m Note: Per text connect Wire Resistor jumper JU-1 bypass C1 = 5.6 F short circuit detector C2 = 0.047 F C2 may be deleted also.
APPLICATION INFORMATION
1. The flashing cycle is started by closing S1. The switch position is sensed across resistor R2 and RLamp by Input 8. Rst = R2 + RLamp. The condition for the start is: Rst < 3.6 k. For correct operation, leakage resistance from Pin 8 to ground must be greater than 5.6 k. 2. 1 Flashing frequency: fn = R1C1Kn 4. t1: delay at the moment when S1 is closed and first flash t1: t1 = K1R1C 5. t2: defective lightbulb detection delay t2 = K2R1C1 6. t3: short circuit detection delay t3 = K1R1C1 In the case of short circuit - it is assumed that the voltage (VPin2-VPin1) 8.0 V. The relay will be turned off after delay t3. The circuit is reset by switching S1 to the off position. The capacitor C2 is not obligatory when the short circuit 7. detector is not used. In this case Pin 6 has to be connected to Pin 2. When overvoltage is sensed (VPin2 - VPin1) the relay is 8. turned off to protect the relay and the lightbulbs against excessive currents.
3. Flashing frequency in the case of one defective lightbulb of 21 W: 1 fF = Kn = 2,2KF R1C1KF
MOTOROLA ANALOG IC DEVICE DATA
3
UAA1041B
OUTLINE DIMENSIONS
8 5
PLASTIC PACKAGE CASE 626-05 ISSUE K -B-
1
4
NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --- 10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --- 10_ 0.030 0.040
F
NOTE 2
-A- L
C -T-
SEATING PLANE
J N D K
M
M
H
G 0.13 (0.005) -A-
8 5
TA
M
B
M NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A B C D F G J K M P R MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.18 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.007 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
-B-
1 4
4X
P 0.25 (0.010)
M
D SUFFIX PLASTIC PACKAGE CASE 751-05 (SO-8) ISSUE N B
M
G C -T-
8X SEATING PLANE
R
X 45 _
F
D 0.25 (0.010)
M
K TB
M_
S
J
S
A
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4
*UAA1041B/D*
MOTOROLA ANALOG IC DEVICE DATA UAA1041B/D

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