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May 1999
T DUC ENT PRO LACEM 747 TE OLE REP 00-442-7 OBS ENDED -8 M ns 1 .com COM pplicatio @harris RE NO ntral A entapp Ce :c Call or email
CA3165
Electronic Switching Circuit
Features
* Switching Initiated by Damping of Internal Oscillator * Proximity Sensing of Rotational Motion
Description
The CA3165 is a single chip electronic switching circuit intended primarily for ignition applications. It includes an oscillator that is amplitude-modulated by the rotor teeth of a distributor, a detector that develops the positive going modulation envelope, a Schmitt trigger that eliminates switching uncertainties. Both types include two complementary high current switched outputs for driving power transistors requiring up to 120mA. The CA3165E also includes two complementary low current outputs that incorporate internal current limiting and a non-inverting output amplifier with uncommitted input capable of switching 27mA. The CA3165 is supplied in the 8 lead dual-in-line plastic package (E suffix) and in the 14 lead dual-in-line plastic package (E1 suffix).
[ /Title (CA3165) * Repeatable Timing of Switching States /Subject (Electronic Switching Circuit) * Five Outputs - Two Complementary Pairs and One /Author () Non-Inverting Output CA3165E1 /Keywords () * Two Outputs - One Complementary Pair CA3165E /Creator () /DOCINFO pdfmark Part Number Information
PART [ /PageMode /UseOutlines NUMBER TEMPERATURE /DOCVIEW pdfmark CA3165E CA3165E1 -40oC to +85oC -40oC to +85oC PACKAGE 8 Lead Plastic DIP 14 Lead Plastic DIP
Pinouts
CA3165 (PDIP) TOP VIEW CA3165 (PDIP) TOP VIEW
OSC FB SENSE GND OUTPUT
1 2 3 4
8 7 6 5
FB_RF V+ DET_OUT INV_OUT
OSC FB 1 SENSE 2 GND 3 OUTPUT 4 +SIGNAL 5 INV_OUT 6 -SIGNAL 7
14 NC 13 FB_RF 12 V+ 11 NC 10 DET_OUT 9 AMPL_IN 8 AMPL_OUT
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures. Copyright
(c) Harris Corporation 1999
File Number
1278.3
10-25
CA3165 Functional Block Diagrams
DC SUPPLY 5V - 24V 200 TO POWER TRANSISTORS NC 5 FEEDBACK RESISTOR (6k 0.5%) 13 OSCILLATOR 1 2 220 0.01 R 1500 pF REPRESENTS ROTOR LOADING DET SCHMITT TRIGGER OUTPUT SWITCHING 6 7 OUTPUT 8 AMP 9 4 OUTPUT 847 220 3.5V - 18V 0.01F 12
10
3 0.01F
6.8K
L = 100H Q 53
100K
0.0047F
OSCILLATOR CONDITION Unloaded Loaded
TERMINAL 10 Low High
TERMINAL 4 High Low
TERMINAL 5 High Low
TERMINAL 6 Low High
TERMINAL 7 Low High
TERMINAL 8 Low High
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM FOR CA3165E1
DC SUPPLY 5V - 24V 200 TO POWER TRANSISTORS
220 3.5V - 18V 0.1F 7 4 FEEDBACK RESISTOR (6.49k) 8 OSCILLATOR 1 2 220 0.01 RB 1500 pF DET SCHMITT TRIGGER
300
OUTPUT 5 SWITCHING
INVERTED OUTPUT
6
3
L = 100H Q 53
RA
REPRESENTS ROTOR LOADING VALUES OF RA AND RB DETERMINED BY CORRELATION.
OSCILLATOR CONDITION Unloaded Loaded
TERMINAL 4 High Low
TERMINAL 5 High Low
TERMINAL 6 Low High
FIGURE 2. FUNCTIONAL BLOCK DIAGRAM FOR CA3165E
10-26
Specifications CA3165
Absolute Maximum Ratings
DC Voltage (With Reference to Terminal 3) CA3165E1 Terminals 4, 6, 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V Terminals 5, 7, 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Terminal 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V CA3165E Terminals 4, 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V Terminal 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Current (At Terminals Indicated) CA3165E1 Terminals 4, 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120mA Terminals 5, 7 . . . . . . . . . . . . . . . . . . . . . . . . . -0.1mA to 0.1mA Terminal 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA CA3165E Terminals 4, 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120mA
Thermal Information
Thermal Resistance JA Plastic DIP Package 8 Lead . . . . . . . . . . . . . . . . . . . . . 150oC/W Plastic DIP Package 14 Lead . . . . . . . . . . . . . . . . . . . . 100oC/W Operating Temperature Range . . . . . . . . . . . . . . . . . -40oC to +85oC Storage Temperature Range. . . . . . . . . . . . . . . . . . -65oC to +150oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC At Distance 1/16" 1/32" (1.59 0.79mm) from Case for 10s Maximum Device Dissipation Plastic DIP Package 8 Lead Up to TA = +55oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW Above TA = +55oC . . . . . . . . . . . . . Derate Linearly at 6.67mW/oC Device Dissipation Plastic DIP Package 14 Lead Up to TA = +55oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 950mW Above TA = +55oC . . . . . . . . . . . . . . .Derate Linearly at 10mW/oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications
At TA = +25oC, V+ = 13V, Measured in the circuit of Figure 5 (CA3165E1) or Figure 6 (CA3165E) CA3165E1 CA3165E MAX 0.5 1 0.9 MIN 12.8 TYP 18.4 17.5 4.4 0.6 MAX 0.5 UNITS mA mA V V V V V Vp-p Vp-p
PARAMETERS Input Current at Term. (Note 1)
SYMBOL
TEST CONDITIONS Dwell Spark
MIN 12.8 1.2 -
TYP 18.4 17.5 4.4 0.6
Output Voltage at Term. 4
V4
Dwell Spark
Output Volatge at Term. 7 Output Voltage at Term. 8
V7 V8
Dwell Dwell Portion of Spark
Oscillator Voltage at Term. 2
V2
Dwell Spark
NOTE: 1. CA3165E at Term. 7 CA3165E1 at Term. 12
I7 I12
10-27
CA3165 Schematic Diagrams
ALL RESISTANCES ARE IN KILOHMS R1 0.18 Q1 R2 0.18 R3 0.18 Q2 R4 0.18 Q3 Q4 R7 6.2 R6 0.6 1 Q9 Q7 Q8 R10 0.35 Q10 R25 Q24 2.1 Q11 Q12 R11 2.9 R12 1.8 Q14 R13 2 R14 0.1 Q13 Q15 R16 2.5 R15 1 Q17 R29 0.05 R24 0.1 R30 0.1 Q28 R 31 2 R26 2.1 R32 5 Q29 R33 0.1 Q30 R28 2 Q26 8 Q37 R8 3.3 R9 3.3 R27 1.8 Q25 Q36 Q18 Q6 R5 0.18 Q5 R17 10 Q20 Q19 R22 2.4 Q22 Q23 Q34 R23 5.1 12 R18 10 R19 6.2 R20 4.3 Q21 R21 2.4 Q32 Q33 R37 4.5 9 R36 4.6 Q36
Q27
R34 2
R35 5 Q31 Q38
Q39
Q40
Q16
2
13
3
10
4
5
6
7
FIGURE 3. SCHEMATIC DIAGRAM FOR CA3165E1
ALL RESISTANCES ARE IN KILOHMS 7
R1 0.18 Q1
R2 0.18 Q2
R3 0.18 Q3 Q4
R5 R4 0.18 0.18 Q5 R17 10
R18 10
R19 10
R20 4.3
R22 2.4
R29 4.6 Q31
Q18 Q17 Q19 Q20 R23 5.1 Q29 Q30
Q33 R7 0.6 1 R6 6.2 R8 3.3 R9 3.3 Q8 Q6 Q7 R11 0.35 Q10 Q15
Q16 R21 2.4
R30 4.5
Q40
R24A 1.8
Q22
Q41
Q23 R25 2.1 R26 2.1
R24B 2 Q24
Q32
Q9 Q13 Q11 R12 1.8 R10 2.9 Q21 Q38 R13 2 R13A 0.1 Q12 R14 2.5
R16 0.1
R31 0.1
Q14 R15 1 Q39 R15A 0.05 Q25
R32 2 R27 5
R33 0.1
R34 2
R28 5 Q36 Q37
Q26 Q28
Q27 Q35
2
8
3
6
4
5
FIGURE 4. SCHEMATIC DIAGRAM FOR CA3165E
10-28
CA3165
Application Information
Figure 5 and Figure 6 show the application of the CA3165 in a typical ignition system. TERMINAL DESCRIPTIONS TERMINAL CA3165E1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 CA3165E 1 2 3 4 5 6 7 8 Oscillator Feedback Resistor, RF 220 Protective Resistor To Tank Circuit Ground Direct Output - R7 load resistor 200 5%, and R8 to power Darlington 15 10% Direct Output - Low Current - Not Connected Inverted High Current Output Inverted Low Current Output Through C1 (0.01F) to D3 and R3 (100k) Output Amplifier Output - Through R6 and R5 (27 and 820 to Supply) Output Amplifier Input - through R4 (6800) to D3 and C5 (0.0047F) Detector Output - C2 to Ground (0.01F) No Connection Circuit Supply Voltage Through R1 (220 Protective Resistor) to Automotive Supply Oscillator Feedback Resistor RF to Terminal 1 No Connection FUNCTION
AUTOMOTIVE SUPPLY 5V - 24V C1 0.01F R1 220 H.V. C2 0.01F R6 27 NC 14 H.V. RF CA3165E1 TOP VIEW R7 200 D2 C6 0.0047F 13 12 NC 11 10 9 8 R4 6.8k R5 820
1
2
3
4
5
6
7 D3 C5 0.0047 F R8 15
R2 220 L1 METALLIC TRIGGER WHEEL ONE TOOTH PER CYLINDER
NC NC C4 0.01F R3 100k
R9 6.8k D4
D1
R10 220
C3 1500pF
CURRENT LIMITER
1100
L1 SENSOR COIL INDUCTANCE 100H UNLOADED Q 53 EXCEPT AS NOTED, RESISTOR VALUES IN OHMS
R11
R12 100
R13 0.18
SET FOR 4 AMPERES IN R13
FIGURE 5. TYPICAL IGNITION SYSTEMS USING THE CA3165E1
10-29
CA3165
+13V R1 220 820 1W 5% 6 CA3165E TOP VIEW 5 4 3 2 R6 0.01F C6 C3 0.01F 6490 0.15% C2 1500pF SILVER MICA 1 220 VOUT 200 1W 5%
7 8
L1 SENSOR COIL, INDUCTANCE 100H, UNLOADED Q 53
L1
METALLIC TRIGGER WHEEL, ONE TOOTH PER CYLINDER
ALL RESISTORS 1/2 W 5% UNLESS OTHERWISE SPECIFIED RESISTOR VALUES IN OHMS
FIGURE 6. TYPICAL IGNITION SYSTEM USING THE CA3165E
Application Information
Figure 5 and Figure 6 show the application of the CA3165 in a typical ignition system. The oscillator on the chip operates at about 400kHz as determined by the tuned circuit L1, C2. The amplitude of the oscillation is detected on the chip and applied to a Schmitt trigger which sets the terminal voltage as shown in the chart in Figure 1 and Figure 2 for the unloaded condition of the oscillator. As a metallic tooth in the rotor passes the coil L1, eddy-current losses occur which reduce the Q of the resonant circuit and decrease the amplitude of the oscillations to a level below that of a reference in the detector circuit. The output terminals are then switched to states as shown in the chart in Figure 1 and Figure 2 for the loaded condition of the oscillator. The oscillation is maintained at this lower amplitude by switching in additional feedback in the oscillator circuit. The fact that the oscillator continues to operate at some minimum level during this dwell period eliminates timing variations which would occur if the oscillator had to be restarted by random noise. Spark occurs as terminal 4 is switched from high to low. The output amplifier clamps terminal 4 low through the regulator during the duration of the spark. The Dwell period represents the time that terminal 10 (CA3165E1) or terminal 6 (CA3165E) is high, terminal 4 is low, and the coil is charged. The value of the oscillator feedback, resistor, RF , is selected to set the dwell period. With a sintered-iron 8 f-tooth rotor, a typical value of RF is 6500 for 28.5 degrees of dwell out of a 45 degree cycle. For a star-type rotor and a particular coil in a typical distributor, the feedback resistor would be larger (typically 8800) depending on clearances, coil geometry and tooth shape. For typical F-Tooth Rotor with Rod Sensor and 113H of coil inductance, the Q and frequency with respect to rotor position was measured for the following positions CENTER 46 at 377kHz SLOT FIRE 6 at 390kHz 15 at 381kHz
(Free air Q = 55.7 at 375kHz.)
OSCILLATOR OSC LOADED DWELL PERIOD OSC UNLOADED
HIGH DETECTOR TERM 10 LOW HIGH TERM 4 LOW DWELL DWELL
COIL CHARGE SPARK
FIGURE 7. TIMING SEQUENCE
10-30

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