CS8190 - Precision Air-Core Tach/Speedo Driver with Return ...

1 Semiconductor Components Industries, LLC, 2012 September, 2017 Rev. 81 Publication Order Number: CS8190 /D CS8190 Precision Air-CoreTach/ speedo Driver withReturn to ZeroThe CS8190 is specifically designed for use with air core metermovements. The IC provides all the functions necessary for an analogtachometer or speedometer. The CS8190 takes a speed sensor inputand generates sine and cosine related output signals to differentiallydrive an air core enhancements have been added over industry standardtachometer drivers such as the CS289 or LM1819.

2 The output utilizesdifferential drivers which eliminates the need for a zener referenceand offers more torque. The device withstands 60 V transients whichdecreases the protection circuitry required. The device is also moreprecise than existing devices allowing for fewer trims and for use in Direct Sensor Input High Output Torque Low Pointer Flutter High Input Impedance Overvoltage Protection Return to Zero Internally Fused Leads in PDIP 16 and SO 20W Packages These Devices are Pb Free, Halogen Free/BFR Free and are RoHSCompliantPDIP 16NF SUFFIXCASE 648161 BIASVCCSINE COS SINE+COS+GNDGNDGNDGNDVREGFREQINF/VOUTSQO UTCP CP+PIN CONNECTIONS ANDMARKING DIAGRAM116SO 20 WDWF SUFFIXCASE 751D120 SIN+COS+GNDGNDGNDGNDGNDGNDGNDGNDVREGFREQ INF/VOUTSQOUTCP CP+SIN COS BIASVCC120 PDIP 16SO 20WA= Assembly LocationWL= Wafer LotYY= YearWW = Work WeekG= Pb Free PackageCS 8190 AWLYYWWGCS8190 ENF16 AWLYYWWGSee detailed ordering and shipping information in the packagedimensions section on page 10 of this data +SQOUTFREQINCOS+Charge

3 PumpVoltageRegulatorSINE High VoltageProtectionVREGF/VOUTCP VREGGNDSINE+Figure 1. Block Diagram-+-+-+-+ VGNDGNDGND+--+ MAXIMUM RATINGSR atingValueUnitSupply Voltage, VCC< 100 ms Pulse TransientContinuous6024 VVOperating Temperature 40 to +105 CStorage Temperature 40 to +165 CJunction Temperature 40 to +150 CESD (Human Body Model) Temperature Soldering: Wave Solder (through hole styles only) (Note 1)Reflow: (SMD styles only) (Note 2)260 peak230 peak C CStresses exceeding those listed in the Maximum Ratings table may damage the device.

4 If any of these limits are exceeded, device functionalityshould not be assumed, damage may occur and reliability may be 10 seconds 60 second maximum above 183 CHARACTERISTICS ( 40 C TA 85 C, V VCC 15 V, unless otherwise specified.)CharacteristicTest ConditionsMinTypMaxUnitSUPPLY VOLTAGE SECTIONICC Supply CurrentVCC = 16 V, 40 C, No Load 50125mAVCC Normal Operation Range COMPARATOR SECTIONP ositive Input Threshold Hysteresis 200500 mVInput Bias Current (Note 3)0 V VIN V 10 80mAInput Frequency Range 0 20kHzInput Voltage Rangein series with kW VCCVO utput VSAT (SQOUT)ICC = 10 mA Leakage (SQOUT)

5 VCC = V 10mALow VCC Disable Threshold 0 Input Voltage VVOLTAGE REGULATOR SECTIONO utput Voltage Load Current 10mAOutput Load Regulation0 to 10 mA 1050mVOutput Line V VCC 16 V 20150mVPower Supply RejectionVCC = V, VP/P kHz3446 dBCHARGE PUMP SECTIONI nverting Input Voltage Bias Current 40150nAVBIAS Input Voltage Invert. Input VoltageIIN = mA (Note 4)@ 0, , 175, , + 350 Hz + Gain@ 350 Hz, CCP = mF, RT = 243 Gain, PositiveIIN = 15 Gain, NegativeIIN = 15 GENERATOR SECTION: 40 C TA 85 C, VCC = V unless otherwise notedReturn to Zero ThresholdTA = 25 Drive Voltage, (VCOS+ VCOS ) V VCC 16 V, q = 0 Drive Voltage, (VSIN+ VSIN ) V VCC 16 V, q = 90 Drive Voltage, (VCOS+ VCOS ) V VCC 16 V, q = 180 Drive Voltage, (VSIN+ VSIN ) V VCC 16 V, q = 270 Drive V VCC 16 V 3342mAZero Hertz Output Angle Input is clamped by an internal 12 V Applies to % of full scale (270 ).

6 CHARACTERISTICS ( 40 C TA 85 C, V VCC 15 V, unless otherwise specified.)CharacteristicTest ConditionsMinTypMaxUnitFUNCTION GENERATOR SECTION: 40 C TA 85 C, VCC = V unless otherwise noted (continued)Function Generator Error (Note 5)Reference Figures 2, 3, 4, 5 VCC = Vq = 0 to 305 + Generator V VCC 16 V + Generator V VCC 11 V + Generator V VCC V + Generator Error25 C TA 80 C + Generator Error25 C TA 105 C + Generator Error 40 C TA 25 C + Generator GainTA = 25 C, q vs F/VOUT607795 /V5.

7 Deviation from nominal per Table 1 after calibration at 0 and 270 .PIN FUNCTION DESCRIPTION PACKAGE PIN #PIN SYMBOLFUNCTIONPDIP 16SO 20W11CP+Positive input to charge square wave output or RPM input , 5, 12, 134 7, 14 17 GNDG round +Positive cosine output Negative cosine output or battery supply point or zero Negative sine output +Positive sine output regulator voltage proportional to input signal Negative input to charge PERFORMANCE CHARACTERISTICSF igure 2. Function Generator Output Voltage of DeflectionFigure 3.

8 Charge Pump Output Voltage Angle04590135180225270315045901351802252 70315 7 6 5 4 3 2 10123456701234567F/V Output (V)Frequency/Output Angle ( )Output Voltage (V)Degrees of Deflection ( )Deviation ( )Theoretical Angle ( ) V V VqAngle(VCOS+) (VCOS )(VSINE+) (VSINE )Q+ARCTAN VSIN)*VSIN*VCOS)*VCOS* Figure 4. Output Angle in Polar FormFigure 5. Nominal Output Deviation04590135180270315225 6. Nominal Angle vs. Ideal Angle (After Calibrating at 180 )Nominal Angle (Degrees)Ideal Angle (Degrees)0510202530354015451591317334129 21253745 Ideal DegreesNominal DegreesF VOUT+ V) FREQ CCP RT (VREG* V) 1.

9 Function Generator Output Nominal Angle vs. Ideal Angle (After Calibrating at 270 )Ideal qDegreesNominalqDegreesIdeal qDegreesNominalqDegreesIdeal qDegreesNominalqDegreesIdeal qDegreesNominalqDegreesIdeal qDegreesNominalqDegreesIdeal : Temperature, voltage and nonlinearity not DESCRIPTION and APPLICATION NOTESThe CS8190 is specifically designed for use with air coremeter movements. It includes an input comparator forsensing an input signal from an ignition pulse or speedsensor, a charge pump for frequency to voltage conversion,a bandgap voltage regulator for stable operation, and afunction generator with sine and cosine amplifiers todifferentially drive the meter the partial schematic of Figure 7, the input signal isapplied to the FREQIN lead.

10 This is the input to a highimpedance comparator with a typical positive inputthreshold of V and typical hysteresis of V. The outputof the comparator, SQOUT, is applied to the charge pumpinput CP+ through an external capacitor CCP. When theinput signal changes state, CCP is charged or dischargedthrough R3 and R4. The charge accumulated on CCP ismirrored to C4 by the Norton Amplifier circuit comprisingof Q1, Q2 and Q3. The charge pump output voltage, F/VOUT,ranges from V to V depending on the input signalfrequency and the gain of the charge pump according to theformula:F VOUT+ V) FREQ CCP RT (VREG* V)RT is a potentiometer used to adjust the gain of the F/Voutput stage and give the correct meter deflection.