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CS8190EDWF20 Datasheet(PDF) 8 Page - ON Semiconductor |
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CS8190EDWF20 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page CS8190 http://onsemi.com 8 R3 R4 R2 C3 C1 D2 R1 D1 GND COSINE SINE C4 CCP RT + Speedo Input Battery Air Core Gauge 200 W CP+ CP− SQOUT F/VOUT VREG GND GND SINE+ SINE− BIAS FREQIN GND GND COS+ COS− VCC 1 Speedometer Trim Resistor ± 20 PPM/°C 0.1 mF 1.0 A 600 PIV Figure 9. Speedometer or Tachometer Application 3.9, 500 mW 10 kW 3.0 kW 1.0 kW 0.0033 mF 0.47 mF 0.1 mF 50 V, 500 mW Zener ± 30 PPM/°C C2 2000 mF Notes: 1. C2 (> 2000 mF) is needed if return to zero function is required. 2. The product of C4 and RT have a direct effect on gain and therefore directly affect temperature compensation. 3. C4 Range; 20 pF to 0.2 mF. 4. RT Range; 100 kW to 500 kW. 5. The IC must be protected from transients above 60 V and reverse battery conditions. 6. Additional filtering on the FREQIN lead may be required. 7. Gauge coil connections to the IC must be kept as short as possible (≤ 3.0 inch) for best pointer stability. Design Example Maximum meter Deflection = 270 ° Maximum Input Frequency = 350 Hz 1. Select RT and CCP q + 970 FREQ CCP RT + 270° Let CCP = 0.0033 mF, find RT RT + 270° 970 350 Hz 0.0033 mF RT + 243 kW RT should be a 250 k W potentiometer to trim out any inaccuracies due to IC tolerances or meter movement pointer placement. 2. Select R3 and R4 Resistor R3 sets the output current from the voltage regulator. The maximum output current from the voltage regulator is 10 mA. R3 must ensure that the current does not exceed this limit. Choose R3 = 3.3 k W The charge current for CCP is VREG * 0.7 V 3.3 kW + 1.90 mA CCP must charge and discharge fully during each cycle of the input signal. Time for one cycle at maximum frequency is 2.85 ms. To ensure that CCP is charged, assume that the (R3 + R4) CCP time constant is less than 10% of the minimum input period. T + 10% 1 350 Hz + 285 ms Choose R4 = 1.0 k W. Discharge time: tDCHG = R3 × CCP = 3.3 kW × 0.0033 mF = 10.9 ms Charge time: tCHG = (R3 + R4)CCP = 4.3 kW. × 0.0033 mF = 14.2 ms 3. Determine C4 C4 is selected to satisfy both the maximum allowable ripple voltage and response time of the meter movement. C4 + CCP(VREG * 0.7 V) DVMAX With C4 = 0.47 mF, the F/V ripple voltage is 44 mV. The last component to be selected is the return to zero capacitor C2. This is selected by increasing the input signal frequency to its maximum so the pointer is at its maximum deflection, then removing the power from the circuit. C2 should be large enough to ensure that the pointer always returns to the 0 ° position rather than 360° under all operating conditions. Figure 10 shows how the CS8190 and the CS8441 are used to produce a Speedometer and Odometer circuit. |
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