전자부품 데이터시트 검색엔진 |
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CS8190ENF16 데이터시트(PDF) 7 Page - Cherry Semiconductor Corporation |
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CS8190ENF16 데이터시트(HTML) 7 Page - Cherry Semiconductor Corporation |
7 / 8 page 7 Speedometer/Odometer or Tachometer Application In some cases a designer may wish to use the CS8190 only as a driver for an air-core meter having performed the F/V conversion elsewhere in the circuit. Figure 8 shows how to drive the CS8190 with a DC voltage ranging from 2V to 6V. This is accomplished by forcing a voltage on the F/VOUT lead. The alternative scheme shown in Figure 9 uses an external op amp as a buffer and oper- ates over an input voltage range of 0V to 4V. Figure 8. Driving the CS8190 from an external DC voltage. An alternative solution is to use the CS4101 which has a separate function generator input lead and can be driven directly from a DC source. Figure 9. Driving the CS8190 from an external DC voltage using an Op Amp Buffer. VIN 0V to 4V DC F/VOUT CP- CS8190 BIAS 100k W 100k W + - + - 10k W 100k W 100k W F/VOUT CP- CS8190 BIAS 10k W 100k W VREG N/C VIN 2V to 6V DC Figure 6 R1 - 3.9, 500mW R2 - 10k½ R3 - 3k½ R4 - 1k½ RT - Trim Resistor ±20 PPM/DEG. C C1 - 0.1µF C2 - 1. Stand alone Speedo or Tach with return to Zero, 2000µF 2. With CS8441 application, 10µF C3 - 0.1µF C4 - 0.47µF CT - 0.0033µF, ±30 PPM/¡C D1 - 1A, 600 PIV D2 - 50V, 500mW Zener Note 1: C2 (> 2000µF) is needed if return to zero function is required. Note 2: The product of C4 and R4 have a direct effect on gain and therefore directly effect temperature compensation. Note 3: C4 Range; 20pF to .2µF. Figure 7 Note 4: R4 Range; 100k½ to 500k½. Note 5: The IC must be protected from transients above 60V and reverse battery conditions. Note 6: Additional filtering on the FREQIN lead may be required. 1 CP+ 2 3 4 5 6 7 8 SQOUT FREQIN Gnd Gnd COS+ COS- VCC 16 15 14 13 12 11 10 9 CP- F/VOUT VREG Gnd Gnd SINE+ SINE- BIAS CT R3 C3 C1 D2 R1 D1 + C4 RT COSINE SINE Air Core Gauge 200 W Speedometer Gnd Battery Speedo Input R2 R4 1 CS8441 C2 Air Core Stepper Motor 200 W Odometer CP+ 1 CP+ 2 3 4 5 6 7 8 SQOUT FREQIN Gnd Gnd COS+ COS- VCC 16 15 14 13 12 11 10 9 CP- F/VOUT VREG Gnd Gnd SINE+ SINE- BIAS CT R3 C3 C1 D2 R1 D1 + C4 RT COSINE SINE Air Core Gauge 200 W Speedometer Gnd Battery Speedo Input C2 R2 R4 CP+ |
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