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CS8191XDWFR20 データシート(PDF) 6 Page - ON Semiconductor |
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CS8191XDWFR20 データシート(HTML) 6 Page - ON Semiconductor |
6 / 12 page CS8191 http://onsemi.com 6 Table 1. Function Generator Output Nominal Angle vs. Ideal Angle (After Calibrating at 270 5) Ideal Q Degrees Nominal Q Degrees Ideal Q Degrees Nominal Q Degrees Ideal Q Degrees Nominal Q Degrees Ideal Q Degrees Nominal Q Degrees Ideal Q Degrees Nominal Q Degrees Ideal Q Degrees Nominal Q Degrees 0 0 17 17.98 34 33.04 75 74.00 160 159.14 245 244.63 1 1.09 18 18.96 35 34.00 80 79.16 165 164.00 250 249.14 2 2.19 19 19.92 36 35.00 85 84.53 170 169.16 255 254.00 3 3.29 20 20.86 37 36.04 90 90.00 175 174.33 260 259.16 4 4.38 21 21.79 38 37.11 95 95.47 180 180.00 265 264.53 5 5.47 22 22.71 39 38.21 100 100.84 185 185.47 270 270.00 6 6.56 23 23.61 40 39.32 105 106.00 190 190.84 275 275.47 7 7.64 24 24.50 41 40.45 110 110.86 195 196.00 280 280.84 8 8.72 25 25.37 42 41.59 115 115.37 200 200.86 285 286.00 9 9.78 26 26.23 43 42.73 120 119.56 205 205.37 290 290.86 10 10.84 27 27.07 44 43.88 125 124.00 210 209.56 295 295.37 11 11.90 28 27.79 45 45.00 130 129.32 215 214.00 300 299.21 12 12.94 29 28.73 50 50.68 135 135.00 220 219.32 305 303.02 13 13.97 30 29.56 55 56.00 140 140.68 225 225.00 14 14.99 31 30.39 60 60.44 145 146.00 230 230.58 15 16.00 32 31.24 65 64.63 150 150.44 235 236.00 16 17.00 33 32.12 70 69.14 155 154.63 240 240.44 Note: Temperature, voltage and nonlinearity not included. CIRCUIT DESCRIPTION and APPLICATION NOTES The CS8191 is specifically designed for use with air–core meter movements. It includes an input comparator for sensing an input signal from an ignition pulse or speed sensor, a charge pump for frequency to voltage conversion, a bandgap voltage regulator for stable operation, and a function generator with sine and cosine amplifiers to differentially drive the meter coils. From the partial schematic of Figure 7, the input signal is applied to the FREQIN lead, this is the input to a high impedance comparator with a typical positive input threshold of 2.7 V and typical hysteresis of 0.4 V. The output of the comparator, SQOUT, is applied to the charge pump input CP+ through an external capacitor CCP. When the input signal changes state, CCP is charged or discharged through R3 and R4. The charge accumulated on CCP is mirrored to C4 by the Norton Amplifier circuit comprising of Q1, Q2 and Q3. The charge pump output voltage, F/VOUT, ranges from 2.0 V to 6.3 V depending on the input signal frequency and the gain of the charge pump according to the formula: F VOUT + 2.0 V ) 2.0 FREQ CCP RT (VREG * 0.7 V) RT is a potentiometer used to adjust the gain of the F/V output stage and give the correct meter deflection. The F/V output voltage is applied to the function generator which generates the sine and cosine output voltages. The output voltage of the sine and cosine amplifiers are derived from the on–chip amplifier and function generator circuitry. The various trip points for the circuit (i.e., 0 °, 90°, 180°, 270°) are determined by an internal resistor divider and the bandgap voltage reference. The coils are differentially driven, allowing bidirectional current flow in the outputs, thus providing up to 305 ° range of meter deflection. Driving the coils differentially offers faster response time, higher current capability, higher output voltage swings, and reduced external component count. The key advantage is a higher torque output for the pointer. The output angle, Θ, is equal to the F/V gain multiplied by the function generator gain: Q + AF V AFG, where: AFG + 77° V(typ) The relationship between input frequency and output angle is: Q + AFG 2.0 FREQ CCP RT (VREG * 0.7 V) or, Q + 970 FREQ CCP RT The ripple voltage at the F/V converter’s output is determined by the ratio of CCP and C4 in the formula: DV + CCP(VREG * 0.7 V) C4 |
同様の部品番号 - CS8191XDWFR20 |
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同様の説明 - CS8191XDWFR20 |
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