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CS4122 Folha de dados(PDF) 6 Page - ON Semiconductor |
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CS4122 Folha de dados(HTML) 6 Page - ON Semiconductor |
6 / 9 page CS4122 http://onsemi.com 6 Quadrant IV q + 360° * Tan−1 (VSIN )) * (VSIN*) (VCOS )) * (VCOS*) For q + 270.176°to 314.824° : VSIN +*0.748 VBB VCOS + Tan(q * 270°) 0.748 VBB For q + 315.176° * 359.824° : VSIN +*Tan (360° * q) 0.748 VBB VCOS + 0.748 VBB 270 ° VSIN− VSIN+ 90 ° VCOS− VCOS+ 180 ° 360/0 ° 0.748 VBB 0.748 VBB 0.748 VBB 0.748 VBB q IV III II I Figure 3. Major Gauge Response The minor gauge coil outputs differ in that only one of the coils in each movement is driven by the IC. The other is driven directly by the analog supply voltage, specifically one−half of this voltage. The common output assures that this is true. By varying the voltage across the other coil to a greater voltage, the pointer can be deflected more than 45 ° to each side of the externally driven coil. This relationship is shown in Figure 4. Note: There are actually eight segments, but only the are shown here for simplicity. 0 ° 14 ° 28 ° 42 ° 56 ° 70 ° 84 ° 98 ° 112 ° Degrees of Rotation C+ Output Max(128) C− Output Max(128) Min(0) Min(0) 00 1F 3F 5F 7F 9F BF DF FF Code16 Figure 4. Minor Gauge Outputs Quadrant I, II q + 56.1° * Tan−1 (VC )) * (VC*) VBB * V(VBB 2) VCOIL + V(VBB 2) Tan (56.1 ° * q) Figure 5. Minor Gauge Outputs VC− VC+ 0.744 VBB 0.744 VBB 0 ° (−56.1) 112.2 ° 56.1 ° VBB/2 q III To drive a gauge’s pointer to a particular angle, the microcontroller sends a 12 bit digital word to the CS4122. These 12 bits are divided as shown in Figure 6. However, from a software programmer’s viewpoint, a 360 ° circle is divided into 1024 equal parts of 0.35 ° each and a 112.2° arc is divided into 256 parts of 0.44 ° each. Table 1 shows the data associated with the 45 ° divisions of the 360° driver. Table 2 shows the data for the center and end points of the 112.2 ° drivers. Setting the address to “11” disables all outputs. Gauge Address = “00” D9 − D7 select which octant Divides a 45 ° octant into 128 equal parts to achieve a 0.35 ° resolution Code 0 − 12710 Major Gauge (360 °) MSB LSB D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D10 D11 Gauge Address = “01” Set to “00” Deflection angle 0 − 112.2 °, to achieve a 0.44 ° resolution Code 0 − 25510 Minor Gauge #1 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D10 D11 Gauge Address = “10” Set to “00” Deflection angle 0 − 112.2 °, to achieve a 0.44 ° resolution Code 0 − 25510 Minor Gauge #2 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D10 D11 Gauge Address = “11” All Outputs Disabled; D9 − D0 = “Don’t Care” All Gauges Disabled D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D10 D11 Figure 6. Definition of Serial Word |
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Descrição semelhante - CS4122 |
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