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38 page 
TSX1 TSX2 TSY1 TSY2 RX1 RX2 RY1 RY2 RC PMOS NMOS TSREF TGATE TO ADC XPOSITIONMEASUREMENT TSX1 TSX2 TSY1 TSY2 RX1 RX2 RY1 RY2 RC PMOS NMOS TSREF TGATE TO ADC Y POSITIONMEASUREMENT TSX1 TSX2 TSY1 TSY2 R X1 R X2 RY1 RY2 R C NMOS NMOS TSREF TGATE TO ADC PRESSUREMEASUREMET IL I L/150 TGATE 22kW TSX1 TSX2 TSY1 TSY2 RX1 RX2 RY1 RY2 RC NMOS TSREF TGATE TO ADC XPLATERESISTANCEMEASUREMENT IL IL/150 TGATE 22kW PMOS TSX1 TSX2 TSY1 TSY2 RX1 RX2 R Y1 R Y2 RC NMOS TSREF TGATE TO ADC Y PLATERESISTANCEMEASUREMENT I L IL/150 TGATE 22kW PMOS SLVS950 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com Table 3. TSC Equations (continued) MEASUREMENT CHANNEL EQUATION Y position AD_IN14 Ypos = Ry2 / y1 + Ry2) = Ry2 / Ry Ry2 = VADC, Ry/VTSREF; Ry1 = Ry – Ry2 Pressure AD_IN14 Rc = R – Rx1//Rx2 – Ry1//Ry2 R = VTSREF/ [(VADC / 22k) × 150] Rx1//Rx2 = Rx × Xpos × (1 – Xpos) Ry1//Ry2 = Ry × Ypos × (1 – Ypos) Figure 35. Two Position Measurement Figure 36. Pressure Measurement Figure 37. Two Plate Resistance Measurement 38 Copyright © 2009, Texas Instruments Incorporated |
