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TSC2000IPWR 数据表(PDF) 19 Page - Texas Instruments |
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TSC2000IPWR 数据表(HTML) 19 Page - Texas Instruments |
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19 / 34 page  19 www.ti.com TSC2000 SBAS257 FIGURE 8. X- and Y-Coordinate Touch Screen Scan, Initiated by Touch. Screen Touch Issue Interrupt PENIRQ Go to Host-Controlled Conversion Touch Screen Scan X and Y PENIRQ Initiated Done Done No No Yes Yes Yes No No Yes Is Data Averaging Done Is Screen Touched Is Panel Voltage Stabilization Done Turn On Drivers: Y+, Y– Start Clock Store Y-Coordinates in Y-Register Power Down A/D Converter Power Up A/D Converter Reset PENIRQ and Scan Trigger Turn Off Clock Convert Y-Coordinates Is PSM = 1 No Yes No Is Screen Touched Is Data Averaging Done No Yes Yes Is Panel Voltage Stabilization Done Convert X-Coordinates Turn On Drivers: X+, X– Power Up A/D Converter Store X-Coordinates in X-Register Reset PENIRQ and Scan Trigger Power Down A/D Converter Turn Off Clock Issue Data Available The time needed to get a complete X/Y-coordinate reading can be calculated by: (3) t 2.5 s + 2 t + t + t 2N N 1 f s COORDINATE PVS PRE SNS AVG BITS CONV = ( ) +• + µ µ 44 . where, tCOORDINATE = time to complete X/Y-coordinate reading tPVS = Panel Voltage Stabilization time, see Table XII tPRE = precharge time, see Table XXII tSNS = sense time, see Table XXIII NAVG = number of averages, see Table X; for no averag- ing, NAVG = 1 NBITS = number of bits of resolution, see Table IX fCONV = A/D converter clock frequency, see Table XI If the pressure of the touch is also to be measured, the process will continue in the same way, but measuring the Z1 and Z2 values, and placing them in the Z1 and Z2 registers, see Figure 9. As before, this process time depends upon the settings described above. The time for a complete X, Y, Z1, and Z2 coordinate reading is given by: (4) t 4.75 s + 3 t + t + t 4N N 1 f s COORDINATE PVS PRE SNS AVG BITS CONV =µ ( ) +• + µ 44 . |
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