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MAX1233 Datasheet(PDF) 36 Page - Maxim Integrated Products |
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MAX1233 Datasheet(HTML) 36 Page - Maxim Integrated Products |
36 / 44 page ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller 36 ______________________________________________________________________________________ YES SCREEN TOUCH START CLOCK GO TO HOST-INITIATED SCAN (FIGURE 23) NO YES POWER UP ADC YES SET PENIRQ LOW ARE THERE UNREAD SCAN RESULTS? NO CONVERT X- COORDINATES IS TOUCH-SCREEN SETTLING DONE? YES NO STORE X- COORDINATES IN X- REGISTER IS DATA AVERAGING DONE? TURN ON DRIVERS: X+. X- YES NO CONVERT Y- COORDINATES IS TOUCH-SCREEN SETTLING DONE? YES NO STORE Y- COORDINATES IN Y- REGISTER IS DATA AVERAGING DONE? IS PENSTS BIT = 1? SET BUSY LOW TURN ON DRIVERS: Y+, Y- DONE POWER DOWN ADC TURN OFF CLOCK SET BUSY HIGH POWER UP ADC RESET PENIRQ HIGH PENIRQ-INITIATED X- AND Y- SCREEN SCAN NO POWER DOWN ADC Figure 21. Touch-Initiated X- and Y- Coordinate Screen Scan |
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