TSC2005 datasheet(34/46 Pages) TI2

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COORDINATE

OH2

OSC

)3 @ tPVS)tPRE)tSNS)

DLY1

OSC

)4 @ N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(6)

Programmedfor

Self-Control

(PSM=1)

X-Y-Z -Z ScanMode

(ControlByte1

D[6:3]=0000)

CS Deactivated

Sample,Conversion,

andPreprocessingfor

YCoordinate

Sample,Conversion,

andPreprocessingfor

XCoordinate

Sample,Conversion,

andPreprocessingfor

Z CoordinateandZ Coordinate

Sample,Conversion,

andPreprocessingfor

YCoordinate

Reading

X-Data

TouchisDetected

Detecting

Touch

Detecting

Touch

Detecting

Touch

Detecting

Touch

Reading

Y-Data

Reading

Z -Data

Reading

Z -Data

TouchisDetected

PINTDAV Programmed:

CFR2,D[15:14]=10

PENIRQ

CFR2,D[15:14]=11or01

DAV

and

CFR2,D[15:14]=00

PENIRQ

DAV

COORDINATE

Detecting

Touch

TSC2005

SBAS379C – DECEMBER 2006 – REVISED MARCH 2008

If the pressure of the touch is also to be measured, the process continues in the same way, but measuring the Z1

and Z2 values instead, and storing the results in temporary registers. Once the complete sample set of data (X,

Y, Z1, and Z2) are available, they are loaded in the X, Y, Z1, and Z2 registers. This process is illustrated in

Figure 33. As before, this process time depends upon the settings previously described. The time for a complete

X, Y, Z1, and Z2 coordinate reading is given by:

Where:

OH2 = overhead time #2 = 3.5 internal clock cycles.

Figure 33. Example of X, Y, and Z Coordinate Touch Screen Scan using TSMode 1

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