TSC2014IYZGR datasheet(27/62 Pages) TI2

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OSC

PPRO

DLY1

COORDINATE

PVS

PRE

SNS

CONV

OSC

ADC

OSC

OH2

· §

¸ ¨

¹ ©

Programmedfor

Self-Control

X-YScanMode

(PSM=1)

(ControlByte1

D[6:3]=0001)

TSC

NotAddressed

DetectingTouch

Sample,Conversion,and

Preprocessingfor

YCoordinate

Detecting

Touch

Sample,Conversion,and

Preprocessingfor

XCoordinate

Sample,Conversion,and

Preprocessingfor

YCoordinate

Detecting

Touch

Detecting

Touch

Reading

X-Data

Reading

Y-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

TSC2014

www.ti.com

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

Product Folder Links: TSC2014

Submit Documentation Feedback

Device Functional Modes (continued)

Table 4. Preprocessing Delay

LPPRO =

M =

W =

FOR B = 12 BIT

FOR B = 10 BIT

1, 4, 8, 16

3, 7

Figure 25. Example of an X and Y Coordinate Touch Screen Scan Using TSMode 1

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 26. 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:

(6)

Where:

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

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