TSC2014IYZGR datasheet(30/62 Pages) TI2

30 / 62 page

Programmed

forHost-

Controlled

Mode

(PSM=0)

Scan

Mode

Programmedfor:

TurnOn

X+and

Drivers

(1)

Reading

Y-Data

TouchisDetected

NOTE:(1)Optional.Ifnotturnedon,itwillbeturnedonbytheScanmode,oncedetected.

Scan

Mode

Programmedfor:

TurnOn

Y+and

Drivers

(1)

Reading

X-Data

Detecting

Touch

WaitingforHosttoWriteInto

ControlByte1D[6:3]

PINTDAV Programmed:

CFR2,D[15:14]=10

PENIRQ

CFR2,D[15:14]=11or01

DAV

and

CFR2,D[15:14]=00

PENIRQ

DAV

TouchisDetected

Sample,Conversion,

andPreprocessing

forXCoordinate

Detecting

Touch

Sample,Conversion,

andPreprocessing

forYCoordinate

Detecting

Touch

WaitingforHostto

WriteIntoControl

Byte1D[6:3]

WaitingforHosttoWriteInto

ControlByte1D[6:3]

COORDINATE

TSC

Not

Addressed

TSC

Not

Addressed

TSC

Not

Addressed

TSC

Not

Addressed

OSC

PPRO

DLY2

COORDINATE

PRE

SNS

CONV

OSC

ADC

OSC

OH1

· §

¸ ¨

¹ ©

TSC2014

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: TSC2014

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7.4.2.3 Conversion Controlled by Host (TSMode 3)

In TSMode 3, the TSC2014 detects when the touch panel is touched and causes the internal Pen-Touch signal

to be active, which lowers the PINTDAV output if it is programmed as PENIRQ. The host recognizes the interrupt

request. Instead of starting a sequence in the TSC2014, which then reads each coordinate in turn, the host must

now control all aspects of the conversion. Generally, upon receiving the interrupt request, the host turns on the X

drivers.

NOTE

If drivers are not turned on, the device detects this condition and turns them on before the

scan starts. This situation is why the event of Turn On Drivers is shown as optional in

Figure 28 and Figure 29.

After waiting for the settling time, the host then addresses the TSC2014 again, this time requesting an X

coordinate conversion.

The process is then repeated for the Y and Z coordinates. The processes are outlined in Figure 28 and Table 5.

Figure 28 shows two consecutive scans on X and Y. Figure 29 shows a single Z scan.

The time needed to convert any single coordinate X or Y under host control (not including the time needed to

send the command over the I2C bus) is given by:

(8)

Where:

OHDLY2 = total overhead time for tPRE and tSNS = 6 internal clock cycles.

Figure 28. Example of X and Y Coordinate Touch Screen Scan Using TSMode 3

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