TSC2004 datasheet(45/62 Pages) TI2

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Conversion Controlled by Host (TSMode 3)

COORDINATE

OH1

OSC

) tPRE)tSNS)

DLY2

OSC

)N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(8)

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

TSC2004

SBAS408E – JUNE 2007 – REVISED MARCH 2008

In TSMode 3, the TSC2004 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 TSC2004, 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 42 and Figure 43.) After

waiting for the settling time, the host then addresses the TSC2004 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 42 and

Figure 43. Figure 42 shows two consecutive scans on X and Y. Figure 43 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:

Where:

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

Figure 42. Example of X and Y Coordinate Touch Screen Scan using TSMode 3

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