TSC2004 datasheet(44/62 Pages) TI2

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Conversion Controlled by TSC2004 Initiated by Host (TSMode 2)

COORDINATE

OH1

OSC

)2 @ tPVS)tPRE)tSNS)

DLY1

OSC

)2 @ N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(7)

Detecting

Touch

PINTDAV Programmed:

CFR2,D[15:14]=10

PENIRQ

CFR2,D[15:14]=11or01

DAV

and

CFR2,D[15:14]=00

PENIRQ

DAV

Programmed

for

Host-

Controlled

Mode

(PSM=0)

TSC

Not

Addressed

P ogra

mm d

for

X-Y

ScanMode

Reading

X-Data

WaitingforHostto

WriteInto

ControlByte1D[6:3]

Sample,Conversion,

andPreprocessingfor

YCoordinate

TouchisStillHere

Reading

Y-Data

TSC

NotAddressed

TSC

NotAddressed

Detecting

Touch

TouchisDetected

Sample,Conversion,

andPreprocessingfor

XCoordinate

Detecting

Touch

COORDINATE

Detecting

Touch

Sample,Conversion,

andPreprocessingfor

YCoordinate

TSC2004

SBAS408E – JUNE 2007 – REVISED MARCH 2008

In TSMode 2, the TSC2004 detects when the touch panel is touched and causes the internal Pen-Touch signal

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

request, and then writes to the A/D Converter Control register to select one of the two touch screen scan

functions:

1. X-Y-Z Scan (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0000); or

2. X-Y Scan (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0001).

See Table 7 for more information on the converter function select bits.

The conversion process then proceeds as shown in Figure 41; see the previous sections for more details.

The main difference between this mode and the previous mode is that the host, not the TSC2004, decides when

the touch screen scan begins.

The time needed to convert both X and Y coordinates under host control (not including the time needed to send

the command over the I2C bus) is given by:

Figure 41. Example of an X and Y Coordinate Touch Screen Scan using TSMode 2

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