TSC2005
www.ti.com
SBAS379–DECEMBER 2006
The time needed to convert any Z1 and Z2 coordinate under host control (not including the time needed to send
the command over the SPI bus) is given by:
f
LPPRO
fOSC
OHDLY2
fOSC
OH2
fOSC
1
fOSC
tCOORDINATE
+
OSC )OHCONV
fADC
ǒ
) tPRE)tSNS)
Ǔ)ǒN @ B)2 @
(
)
Ǔ@ ǒ Ǔ)ǒ Ǔ
(9)
Programmed for:
Turn On
Programmed
for
Host-Controlled
Mode
(PSM = 0)
CS
Deactivated
CS
Deactivated
CS
Deactivated
Reading Reading
Z2-Data
Y+
and
Z
Z1-Data
Scan
Mode
Register Register
X-
Drivers(1)
tCOORDINATE
Sample, Conversion, Sample, Conversion,
Detecting
Touch
Detecting
Touch
Waiting for Host to Write
Into Control Byte 1 D[6:3]
Waiting for Host to Write
Into Control Byte 1 D[6:3]
and Preprocessing
for Z1 Coordinate
and Preprocessing
for Z2 Coordinate
PINTDAV Programmed:
Touch is Detected
Touch is Detected
As PENIRQ,
CFR2, D[15:14] = 10
As DAV,
CFR2, D[15:14] = 11 or 01
As PENIRQ and DAV,
CFR2D[15:14] = 00
NOTE: (1) Optional. If not turned on, it will be turned on by the Scan mode, once detected.
Figure 35. Example of Z1 and Z2 Coordinate Touch Screen Scan
(without Panel Stabilization Time) using TSMode 3
The time needed to convert the Z1 and Z2 coordinates under host control (not including the time needed to send
the command over the SPI bus) is given by:
f
LPPRO
fOSC
OHDLY1
fOSC
OH2
fOSC
1
fOSC
tCOORDINATE
+
OSC )OHCONV
fADC
ǒ
) tPVS)tPRE)tSNS
Ǔ)ǒN @ B)2 @
(
)
Ǔ@ ǒ Ǔ)ǒ Ǔ
(10)
CS
Deactivated
CS
Deactivated
CS
Deactivated
Programmed
for
Z1-Z2
Programmed for
Host-Controlled
Mode
Reading Reading
Z2-Data
Z1-Data
Register Register
(PSM = 0)
Scan Mode
tCOORDINATE
Sample, Conversion, and
Into Control Byte 1 D[6:3] Preprocessing for Z1, Z2 Coordinates
Detecting
Touch
Detecting
Touch
Waiting for Host to Write
Waiting for Host to Write
Into Control Byte 1 D[6:3]
PINTDAV Programmed:
Touch is Detected
As PENIRQ,
CFR2, D[15:14] = 10
As DAV,
CFR2, D[15:14] = 11 or 01
Touch is Still Here
As PENIRQ and DAV,
CFR2D[15:14] = 00
Figure 36. Example of a Z1 and Z2 Coordinate Touch Screen Scan
(with Panel Stabilization Time) using TSMode 3
36
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