TSC2005
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SBAS379–DECEMBER 2006
The time needed to convert any single coordinate (either X or Y) under host control (not including the time
needed to send the command over the SPI bus) is given by:
f
LPPRO
fOSC
OHDLY1
fOSC
OH1
fOSC
1
fOSC
tCOORDINATE
+
)
OSC )OHCONV
fADC
ǒ
) tPVS)tPRE)tSNS
Ǔ)ǒN @ B)2 @
(
)
Ǔ@ ǒ Ǔ)ǒ Ǔ
(11)
CS
Deactivated
CS
Deactivated
CS
Deactivated
Programmed
Programmed for
Host-Controlled
Mode
Reading
X-Data
Register
for
X
(PSM = 0)
Scan Mode
tCOORDINATE
Detecting
Touch
Detecting
Touch
Waiting for Host to Write
Into Control Byte 1 D[6:3]
Sample, Conversion, and
Preprocessing for X Coordinate
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,
CFR2, D[15:14] = 00
Figure 37. Example of a Single X Coordinate Touch Screen Scan
(with Panel Stabilization Time) using TSMode 3
37
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