Datasheet
TSC2101
SLAS392D− JUNE 2003 − REVISED MAY 2005
www.ti.com
78
Touch Screen Conversion Initiated by the Host
The time needed to convert any single coordinate either X or Y under host-controlled mode (not including the time
needed to send the command over the SPI bus) is given by:
t
coordinate
+
ȧ
ȱ
Ȳ
ǒ
t
PVS
Ǔ
125 ns
ȧ
ȳ
ȴ
t
OSC
) NJN
AVG
ƪ
ǒ
N
BITS
) 1
Ǔ
8MHz
ƒ
conv
) n
1
) 12
ƫ
) 1Nj
t
OSC
) 14 t
OSC
) n
2
t
OSC
n
1
= 6 ; if ƒ
conv
= 8 MHz
7 ; if ƒ
conv
≠ 8 MHz
n
2
= 2 ; if t
PVS
= 0 µs
0 ; if t
PVS
≠
0 µs
Programmed
for Host
Controlled
Mode
Detecting Touch
Sample,Conversion &
Averaging for
X−Coordinate
Reading
X−Data
Register
Touch is still there
Touch is detected
/PINTDAV
(As /PENIRQ
[D15−D14 = 00])
/PINTDAV
(As /DATA_AVA
[D15−D14 = 01])
/PINTDAV
(As /PENIRQ & DATA_AVA
[D15−D14 = 10/11])
Waiting for Host to write
into REG−00 of PAGE−01
Waiting for Host to write into
REG−00 of PAGE−01
REG−00 of
PAGE−01
is updated
for
X Scan
Mode
/SS DEACTIVATED
Detecting
Touch
t
coordinate
+
ȧ
ȱ
Ȳ
ǒ
t
PVS
Ǔ
125 ns
ȧ
ȳ
ȴ
t
OSC
) 2 NJN
AVG
ƪ
ǒ
N
BITS
) 1
Ǔ
8MHz
ƒ
conv
) n
1
) 12
ƫ
) 1Nj
t
OSC
) 20 t
OSC
) n
2
t
OSC
n
1
= 6 ; if ƒ
conv
= 8 MHz
7 ; if ƒ
conv
≠ 8 MHz
n
2
= 2 ; if t
PVS
= 0 µs
0 ; if t
PVS
≠
0 µs