
(
)
(
)
coordinate
PVS
AVG
BITS
CONV
AVG
1
CLK
t
2
N
1
t
2
N
n
13
t
22
t
=
+
+
+
+
+
Programmed
forSelf-
Controlled
Z-ScanMode
Detecting Touch
Sample,Conversionand Averagingfor
Z1-CoordinateandZ2-Coordinate
Reading
Z1-Data
Register
Detecting
Touch
TouchIsDetected
CONTROL INTERFACEDEACTIVATED
TouchIsDetected
PINTDAV
(As
[P3/R3,D1–D0=00])
PENIRQ
PINTDAV
(AsDATA_AVA
[P3/R3,D1–D0=01])
PINTDAV
(As
andDATA_AVA
[P3/R3,D1–D0=10])
PENIRQ
TouchIsDetected
Reading
Z2-Data
Register
Sample,Conversionand Averagingfor
Z1-CoordinateandZ2-Coordinate
Programmed
forHost-
Controlled
Mode
Reading
Y-Data
Register
Sample,Conversion
and Averagingfor
Y-Coordinate
Detecting
Touch
TouchIsDetected
P3/R3
IsUpdated
for
X-Y Scan
Mode
WaitingforHostto
WriteIntoP3/R3
CONTROL INTERFACEDEACTIVATED
PINTDAV
(As
andDATA_AVA
[P3/R3,D1–D0=10])
PENIRQ
PINTDAV
(As
[P3/R3,D1–D0=00])
PENIRQ
TouchIsDetected
PINTDAV
(As
[P3/R3,D1–D0=01])
DATA_AVA
Reading
X-Data
Register
Detecting
Touch
Sample,Conversion
and Averagingfor
X-Coordinate
Detecting
Touch
Sample,Conversion
and Averagingfor
Y-Coordinate
Detecting
Touch
5.7.9.3 Non-Touch-Screen Measurement Operation
(
)
(
)
AVG
BITS
CONV
AVG
1
2
CLK
3
CLK
t
N
1
t
N
n
t
17
t
n
t
=
+
+
+
+
+
TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
www.ti.com
SLAS550A – APRIL 2009 – REVISED JUNE 2009
5.7.9.2.2 Host-Controlled Z1-Z2 Scan Mode
where:
n1 = 6 if DIV1 = 1; otherwise, n1 = 7
Figure 5-53. Host-Controlled Z1-Z2 Scan Mode
5.7.9.2.3 Host-Controlled X-Y Scan Mode
Figure 5-54. Host-Controlled X-Y Scan Mode
5.7.9.3.1 Host-Controlled VBAT Scan Mode
The time needed to make temperature, auxiliary, or battery measurements is given by:
(1)
This equation is valid if page 2/register 18, bits D6–D5 = 00, which means SAR data update is not kept on hold for reading converted
data.
(2)
The programmable delay tREF scales accordingly based on the actual divider setting and time period of the clock used to generate
this. See the respective control register settings to understand the scale factors.
where:
DIV1 = Divider setting configured in page 3/register 2, bits D4–D3; or 4 if VBAT is used as the normal
AUX input by setting page 3/register 6, bit D0 = 0
NBITS = SAR ADC resolution configured in page 3/register 2, bits D6–D5; or 12 if VBAT is used as
normal aux input by setting page 3/register 6, bit D0 = 0
APPLICATION INFORMATION
85