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SS7646 датащи(PDF) 9 Page - Silicon Standard Corp.

номер детали SS7646
подробное описание детали  Touch Screen Controller
PDF  13 Pages
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производитель  SSC [Silicon Standard Corp.]
домашняя страница  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS7646 датащи(HTML) 9 Page - Silicon Standard Corp.

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SS7646
8/21/2004 Rev.2.01
Reference Input
The voltage difference between +REF and –REF
(shown VREF in Figure 5), in the range of 1V to + VDD,
sets the Analog-to-Digital converter (ADC) input
range. The full-scale analog input range of
the
SS7646 is therefore from 0 to V REF.
Typically the reference input is an external precise
voltage source VREF (MODE0=1, see Table IV) for
touch screen and auxiliary inputs measurement.
Figure 6 shows the configuration for a Y coordinate
measurement with MODE0=1. When utilizing the
panel measurement, the VREF must equal VDD as input
range is from 0 to VDD. If the reference input is from
the power supply directly, as Figure 12 shows for
example, special care must be taken to avoid noise
from the power supply.
When making touch screen measurements only, the
reference input can be set from VDD directly
(MODE0=0) and discard the VREF input. Figure 7
shows the configuration for a Y coordinate
measurement with MODE0=0.
Examples of DIN Configuration
Table VI shows DIN configurations for specified
applications.
ADC
VREF
A2A1A0
(Shown 101)
+REF
-REF
MODE0 = 1
IN
X+
VDD
GND
Y-
Y+
VDD
GND
Internal 2.5V
Reference
Figure 6. Touch
Screen Measurement with MODE0=1
ADC
VREF
A2A1A0
(Shown 101)
+REF
-REF
MODE0 = 0
IN
X+
VDD
GND
Y-
Y+
VDD
GND
Internal 2.5V
Reference
Figure 7. Touch
Screen Measurement with MODE0=0
Measurement
S
A2 A1 A0 MODE1 MODE0 PD1 PD0
+REF
X SWITCHES
Y SWITCHES
Touch Screen
Y-Position (X+)
1
0
0
1
0
0 / 1
0
0
VDD / VREF
OFF
ON
X-Position (Y+)
1
1
0
1
0
0 / 1
0
0
VDD / VREF
ON
OFF
Z1-Position (X+) 1
0
1
1
0
0 / 1
0
0
VDD / VREF
X+ OFF, X- ON Y+ ON , Y- OFF
Z2-Position (Y -) 1
1
0
0
0
0 / 1
0
0
VDD / VREF
X+ OFF, X- ON Y+ ON , Y- OFF
Battery
VBAT
1
0
1
0
0
1
1
1
VREF
OFF
OFF
-
1
0
1
0
*
0
*
*
Invalid Configuration
Auxiliary In.
VIN
1
1
1
0
0
1
1
1
VREF
OFF
OFF
-
1
1
1
0
*
0
*
*
Invalid Configuration
Temperature
TEMP1
1
1
1
1
0
1
1
1
VREF
OFF
OFF
TEMP0
1
0
0
0
0
1
1
1
VREF
OFF
OFF
-
1
1
1
1
*
0
*
*
Invalid Configuration
-
1
0
0
0
*
0
*
*
Invalid Configuration
Table VI
. Examples of DIN Configuration



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