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SS7646 Datenblatt(PDF) 11 Page - Silicon Standard Corp.

Teilenummer SS7646
Bauteilbeschribung  Touch Screen Controller
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Hersteller  SSC [Silicon Standard Corp.]
Direct Link  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS7646 Datenblatt(HTML) 11 Page - Silicon Standard Corp.

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SS7646
8/21/2004 Rev.2.01
Battery Measurement
Another feature of the SS7646 is the battery
measurement ability. Figure 9 shows a block diagram
of a battery voltage monitored by the SS7646.
While the main power to the SS7646 via the
DC/DC regulator is maintained at the desired voltage,
the battery voltage can vary from 0.5V to 6V. The
SS7646 is able to monitor this battery voltage
through the VBAT pin. The voltage on VBAT pin is
divided down by 4 so that the battery voltage of 6V
becomes 1.5V to the ADC input. In order to minimize
the power consumption, the divider is only on during
the sampling phase of the ADC. See Table V for the
control bit configurations required to perform this
battery measurement.
Pressure Measurement
The SS7646 is also able to determine the pen or
finger touch through the pressure measurement with
s o m e s i m ple c a l c u l a t i o n s . T he p r e ss u r e
measurement is based on the contact resistance
between the X and Y plates. Figure 10 shows a block
diagram of the pressure measurement. There are two
recommended methods to perform the measurement.
Generally, the pressure measurement can be
accomplished sufficiently with 8-bit resolution mode,
but the following examples are shown with the
12-bit resolution mode.
Y+
Y-
X+
X-
Rtouch
Y+
Y-
X+
X-
Rtouch
Measure
X-Position
Measure
Z1-Position
Y+
Y-
X+
X-
Rtouch
Measure
Z2-Position
V
V
V
Figure 10. Block Diagram of Pressure Measurement
(1) The first method requires the user knowing the
X-plate resistance. Performing three touch screen
conversions, X-Position, Z1-Position and Z2-position,
then use the following equation to calculate the touch
resistance:
(2) The second method requires the user knowing both
the X-plate and Y-plate resistance. Performing three
touch screen conversions, X-Position, Y-Position and
Z1-position, then use the following equation to
calculate the touch resistance:
Pen Interrupt Request
The pen interrupt function is shown in Figure 11.
Normally the /PENIRQ is HIGH by connecting a
pull-up resistor (typically 100KΩ) to VDD. If /PENIRQ
has been enabled (See Table V), Y- driver is ON and
connected to GND and /PENIRQ diode is connected
to X+ input. When the touch screen connected to the
SS7646 is touched, the X+ input is pulled to
ground through the touch screen and /PENIRQ will go
low, initiating an interrupt to the microprocessor.
During the X and Y plates measurement cycles, the
/PENIRQ diode will be internally connected to GND
and X+ input disconnected from the diode to eliminate
leakage current to the touch screen.
Y+
Y-
X+
/PENIRQ
ENABLE
VDD
100K
/PENIRQ
Figure 11. Block Diagram of Pen Interrupt Circuit
[]1
)
=
1
2
position
xplate
touch
Z
(Z
x
)
4096
(X
x
R
R
[]
4096
)
x Y
R
(
-
Z
(4096
x
4096
)
X
x
R
(
R
position
yplate
1
position
xplate
touch
1
)
=


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