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參數(shù)資料
| 型號： | TSC2200 |
| 英文描述： | PDA ANALOG INTERFACE CIRCUIT |
| 中文描述： | 掌上電腦模擬接口電路 |
| 文件頁數(shù)： | 11/40頁 |
| 文件大?。?/td> | 645K |
| 代理商： | TSC2200 |
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www.ti.com
TSC2200
SBAS191F
FIGURE 5. Ideal Input Voltages and Output Codes.
FIGURE 6.
PENIRQ
Functional Block Diagram.
O
0V
FS = Full-Scale Voltage = V
REF(1)
1LSB = V
REF(1)
/4096
FS
–
1LSB
11...111
11...110
11...101
00...010
00...001
00...000
1LSB
NOTES: (1) Reference voltage at converter: +REF
–
(
–
REF). See Figure 4.
(2) Input voltage at converter, after multiplexer: +IN
–
(
–
IN). See Figure 4.
Input Voltage
(2)
(V)
V
DD
V
DD
50k
ON
Y+ or X+ Drivers On,
or TEMP1, TEMP2
Measurements Activated
Y+
X+
Y
–
HIGH Except
when TEMP1,
TEMP2 Activated
PENIRQ
TEMP2
TEMP1
TEMP
DIODE
A unique configuration of low on-resistance switches allows
an unselected A/D converter input channel to provide power
and an accompanying pin to provide ground for driving the
touch panel. By maintaining a differential input to the con-
verter and a differential reference input architecture, it is
possible to negate errors caused by the driver switch on-
resistances.
The A/D converter is controlled by an A/D Converter Control
Register. Several modes of operation are possible, depend-
ing upon the bits set in the control register. Channel selec-
tion, scan operation, averaging, resolution, and conversion
rate may all be programmed through this register. These
modes are outlined in the sections below for each type of
analog input. The results of conversions made are stored in
the appropriate result register.
Data Format
The TSC2200 output data is in Straight Binary format, as
shown in Figure 5. This figure shows the ideal output code for
the given input voltage and does not include the effects of
offset, gain, or noise.
Reference
The TSC2200 has an internal voltage reference that can be
set to 1.25V or 2.5V, through the Reference Control Register.
The internal reference voltage is only used in the single-
ended mode for battery monitoring, temperature measure-
ment, and for utilizing the auxiliary inputs. Optimal touch
screen performance is achieved when using a ratiometric
conversion, thus all touch screen measurements are done
automatically in the differential mode. An external reference
can also be applied to the V
REF
pin, and the internal refer-
ence can be turned off.
Variable Resolution
The TSC2200 provides three different resolutions for the A/D
converter: 8-, 10-, or 12-bits. Lower resolutions are often
practical for measurements such as touch pressure. Perform-
ing the conversions at lower resolutions reduces the amount of
time it takes for the A/D converter to complete its conversion
process, which lowers power consumption.
Conversion Clock and Conversion Time
The TSC2200 contains an internal 8MHz clock, which is used
to drive the state machines inside the device that perform the
many functions of the part. This clock is divided down to
provide a clock to run the A/D converter. The division ratio for
this clock is set in the A/D Converter Control Register. The
ability to change the conversion clock rate allows the user to
choose the optimal value for resolution, speed, and power. If
the 8MHz clock is used directly, the A/D converter is limited to
8-bit resolution; using higher resolutions at this speed will not
result in accurate conversions. Using a 4MHz conversion
clock is suitable for 10-bit resolution; 12-bit resolution requires
that the conversion clock run at 1MHz or 2MHz.
Regardless of the conversion clock speed, the internal clock
will run nominally at 8MHz. The conversion time of the
TSC2200 is dependent upon several functions. Although the
conversion clock speed plays an important role in the time it
takes for a conversion to complete, a certain number of
internal clock cycles is needed for proper sampling of the
signal. Moreover, additional times, such as the Panel Voltage
Stabilization time, can add significantly to the time it takes to
perform a conversion. Conversion time can vary depending
upon the mode in which the TSC2200 is used. Throughout
this data sheet, internal and conversion clock cycles will be
used to describe the times that many functions take. In
considering the total system design, these times must be
taken into account by the user.
Touch Detect
The pen interrupt (
PENIRQ
) output function is detailed in
Figure 6. While in the power-down mode, the Y
–
driver is ON
and connected to GND and the
PENIRQ
output is connected
to the X+ input. When the panel is touched, the X+ input is
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