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PDF TSC2200 Data sheet ( Hoja de datos )
| Número de pieza | TSC2200 | |
| Descripción | PDA ANALOG INTERFACE CIRCUIT | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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TSC2200
TSC2200
TSC2200
SBAS191F – FEBRUARY 2001 – REVISED APRIL 2004
PDA ANALOG INTERFACE CIRCUIT
FEATURES
q 4-WIRE TOUCH SCREEN INTERFACE AND
4-BY-4 KEYPAD INTERFACE
q RATIOMETRIC CONVERSION
q SINGLE 2.7V TO 3.6V SUPPLY
q SERIAL INTERFACE
q INTERNAL DETECTION OF SCREEN TOUCH
AND KEYPAD
q PROGRAMMABLE 8-, 10-, OR 12-BIT
RESOLUTION
q PROGRAMMABLE SAMPLING RATES
q DIRECT BATTERY MEASUREMENT (0.5V to 6V)
q ON-CHIP TEMPERATURE MEASUREMENT
q TOUCH-PRESSURE MEASUREMENT
q FULL POWER-DOWN CONTROL
q TSSOP-28 AND QFN-32 PACKAGES
X+
X–
Y+
Y–
VBAT1
VBAT2
AUX1
AUX2
VREF
ARNG
AOUT
C1 C2 C3 C4 R1 R2 R3 R4
Keyboard Scanner
and State Control
Touch Panel
Drivers
Temp Sensor
Battery Monitor
Battery Monitor
MUX
D/A Converter
APPLICATIONS
q PERSONAL DIGITAL ASSISTANTS
q CELLULAR PHONES
q MP3 PLAYERS
DESCRIPTION
The TSC2200 is a complete PDA analog interface circuit. It
contains a complete 12-bit, Analog-to-Digital (A/D) resistive
touch screen converter including drivers, the control to mea-
sure touch pressure, keyboard controller, and an 8-bit Digital-
to-Analog (D/A) converter output for LCD contrast control.
The TSC2200 interfaces to the host controller through a
standard SPI™ serial interface. The TSC2200 offers program-
mable resolution and sampling rates from 8- to 12-bits and up
to 125kHz to accommodate different screen sizes.
The TSC2200 also offers two battery-measurement inputs
capable of reading battery voltages up to 6V, while operating
at only 2.7V. It also has an on-chip temperature sensor
capable of reading 0.3°C resolution. The TSC2200 is available
in a TSSOP-28 and a QFN-32 package.
SPI is a registered trademark of Motorola.
US Patent No. 624639.
Clock
A/D Converter
Serial
Interface
and
Control
Logic
MISO
SS
SCLK
MOSI
DAV
PENIRQ
KBIRQ
Internal 2.5V
Reference
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001-2004, Texas Instruments Incorporated
1 page  
TYPICAL CHARACTERISTICS
At TA = +25°C, +VDD = +2.7V, conversion clock = 2MHz, 12-bit mode, and VREF = +2.5V, unless otherwise noted.
CONVERSION SUPPLY CURRENT vs TEMPERATURE
1.86
1.85
1.84
1.83
1.82
1.81
1.80
1.79
1.78
–60 –40 –20
0 20 40
Temperature (°C)
60
80 100
POWER-DOWN SUPPLY CURRENT
vs TEMPERATURE
10
8
6
4
2
0
–40
–20
0 20 40 60
Temperature (°C)
80 100
0.30
0.25
0.20
0.15
0.10
0.05
0
2.7
POWER-DOWN SUPPLY CURRENT vs
SUPPLY VOLTAGE
2.9 3.1 3.3 3.5
Supply Voltage (V)
3.7
INTERNAL OSCILLATOR FREQUENCY vs VDD
8.7
8.6
8.5
8.4
8.3
8.2
8.1
2.5 2.7 2.9 3.1 3.3 3.5 3.7
VDD (V)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–60
CHANGE IN GAIN ERROR vs TEMPERATURE
–40 –20 0 20 40 60 80
Temperature (°C)
100
CHANGE IN OFFSET ERROR vs TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–60 –40 –20 0 20 40 60 80 100
Temperature (°C)
TSC2200
SBAS191F
www.ti.com
5
5 Page 
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.
11...111
11...110
11...101
FS = Full-Scale Voltage = VREF(1)
1LSB = VREF(1)/4096
1LSB
00...010
00...001
00...000
0V FS – 1LSB
Input Voltage(2) (V)
NOTES: (1) Reference voltage at converter: +REF – (–REF). See Figure 4.
(2) Input voltage at converter, after multiplexer: +IN – (–IN). See Figure 4.
FIGURE 5. Ideal Input Voltages and Output Codes.
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 VREF 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
Y+
HIGH Except
when TEMP1,
TEMP2 Activated
X+
VDD
50kΩ
PENIRQ
VDD
TEMP1
TEMP2
TEMP
DIODE
Y–
ON
Y+ or X+ Drivers On,
or TEMP1, TEMP2
Measurements Activated
FIGURE 6. PENIRQ Functional Block Diagram.
TSC2200
SBAS191F
www.ti.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TSC2200.PDF ] | |
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