TSC2007 [BB]
1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with I2C Interface; 1.2V至3.6V ， 12位，纳安级，4线微型触摸屏控制器的I2C接口
| 型号： | TSC2007 |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | 1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with I2C Interface |
| 文件： | 总38页 (文件大小：715K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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TSC2007
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SBAS405–MARCH 2007
1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire
Micro TOUCH SCREEN CONTROLLER with I2C™ Interface
FEATURES
APPLICATIONS
•
•
•
•
•
Cellular Phones
PDA, GPS, and Media Players
Portable Instruments
Point-of-Sale Terminals
Multiscreen Touch Control
•
•
•
•
4-Wire Touch Screen Interface
Single 1.2V to 3.6V Supply/Reference
Ratiometric Conversion
Effective Throughput Rate:
–
Up to 20kHz (8-Bit) or 10kHz (12-Bit)
•
•
Preprocessing to Reduce Bus Activity
I2C Interface Supports:
DESCRIPTION
The TSC2007 is a very low-power touch screen
controller designed to work with power-sensitive,
handheld applications that are based on an
advanced low-voltage processor. It works with a
supply voltage as low as 1.2V, which can be
supplied by a single-cell battery. It contains a
complete, ultra-low power, 12-bit, analog-to-digital
(A/D) resistive touch screen converter, including
drivers and the control logic to measure touch
pressure.
–
Standard, Fast, and High-Speed Modes
•
Simple, Command-Based User Interface:
–
–
TSC2003 Compatible
8- or 12-Bit Resolution
•
•
•
•
•
•
On-Chip Temperature Measurement
Touch Pressure Measurement
Digital Buffered PENIRQ
On-Chip, Programmable PENIRQ Pullup
Auto Power-Down Control
Low Power:
In addition to these standard features, the TSC2007
offers preprocessing of the touch screen
measurements to reduce bus loading, thus reducing
the consumption of host processor resources that
can then be redirected to more critical functions.
The TSC2007 supports an I2C serial bus and data
transmission protocol in all three defined modes:
–
–
–
32.24µA at 1.2V, Fast Mode, 8.2kHz Eq Rate
39.31µA at 1.8V, Fast Mode, 8.2kHz Eq Rate
53.32µA at 2.7V, Fast Mode, 8.2kHz Eq Rate
•
Enhanced ESD Protection:
standard,
programmable resolution of
accommodate different screen
performance needs.
fast,
and
high-speed.
or 12 bits to
sizes and
It
offers
–
–
–
–
±8kV HBM
8
±1kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
The TSC2007 is available in
a
12-lead,
(1.555 ±0.055mm) x (2.055 ±0.055mm), 3 x 4 array,
wafer chip-scale package (WCSP), and a 16-pin,
TSSOP package. The TSC2007 is characterized for
the –40°C to +85°C industrial temperature range.
•
1.5 x 2 WCSP-12 and 5 x 6.4 TSSOP-16
Packages
U.S. Patent NO. 6246394; other patents pending.
VDD/REF
PENIRQ
X+
X-
Y+
Y-
Touch
Screen
Drivers
Interface
I2C
Serial
SAR
ADC
SCL
Mux
Interface
and
SDA
TEMP
Control
A[0:1]
AUX
Internal
Clock
GND
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.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TSC2007
www.ti.com
SBAS405–MARCH 2007
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
ORDERING INFORMATION(1)
TYPICAL
INTEGRAL
LINEARITY
(LSB)
TYPICAL
GAIN
ERROR
(LSB)
NO MISSING
CODES
RESOLUTION PACKAGE
SPECIFIED
TEMPERATURE PACKAGE
TRANSPORT
MEDIA,
QUANTITY
PACKAGE
DESIGNATOR
ORDERING
NUMBER
PRODUCT
(BITS)
TYPE
RANGE
MARKING
TSC2007IPW
Tube, 90
16-Pin,
5 x 6.4
TSSOP
PW
–40°C to +85°C
TSC2007I
Tape and
Reel, 2000
TSC2007IPWR
TSC2007I
±1.5
0.1
11
Small Tape
and Reel, 250
12-Pin,
3 x 4 Matrix,
1.5 x 2
TSC2007IYZGT
TSC2007IYZGR
YZG
–40°C to +85°C
TSC2007I
Tape and
Reel, 3000
WCSP
(1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet, or see
the TI website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range (unless otherwise noted)
TSC2007
–0.4 to VDD + 0.1
–0.4 to VDD + 0.1
–0.3 to +5
–0.3 to VDD + 0.3
–0.3 to VDD + 0.3
(TJ Max - TA)/θJA
86
UNIT
Analog input X+, Y+, AUX to GND
Analog input X–, Y– to GND
VDD to GND
V
V
V
V
V
Voltage
Voltage range
Digital input voltage to GND
Digital output voltage to GND
Power dissipation
TSSOP Package
Thermal impedance, θJA
Low-K
WCSP package
113
°C/W
High-K
62
Operating free-air temperature range, TA
Storage temperature range, TSTG
Junction temperature, TJ Max
–40 to +85
–65 to +150
+150
°C
°C
°C
°C
°C
Vapor phase (60 sec)
Infrared (15 sec)
+215
Lead temperature
+220
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated is not implied. Exposure to
absolute-maximum rated conditions for extended periods may affect device reliability.
2
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TSC2007
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SBAS405–MARCH 2007
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, VDD = +1.2V to +3.6V, unless otherwise noted.
TSC2007
TYP
PARAMETER
TEST CONDITIONS
MIN
0
MAX
VDD
+1
UNIT
AUXILIARY ANALOG INPUT
Input voltage range
Input capacitance
Input leakage current
A/D CONVERTER
Resolution
V
12
pF
µA
–1
Programmable: 8 or 12 bits
12
Bits
Bits
No missing codes
Integral linearity
12-bit resolution
11
±1.5
–1.2
–3.1
0.7
LSB(1)
LSB
LSB
LSB
LSB
VDD = 1.8V
VDD = 3.0V
VDD = 1.8V
VDD = 3.0V
Offset error
Gain error
0.1
TOUCH SENSORS
PENIRQ Pull-Up Resistor, RIRQ
TA = +25°C, VDD = 1.8V, command '1011' set '0000'
TA = +25°C, VDD = 1.8V, command '1011' set '0001'
51
90
6
kΩ
kΩ
Ω
Y+, X+
Switch
On-Resistance
Y–, X–
5
Ω
Switch drivers drive current(2)
INTERNAL TEMPERATURE SENSOR
Temperature range
100ms duration
50
mA
–40
+85
°C
VDD = 3V
1.94
1.04
0.35
0.19
±2
°C/LSB
°C/LSB
°C/LSB
°C/LSB
°C/LSB
°C/LSB
°C/LSB
°C/LSB
Differential
method(3)
VDD = 1.6V
Resolution
VDD = 3V
TEMP1(4)
,
VDD = 1.6V
VDD = 3V
Differential
method(3)
VDD = 1.6V
VDD = 3V
±2
Accuracy
±3
TEMP1(4)
VDD = 1.6V
±3
INTERNAL OSCILLATOR
VDD = 1.2V
VDD = 1.8V
VDD = 2.7V
VDD = 3.6V
VDD = 1.2V
VDD = 1.8V
VDD = 2.7V
VDD = 3.6V
3.19
3.66
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
%/°C
%/°C
8-Bit
3.78
3.82
Internal clock frequency, fCCLK
1.6
1.83
12-Bit
1.88
1.91
VDD = 1.6V
VDD = 3.0V
0.0056
0.012
Frequency drift
(1) LSB means Least Significant Bit. With VDD (REF) = +1.6V, one LSB is 391µV.
(2) Assured by design, but not tested. Exceeding 50mA source current may result in device degradation.
(3) Difference between TEMP1 and TEMP2 measurement; no calibration necessary.
(4) Temperature drift is –2.1mV/°C.
3
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TSC2007
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SBAS405–MARCH 2007
ELECTRICAL CHARACTERISTICS (continued)
At TA = –40°C to +85°C, VDD = +1.2V to +3.6V, unless otherwise noted.
TSC2007
TYP
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
DIGITAL INPUT/OUTPUT
Logic family
CMOS
1.2V ≤ VDD < 1.6V
1.6V ≤ VDD ≤ 3.6V
1.2V ≤ VDD < 1.6V
1.6V ≤ VDD ≤ 3.6V
0.7 × VDD
0.7 × VDD
–0.3
VDD + 0.3
V
V
VIH
VIL
VDD + 0.3
0.2 × VDD
V
–0.3
0.3 × VDD
V
IIL
Logic level
CIN
SCL and SDA pins
SCL and SDA pins
IOH = 2 TTL loads
IOL = 2 TTL loads
Floating output
–1
1
10
µA
pF
V
VOH
VDD– 0.2
VDD
0.2
1
VOL
0
V
ILEAK
–1
µA
pF
COUT
Data format
Floating output
10
Straight Binary
POWER-SUPPLY REQUIREMENTS
Power-supply voltage
VDD
Specified performance
1.2
3.6
V
32.56k eq rate
8.2k eq rate
128
32.24
165
190
µA
µA
µA
µA
µA
µA
µA
VDD = 1.2V
12-bit Fast mode
34.42k eq rate
8.2k eq rate
240
335
0.8
Quiescent supply current
(VDD with sensor off)
(clock = 400kHz) VDD = 1.8V
PD[1:0] = 0,0
39.31
226.2
53.32
0
34.79k eq rate
8.2k eq rate
VDD = 2.7V
Power down supply current
Not addressed, SCL =SDA = 1
4
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TSC2007
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SBAS405–MARCH 2007
PIN CONFIGURATION
PW PACKAGE
TSSOP-16
(TOP VIEW)
YZG PACKAGE
WCSP-12
(TOP VIEW, SOLDER BUMPS ON BOTTOM SIDE)
X-
A1
X+
Y+
A0
Y-
AUX
NC
VDD/REF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
3
2
1
X+
Y+
VDD/REF
GND
SCL
A0
A1
X-
TSC2007
SDA
AUX
A
PENIRQ
SCL
SDA
PENIRQ
NC
Y-
GND
NC
NC
B
C
D
Columns
(FRONT VIEW)
PIN ASSIGNMENTS
PIN NO.
TSSOP WCSP
PIN
NAME
VDD/REF
X+
I/O
A/D DESCRIPTION
Supply voltage and external reference input
X+ channel input
1
2
A2
A3
B3
C3
D3
D2
—
I
I
I
I
A
A
A
A
3
Y+
Y+ channel input
X– channel input
Y– channel input
Ground
4
X–
5
Y–
6
GND
NC
7
No connection
No connection
No connection
8
—
NC
9
—
NC
10
11
B1
C1
PENIRQ
SDA
O
D
D
Data available interrupt output. A delayed (process delay) pen touch detect. Pin polarity with active low.
Serial data I/O
I/O
Serial clock. This pin is normally an input, but acts as an output when the device stretches the clock to
delay a bus transfer.
12
D1
SCL
I/O
D
13
14
15
16
C2
B2
—
A1
A0
I
I
D
D
Address input bit 1
Address input bit 0
No connection
NC
A1
AUX
I
A
Auxiliary channel input
5
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SBAS405–MARCH 2007
TIMING INFORMATION
SDA
tSU, STA
tSU, DAT
tBUF
tHD, STA
tHD, DAT
tLOW
tSU, STO
SCL
tHD, STA
tHIGH
tR
tF
START
CONDITION
REPEATED
START
STOP
START
CONDITION
CONDITION
CONDITION
Figure 1. Detailed I/O Timing
TIMING REQUIREMENTS: I2C Standard Mode (SCL = 100kHz)
All specifications typical at –40°C to +85°C, VDD = 1.6V, unless otherwise noted.
2-WIRE STANDARD MODE PARAMETERS
SCL clock frequency
TEST CONDITIONS
MIN
0
TYP
MAX UNIT
fSCL
100 kHz
Bus free time between a STOP and START condition
Hold time (repeated) START condition
Low period of SCL clock
tBUF
4.7
4.0
4.7
4.0
4.7
0
µs
µs
µs
µs
µs
tHD, STA
tLOW
High period of the SCL clock
tHIGH
tSU, STA
tHD, DAT
tSU, DAT
tR
Setup time for a repeated START condition
Data hold time
3.45
µs
ns
Data setup time
250
Rise time for both SDA and SCL clock signals (receiving)
Fall time for both SDA and SCL clock signals (receiving)
Fall time for both SDA and SCL clock signals (transmitting)
Setup time for STOP condition
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
1000
300
ns
tF
ns
tOF
250
ns
tSU, STO
Cb
4.0
µs
Capacitive load for each bus line
Cb = total capacitance of one bus line in pF
40 SCL + 127 CCLK, VDD = 1.8V
49 SCL + 148 CCLK, VDD = 1.8V
VDD = 1.8V
400
pF
8 bits
434.7
570.9
2.3
µs
Cycle time
12 bits
µs
8 bits
kSPS
kSPS
kHz
kHz
Effective throughput
12 bits
VDD = 1.8V
1.75
16.1
12.26
8 bits
Equivalent rate = effective throughput × 7
12 bits
VDD = 1.8V
VDD = 1.8V
6
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SBAS405–MARCH 2007
TIMING REQUIREMENTS: I2C Fast Mode (SCL = 400kHz)
All specifications typical at –40°C to +85°C, VDD = 1.6V, unless otherwise noted.
2-WIRE FAST MODE PARAMETERS
SCL clock frequency
TEST CONDITIONS
MIN
TYP MAX UNIT
fSCL
0
400 kHz
Bus free time between a STOP and START condition
Hold time (repeated) START condition
Low period of SCL clock
tBUF
1.3
µs
µs
µs
µs
µs
tHD, STA
tLOW
0.6
1.3
High period of the SCL clock
tHIGH
tSU, STA
tHD, DAT
tSU, DAT
tR
0.6
Setup time for a repeated START condition
Data hold time
0.6
0
0.9
µs
ns
Data setup time
100
Rise time for both SDA and SCL clock signals (receiving)
Fall time for both SDA and SCL clock signals (receiving)
Cb = total bus capacitance
20+0.1×Cb
20+0.1×Cb
20+0.1×Cb
0.6
300
300
250
ns
tF
Cb = total bus capacitance
Cb = total bus capacitance
ns
Fall time for both SDA and SCL clock signals (transmitting) tOF
ns
Setup time for STOP condition
Capacitive load for each bus line
tSU, STO
Cb
µs
Cb = total capacitance of one bus line in pF
40 SCL + 127 CCLK, VDD = 1.8V
49 SCL + 148 CCLK, VDD = 1.8V
VDD = 1.8V
400
pF
8 bits
134.7
203.4
7.42
µs
Cycle time
12 bits
8 bits
µs
kSPS
kSPS
kHz
kHz
Effective throughput
12 bits
8 bits
VDD = 1.8V
4.92
VDD = 1.8V
51.97
34.42
Equivalent rate = effective throughput × 7
12 bits
VDD = 1.8V
TIMING REQUIREMENTS: I2C High-Speed Mode (SCL = 1.7MHz)
All specifications typical at –40°C to +85°C, VDD = 1.6V, unless otherwise noted.
2-WIRE HIGH-SPEED MODE PARAMETERS
SCL clock frequency
TEST CONDITIONS
MIN
0
TYP MAX UNIT
fSCL
1.7 MHz
Hold time (repeated) START condition
Low period of SCL clock
tHD, STA
tLOW
tHIGH
tSU, STA
tHD, DAT
tSU, DAT
tR
160
320
120
160
0
ns
ns
ns
ns
High period of the SCL clock
Setup time for a repeated START condition
Data hold time
150
ns
ns
Data setup time
10
Rise time for SCL clock signal (receiving)
Rise time for SDA clock signal (receiving)
Fall time for SCL clock signal (receiving)
Fall time for SDA clock signal (receiving)
Fall time for both SDA and SCL clock signals (transmitting)
Setup time for STOP condition
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
20
80
160
80
ns
tR
20
ns
tF
20
ns
tF
20
160
80
ns
tOF
10
ns
tSU, STO
Cb
160
ns
Capacitive load for each bus line
Cb = total capacitance of one bus line in pF
40 SCL + 127 CCLK, VDD = 1.8V
49 SCL + 148 CCLK, VDD = 1.8V
VDD = 1.8V
400
pF
8 bits
58.2
109.7
17.17
9.12
µs
Cycle time
12 bits
µs
8 bits
kSPS
kSPS
kHz
kHz
Effective throughput
12 bits
VDD = 1.8V
8 bits
Equivalent rate = effective throughput × 7
12 bits
VDD = 1.8V
120.22
63.81
VDD = 1.8V
7
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SBAS405–MARCH 2007
TIMING REQUIREMENTS: I2C High-Speed Mode (SCL = 3.4MHz)
All specifications typical at –40°C to +85°C, VDD = 1.6V, unless otherwise noted.
2-WIRE HIGH-SPEED MODE PARAMETERS
SCL clock frequency
TEST CONDITIONS
MIN
0
TYP MAX UNIT
fSCL
3.4 MHz
Hold time (repeated) START condition
Low period of SCL clock
tHD, STA
tLOW
tHIGH
tSU, STA
tHD, DAT
tSU, DAT
tR
160
160
60
ns
ns
ns
ns
High period of the SCL clock
Setup time for a repeated START condition
Data hold time
160
0
70
ns
ns
ns
Data setup time
10
Rise time for SCL clock signal (receiving)
Rise time for SDA clock signal (receiving)
Fall time for SCL clock signal (receiving)
Fall time for SDA clock signal (receiving)
Fall time for both SDA and SCL clock signals (transmitting)
Setup time for STOP condition
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
Cb = total bus capacitance
10
40
80
40
80
80
tR
10
tF
10
ns
tF
10
tOF
10
ns
ns
tSU, STO
Cb
160
Capacitive load for each bus line
Cb = total capacitance of one bus line in pF
40 SCL + 127 CCLK, VDD = 1.8V
49 SCL + 148 CCLK, VDD = 1.8V
VDD = 1.8V
100
pF
8 bits
46.5
95.3
µs
Cycle time
12 bits
µs
8 bits
21.52
10.49
150.65
73.46
kSPS
kSPS
kHz
kHz
Effective throughput
12 bits
VDD = 1.8V
8 bits
Equivalent rate = effective throughput × 7
12 bits
VDD = 1.8V
VDD = 1.8V
8
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SBAS405–MARCH 2007
TYPICAL CHARACTERISTICS
At TA = –40°C to +85°C, VDD = +1.2V to +3.6V, PD1 = PD0 = 0, Fast mode, 12-bit mode, and non-continuous AUX
measurement, unless otherwise noted.
POWER-DOWN SUPPLY CURRENT
vs TEMPERATURE
SUPPLY CURRENT
vs TEMPERATURE
100
80
60
40
20
0
350
300
250
200
150
100
50
High-Speed Mode = 3.4MHz
VDD = 3.0V
VDD = 3.6V
Fast Mode = 400kHz
VDD = 1.6V
Standard Mode = 100kHz
0
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 2.
Figure 3.
SUPPLY CURRENT
AUX CONVERSION
SUPPLY CURRENT
vs SUPPLY VOLTAGE
600
500
400
300
200
100
0
300
250
200
150
100
50
TA = +25°C
I2C Speed = 400kHz
High-Speed Mode = 3.4MHz
PD1 = PD0 = 0
X, Y, Z Conversion at 200SSPS
Fast Mode = 400kHz
with MAV
MAV Bypassed
Touch Sensor Modeled By:
2kW for X-Plane
Standard Mode = 100kHz
2kW for Y-Plane
1kW for Z(Touch Resistance)
0
3.6
3.6
1.2
1.6
2.0
2.4
2.8
3.2
1.2
1.6
2.0
2.4
2.8
3.2
VDD (V)
VDD (V)
Figure 4.
Figure 5.
SUPPLY CURRENT (Part Not Addressed)
vs TEMPERATURE
SUPPLY CURRENT (Part Not Addressed)
vs SUPPLY VOLTAGE
70
60
50
40
30
20
10
0
250
200
150
100
50
High-Speed Mode = 3.4MHz
High-Speed Mode = 3.4MHz
Standard Mode = 100kHz
Fast Mode = 400kHz
Fast Mode = 400kHz
Standard Mode = 100kHz
0
-40
-20
0
20
40
60
80
100
1.2
1.6
2.0
2.4
2.8
3.2
3.6
Temperature (°C)
VDD (V)
Figure 6.
Figure 7.
9
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SBAS405–MARCH 2007
TYPICAL CHARACTERISTICS (continued)
At TA = –40°C to +85°C, VDD = +1.2V to +3.6V, PD1 = PD0 = 0, Fast mode, 12-bit mode, and non-continuous AUX
measurement, unless otherwise noted.
CHANGE IN GAIN
vs TEMPERATURE
CHANGE IN OFFSET
vs TEMPERATURE
6
4
6
4
VDD = 1.8V
VDD = 1.8V
2
2
0
0
-2
-4
-6
-2
-4
-6
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 8.
Figure 9.
SWITCH ON-RESISTANCE
vs SUPPLY VOLTAGE
SWITCH ON-RESISTANCE
vs TEMPERATURE
6
5
4
3
2
11
10
9
X+, Y+: VDD = 3.0V to Pin
X-, Y-: Pin to GND
Y+
Y-
8
X+
7
X-
Y-
6
Y+
5
X-
4
X+
3
3.6
-40
-20
0
20
40
60
80
100
1.2
1.6
2.0
2.4
2.8
3.2
VDD (V)
Temperature (°C)
Figure 10.
Figure 11.
SWITCH ON-RESISTANCE
vs TEMPERATURE
TEMP DIODE VOLTAGE
vs TEMPERATURE
8
7
6
5
4
3
2
850
800
750
700
650
600
550
500
450
400
Measurement Includes
A/D Converter Offset
and Gain Errors
X+, Y+: VDD = 1.8V to Pin
Y+
X-, Y-: Pin to GND
TEMP2
94.2mV
Y-
X+
X-
137.5mV
TEMP1
VDD = 1.8V
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 12.
Figure 13.
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TYPICAL CHARACTERISTICS (continued)
At TA = –40°C to +85°C, VDD = +1.2V to +3.6V, PD1 = PD0 = 0, Fast mode, 12-bit mode, and non-continuous AUX
measurement, unless otherwise noted.
TEMP1 DIODE VOLTAGE
vs SUPPLY VOLTAGE
TEMP2 DIODE VOLTAGE
vs SUPPLY VOLTAGE
588
586
584
582
580
578
576
574
704
702
700
698
696
694
692
690
Measurement Includes
Measurement Includes
A/D Converter Offset
and Gain Errors
A/D Converter Offset
and Gain Errors
VDD = VREF
VDD = VREF
1.2
1.6
2.0
2.4
2.8
3.2
3.6
1.2
1.6
2.0
2.4
2.8
3.2
3.6
VDD (V)
VDD (V)
Figure 14.
Figure 15.
INTERNAL OSCILLATOR CLOCK FREQUENCY
vs TEMPERATURE
INTERNAL OSCILLATOR CLOCK FREQUENCY
vs TEMPERATURE
3.40
3.30
3.20
3.10
3.00
2.90
2.80
2.70
3.70
3.65
3.60
VDD = 1.2V
VDD = 1.8V
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 16.
Figure 17.
INTERNAL OSCILLATOR CLOCK FREQUENCY
vs TEMPERATURE
3.90
3.85
3.80
3.75
3.70
VDD = 3.0V
-40
-20
0
20
40
60
80
100
Temperature (°C)
Figure 18.
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OVERVIEW
The TSC2007 is an analog interface circuit for a human interface touch screen device. All peripheral functions
are controlled through the command byte and onboard state machines. The TSC2007 features include:
•
•
•
•
•
•
•
Very low-power touch screen controller
Very small onboard footprint
Relieves host from tedious routine tasks by preprocessing, thus saving resources for more critical tasks
Ability to work on very low supply voltage
Minimal connection interface allows easiest isolation and reduces the number of dedicated I/O pins required
Miniature, yet complete; requires no external supporting component.
Enhanced ESD
The TSC2007 consists of the following blocks (refer to the block diagram on the front page):
•
•
•
•
•
•
Touch Screen Sensor Interface
Auxiliary Input (AUX)
Temperature Sensor
Acquisition Activity Preprocessing
Internal Conversion Clock
I2C Interface
Communication with the TSC2007 is done via an I2C serial interface. The TSC2007 is an I2C slave device;
therefore, data is shifted into or out of the TSC2007 under control of the host microprocessor, which also
provides the serial data clock.
Control of the TSC2007 and its functions is accomplished by writing to the command register of an internal state
machine. A simple command protocol compatible with I2C is used to address this register.
A typical application of the TSC2007 is shown in Figure 19.
1.8VDC
1mF
0.1mF
1.2kW
1.2kW
Host
GND
Processor
PENIRQ
GPIO
X+
Y+
X-
Y-
SDA
SCL
TSC2007
SDA
SCL
Touch
Screen
Auxilary Input
GND
Figure 19. Typical Circuit Configuration
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OVERVIEW (continued)
TOUCH SCREEN OPERATION
A resistive touch screen operates by applying a voltage across a resistor network and measuring the change in
resistance at a given point on the matrix where the screen is touched by an input (stylus, pen, or finger). The
change in the resistance ratio marks the location on the touch screen.
The TSC2007 supports the resistive 4-wire configurations, as shown in Figure 20. The circuit determines
location in two coordinate pair dimensions, although a third dimension can be added for measuring pressure.
4-WIRE TOUCH SCREEN COORDINATE PAIR MEASUREMENT
A 4-wire touch screen is typically constructed as shown in Figure 20. It consists of two transparent resistive
layers separated by insulating spacers.
Conductive Bar
Transparent Conductor (ITO)
Bottom Side
Y+
X+
Silver
Transparent
Conductor (ITO)
Top Side
Ink
X-
Y-
Insulating Material (Glass)
ITO = Indium Tin Oxide
Figure 20. 4-Wire Touch Screen Construction
The 4-wire touch screen panel works by applying a voltage across the vertical or horizontal resistive network.
The A/D converter converts the voltage measured at the point where the panel is touched. A measurement of
the Y position of the pointing device is made by connecting the X+ input to a data converter chip, turning on the
Y+ and Y– drivers, and digitizing the voltage seen at the X+ input. The voltage measured is determined by the
voltage divider developed at the point of touch. For this measurement, the horizontal panel resistance in the X+
lead does not affect the conversion because of the high input impedance of the A/D converter.
Voltage is then applied to the other axis, and the A/D converter converts the voltage representing the X position
on the screen. This process provides the X and Y coordinates to the associated processor.
Measuring touch pressure (Z) can also be done with the TSC2007. To determine pen or finger touch, the
pressure of the touch must be determined. Generally, it is not necessary to have very high performance for this
test; therefore, 8-bit resolution mode may be sufficient (however, data sheet calculations will be shown with the
12-bit resolution mode). There are several different ways of performing this measurement. The TSC2007
supports two methods. The first method requires knowing the X-plate resistance, the measurement of the
X-Position, and two additional cross panel measurements (Z2 and Z1) of the touch screen (see Figure 21).
Equation 1 calculates the touch resistance:
XPostition Z2
ǒ Ǔ
RTOUCH + RX−plate
@
* 1
4096
Z1
(1)
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OVERVIEW (continued)
The second method requires knowing both the X-plate and Y-plate resistance, measurement of X-Position and
Y-Position, and Z1. Equation 2 also calculates the touch resistance:
RX−plate @ XPostition
YPosition
4096
4096
Z1
ǒ Ǔ ǒ1* Ǔ
RTOUCH
+
*1 *RY−plate
@
4096
(2)
Measure X-Position
X+
Y+
Touch
X-Position
X-
Y-
Measure Z1-Position
Y+
X+
Touch
Z1-Position
X-
Y-
Y+
X+
Touch
Z2-Position
X-
Y-
Measure Z2-Position
Figure 21. Pressure Measurement
When the touch panel is pressed or touched and the drivers to the panel are turned on, the voltage across the
touch panel will often overshoot and then slowly settle down (decay) to a stable DC value. This effect is a result
of mechanical bouncing caused by vibration of the top layer sheet of the touch panel when the panel is pressed.
This settling time must be accounted for, or else the converted value will be in error. Therefore, a delay must be
introduced between the time the driver for a particular measurement is turned on, and the time a measurement
is made.
In some applications, external capacitors may be required across the touch screen for filtering noise picked up
by the touch screen (for example, noise generated by the LCD panel or back-light circuitry). The value of these
capacitors provides a low-pass filter to reduce the noise, but will cause an additional settling time requirement
when the panel is touched. The setlling time will typically show up as gain error.
To solve this problem, the TSC2007 can be commanded to turn on the drivers only, without performing a
conversion. Time can then be allowed to perform a conversion before the command is issued.
The TSC2007 touch screen interface can measure position (X,Y) and pressure (Z).
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OVERVIEW (continued)
INTERNAL TEMPERATURE SENSOR
In some applications, such as battery recharging, an ambient temperature measurement is required. The
temperature measurement technique used in the TSC2007 relies on the characteristics of a semiconductor
junction operating at a fixed current level. The forward diode voltage (VBE) has a well-defined characteristic
versus temperature. The ambient temperature can be predicted in applications by knowing the +25°C value of
the VBE voltage and then monitoring the delta of that voltage as the temperature changes.
The TSC2007 offers two modes of temperature measurement. The first mode requires calibration at a known
temperature, but only requires a single reading to predict the ambient temperature. The TEMP1 diode, shown in
Figure 22, is used during this measurement cycle. This voltage is typically 580mV at +25°C with a 10µA current.
The absolute value of this diode voltage can vary by a few millivolts; the temperature coefficient (TC) of this
voltage is very consistent at –2.1mV/°C. During the final test of the end product, the diode voltage would be
stored at a known room temperature, in system memory, for calibration purposes by the user. The result is an
equivalent temperature measurement resolution of 0.35°C/LSB (1LSB = 732µV with VREF = 3.0V).
VDD
+IN
Converter
-IN
GND
Figure 22. Functional Block Diagram of Temperature Measurement Mode
The second mode does not require a test temperature calibration, but uses a two-measurement (differential)
method to eliminate the need for absolute temperature calibration and for achieving 2°C/LSB accuracy. This
mode requires a second conversion of the voltage across the TEMP2 diode with a resistance 80 times larger
than the TEMP1 diode. The voltage difference between the first (TEMP1) and second (TEMP2) conversion is
represented by:
kT
q
DV +
@ ln(N)
(3)
Where:
N = the resistance ratio = 80.
k = Boltzmann's constant = 1.3807 × 10-23 J/K (joules/kelvins).
q = the electron charge = 1.6022 × 10-19 C (coulombs).
T = the temperature in kelvins (K).
This method can provide much improved absolute temperature measurement, but a lower resolution of
1.6°C/LSB. The resulting equation to solve for T is:
q @ DV
k @ ln(N)
T +
(4)
Where:
∆V = VBE (TEMP2) – VBE(TEMP1) (in mV)
T = 2.648 ∆V (in K)
or T = 2.648 ∆V – 273 (in °C)
Temperature 1 and temperature 2 measurements have the same timing as Figure 33 and Figure 34.
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OVERVIEW (continued)
ANALOG-TO-DIGITAL CONVERTER
Figure 23 shows the analog inputs of the TSC2007. The analog inputs (X, Y, and Z touch panel coordinates,
chip temperature and auxiliary inputs) are provided via a multiplexer to the Successive Approximation Register
(SAR) Analog-to-Digital (A/D) converter. The A/D architecture is based on capacitive redistribution architecture,
which inherently includes a sample-and-hold function.
VDD/REF
PENIRQ
RIRQ
50kW
90kW
Pen Touch
Control
Logic
MAV
C3-C0
GND
X+
X-
VDD
Y+
+REF
+IN
Y-
Converter
-IN
-REF
GND
AUX
GND
Figure 23. Simplified Diagram of the Analog Input Section
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 converter and a differential reference input architecture, it is possible to negate errors
caused by the driver switch on-resistances.
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OVERVIEW (continued)
Reference
The TSC2007 uses an external voltage reference that is applied to the VDD/REF pin. The upper reference
voltage range is the same as the supply voltage range, which allows for simple, 1.2V to 3.6V single-supply
operation of the chip.
Reference Mode
There is a critical item regarding the reference when making measurements while the switch drivers are on. For
this discussion, it is useful to consider the basic operation of the TSC2007 (see Figure 19). This particular
application shows the device being used to digitize a resistive touch screen. A measurement of the current Y
position of the pointing device is made by connecting the X+ input to the A/D converter, turning on the Y+ and
Y– drivers, and digitizing the voltage on X+, as shown in Figure 24. For this measurement, the resistance in the
X+ lead does not affect the conversion; it does affect the settling time, but the resistance is usually small enough
that this is not a concern. However, because the resistance between Y+ and Y– is fairly low, the on-resistance of
the Y drivers does make a small difference. Under the situation outlined so far, it would not be possible to
achieve a 0V input or a full-scale input regardless of where the pointing device is on the touch screen because
some voltage is lost across the internal switches. In addition, the internal switch resistance is unlikely to track the
resistance of the touch screen, providing an additional source of error. The TSC2007 does not support
single-ended reference mode.
VDD/REF
Y+
+REF
+IN
X+
Converter
-IN
-REF
Y-
GND
Figure 24. Simplified Diagram of Single-Ended Reference
This situation is remedied, as shown in Figure 25, by using the differential mode; the +REF and –REF inputs are
connected directly to Y+ and Y–, respectively. This makes the A/D converter ratiometric. The result of the
conversion is always a percentage of the external reference, regardless of how it changes in relation to the
on-resistance of the internal switches.
VDD/REF
Y+
+REF
+IN
X+
Converter
-IN
-REF
Y-
GND
Figure 25. Simplified Diagram of Differential Reference
(Y Switches Enabled, X+ is Analog Input)
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OVERVIEW (continued)
Touch Screen Settling
In some applications, external capacitors may be required across the touch screen to filter noise picked up by
the touch screen (that is, noise generated by the LCD panel or backlight circuitry). These capacitors provide a
low-pass filter to reduce the noise, but they also cause a settling time requirement when the panel is touched.
The settling time will typically show up as a gain error. The problem is that the input and/or reference has not
settled to its final steady-state value prior to the A/D converter sampling the input(s), and providing the digital
output. Additionally, the reference voltage may still be changing during the measurement cycle.
To resolve these settling-time problems, the TSC2007 can be commanded to turn on the drivers only without
performing a conversion (see Table 3). Time can then be allowed, before the command is issued, to perform a
conversion. Generally, the time it takes to communicate the conversion command over the I2C bus is adequate
for the touch screen to settle.
Variable Resolution
The TSC2007 provides either 8-bit or 12-bit resolution for the A/D converter. Lower resolution is often practical
for measuring slow changing signals such as touch pressure. Performing the conversions at lower resolution
reduces the amount of time it takes for the A/D converter to complete its conversion process, which also lowers
power consumption.
8-Bit Conversion
The TSC2007 provides an 8-bit conversion mode (M = 1) that can be used when faster throughput is needed,
and the digital result is not as critical (for example, measuring pressure). By switching to the 8-bit mode, a
conversion result can be read by transferring only one data byte. The internal clock will run twice as fast at
4MHz.
The faster clock shortens each conversion by four bits and reduces data transfer time, which results in fewer
clock cycles and provides lower power consumption.
Conversion Clock and Conversion Time
The TSC2007 contains an internal 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 that runs the A/D converter.
The frequency of this clock is 4MHz clock for 8-bit mode, and 2MHz for the 12-bit mode.
Data Format
The TSC2007 output data is in Straight Binary format as shown in Figure 26. This figure shows the ideal output
code for the given input voltage and does not include the effects of offset, gain, or noise.
(1)
FS = Full-Scale Voltage = VREF
1LSB = VREF(1)/4096
1LSB
11...111
11...110
11...101
00...010
00...001
00...000
0V
FS - 1LSB
Input Voltage(2) (V)
(1) Reference voltage at converter: +REF – (–REF). See Figure 23.
(2) Input voltage at converter, after multiplexer: +IN – (–IN). See Figure 23.
Figure 26. Ideal Input Voltages and Output Codes
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OVERVIEW (continued)
Touch Detect
The PENIRQ can be used as an interrupt to the host. RIRQ is an internal pull up with a programmable value of
either 50kΩ (default) or 90kΩ. Write command '1011' (setup command) followed by data '0001' sets the pullup to
90kΩ. NOTE: The first three bits must be '0's and the select bit is the last bit. To change the pullup back to
50kΩ, issue write command '1011' followed by data '0000'.
An example for the Y-position measurement is detailed in Figure 27. The PENIRQ output is pulled high by an
internal pullup. While in power-down mode with PD0 = 0, 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 pulled to ground
through the touch screen, and PENIRQ output goes low because of the current path through the panel to GND,
initiating an interrupt to the processor. During the measurement cycle for X-, Y-, and Z-Position, the X+ input is
disconnected from the PENIRQ pull-down transistor to eliminate any pull-up resistor leakage current from
flowing through the touch screen, thus causing no errors.
In addition to the measurement cycles for X-, Y-, and Z-Position, commands that activate the X-drivers,
Y-drivers, and Y+ and X-drivers without performing a measurement, also disconnect the X+ input from the
PENIRQ pull-down transistor and disable the pen-interrupt output function, regardless of the value of the PD0
bit. Under these conditions, the PENIRQ output will be forced low. Furthermore, if the last command byte written
to the TSC2007 contains PD0 = 1, the pen-interrupt output function will be disabled and will not be able to detect
when the panel is touched. In order to re-enable the pen-interrupt output function under these circumstances, a
command byte must be written to the TSC2007 with PD0 = 0.
When the bus master sends the address byte with R/W bit = 0, and the TSC2007 sends an acknowledge, the
pen-interrupt function is disabled. If the command that follows the address byte contains PD0 = 0, then the
pen-interrupt function will be enabled at the end of a conversion. This is approximately 100µs (12-bit mode) or
50µs (8-bit mode) after the TSC2007 receives a STOP/START condition, following the receipt of a command
byte (see Figure 31 and Figure 30 for further details about when the conversion cycle begins).
In both cases previously listed, it is recommended that whenever the host writes to the TSC2007, the master
processor masks the interrupt associated to PENIRQ. This masking prevents false triggering of interrupts when
the PENIRQ line is disabled in the cases previously listed.
Connect to
Analog Supply
VDD/REF
PENIRQ
VDD
RIRQ
Y+
X+
Pen Touch
Control
Logic
High when
the X+ or Y+
driver is on.
Sense
GND
Y-
High when the X+ or Y+
driver is on, or when any
sensor connection/short-
circuit tests are activated.
ON
Vias go to system analog ground plane.
GND
GND
Figure 27. Example of a Pen-Touch Induced Interrupt via the PINTDAV Pin
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OVERVIEW (continued)
Preprocessing
The TSC2007 has a combined MAV filter (median value filter and averaging filter).
MAV Filter
In case the acquired signal source is noisy because of the digital switching circuit, it may necessary to evaluate
the data without noise. In this case, the median value filter operation helps remove the noise. The array of seven
converted results is sorted first. The middle three values are then averaged to produce the output value of the
MAV filter.
The MAV filter is applied to all measurments for all analog inputs including the touch screen inputs, temperature
measurements TEMP1 and TEMP2, and auxiliary input AUX. To shorten the conversion time, the MAV filter may
be bypassed though the setup command; see Table 3 and Table 4.
7 Acquired
Data
7 measurements input
into temporary array
Sort by
descending order
Averaging output
from window of 3
3
7
7
Figure 28. MAV Filter Operation
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OVERVIEW (continued)
I2C INTERFACE
The TSC2007 supports the I2C serial bus and data transmission protocol in all three defined modes: standard,
fast, and high-speed. A device that sends data onto the bus is defined as a transmitter, and a device receiving
data as a receiver. The device that controls the message is called a master. The devices that are controlled by
the master are slaves. The bus must be controlled by a master device that generates the serial clock (SCL),
controls the bus access, and generates the START and STOP conditions. The TSC2007 operates as a slave on
the I2C bus. Connections to the bus are made via the open-drain I/O lines, SDA and SCL.
The following bus protocol has been defined (see Figure 29):
•
•
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data
line while the clock line is HIGH will be interpreted as control signals.
Accordingly, the following bus conditions have been defined:
Bus Not Busy
Both data and clock lines remain HIGH.
Start Data Transfer
A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a
START condition.
Stop Data Transfer
A change in the state of the data line, from LOW to HIGH, while the clock line is HIGH, defines the
STOP condition.
Data Valid
The state of the data line represents valid data, when, after a START condition, the data line is
stable for the duration of the HIGH period of the clock signal. There is one clock pulse per bit of
data.
Each data transfer is initiated with a START condition and terminated with a STOP condition. The
number of data bytes transferred between START and STOP conditions is not limited and is
determined by the master device. The information is transferred byte-wise and each receiver
acknowledges with a ninth-bit.
Within the I2C bus specifications, a standard mode (100kHz clock rate), a fast mode (400kHz clock
rate), and a high-speed mode (1.7MHz or 3.4MHz clock rate) are each defined. The TSC2007
works in all three modes.
Acknowledge
Each receiving device, when addressed, is obliged to generate an acknowledge after the reception
of each byte. The master device must generate an extra clock pulse that is associated with this
acknowledge bit.
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in
such a way that the SDA line is stable LOW during the HIGH period of the acknowledge clock
pulse. Of course, setup and hold times must be taken into account. A master must signal an end of
data to the slave by not generating an acknowledge bit on the last byte that has been clocked out
of the slave. In this case, the slave must leave the data line HIGH to enable the master to generate
the STOP condition.
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OVERVIEW (continued)
Figure 29 details how data transfer is accomplished on the I2C bus. Depending upon the state of the R/W bit,
two types of data transfer are possible:
1. Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is
the slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after the
slave address and each received byte.
2. Data transfer from a slave transmitter to a master receiver. The first byte, the slave address, is
transmitted by the master. The slave then returns an acknowledge bit. Next, a number of data bytes are
transmitted by the slave to the master. The master returns an acknowledge bit after all received bytes
other than the last byte. At the end of the last received byte, a not-acknowledge is returned.
The master device generates all of the serial clock pulses and the START and STOP conditions. A transfer ends
with a STOP condition or a repeated START condition. Because a repeated START condition is also the
beginning of the next serial transfer, the bus will not be released.
The TSC2007 may operate in the following two modes:
1. Slave Receiver Mode: Serial data and clock are received through SDA and SCL. After each byte is
received, an acknowledge bit is transmitted. START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address recognition is performed by hardware after reception of
the slave address and direction bit.
2. Slave Transmitter Mode: The first byte (the slave address) is received and handled as in the slave
receiver mode. However, in this mode the direction bit indicates that the transfer direction is reversed.
Serial data is transmitted on SDA by the TSC2007 while the serial clock is input on SCL. START and
STOP conditions are recognized as the beginning and end of a serial transfer.
I2C Fast or Standard Mode (F/S Mode)
In I2C Fast or Standard (F/S) mode, serial data transfer must meet the timing shown in the Timing Information
section.
In the serial transfer format of F/S mode, the master signals the beginning of a transmission to a slave with a
START condition (S), which is a high-to-low transition on the SDA input while SCL is high. When the master has
finished communicating with the slave, the master issues a STOP condition (P), which is a low-to-high transition
on SDA while SCL is high, as shown in Figure 29. The bus is free for another transmission after a stop condition
has occurred. Figure 29 shows the complete F/S mode transfer on the I2C, 2-wire serial interface. The address
byte, control byte, and data byte are transmitted between the START and STOP conditions. The SDA state is
only allowed to change while SCL is low, except for the START and STOP conditions. Data are transmitted in
8-bit words. Nine clock cycles are required to transfer the data into or out of the device (8-bit word plus
acknowledge bit).
SDA
MSB
Slave Address
R/W
Direction Bit
Acknowledgement
Signal from Receiver
Acknowledgement
Signal from Receiver
1
2
6
7
8
9
1
2
3-8
8
9
SCL
ACK
ACK
START
Condition
STOP Condition
or Repeated
START Condition
Repeated If More Bytes Are Transferred
Figure 29. Complete Fast- or Standard-Mode Transfer
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OVERVIEW (continued)
I2C High-Speed Mode (Hs Mode)
The TSC2007 can operate with high-speed I2C masters. To do so, the pull-up resistor on SCL must be changed
to an active pull-up, as recommended in the I2C specification.
Serial data transfer format in High-Speed (Hs) mode meets the Fast or Standard (F/S) mode I2C bus
specification. Hs mode can only commence after the following conditions (all of which are in F/S mode) exist:
1. START condition (S)
2. 8-bit master code (00001xxx)
3. Not-acknowledge bit (N)
Figure 30 shows this sequence in more detail. Hs-mode master codes are reserved 8-bit codes used only for
triggering Hs mode, and are not to be used for slave addressing or any other purpose. The master code
indicates to other devices that an Hs-mode transfer is about to begin and the connected devices must meet the
Hs mode specification. Because no device is allowed to acknowledge the master code, the master code is
followed by a not-acknowledge bit (N).
After the not-acknowledge bit (N) and SCL have been pulled-up to a HIGH level, the master switches to
Hs-mode and enables the current-source pull-up circuit for SCL (at time tH; shown in Figure 30). Because other
devices can delay the serial transfer before tH by stretching the LOW period of SCL, the master enables the
current-source pull-up circuit when all devices have released SCL, and SCL has reached a HIGH level, thus
speeding up the last part of the rise time of the SCL.
The master then sends a repeated START condition (Sr) followed by a 7-bit slave address with a R/W bit
address, and receives an acknowledge bit (A) from the selected slave. After a repeated START (Sr) condition
and after each acknowledge bit (A) or not-acknowledge bit (N), the master disables its current-source pull-up
circuit. This disabling enables other devices, such as the TSC2007, to delay the serial transfer (until the
converted data are stored in the TSC internal shift register) by stretching the LOW period of SCL. The master
re-enables its current-source pull-up circuit again when all devices have released, and SCL reaches a HIGH
level, which speeds up the last part of the SCL signal rise time.
Data transfer continues in Hs mode after the next repeated START (Sr), and only switches back to F/S mode
after a STOP condition (P). To reduce the overhead of the master code, it is possible for the master to link a
number of Hs mode transfers, separated by repeated START conditions (Sr).
8-Bit Master Code 00001xxx
N
tH
S
SDA
SCL
1
2 to 5
6
7
8
9
Fast or Standard Mode
R/W
A
n x (8-Bit DATA
+
A/N)
7-Bit Slave Address
Sr
Sr P
SDA
SCL
1
2 to 5
6
7
8
9
1
2 to 5
6
7
8
9
If P then
Fast or Standard Mode
High-Speed Mode
If Sr (dotted lines)
then High-Speed Mode
A = Acknowledge (SDA LOW)
= Current Source Pull-Up
= Resistor Pull-Up
tH
N = Not Acknowledge (SDA HIGH)
S = START Condition
P = STOP Condition
tFS
Sr = Repeated START Condition
Figure 30. Complete High-Speed Mode Transfer
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DIGITAL INTERFACE
ADDRESS BYTE
The TSC2007 has a 7-bit slave address word. The first five bits (MSBs) of the slave address are factory-preset
to comply with the I2C standard for A/D converters and are always set at '10010'. The logic state of the address
input pins (A1-A0) determine the two LSBs of the device address to activate communication. Therefore, a
maximum of four devices with the same preset code can be connected on the same bus at one time.
The A1-A0 address inputs are read whenever an address byte is received, and should be connected to the
supply (VDD), or the ground (GND). The slave address is latched into the TSC2007 on the falling edge of SCL
after the read/write bit has been received by the slave.
The last bit of the address byte (R/W) defines the operation to be performed. When set to a '1', a read operation
is selected; when set to a ‘0’, a write operation is selected. Following the START condition, the TSC2007
monitors the SDA bus, checking the device type identifier being transmitted. Upon receiving the '10010' code,
the appropriate device select bits, and the R/W bit, the slave device outputs an acknowledge signal on the SDA
line.
Table 1. I2C Slave Address Byte
MSB
D7
LSB
D0
D6
D5
D4
D3
D2
D1
1
0
0
1
0
A1
A0
R/W
Bit D0: R/W
1: I2C master read from TSC (I2C read addressing).
0: I2C master write to TSC (I2C write addressing).
COMMAND BYTE
Table 2. Command Byte Definition (Excluding the Setup Command)(1)
BIT
NAME
DESCRIPTION
D7-D4
C3-C0
All Converter Function Select bits as detailed in Table 3, except for the setup command ('1011').
00: Power down between cycles. PENIRQ enabled.
01: A/D converter on. PENIRQ disabled.
10: A/D converter off. PENIRQ enabled.
11: A/D converter on. PENIRQ disabled.
D3-D2
PD1-PD0
0: 12-bit (Lower speed referred to as the 2MHz clock).
1: 8-bit (Higher speed referred to as the 4MHz clock).
D1
D0
M
X
Don't care.
(1) The command byte definition for the setup command is shown in Table 4.
Bits D7-D4: C3-C0—Converter function select bits. These bits select the input to be converted and the
converter function to be executed, activate the drivers, and configure the PENIRQ pullup resitor (RIRQ). Table 3
lists the possible converter functions.
Bits D3-D2: PD1-PD0—Power-down bits. These two bits select the power-down mode that the TSC2007 will be
in after the current command completes, as shown in Table 2.
It is recommended to set PD0 = 0 in each command byte to get the lowest power consumption possible. If
multiple X-, Y-, and Z-position measurements will be done one right after another (such as when averaging),
PD0 =1 will leave the touch screen drivers on at the end of each conversion cycle.
Bit D1: M—Mode bit. If M = 0, the TSC2007 is in 12-bit mode. If M = 1, 8-bit mode is selected.
Bit D0: X—Don’t care.
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When the TSC2007 powers up, the power-down bits must be written to ensure that the device is placed into the
mode that achieves the lowest power. Therefore, immediately after power-up, send a command byte that sets
PD1 = PD0 = 0, so that the device will be in the lowest power mode, powering down between conversions.
Table 3. Converter Function Select
INPUT TO
A/D
CONVERTER
REFERENCE
MODE
C3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
C2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
C1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
C0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
Measure TEMP0
Reserved
X-DRIVERS
OFF
Y-DRIVERS
OFF
ACK
Y
TEMP0
N/A
AUX
N/A
TEMP1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Y+
Single-Ended
Single-Ended
Single-Ended
Single-Ended
Single-Ended
Single-Ended
Single-Ended
Single-Ended
Differential
Differential
Differential
N/A
OFF
OFF
N
Y
Measure AUX
OFF
OFF
Reserved
OFF
OFF
N
Y
Measure TEMP1
Reserved
OFF
OFF
OFF
OFF
N
N
N
Y
Reserved
OFF
OFF
Reserved
OFF
OFF
Activate X-drivers
Activate Y-drivers
Activate Y+, X-drivers
Setup command(1)
Measure X position
Measure Y position
Measure Z1 position
Measure Z2 position
ON
OFF
OFF
ON
Y
X– ON
OFF
Y+ ON
OFF
Y
N
Y
ON
OFF
Differential
Differential
Differential
Differential
X+
OFF
ON
Y
X+
X– ON
X– ON
Y+ ON
Y+ ON
Y
Y–
Y
(1) The setup command has an additional four bits of data. These data are static; that is, they are not changed by other commands, except
for the power-on reset. The default value for these bits after power-on reset is 0000. Table 4 shows the definition of these data bits.
Table 4. Command Byte Definition for the Setup Command
BIT
NAME
DESCRIPTION
D7-D4
D3-D2
C3-C0 = '1011'
PD1-PD0 = '00'
Setup command; must write '1011'.
Reserved; must write '00'.
0: Use the onboard MAV filter (default).
1: Bypass the onboard MAV filter.
D1
D0
Filter control
0: RIRQ = 50kΩ (default).
1: RIRQ = 90kΩ.
PENIRQ pullup resistor (RIRQ) select
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START A CONVERTER FUNCTION/WRITE CYCLE
A conversion/write cycle begins when the master issues the address byte containing the slave address of the
TSC2007, with the eighth bit equal to a 0 (R/W = 0), as shown in Table 1. Once the eighth bit has been
received, and the address matches the A1-A0 address input pin setting, the TSC2007 issues an acknowledge.
When the master receives the acknowledge bit from the TSC2007, the master writes the command byte to the
slave (see Table 2). After the command byte is received by the slave, the slave issues another acknowledge bit.
The master then ends the write cycle by issuing a repeated START or a STOP condition, as shown in Figure 31.
SCL
Address Byte
Command Byte
R/W
0
1
0
0
1
0
A1 A0
0
0
C3 C2 C1 C0 PD1 PD0
M
X
SDA
TSC2007
ACK
TSC2007
ACK
Acquisition
Conversion
START
STOP or
Repeated START
Figure 31. Complete I2C Serial Write Transmission
If the master sends additional command bytes after the initial byte, but before sending a STOP or repeated
START condition, the TSC2007 will not acknowledge those bytes.
The input multiplexer channel for the A/D converter is selected when bits C3 through C0 are clocked in. If the
selected channel is an X-,Y-, or Z-position measurement, the appropriate drivers will turn on once the acquisition
period begins.
When R/W = 0, the input sample acquisition period starts on the falling edge of SCL when the C0 bit of the
command byte has been latched, and ends when a STOP or repeated START condition has been issued. A/D
conversion starts immediately after the acquisition period. The multiplexer inputs to the A/D converter are
disabled once the conversion period starts. However, if an X-, Y-, or Z-position is being measured, the
respective touch screen drivers remain on during the conversion period. A complete write cycle is shown in
Figure 31.
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READ A CONVERSION/READ CYCLE
For best performance, the I2C bus should remain in an idle state while an A/D conversion is taking place. This
idling prevents digital clock noise from affecting the bit decisions being made by the TSC2007. The master
should wait for at least 10µs before attempting to read data from the TSC2007 to realize this best performance.
However, the master does not need to wait for a completed conversion before beginning a read from the slave,
if full 12-bit performance is not necessary.
Data access begins with the master issuing a START condition followed by the address byte (see Table 1) with
R/W = 1.
When the eighth bit has been received and the address matches, the slave issues an acknowledge. The first
byte of serial data will follow (D11-D4, MSB first).
After the first byte has been sent by the slave, it releases the SDA line for the master to issue an acknowledge.
The slave responds with the second byte of serial data upon receiving the acknowledge from the master (D3-D0,
followed by four 0 bits). The second byte is followed by a NOT acknowledge bit (ACK = 1) from the master to
indicate that the last data byte has been received. If the master somehow acknowledges the second data byte,
invalid data will be returned (FFh). This applies to both 12-and 8-bit modes. See Figure 32 for a complete I2C
read transmission.
SCL
Address Byte
Data Byte 2
Data Byte 1
R/W
1
D11 D10 D9 D8 D7 D6 D5 D4
0
D3 D2 D1 D0
0
0
0
0
1
1
0
0
1
0
A1 A0
0
SDA
START
TSC2007
ACK
MASTER
ACK
MASTER STOP or
NACK
Repeated
START
Figure 32. Complete I2C Serial Read Transmission
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THROUGHPUT RATE AND I2C BUS TRAFFIC
Although the internal A/D converter has a sample rate of up to 200kSPS, the throughput presented at the bus is
much lower. The rate is reduced because preprocessing manages the redundant work of filtering out noise. The
throughput is further limited by the I2C bus bandwidth. The effective throughput is approximately 20kSPS at 8-bit
resolution, or 10kSPS at 12-bit resolution. This preprocessing saves a large portion of the I2C bandwidth for the
system to use on other devices.
Each sample and conversion takes 19 CCLK cycles (12-bit), or 16 CCLK cycles (8-bit). For a typical internal
4MHz OSC clock, the frequency actually ranges from 3.66MHz to 3.82MHz. For VDD = 1.2V, the frequency
drops down to 3.19MHz, which gives a 3.19MHz/16 = 199kSPS raw A/D converter sample rate.
To send the conversion result across the I2C bus takes 49 bus clocks (SCL clock). Each write cycle takes 20 I2C
cycles (START, STOP, address byte, 2 ACKs, and command byte). Each read cycle takes 29 I2C cycles
(START, STOP, address byte, 3 ACKs, and data bytes 1 and 2). Seven sample-and-conversions take 19 x 7
internal clocks (12-bit), or 16 x 7 (8-bit) to convert. The MAV filter loop takes 19 internal clocks. For VDD = 1.2V,
the complete processed data cycle time calculations are shown in Table 5. Because the first acquisition cycle is
overlapped with the I/O cycle, four CCLKs should be deducted from the total CCLK cycles. For 12-bit mode, it
requires (19 × 7 + 19) – 4 = 148 CCLKs plus I/O. For 8-bit mode, it requires (16 × 7 + 19) – 4 = 127 CCLKs plus
I/O.
Table 5. Measurement Cycle Time Calculations
STANDARD MODE: 100kHz (Period = 10µs)
8-Bit
40 × 10µs + 127 × 313ns = 439.8µs (2.27kSPS through the I2C bus)
49 × 10µs + 148 × 625ns = 582.5µs (1.72kSPS through the I2C bus)
12-Bit
FAST MODE: 400kHz (Period = 2.5µs)
8-Bit
40 × 2.5µs + 127 × 313ns = 139.8µs (7.15kSPS through the I2C bus)
49 × 2.5µs + 148 × 625ns = 215µs (4.65kSPS through the I2C bus)
12-Bit
HIGH-SPEED MODE: 1.7MHz (Period = 588ns)
8-Bit
40 × 588ns + 127 × 313ns = 63.3µs (15.79kSPS through the I2C bus)
49 × 588ns + 148 × 625ns = 121.3µs (8.24kSPS through the I2C bus)
12-Bit
HIGH-SPEED MODE: 3.4MHz (Period = 294ns)
8-Bit
40 × 294ns + 127 × 313ns = 51.6µs (19.39kSPS through the I2C bus)
49 × 294ns + 148 × 625ns = 106.9µs (9.35kSPS through the I2C bus)
12-Bit
As an example, use VDD = 1.2V and 12-bit mode with the Fast-mode I2C clock (fSCL = 400kHz). The equivalent
TSC throughput is at least seven times faster than the effective throughput across the bus (4.65k x 7 =
32.55kSPS). The supply current to the TSC for this rate and configuration is 128µA. To achieve an equivalent
sample throughput of 8.2kSPS using the device without preprocessing, the TSC2007 merely consumes
(8.2/32.55) × 128µA = 32.24µA.
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Table 6. Effective and Equivalent Throughput Rates
TSC
CONVERSION
CYCLE TIME
(µs)
EFFECTIVE
THROUGHPUT THROUGHPUT
EQUIVALENT
SUPPLY
VOLTAGE
I2C BUS SPEED
(fSCL
# OF
SCL
# OF
CCLK
fCCLK
(kHz)
PERIODS
(ns)
)
RESOLUTION
8-bit
(kSPS)
2.31
(kSPS)
16.14
12.31
52.40
34.79
122.53
65.09
154.31
75.16
433.6
568.7
133.6
201.2
57.1
40
49
40
49
40
49
40
49
127
148
127
148
127
148
127
148
3780
1880
3780
1880
3780
1880
3780
1880
264.6
531.9
264.6
531.9
264.6
531.9
264.6
531.9
100kHz
Standard
12-bit
8-bit
1.76
7.49
400kHz
Fast
12-bit
8-bit
4.97
2.7V
1.8V
1.2V
17.50
9.30
1.7MHz
High-Speed
12-bit
8-bit
107.5
45.4
22.04
10.74
3.4MHz
High-Speed
12-bit
93.1
8-bit
12-bit
8-bit
434.7
570.9
134.7
203.4
58.2
2.30
1.75
16.10
12.26
51.97
34.42
120.22
63.81
150.65
73.46
40
49
40
49
40
49
40
49
127
148
127
148
127
148
127
148
3660
1830
3660
1830
3660
1830
3660
1830
273.2
546.4
273.2
546.4
273.2
546.4
273.2
546.4
100kHz
Standard
7.42
400kHz
Fast
12-bit
8-bit
4.92
17.17
9.12
1.7MHz
High-Speed
12-bit
8-bit
109.7
46.5
21.52
10.49
3.4MHz
High-Speed
12-bit
95.3
8-bit
12-bit
8-bit
439.8
582.5
139.8
215.0
63.3
2.27
1.72
7.15
4.65
15.79
8.24
19.39
9.35
15.92
12.02
50.07
32.56
110.51
57.70
135.72
65.47
40
49
40
49
40
49
40
49
127
148
127
148
127
148
127
148
3190
1600
3190
1600
3190
1600
3190
1600
313.5
625.0
313.5
625.0
313.5
625.0
313.5
625.0
100kHz
Standard
400kHz
Fast
12-bit
8-bit
1.7MHz
High-Speed
12-bit
8-bit
121.3
51.6
3.4MHz
High-Speed
12-bit
106.9
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Figure 34. Data Acquisition Cycle
(Filter Disabled)
Figure 33. Data Acquisition Cycle (Filter Enabled)
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LAYOUT
The following layout suggestions should obtain optimum performance from the TSC2007. However, many
portable applications have conflicting requirements for power, cost, size, and weight. In general, most portable
devices have fairly clean power and grounds because most of the internal components are very low power. This
situation would mean less bypassing for the converter power and less concern regarding grounding. Still, each
situation is unique and the following suggestions should be reviewed carefully.
For optimum performance, care should be taken with the physical layout of the TSC2007 circuitry. The basic
SAR architecture is sensitive to glitches or sudden changes on the power supply, reference, ground
connections, and digital inputs that occur just prior to latching the output of the analog comparator. Therefore,
during any single conversion for an n-bit SAR converter, there are n windows in which large external transient
voltages can easily affect the conversion result. Such glitches might originate from switching power supplies,
nearby digital logic, and high power devices. The degree of error in the digital output depends on the reference
voltage, layout, and the exact timing of the external event. The error can change if the external event changes in
time with respect to the SCL input.
With this in mind, power to the TSC2007 should be clean and well bypassed. A 0.1µF ceramic bypass capacitor
should be placed as close to the device as possible. In addition, a 1µF to 10µF capacitor may also be needed if
the impedance of the connection between VDD/REF and the power supply is high.
A bypass capacitor is generally not needed on the VDD/REF pin because the internal reference is buffered by
an internal op amp. If an external reference voltage originates from an op amp, make sure that it can drive any
bypass capacitor that is used without oscillation.
The TSC2007 architecture offers no inherent rejection of noise or voltage variation in regards to using an
external reference input, which is of particular concern when the reference input is tied to the power supply. Any
noise and ripple from the supply will appear directly in the digital results. While high-frequency noise can be
filtered out, voltage variation due to line frequency (50Hz or 60Hz) can be difficult to remove. Some package
options have pins labeled as VOID. Avoid any active trace going under those pins marked as VOID unless they
are shielded by a ground or power plane.
The GND pin should be connected to a clean ground point. In many cases, this point will be the analog ground.
Avoid connections that are too near the grounding point of a microcontroller or digital signal processor. If
needed, run a ground trace directly from the converter to the power-supply entry or battery connection point. The
ideal layout includes an analog ground plane dedicated to the converter and associated analog circuitry.
In the specific case of use with a resistive touch screen, care should be taken with the connection between the
converter and the touch screen. Since resistive touch screens have fairly low resistance, the interconnection
should be as short and robust as possible. Loose connections can be a source of error when the contact
resistance changes with flexing or vibrations.
As indicated previously, noise can be a major source of error in touch-screen applications (for example,
applications that require a back-lit LCD panel). This electromagnetic interfence (EMI) noise can be coupled
through the LCD panel to the touch screen and cause flickering of the converted ADC data. Several things can
be done to reduce this error, such as using a touch screen with a bottom-side metal layer connected to ground,
which will couple the majority of noise to ground. Additionally, filtering capacitors, from Y+, Y–, X+, and X– to
ground, can also help. Note, however, that the use of these capacitors increases screen settling time and
requires a longer time for panel voltages to stabilize. The resistor value varies depending on the touch screen
sensor used. The PENIRQ pullup resistor (RIRQ) may be adequate for most of sensors.
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PACKAGING INFORMATION
Orderable Device
TSC2007IPW
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
TSSOP
PW
16
16
16
16
12
12
90 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TSC2007IPWG4
TSC2007IPWR
TSC2007IPWRG4
TSC2007IYZGR
TSC2007IYZGT
TSSOP
TSSOP
TSSOP
DSBGA
DSBGA
PW
PW
90 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
PW
2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
YZG
YZG
3000 Green (RoHS &
no Sb/Br)
SNAGCU
Level-1-260C-UNLIM
250 Green (RoHS &
no Sb/Br)
SNAGCU
Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
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information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
17-May-2007
TAPE AND REEL INFORMATION
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
17-May-2007
Device
Package Pins
Site
Reel
Diameter Width
(mm)
Reel
A0 (mm)
7.0
B0 (mm)
5.6
K0 (mm)
1.6
P1
W
Pin1
(mm) (mm) Quadrant
(mm)
TSC2007IPWR
TSC2007IYZGR
TSC2007IYZGT
PW
YZG
YZG
16
MLA
330
12
8
4
4
12 PKGORN
T1TR-MS
P
12 UNITIVE
12 UNITIVE
177
177
8
8
1.65
1.65
0.71
8
PKGORN
T1TR-MS
P
1.65
1.65
0.71
8
PKGORN
T1TR-MS
P
TAPE AND REEL BOX INFORMATION
Device
Package
Pins
Site
Length (mm) Width (mm) Height (mm)
TSC2007IPWR
TSC2007IYZGR
TSC2007IYZGT
PW
YZG
YZG
16
12
12
MLA
342.9
195.2
195.2
336.6
193.7
193.7
20.6
34.9
34.9
UNITIVE
UNITIVE
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
17-May-2007
Pack Materials-Page 3
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
M
0,10
0,65
14
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°–8°
A
0,75
0,50
Seating Plane
0,10
0,15
0,05
1,20 MAX
PINS **
8
14
16
20
24
28
DIM
3,10
2,90
5,10
4,90
5,10
4,90
6,60
6,40
7,90
9,80
9,60
A MAX
A MIN
7,70
4040064/F 01/97
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D: 1.57 mm + 30 µm
E: 2.07 mm + 30 µm
IMPORTANT NOTICE
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DSP
Applications
Audio
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/audio
Automotive
Broadband
Digital Control
Military
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
interface.ti.com
logic.ti.com
Logic
Power Mgmt
Microcontrollers
RFID
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lpw
Telephony
Low Power
Wireless
Video & Imaging
Wireless
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2007, Texas Instruments Incorporated
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