Burr Brown Products
from Texas Instruments
TSC2005
SBAS379A – DECEMBER 2006 – REVISED MAY 2007
1.6V to 3.6V, 12-Bit, Nanopower, 4-Wire
TOUCH SCREEN CONTROLLER with SPI™ Interface
FEATURES
•
•
•
•
•
•
•
4-Wire Touch Screen Interface
Ratiometric Conversion
Single 1.6V to 3.6V Supply
Preprocessing to Reduce Bus Activity
High-Speed SPI-Compatible Interface
Internal Detection of Screen Touch
Register-Based Programmable:
– 10-Bit or 12-Bit Resolution
– Sampling Rates
– System Timing
On-Chip Temperature Measurement
Touch Pressure Measurement
Auto Power-Down Control
Low Power:
– 800µW at 1.8V, 50SSPS
– 600µW at 1.6V, 50SSPS
– 75µW at 1.6V, 8.2kSPS Eq. Rate
Enhanced ESD Protection:
–
±6kV
HBM
–
±1kV
CDM
–
±25kV
Air Gap Discharge
–
±12kV
Contact Discharge
2.5 x 3 WCSP-18 Package
APPLICATIONS
•
•
•
•
•
•
Personal Digital Assistants
Cellular Phones
Portable Instruments
Point-of-Sale Terminals
MP3 Players, Pagers
Multiscreen Touch Control
DESCRIPTION
The TSC2005 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 1.6V, 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.
In addition to these standard features, the TSC2005
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 TSC2005 supports an SPI-compatible serial bus
up to 25MHz. It offers programmable resolution of 10
or 12 bits to accommodate different screen sizes and
performance needs.
The TSC2005 is available in a miniature 18-lead,
5 x 6 array, 2.608 x 3.108 mm wafer chip-scale
package (WCSP). The device is characterized for the
–40°C to +85°C industrial temperature range.
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U.S. Patent NO. 6246394; other patents pending.
PENIRQ
VREF
X+
X-
Y+
Y-
Touch
Screen
Drivers
Interface
TEMP
AUX
Internal
Clock
DAV
PINTDAV
Pre-Processing
CS
SPI
Serial
Interface
and
Control
SCLK
SDI
RESET
SDO
Mux
SAR
ADC
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.
SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated
TSC2005
www.ti.com
SBAS379A – DECEMBER 2006 – REVISED MAY 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
(BITS)
PACKAGE
TYPE
18-Pin,
5 x 6 Matrix,
2.5 x 3
WCSP
PACKAGE
DESIGNATOR
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER
TSC2005IYZLT
YZL
–40°C to +85°C
TSC2005I
TSC2005IYZLR
TRANSPORT
MEDIA,
QUANTITY
Small Tape
and Reel, 250
Tape and
Reel, 3000
PRODUCT
TSC2005
±1.5
– 0.2/+4.4
11
(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)
TSC2005
Analog input X+, Y+, AUX to SNSGND
Analog input X–, Y– to SNSGND
Voltage range
SNSVDD to SNSGND
SNSVDD to AGND
I/OVDD to DGND
SNSVDD to I/OVDD
Digital input voltage to DGND
Digital output voltage to DGND
Power dissipation
Thermal impedance,
θ
JA
Operating free-air temperature range, T
A
Storage temperature range, T
STG
Junction temperature, T
J
Max
Lead temperature
IEC contact discharge
(2)
IEC air
(1)
(2)
discharge
(2)
Vapor phase (60 sec)
Infrared (15 sec)
X+, X–, Y+, Y–
X+, X–, Y+, Y–
WCSP package
WCSP package
Low-K
High-K
–0.4 to SNSVDD + 0.1
–0.4 to SNSVDD + 0.1
–0.3 to 5
–0.3 to 5
–0.3 to 5
–2.40 to +0.3
–0.3 to I/OVDD + 0.3
–0.3 to I/OVDD + 0.3
(T
J
Max - T
A
)/θ
JA
113
62
–40 to +85
–65 to +150
+150
+215
+220
±12
±25
°C/W
°C
°C
°C
°C
°C
kV
kV
UNIT
V
V
V
V
V
V
V
V
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.
Test method based on IEC standard 61000-4-2. Contact Texas Instruments for test details.
2
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TSC2005
www.ti.com
SBAS379A – DECEMBER 2006 – REVISED MAY 2007
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +85°C, SNSVDD = V
REF
= +1.6V to +3.6V, I/OVDD = +1.2V to +3.6V, unless otherwise noted.
TSC2005
PARAMETER
AUXILIARY ANALOG INPUT
Input voltage range
Input capacitance
Input leakage current
A/D CONVERTER
Resolution
No missing codes
Integral linearity
Offset error
SNSVDD = 1.6V, V
REF
= 1.6V
SNSVDD = 3.0V, V
REF
= 2.5V
SNSVDD = 1.6V, V
REF
= 1.6V
SNSVDD = 3.0V, V
REF
= 2.5V
1.6
Non-cont. AUX mode, SNSVDD = 3V, V
REF
= 2.5V,
T
A
= +25°C, f
ADC
= 2MHz, f
SCLK
= 10MHz
A/D converter not converting
5.6
1
Programmable: 10 or 12 bits
12-bit resolution
11
±1.5
–0.8 to +0.3
+3.2 to +8.9
–0.2 to 0
+3.8 to +4.4
12
Bits
Bits
LSB
(1)
LSB
LSB
LSB
LSB
–1
0
12
+1
VREF
V
pF
µA
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Gain error
REFERENCE INPUT
V
REF
range
VREF input current drain
Input impedance
TOUCH SENSORS
PENIRQ Pull-Up Resistor, R
IRQ
Switch
On-Resistance
Y+, X+
Y–, X–
SNSVDD
V
µA
GΩ
T
A
= +25°C, SNSVDD = 3V, V
REF
= 2.5V
51
6
5
kΩ
Ω
Ω
50
mA
°C
°C/LSB
°C/LSB
°C/LSB
°C/LSB
MHz
MHz
%/°C
%/°C
Switch drivers drive current
(2)
TEMPERATURE MEASUREMENT
Temperature range
Resolution
100ms duration
–40
Differential
method
(3)
,
SNSVDD = 3V V
REF
= 2.5V
1.6
0.3
±2
±3
3.6
3.8
0.0056
0.012
TEMP1
(4)
, SNSVDD = 3V V
REF
= 2.5V
Differential method
(3)
, SNSVDD = 3V V
REF
= 2.5V
TEMP1
(4)
,
SNSVDD = 3V V
REF
= 2.5V
+85
Accuracy
INTERNAL OSCILLATOR
Clock frequency, f
OSC
Frequency drift
DIGITAL INPUT/OUTPUT
Logic family
V
IH
V
IL
Logic level
I
IL
C
IN
V
OH
V
OL
I
LEAK
C
OUT
Data format
SNSVDD = 1.6V
SNSVDD = 3.0V
SNSVDD = 1.6V
SNSVDD = 3.0V
CMOS
1.2V
≤
I/OVDD < 1.6V
1.6V
≤
I/OVDD
≤
3.6V
1.2V
≤
I/OVDD < 1.6V
1.6V
≤
I/OVDD
≤
3.6V
SCLK pin or CS pin
0.7 × I/OVDD
0.7 × I/OVDD
–0.3
–0.3
–1
I/OVDD + 0.3
I/OVDD + 0.3
0.2 × I/OVDD
0.3 × I/OVDD
1
10
I
OH
= 2 TTL loads
I
OL
= 2 TTL loads
Floating output
Floating output
Straight Binary
I/OVDD – 0.2
0
–1
I/OVDD
0.2
1
10
V
V
V
V
µA
pF
V
V
µA
pF
(1)
(2)
(3)
(4)
LSB means Least Significant Bit. With V
REF
= +2.5V, one LSB is 610µV.
Assured by design, but not tested. Exceeding 50mA source current may result in device degradation.
Difference between TEMP1 and TEMP2 measurement; no calibration necessary.
Temperature drift is –2.1mV/°C.
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TSC2005
www.ti.com
SBAS379A – DECEMBER 2006 – REVISED MAY 2007
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to +85°C, SNSVDD = V
REF
= +1.6V to +3.6V, I/OVDD = +1.2V to +3.6V, unless otherwise noted.
TSC2005
PARAMETER
POWER-SUPPLY REQUIREMENTS
Power-supply voltage
SNSVDD
(5)
I/OVDD
(6)
With filter, M = 15, W = 7, PSM = 1, C[3:0] = (0,0,0,0),
RM = 1, CL[1:0] = (0,1), BTD[2:0] = (1,0,1), 50SSPS,
MAVEX = MAVEY = MAVEZ = 1, SNSVDD = I/OVDD =
REF = 1.6V, f
ADC
= 2MHz, f
SCLK
= 10MHz, sensor drivers
supply included
Bypass filter, M = W = 1, PSM = 1, C[3:0] = (0,0,0,0),
RM = 1, CL[1:0] = (0,1), MAVEX = MAVEY = MAVEZ =
1, SNSVDD = I/OVDD = REF = 1.6V, f
ADC
= 2MHz, f
SCLK
= 10MHz, sensor drivers supply included
Bypass filter, M = W = 1, C[3:0] = (0,1,0,1), RM = 1,
CL[1:0] = (0,1), non-cont AUX mode, SNSVDD =
I/OVDD = REF = 1.6V, f
ADC
= 2MHz, f
SCLK
= 10MHz
Quiescent supply current
(7)
Bypass filter, M = W = 1, C[3:0] = (0,1,0,1), RM = 1,
CL[1:0] = (0,1), non-cont AUX mode, SNSVDD = 3V,
I/OVDD = REF = 1.6V, f
ADC
= 2MHz, f
SCLK
= 10MHz
With filter, M = 7, W = 3, C[3:0] = (0,1,0,1), RM = 1,
CL[1:0] = (0,1), MAVEAUX = 1, non-cont AUX mode,
SNSVDD = I/OVDD = REF = 1.6V, f
ADC
= 2MHz, f
SCLK
=
3.5MHz, full speed, (~13kSPS effective rate, 91kSPS
equivalent rate)
With filter, M = 7, W = 3, C[3:0] = (0,1,0,1), RM = 1,
CL[1:0] = (0,1), MAVEAUX = 1, non-cont AUX mode,
SNSVDD = I/OVDD = REF = 1.6V, f
ADC
= 2MHz, f
SCLK
=
3.5MHz, reduced speed, (~1.17kSPS effective rate,
8.2kSPS equivalent rate)
Power down supply current
CS high, SCLK = 0
Specified performance
1.6
1.2
3.6
SNSVDD
V
V
TEST CONDITIONS
MIN
TYP
MAX
UNIT
383
µA
361
µA
481
µA
943
µA
522
µA
47
µA
0
0.8
µA
(5)
(6)
(7)
TSC2005 functions down to 1.4V, typically.
I/OVDD must be
≤
SNSVDD.
Supply current from SNSVDD.
4
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TSC2005
www.ti.com
SBAS379A – DECEMBER 2006 – REVISED MAY 2007
PIN CONFIGURATION
YZL PACKAGE
WCSP-18
(TOP VIEW, SOLDER BUMPS ON BOTTOM SIDE)
AGND
5
VREF
SNSVDD
X+
Y+
SUBGND
AUX
4
I/OVDD
3
DGND
2
NC
NC
NC
X-
Rows
NC
NC
NC
Y-
NC
NC
NC
NC
SNSGND
RESET PINTDAV
1
A
B
SDI
SCLK
SDO
CS
C
D
Columns
E
F
(FRONT
VIEW)
PIN ASSIGNMENTS
PIN
NO.
A1
A2
A3
A4
A5
B1
B2, B3,
B4, C2,
D2, E2,
E3, E4
B5
C1
C3, C4,
D3, D4
C5
D1
D5
E1
E5
F1
F2
F3
F4
F5
NAME
RESET
DGND
I/OVDD
AUX
AGND
PINTDAV
O
D
I
A
I/O
I
A/D
D
DESCRIPTION
System reset. All register values reset to default value.
Digital ground
Digital I/O interface voltage
Auxiliary channel input
Analog ground
Interrupt output. Data available or PENIRQ depends on setting. Pin polarity with active low.
NC
No connection.
VREF
SDI
NC
SNSVDD
SCLK
X+
SDO
Y+
CS
SNSGND
Y–
X–
SUBGND
I
I
A
D
External reference input
Serial data input. This input is the MOSI signal for the SPI interface protocol.
No connection. Sensitive area; avoid trace beneath. Some bumps on the WCSP may be depopulated.
Power supply for sensor drivers and other analog blocks.
I
I
O
I
I
D
A
D
A
D
Serial clock input
X+ channel input
Serial data output. This output is the MISO for the SPI interface protocol.
Y+ channel input
Chip select. This input is the slave select (SS) signal for the SPI interface protocol.
Sensor driver return
I
I
A
A
Y– channel input
X– channel input
Substrate ground (for ESD current)
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