TSC2302
SLAS394 – JULY 2003
PROGRAMMABLE TOUCH SCREEN CONTROLLER
WITH STEREO AUDIO CODEC
FEATURES
•
•
SPI™ Serial Interface
Touch Screen Controller
– 4-Wire Touch Screen Interface
– Internal Detection of Screen Touch
– Touch Pressure Measurement
– Ratiometric Conversion
– Programmable 8-, 10- or 12-Bit Resolution
– Programmable Sampling Rates Up to
125 kHz
– Direct Battery Measurement (0 to 6 V)
– On-Chip Temperature Measurement
– Integrated Touch Screen Processor
Reduces Host CPU Interrupts and Overhead
– Internal Timing Control With Programmable
Delays and Averaging
Stereo Audio Codec
– 20-Bit Delta-Sigma ADC/DAC
– Dynamic Range: 98 dB
– Sampling Rate Up to 48 kHz
– I
2
S Serial Interface
– Stereo 16-Ω Headphone Driver
Full Power-Down Control
8-Bit Current Output DAC
On-Chip Crystal Oscillator
Programmable Bass/ Midrange/ Treble EQ
Effects Processing
Single 2.7-V to 3.6-V Supply
48-pin QFN Package
APPLICATIONS
•
•
•
•
•
Personal Digital Assistants
Cellular Phones
MP3 Players
Internet Appliances
Smartphones
DESCRIPTION
The TSC2302 is a highly integrated PDA analog
interface circuit. It contains a complete 12-bit A/D
resistive touch screen converter (ADC) including
drivers, touch pressure measurement capability, and
8-bit D/A converter (DAC) output for LCD contrast
control. The TSC2302 offers programmable resolution
of 8, 10, and 12 bits and sampling rates up to 125 kHz
to accommodate different screen sizes. The TSC2302
interfaces to the host controller through a standard SPI
serial interface.
The TSC2302 features a high-performance 20-bit,
48-ksps stereo audio codec with highly integrated
analog functionality. The audio portion of the TSC2302
contains microphone input with built-in pre-amp and
microphone bias circuit, an auxiliary stereo analog
input, a mono line-level output, and a stereo
headphone amplifier output. The digital audio data is
transferred through a standard I
2
S interface. A fully
programmable PLL for generating audio clocks from a
wide variety of system clocks is also included.
The TSC2302 also offers two battery measurement
inputs capable of battery voltages up to 6 V, while
operating at a supply voltage of only 2.7 V. It also has
an on-chip temperature sensor capable of reading
0.3°C resolution. The TSC2302 is available in a
48-lead QFN.
US Patent No. 6246394
•
•
•
•
•
•
•
SPI is a trademark of Motorola.
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 in-
clude testing of all parameters.
Copyright © 2003, Texas Instruments Incorporated
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TSC2302
SLAS394 – JULY 2003
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE
PACKAGE
DESIGNATOR
OPERATING
TEMPERATURE
RANGE
-40°C to +85°C
ORDERING
NUMBER
TSC2302IRGZ
TSC2302IRGZR
TRANSPORT MEDIA
QUANTITY
Trays, 308
Tape and reel, 2000
TSC2302I
QFN-48
RGZ
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted (1)
TSC2302
Supply voltage:
Ground voltage differences:
Digital input voltage
Analog input voltage
Ambient temperature under bias, T
A
Storage temperature, T
stg
Junction temperature, T
J
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
(1)
AVDD, HPVDD, DVDD
AGND, DGND
4V
±0.1
V
-0.3 V to (DV
DD
+ 0.3 V)
-0.3 V to (AV
DD
+ 0.3 V)
-40°C to 125°C
-55°C to 150°C
150°C
260°C
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 under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
3
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TSC2302
SLAS394 – JULY 2003
www.ti.com
ELECTRICAL CHARACTERISTICS
At 25°C, HPV
DD
= AV
DD
= DV
DD
= +3.3 V, V
REF
= External 2.5 V, unless otherwise noted.
PARAMETER
AUXILARY ANALOG INPUTS
Input voltage range
Input capacitance
Input leakage current
BATTERY MONITOR INPUT
Input voltage range
Input capacitance
Input leakage current
TEMPERATURE MEASUREMENT
Temperature range
Temperature resolution
Accuracy
TOUCH SCREEN A/D CONVERTER
Resolution
No missing codes
Integral linearity
Offset error
Gain error
Noise
AUDIO CODEC
Sampling frequency
AUDIO I/O
Audio in
Audio out
AUDIO ADC
Signal-to-noise ratio, A-weighted
Total harmonic distortion
Full-scale input voltage
Transition band
Stop band
Stop band rejection
AUDIO DAC
Full-scale output voltage
Frequency response
Transition band
Stop band
Stop band rejection
HEADPHONE DRIVER
Output power per channel
DAC playback through headphone
driver
R = 32
Ω
R = 16
Ω
4
13
27
mW
mW
20
0.45Fs
0.55Fs
65
DAC performance measured at HP
Outputs using Fs = 48 kHz
0.18*
AVDD
0.45Fs
0.55Fs
3.5Fs
Vrms
Hz
Hz
Hz
dB
0.45Fs
0.55Fs
70dB
Line, Mic inputs
HP outputs
ADC performance measured using Fs
= 48 kHz
No input
1 kHz, -0.5 dB input
80
88
-70
0.18*
AVDD
0.55Fs
127Fs
-60
dB
dB
Vrms
Hz
Hz
0.15*
AVDD
0.15*
AVDD
0.65* AVDD
0.65* AVDD
V
V
48
kHz
<300
Programmable: 8-, 10-,12-Bits
12-bit resolution
10
±6
±6
±6
12
Bits
Bits
LSB
LSB
LSB
µV
RMS
-40
0.3
±2
+85
°C
°C
°C
0
25
±1
6.0
V
ρF
µA
0
25
1
+VREFIN
V
ρF
µA
CONDITIONS
TSC2302
MIN
TYP
MAX
UNITS
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TSC2302
SLAS394 – JULY 2003
ELECTRICAL CHARACTERISTICS (continued)
At 25°C, HPV
DD
= AV
DD
= DV
DD
= +3.3 V, V
REF
= External 2.5 V, unless otherwise noted.
PARAMETER
CONDITIONS
R = 16
Ω
V
DD
= 3.6V
Signal-to-noise ratio, A-weighted
Total harmonic distortion
D/A CONVERTER
Output current range
Resolution
VOLTAGE REFERENCE
Voltage range
Reference drift
External reference input
Current drain
DIGITAL INPUT / OUTPUT
Internal clock frequency
Logic family
Logic level: V
IH
V
IL
V
OH
V
OL
POWER SUPPLY REQUIREMENTS
Power supply voltage
DV
DD
, AV
DD
, HPV
DD
Quiescent current (1)
Touch screen only
Touch screen only
Stereo playback only
Voice record only
Power down
(1)
1-kHz SAR sample rate, external V
ref
20-kHz SAR sample rate, internal V
ref
44.1-kHz Playback, V
DD
= 2.7V
Mono 8-kHz record, V
DD
= 2.7V
Audio fully powered down
2.7
14
1.7
10
5.8
.05
3.6
V
µA
mA
mA
mA
µA
I
IH
= 5µA
I
IL
= 5µA
I
OH
= 2 TTL loads
I
OL
= 2 TTL loads
0.7V
DD
-0.3
0.8*
DVDD
0.2* DVDD
0.3V
DD
8.8
CMOS
V
V
V
V
MHz
1
20
Internal 2.5 V
2.34
2.49
50
V
DD
2.64
V
ppm/°
C
V
µA
Measured with ARNG floating
0.75
1.10
8
mA
Bits
R = 32
Ω
1-kHz, 0-dB input
R = 16
Ω
1-kHz, -3-dB input
85
TSC2302
MIN
TYP
31
96
-83
-77
-70
MAX
UNITS
mW
dB
dB
dB
For more details on power consumption, see the Audio Codec section of the description overview.
5
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