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TSC2046IGQCR 데이터시트(PDF) 8 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
부품명 TSC2046IGQCR
상세설명  Low Voltage I/O TOUCH SCREEN CONTROLLER
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제조업체  BURR-BROWN [Burr-Brown (TI)]
홈페이지  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

TSC2046IGQCR 데이터시트(HTML) 8 Page - Burr-Brown (TI)

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TSC2046
8
SBAS265C
www.ti.com
THEORY OF OPERATION
The TSC2046 is a classic successive approximation register
(SAR) analog-to-digital converter (ADC). The architecture is
based on capacitive redistribution, which inherently includes
a sample-and-hold function. The converter is fabricated on a
0.6µm CMOS process.
The basic operation of the TSC2046 is shown in Figure 1.
The device features an internal 2.5V reference and uses an
external clock. Operation is maintained from a single supply
of 2.7V to 5.25V. The internal reference can be overdriven
with an external, low-impedance source between 1V and
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted.
+VCC. The value of the reference voltage directly sets the
input range of the converter.
The analog input (X-, Y-, and Z-Position coordinates, auxiliary
input, battery voltage, and chip temperature) to the converter is
provided via a multiplexer. A unique configuration of low on-
resistance touch panel driver switches allows an unselected
ADC input channel to provide power and the accompanying pin
to provide ground for an external device, such as a touch
screen. By maintaining a differential input to the converter and
a differential reference architecture, it is possible to negate the
error from each touch panel driver switch’s on-resistance (if this
is a source of error for the particular measurement).
FIGURE 1. Basic Operation of the TSC2046.
TEMP1 DIODE VOLTAGE vs +V
CC
2.7
3.0
3.3
+V
CC (V)
720
718
716
714
712
710
+V
CC
+V
CC
X+
Y+
X–
Y–
V
BAT
AUX
B1
C1
D1
E1
G2
G3
G6
E7
G4
G5
A2
A3
A4
A5
A6
B7
C7
D7
DCLK
CS
DIN
BUSY
DOUT
PENIRQ
IOVDD
V
REF
Serial/Conversion Clock
Chip Select
Serial Data In
Converter Status
Serial Data Out
+
1
µF
to
10
µF
(Optional)
+2.7V to +5V
TSC2046
Auxiliary Input
To Battery
Voltage
Regulator
Touch
Screen
0.1
µF
Pen Interrupt
GND
GND
NOTE: BGA package and pin names shown.


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