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參數資料
| 型號： | TSC2302IRGZRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | GREEN, PLASTIC, VQFN-48 |
| 文件頁數： | 5/85頁 |
| 文件大?。?/td> | 1483K |
| 代理商： | TSC2302IRGZRG4 |
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Vdd (V)
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TSC2302
SLAS394 – JULY 2003
TYPICAL CHARACTERISTICS (continued)
At T
A = +25°C, +VDD = +3.3 V, VREF = +2.5 V, fSAMPLE = 125 kHz, unless otherwise noted.
SNR OF BYPASS PATH
THD OF MONO PATH
SNR OF MONO PATH
vs
SUPPLY VOLTAGE
Figure 37.
Figure 38.
Figure 39.
OVERVIEW
The TSC2302 is an analog interface circuit for human interface devices. A register-based architecture eases
integration with microprocessor-based systems through a standard SPI bus. All peripheral functions are
controlled through the registers and onboard state machines.
The TSC2302 consists of the following blocks (refer to the block diagram on p. 2):
Touch screen interface
Battery monitors
Auxiliary inputs
Temperature monitor
Current output digital-to-analog converter
Audio codec and signal processing
Communication to the TSC2302 is via a standard SPI serial interface. This interface requires that the slave select
signal be driven low to communicate with the TSC2302. Data is then shifted into or out of the TSC2302 under
control of the host microprocessor, which also provides the serial data clock.
Control of the TSC2302 and its functions is accomplished by writing to different registers in the TSC2302. A
simple command protocol is used to address the 16-bit registers. Registers control the operation of the touch
screen A/D converter, and audio codec.
The result of measurements made are placed in the TSC2302 memory map and can be read by the host at any
time. Three signals are available from the TSC2302 to indicate that data is available for the host to read. The
DAV output indicates that an analog-to-digital conversion has completed and that data is available. The PENIRQ
output indicates that a touch has been detected on the touch screen.
For a typical application of the TSC2302, see the TSC2301 data sheet (SLAS371).
DETAILED DESCRIPTION
OPERATION - TOUCH SCREEN
A resistive touch screen works by applying a voltage across a resistor network and measuring the change in
resistance at a given point on the matrix where a screen is touched by an input stylus, pen, or finger. The change
in the resistance ratio marks the location on the touch screen.
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