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TSC2000IPW Datasheet(PDF) 8 Page - Texas Instruments |
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TSC2000IPW Datasheet(HTML) 8 Page - Texas Instruments |
8 / 35 page 8 www.ti.com TSC2000 SBAS257 FIGURE 1. Typical Circuit Configuration. OVERVIEW The TSC2000 is an analog interface circuit for human inter- face devices. A register-based architecture eases integration with microprocessor-based systems through a standard SPI bus. All peripheral functions are controlled through the reg- isters and onboard state machines. The TSC2000 consists of the following blocks (refer to the block diagram on the front page): • Touch Screen Interface • Battery Monitors • Auxiliary Inputs • Temperature Monitor • Current Output D/A Converter Communication to the TSC2000 is via a standard SPI serial interface. This interface requires that the Slave Select signal be driven LOW to communicate with the TSC2000. Data is then shifted into or out of the TSC2000 under control of the host microprocessor, which also provides the serial data clock. Control of the TSC2000 and its functions is accomplished by writing to different registers in the TSC2000. A simple com- mand protocol is used to address the 16-bit registers. Reg- isters control the operation of the A/D converter and D/A converter. The result of measurements made will be placed in the TSC2000’s memory map and may be read by the host at any time. Three signals are available from the TSC2000 to indicate that data is available for the host to read. The DAV output indicates that an A/D conversion has completed and that data is available. The PENIRQ output indicates that a touch has been detected on the touch screen. A typical application of the TSC2000 is shown in Figure 1. + Auxiliary Input Auxiliary Input Pen Interrupt Request Serial Data Out Data Available Serial Data In Slave Select Serial Clock 1 µF to 10 µF (Optional) +2.7V to +3.3V Touch Screen 0.1 µF +V DD X+ Y+ X– Y– GND V BAT1 V BAT2 V REF NC AUX1 AUX2 ARNG A OUT PENIRQ MISO DAV MOSI SS SCLK 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 TSC2000 + 1 µF to 10 µF (Optional) 0.1 µF Main Battery Secondary Battery LCD Contrast Voltage Regulator RRNG |
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