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TSC2003-Q1 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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TSC2003-Q1 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 28 page DEVICE INFORMATION 1 2 3 4 5 6 7 8 +V DD X+ Y+ X– Y– GND V BAT1 V BAT2 IN1 IN2 A0 A1 SCL SDA PENIRQ V REF 16 15 14 13 12 11 10 9 TSC2003 Serial Clock Serial Data Pen Interrupt + 1µF to 10µF (Optional) +2.7V to +5V Touch Screen 0.1 F µ 1 F µ to 10µF (Optional) 0.1 F µ + Main Battery Secondary Battery 1.2kΩ 50kΩ 1.2kΩ Auxiliary Input Auxiliary Input Voltage Regulator TSC2003-Q1 www.ti.com ........................................................................................................................................................................................... SBAS454 – DECEMBER 2008 The TSC2003 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 0.6 µ CMOS process. The basic operation of the TSC2003 is shown in Figure 3. The device features an internal 2.5-V reference and an internal clock. Operation is maintained from a single supply of 2.7 V to 5.25 V. The internal reference can be overdriven with an external, low-impedance source between 2 V and VDD. The value of the reference voltage directly sets the input range of the converter. The analog input (X, Y, and Z parallel coordinates, auxiliary inputs, battery voltage, and chip temperature) to the converter is provided via a multiplexer. A unique configuration of low on-resistance switches allows an unselected ADC input channel to provide power and an accompanying pin to provide ground for an external device. By maintaining Figure 3, a differential input to the converter, and a differential reference architecture, it is possible to negate the switch’s on-resistance error (should this be a source of error for the particular measurement). Figure 3. Basic Operation of the TSC2003 Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TSC2003-Q1 |
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