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TSC2003 Scheda tecnica(PDF) 9 Page - Texas Instruments |
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TSC2003 Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 22 page TSC2003 9 SBAS162D www.ti.com THEORY OF OPERATION The TSC2003 is a classic Successive Approximation Register (SAR) Analog-to-Digital (A/D) converter. The archi- tecture is based on capacitive redistribution which inherently includes a sample-and-hold function. The converter is fabri- cated on a 0.6 µ CMOS process. The basic operation of the TSC2003 is shown in Figure 1. The device features an internal 2.5V reference and an internal 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 2V 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 con- verter is provided via a multiplexer. A unique configuration of low on-resistance switches allows an unselected A/D con- verter input channel to provide power, and an accompanying pin to provide ground for an external device. By maintaining FIGURE 1. Basic Operation of the TSC2003. a differential input to the converter, and a differential refer- ence architecture, it is possible to negate the switch’s on- resistance error (should this be a source of error for the particular measurement). ANALOG INPUT See Figure 2 for a block diagram of the input multiplexer on the TSC2003, the differential input of the A/D converter, and the converter's differential reference. When the converter enters the Hold mode, the voltage difference between the +IN and –IN inputs (see Figure 2) is captured on the internal capacitor array. The input current on the analog inputs depends on the conversion rate of the device. During the sample period, the source must charge the internal sampling capacitor (typically 25pF). After the capacitor has been fully charged, there is no further input current. The amount of charge transfer from the analog source to the converter is a function of conversion rate. 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 + 1 µF to 10 µF (Optional) +2.7V to +5V Touch Screen 0.1 µF 1 µF to 10 µF (Optional) 0.1 µF + Main Battery Secondary Battery 1.2k Ω 50k Ω 1.2k Ω Auxiliary Input Auxiliary Input Voltage Regulator |
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