TSC2014IYZGR datasheet(17/62 Pages) TI2

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Converter

-REF

+REF

+IN

-IN

AUX

GND

X+

X-

Pen Touch

IRQ

(1)

50kW

Y+

Y-

VDD/REF

PINTDAV

Preprocessing

Zone

Detect

Control

Logic

Level Shift

Data

Available

C3-C0

MAV

GND

TSC2014

www.ti.com

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

Product Folder Links: TSC2014

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Feature Description (continued)

7.3.4 Analog-to-Digital Converter

Figure 19 shows the analog inputs of the TSC2014. The analog inputs (X, Y, and Z touch panel coordinates, chip

temperature and auxiliary inputs) are provided via a multiplexer to the Successive Approximation Register (SAR)

Analog-to-Digital (A/D) converter. The A/D architecture is based on capacitive redistribution architecture, which

inherently includes a sample-and-hold function.

(1)

Untrimmed resistor; see the typical value in the Electrical Characteristics

Figure 19. Simplified Diagram of the Analog Input Section

A unique configuration of low on-resistance switches allows an unselected A/D converter input channel to

provide power and an accompanying pin to provide ground for driving the touch panel. By maintaining a

differential input to the converter and a differential reference input architecture, it is possible to negate errors

caused by the driver switch on-resistances.

The A/D converter is controlled by two A/D Converter Control registers. Several modes of operation are possible,

depending on the bits set in the control registers. Channel selection, scan operation, preprocessing, resolution,

and conversion rate may all be programmed through these registers. These modes are outlined in the sections

that follow for each type of analog input. The conversion results are stored in the appropriate result register.

TSC2014IYZGR Datasheet(PDF) 17 Page - Texas Instruments

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