Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - Touchscreen controller 12 Bit 1x TSC input VQFN 16

FEATURES

D Same Pinout as ADS7846

D 2.2V to 5.25V Operation

D 1.5V to 5.25V Digital I/O

D Internal 2.5V Reference

D Direct Battery Measurement (0V to 6V)

D On-Chip Temperature Measurement

D Touch-Pressure Measurement

D QSPI and SPI 3-Wire Interface

D Auto Power-Down

D Exceeds IEC 61000-4-2 ESD Requirements

− +15kV Contact Discharge

− No External Components Needed

D Available In TSSOP-16, QFN-16, and

VFBGA-48 Packages

APPLICATIONS

D Personal Digital Assistants

D Portable Instruments

D Point-of-Sale Terminals

D Pagers

D Touch Screen Monitors

D Cellular Phones

US Patent No. 6246394

DESCRIPTION

The TSC2046E is the next-generation version of the

ADS7846 4-wire touch screen controller, supporting a

low-voltage I/O interface from 1.5V to 5.25V. The

TSC2046E is 100% pin-compatible with the existing

ADS7846, and drops into the same socket. This design

allows for an easy upgrade of current applications to the

new version. The TSC2046E also has an on-chip 2.5V

reference that can be used for the auxiliary input, battery

monitor, and temperature measurement modes. The

reference can also be powered down when not used to

conserve power. The internal reference operates down to

a supply voltage of 2.7V, while monitoring the battery

voltage from 0V to 6V.

The low-power consumption of < 0.75mW typ at 2.7V

(reference off), high-speed (up to 125kHz sample rate),

and on-chip drivers make the TSC2046E an ideal choice

for battery-operated systems such as personal digital

assistants (PDAs) with resistive touch screens, pagers,

cellular phones, and other portable equipment. The

TSC2046E is available in TSSOP-16, QFN-16, and

VFBGA-48 packages and is specified over the –40°C to

+85°C temperature range.

CDAC

Internal 2.5V Reference

SAR

TSC2046E

Comparator

6−Channel

MUX

Serial

Data

In/Out

Temperature

Sensor

Pen Detect

Battery

Monitor

DOUT

BUSY

DCLK

DIN

BAT

AUX

REF

IOVDD

X+

−

Y+

Y−

PENIRQ

         

          

 !     !   

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SPI and QSPI are trademarks of Motorola Inc.

Microwire is a trademark of National Semiconductor Corporation.

All other trademarks are the property of their respective owners.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

TSC2046E

SBAS417B − JUNE 2007 − REVISED JANUARY 2008

Low Voltage I/O

TOUCH SCREEN CONTROLLER

Summary of content (32 pages)

PAGE 1
TSC2046E SBAS417B − JUNE 2007 − REVISED JANUARY 2008 Low Voltage I/O TOUCH SCREEN CONTROLLER FEATURES D D D D D D D D D D D DESCRIPTION Same Pinout as ADS7846 2.2V to 5.25V Operation 1.5V to 5.25V Digital I/O Internal 2.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY +VCC and IOVDD to GND . . . . . . . . . . . . . . . . . . . . . −0.3V to +6V Analog Inputs to GND . . . . . . . . . . . . . . . . . −0.3V to +VCC + 0.3V Digital Inputs to GND . . . . . . . . . . . . . . . . . −0.3V to IOVDD + 0.3V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250mW Maximum Junction Temperature . . . . . . . . . . . . . . . .
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V At TA = −40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, digital inputs = GND or IOVDD, and +VCC must be ≥ IOVDD, unless otherwise noted. PARAMETER ANALOG INPUT Full-Scale Input Span Absolute Input Range CONDITION MIN Positive Input−Negative Input Positive Input Negative Input 0 −0.2 −0.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued) At TA = −40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, digital inputs = GND or IOVDD, and +VCC must be ≥ IOVDD, unless otherwise noted.
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" #$%&' www.ti.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 TYPICAL CHARACTERISTICS At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. CHANGE IN OFFSET vs TEMPERATURE 0.10 0.4 Delta from +25°C (LSB) 0.6 0.05 0 −0.05 −0.10 −0.15 −40 −20 0 20 40 60 80 0.2 0 −0.2 −0.4 −0.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. INTERNAL VREF vs TEMPERATURE MAXIMUM SAMPLING RATE vs RIN 2.5080 2.5075 INL: RIN = 500Ω INL: RIN = 2kΩ DNL: RIN = 500Ω DNL: RIN = 2kΩ 1.8 1.6 1.4 2.5070 Internal VREF (V) Max Absolute Delta Error from RIN = 0 (LSB) 2.0 1.2 1.0 0.8 0.6 2.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. TEMP1 DIODE VOLTAGE vs +VCC TEMP1 Diode Voltage (mV) 720 718 716 714 712 710 2.7 3.0 3.3 +VCC (V) THEORY OF OPERATION The TSC2046E is a classic successive approximation register (SAR) analog-to-digital converter (ADC).
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 ANALOG INPUT When the converter enters the hold mode, the voltage difference between the +IN and –IN inputs (shown in Figure 2) is captured on the internal capacitor array. The input current into the analog inputs depends on the conversion rate of the device. During the sample period, the source must charge the internal sampling capacitor (typically 25pF). After the capacitor is fully charged, there is no further input current.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 INTERNAL REFERENCE The TSC2046E has an internal 2.5V voltage reference that can be turned on or off with the control bit, PD1 (see Table 5 and Figure 3). Typically, the internal reference voltage is only used in the single-ended mode for battery monitoring, temperature measurement, and for using the auxiliary input. Optimal touch screen performance is achieved when using the differential mode.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 +VCC Y+ X+ +IN +REF Converter −IN −REF Y− GND Figure 5. Simplified Diagram of Differential Reference (SER/DFR low, Y switches enabled, X+ is analog input) As a final note about the differential reference mode, it must be used with +VCC as the source of the +REF voltage and cannot be used with VREF.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 The second mode of operation does not require a test temperature calibration, but uses a two-measurement method to eliminate the need for absolute temperature calibration and for achieving 2°C accuracy. This mode requires a second conversion with an address of A2 = 1, A1 = 1, and A0 = 1, with a 91 times larger current.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 PRESSURE MEASUREMENT DIGITAL INTERFACE Measuring touch pressure can also be done with the TSC2046E. To determine pen or finger touch, the pressure of the touch needs to be determined. Generally, it is not necessary to have very high performance for this test; therefore, the 8-bit resolution mode is recommended (however, calculations shown here are in the 12-bit resolution mode).
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 Control Byte mode, the converter reference voltage is always the difference between the VREF and GND pins (see Table 1 and Table 2, and Figure 2 through Figure 5, for further information). The control byte (on DIN), as shown in Table 3, provides the start conversion, addressing, ADC resolution, configuration, and power-down of the TSC2046E.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 If X-Position, Y-Position, and Pressure-Touch are measured in the single-ended mode, an external reference voltage is needed. The TSC2046E must also be powered from the external reference. Caution should be observed when using the single-ended mode such that the input voltage to the ADC does not exceed the internal reference voltage, especially if the supply voltage is greater than 2.7V.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 16 Clocks-per-Conversion Digital Timing The control bits for conversion n + 1 can be overlapped with conversion n to allow for a conversion every 16 clock cycles, as shown in Figure 11. This figure also shows possible serial communication occurring with other serial peripherals between each byte transfer from the processor to the converter. (16 clocks cycles are possible, provided that each conversion completes within 1.6ms of starting.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 +VCC S 2.7V, +VCC S IOVDD S 1.5V, CLOAD = 50pF MIN TYP MAX SYMBOL DESCRIPTION tACQ tDS Acquisition Time 1.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 POWER DISSIPATION There are two major power modes for the TSC2046E: full-power (PD0 = 1) and auto power-down (PD0 = 0). When operating at full speed and 16 clocks-per-conversion (see Figure 11), the TSC2046E spends most of the time acquiring or converting. There is little time for auto power-down, assuming that this mode is active. Therefore, the difference between full-power mode and auto power-down is negligible.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 LAYOUT The following layout suggestions provide the most optimum performance from the TSC2046E. Many portable applications, however, have conflicting requirements concerning power, cost, size, and weight. In general, most portable devices have fairly clean power and grounds because most of the internal components are very low power. This situation means less bypassing for the converter power and less concern regarding grounding.
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" #$%&' www.ti.com SBAS417B − JUNE 2007 − REVISED JANUARY 2008 Revision History DATE REV 1/08 B 8/07 A PAGE SECTION 3, 4 Electrical Characteristics 13 Temperature Measurement 5 Pin Configuration DESCRIPTION Fixed typos in conditions header and in Note (6). Fixed typos in Equations (1) and (2). Added note to QFN package. NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TSC2046EIPWR TSSOP PW 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 TSC2046EIRGVR VQFN RGV 16 2500 330.0 12.4 4.3 4.3 1.5 8.0 12.0 Q2 TSC2046EIRGVT VQFN RGV 16 250 180.0 12.4 4.3 4.3 1.5 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TSC2046EIPWR TSC2046EIRGVR TSSOP PW 16 2000 367.0 367.0 35.0 VQFN RGV 16 2500 338.1 338.1 20.6 TSC2046EIRGVT VQFN RGV 16 250 210.0 185.0 35.0 TSC2046EIZQCR BGA MICROSTAR JUNIOR ZQC 48 2500 338.1 338.1 20.6 TSC2046EIZQCT BGA MICROSTAR JUNIOR ZQC 48 250 210.0 185.0 35.
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