Texas Instruments TSC2000IPWR

Overview

TSC2000IPWR from Texas Instruments is a 12-bit programmable-resolution analog interface IC for resistive 4-wire touch screens, integrating A/D conversion, on-chip temperature sensing (±2°C accuracy), dual battery monitoring (0.5–6 V), and an 8-bit current-output D/A converter for LCD contrast control. It operates from a single 2.7–3.6 V supply, features ratiometric conversion, and communicates via SPI with PENIRQ and DAV interrupt signaling.

For engineers reviewing the TSC2000IPWR datasheet, TSC2000IPWR pinout, TSC2000IPWR application, or TSC2000IPWR equivalent, key selection considerations include its integrated touch-pressure measurement capability, internal 2.5 V reference with 20 ppm/°C drift, 125 kHz max sampling rate, and TSSOP-20 package compatibility with PDA and handheld UI subsystems.

Technical Context

The TSC2000IPWR implements a successive-approximation register (SAR) A/D converter with capacitive redistribution architecture, supporting differential ratiometric mode for touch position (X/Y) and pressure (Z) measurements. Its internal 8 MHz oscillator feeds programmable division logic to generate conversion clocks optimized for 8-/10-/12-bit resolution - e.g., 2 MHz for full 12-bit accuracy.

It integrates dedicated touch-screen drivers with low on-resistance (<7 Ω at +25°C), automatic panel voltage stabilization timing control, and dual-mode PENIRQ generation: power-down detection (Y– to GND pull-down) and active-measurement interruption. The SPI interface uses CPOL = 0 / CPHA = 1 timing and supports 16-bit command-word addressing across two memory pages (Data and Control).

Key Specifications

Pinout & Package

TSSOP-20 package: 0.65 mm lead pitch, 4.4 mm × 6.5 mm body, exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar touch-screen interface applications.

Compared with ADS7843IPWR, TSC2000IPWR reduces system component count by integrating battery monitoring, temperature sensing, and LCD contrast control; compared with TSC2007IPWR, it offers proven field reliability in legacy handheld platforms but lacks auto-scan and extended temperature rating.

Availability

TSC2000IPWR is available at Aetrix Electronics and suitable for handheld consumer electronics, industrial HMI terminals, and portable media players requiring stable component supply and long-term obsolescence management.

Supply support for TSC2000IPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision data converters and human-interface solutions.

The TSC2000IPWR belongs to TI's PDA analog interface product line, designed specifically to consolidate touch-screen control, power monitoring, and display management functions into a single IC for space-constrained portable devices.

FAQ

What is the maximum sampling rate supported by the TSC2000IPWR?

The TSC2000IPWR supports up to 125 kHz sampling rate in 8-bit mode. At 12-bit resolution, the maximum reliable rate is 125 kHz only when using a 2 MHz conversion clock; higher resolutions require slower clock division to maintain accuracy, with typical 12-bit operation at ~50–80 kHz depending on panel stabilization settings and averaging configuration. The internal 8 MHz oscillator provides the base clock for all timing functions.

Does the TSC2000IPWR support both single-ended and differential input modes?

Yes, the TSC2000IPWR supports both modes: ratiometric differential mode for touch-screen X/Y/Z measurements (which rejects reference drift), and single-ended mode for battery monitoring (VBAT1/VBAT2), temperature sensing (TEMP1/TEMP2), and auxiliary inputs (AUX1/AUX2). The Reference Control Register selects between internal 1.25 V or 2.5 V references, or disables them for external reference use on the VREF pin.

How does the TSC2000IPWR detect screen touch and generate PENIRQ?

The TSC2000IPWR detects touch using an internal 50 kΩ pull-up on the X+ line connected to PENIRQ while in power-down mode. When the screen is pressed, X+ is shorted to Y– (grounded), pulling PENIRQ low to signal the host processor. During active conversion, the pull-up is disconnected to prevent leakage-induced measurement error. This hardware-based detection requires no host polling and consumes only 3 µA in standby.

Can the TSC2000IPWR measure touch pressure (Z-axis) accurately?

Yes, the TSC2000IPWR supports two validated Z-axis measurement methods using Z1 and Z2 cross-panel readings or combined X/Y/Z1 calculations per TI Application Report SBAS257. It achieves usable pressure discrimination with 8-bit resolution mode recommended for speed and reduced noise sensitivity. Accuracy depends on known X-plate resistance and proper panel calibration, but the IC provides all necessary control registers and timing flexibility to implement either method reliably.

What is the function of the ARNG pin on the TSC2000IPWR?

The ARNG pin on the TSC2000IPWR sets the full-scale output current range of the 8-bit current-output D/A converter (AOUT). A resistor connected from ARNG to GND determines the DAC's maximum current - e.g., 10 kΩ yields ~650 µA - enabling precise, hardware-calibrated LCD contrast control without software gain adjustment. This simplifies display tuning and improves system stability across temperature and supply variations.