Texas Instruments TSC2000IPWG4

Overview

TSC2000IPWG4 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, uses SPI serial interface, and delivers ratiometric conversion for position and pressure measurement in handheld PDA systems.

For engineers reviewing the TSC2000IPWG4 datasheet, TSC2000IPWG4 pinout, TSC2000IPWG4 application, or TSC2000IPWG4 equivalent, key selection considerations include its TSSOP-20 package, integrated PENIRQ and DAV interrupt signaling, programmable sampling rates up to 125 kHz, and support for touch-pressure calculation via Z1/Z2 measurements - all critical for low-power, space-constrained human-interface designs.

Technical Context

The TSC2000IPWG4 implements a successive-approximation-register (SAR) A/D converter with capacitive redistribution architecture, enabling built-in sample-and-hold functionality. Its ratiometric differential mode eliminates errors from driver switch on-resistance (typ. 6.5 Ω at 25°C), while internal 2.5 V/1.25 V references support both touch-screen and auxiliary measurements.

Control is register-based via 16-bit SPI commands (CPOL=0, CPHA=1), with two memory pages (Data and Control) managing X/Y/Z/BAT/AUX/TEMP registers and configuration including ADC resolution (8/10/12-bit), panel voltage stabilization delay, and reference selection. Touch detection uses a dedicated PENIRQ path with precharge circuitry to mitigate screen capacitance effects.

Key Specifications

Pinout & Package

TSSOP-20 package (4.4 mm × 6.5 mm, 0.65 mm pitch), thermally enhanced with θ_JA = 93°C/W; suitable for compact portable PCB layouts with minimal footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7843IPWR, TSC2000IPWG4 delivers full-system integration (touch + battery + temp + D/A), reducing component count and firmware complexity; versus TSC2007IPW, it trades minor performance gains for proven qualification in legacy portable designs with established supply chains.

Availability

TSC2000IPWG4 is available at Aetrix Electronics and suitable for handheld PDAs, cellular phones, and MP3 players requiring stable component supply, long-lifecycle support, and qualified industrial-grade analog interface solutions.

Supply support for TSC2000IPWG4 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 decades of expertise in precision data converters and human-interface solutions.

The TSC2000IPWG4 belongs to TI's touch-screen controller product line, designed specifically for cost-sensitive, battery-powered portable devices requiring integrated analog signal conditioning, low-power operation, and robust mechanical interface support.

FAQ

What is the maximum sampling rate supported by the TSC2000IPWG4?

The TSC2000IPWG4 supports programmable sampling rates up to 125 kHz in 12-bit mode. This rate is achievable using the internal 8 MHz oscillator divided appropriately for the selected resolution - for example, a 2 MHz conversion clock enables accurate 12-bit conversions. The actual sustained rate depends on configured panel stabilization delays and host SPI throughput, but the device's architecture permits this peak performance for fast touch-response applications like gesture recognition in PDAs.

Does the TSC2000IPWG4 require an external reference voltage?

No, the TSC2000IPWG4 does not require an external reference voltage. It integrates factory-trimmed 2.5 V and 1.25 V internal references, selectable via the Reference Control Register. These references are used for auxiliary inputs, battery monitoring, and temperature measurement. For optimal touch-screen accuracy, the device uses ratiometric conversion - referencing the touch-panel drive voltage directly - eliminating dependence on reference stability and simplifying system design.

How does the TSC2000IPWG4 handle touch-pressure measurement?

The TSC2000IPWG4 supports touch-pressure (Z-axis) measurement using two methods: Z1/Z2 cross-panel readings or combined X/Y/Z1 analysis, both implemented in hardware. It stores Z1 and Z2 results in dedicated registers (02h and 03h) and provides 8-bit resolution mode optimized for pressure calculation speed and reduced power. The device outputs raw digital values that firmware converts to resistance using documented equations - no on-chip pressure-to-force translation is performed, preserving design flexibility.

What is the function of the ARNG pin on the TSC2000IPWG4?

The ARNG (Analog Range) pin on the TSC2000IPWG4 sets the full-scale output current range of the integrated 8-bit D/A converter. Connecting a resistor between ARNG and GND determines the DAC's compliance current - for example, a 1.8 kΩ resistor yields ~650 µA max output. This current drives external LCD contrast circuits, and the ARNG pin's voltage is internally regulated to maintain linearity and temperature stability across the DAC's operating range.

Can the TSC2000IPWG4 operate with a 5 V supply?

No, the TSC2000IPWG4 cannot operate with a 5 V supply. Its absolute maximum VDD rating is +6 V, but specified operational performance is guaranteed only from 2.7 V to 3.6 V. Supplying 5 V violates the recommended operating conditions and risks parametric degradation or permanent damage. For 5 V systems, level-shifting or regulation to ≤3.6 V is required on the VDD and digital I/O lines to ensure reliable TSC2000IPWG4 operation and avoid exceeding input voltage limits on MOSI, SCLK, or SS pins.