Texas Instruments TSC2008IRGVT

Overview

TSC2008IRGVT from Texas Instruments is a 12-bit, nanopower, 4-wire resistive touch screen controller with SPI interface, operating from 1.2V to 3.6V supply, featuring ratiometric conversion, on-chip temperature sensing (±2°C accuracy), and touch pressure measurement. It delivers up to 10kHz effective throughput at 12-bit resolution and integrates preprocessing logic to reduce host bus activity in portable handheld systems.

For engineers reviewing the TSC2008IRGVT datasheet, TSC2008IRGVT pinout, TSC2008IRGVT application, or TSC2008IRGVT equivalent, this device supports low-voltage battery-powered designs requiring precise X/Y coordinate acquisition, Z-pressure estimation, and ambient temperature monitoring - especially where ESD robustness (±15kV contact), ultra-low quiescent current (30.4µA @ 1.2V), and compact QFN-16 packaging are critical.

Technical Context

The TSC2008IRGVT implements a SAR ADC architecture with internal clock generation (1.6–1.91MHz at 12-bit mode), integrated touch panel drivers, and a programmable 8-/12-bit resolution command interface compatible with TSC2046. Its analog front-end includes low-on-resistance switches (X+/Y+ ≤6Ω, X−/Y− ≤5Ω) and dual diode-based temperature sensing (TEMP1/TEMP2) for differential or calibrated absolute measurement.

It uses a CMOS-compatible SPI slave interface (CPOL=0, CPHA=0) supporting up to 25MHz SCLK, with digital I/Os compliant across 1.2–3.6V VDD. PENIRQ is a buffered, programmable-pull-up interrupt output synchronized to conversion completion, and preprocessing includes median + averaging filtering (MAV) to suppress noise without host intervention.

Key Specifications

Pinout & Package

Package: 16-pin QFN (4 mm × 4 mm, RGV), thermally enhanced with exposed pad internally connected to substrate (recommended to connect to analog ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSC2046IPW and ADS7843E, the TSC2008IRGVT delivers superior power efficiency (13× lower current), integrated ESD protection eliminating external components, and on-chip temperature sensing - making it optimal for next-generation portable medical, industrial, and consumer touch interfaces where size, battery life, and robustness are prioritized.

Availability

TSC2008IRGVT is available at Aetrix Electronics and suitable for portable media players, industrial handheld terminals, and smart home control panels requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TSC2008IRGVT 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 TSC2008IRGVT belongs to TI's touch screen controller product line, designed specifically for ultra-low-power, battery-operated handheld devices requiring high-accuracy resistive touch sensing, integrated diagnostics, and robust ESD performance in compact form factors.

FAQ

What is the minimum supply voltage supported by the TSC2008IRGVT?

The TSC2008IRGVT operates down to 1.2V, enabling direct interface with single-cell lithium batteries across their full discharge curve (typically 4.2V to 2.8V for Li-ion, but also compatible with 1.5V alkaline). This low-voltage capability eliminates the need for intermediate regulators in space-constrained portable designs, and all specifications - including 12-bit linearity and 10kHz throughput - are guaranteed across the 1.2V–3.6V range. The TSC2008IRGVT maintains full functionality even at 1.2V, unlike many competing controllers that require ≥2.7V.

Does the TSC2008IRGVT support both 4-wire and 5-wire touch screens?

The TSC2008IRGVT is explicitly designed for 4-wire resistive touch screens only, as confirmed by its pinout (X+, X−, Y+, Y−), internal driver architecture, and datasheet specifications. It does not support 5-wire configurations - which require separate Z1/Z2 sensing and different switching topology - nor does it include the necessary fifth electrode driver or associated control logic. Using the TSC2008IRGVT with a 5-wire panel would result in incomplete or erroneous coordinate acquisition. For 5-wire applications, TI recommends the TSC2007 or other dedicated 5-wire controllers.

How does the TSC2008IRGVT achieve ±2°C temperature measurement accuracy?

The TSC2008IRGVT achieves ±2°C accuracy using its dual-diode (TEMP1/TEMP2) differential measurement method, which cancels out process-related offset and gain errors without requiring factory calibration. The device measures the voltage difference between two diodes with a fixed 91:1 resistance ratio, leveraging the known thermal coefficient (–2.1mV/°C) to compute absolute temperature via ΔV = V_BE(TEMP2) − V_BE(TEMP1). This method is implemented entirely within the TSC2008IRGVT's analog front-end and requires no external components or host-side compensation algorithms.

Can the TSC2008IRGVT operate without an external reference voltage?

Yes - the TSC2008IRGVT uses its VDD/REF pin as both power supply and ADC reference, enabling true ratiometric conversion. When VDD varies (e.g., due to battery discharge), the ADC full-scale range scales proportionally, preserving measurement accuracy of X/Y ratios and eliminating the need for a stable external reference. This architecture makes the TSC2008IRGVT inherently tolerant to supply ripple and droop, and no external reference component is required. However, if higher absolute accuracy is needed, an external reference can be applied to VDD/REF while powering the core from a separate VDD rail (not supported in standard configuration).

What is the purpose of the MAV filter in the TSC2008IRGVT?

The MAV (Median + Averaging) filter in the TSC2008IRGVT is an on-chip digital preprocessing block that reduces noise and spurious touch readings before data is sent to the host processor. It applies median filtering to reject outliers (e.g., ESD-induced glitches) followed by averaging to smooth stochastic noise - all without host CPU involvement. This reduces SPI bus traffic by up to 7× compared to raw sample streaming, lowers host processing load, and improves touch response consistency in electrically noisy environments like LCD-backlit displays. The MAV filter is enabled by default and configurable via command register.