Texas Instruments TSC2008TRGVRQ1

Overview

TSC2008TRGVRQ1 from Texas Instruments is an automotive-qualified 12-bit nanopower 4-wire resistive touch screen controller with integrated SAR ADC, SPI interface, on-chip temperature sensor, and preprocessing logic. It operates from 1.2V to 3.6V, consumes as low as 30.4μA at 1.2V/5MHz SCLK, supports ratiometric conversion, and delivers up to 10kHz effective throughput in 12-bit mode for handheld HMI systems.

For engineers reviewing the TSC2008TRGVRQ1 datasheet, TSC2008TRGVRQ1 pinout, TSC2008TRGVRQ1 application, or TSC2008TRGVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 2 qualification (–40°C to +105°C), programmable 8-/12-bit resolution, ±25kV air-gap ESD protection on touch inputs, digital buffered PENIRQ output, and compatibility with TSC2046 command protocol.

Technical Context

The TSC2008TRGVRQ1 implements a successive approximation register (SAR) ADC architecture with internal clock generation (1.6–3.82 MHz depending on VDD), differential reference support for ratiometric accuracy, and integrated switch drivers for X+/X−/Y+/Y− touch panel excitation. Its preprocessing logic reduces host bus traffic by performing median and averaging filtering (MAV) before data transmission.

It uses CMOS-level digital I/O with voltage-dependent VIH/VIL thresholds, supports SPI Mode 0 (CPOL=0, CPHA=0) up to 25MHz, and features auto power-down control via PD[1:0] bits. The device includes two temperature diodes (TEMP1/TEMP2) enabling both calibrated single-point and differential (no-calibration) ambient temperature measurement with ±2°C accuracy.

Key Specifications

Pinout & Package

Package: 4 × 4 mm QFN-16 with exposed thermal pad (RGV). Thermal pad may be connected to analog ground or left floating; must be isolated from digital ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSC2008TRGVRQ1, the TSC2046IPWQ1 offers pin-compatible legacy support but sacrifices 13× power efficiency and ESD robustness, while the ADS7843E provides cost-effective performance in non-automotive settings but lacks temperature sensing, preprocessing, and automotive qualification - making TSC2008TRGVRQ1 the optimal choice for safety-critical, battery-sensitive vehicle HMIs.

Availability

TSC2008TRGVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical devices, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TSC2008TRGVRQ1 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 automotive electronics, with decades of expertise in precision data converters and human-interface solutions.

The TSC2008-Q1 product line was designed specifically for ultra-low-power, high-ESD-resilience touch screen control in automotive and portable applications - delivering nanopower operation, integrated preprocessing, and AEC-Q100 qualification in a compact QFN package.

FAQ

What is the maximum SPI clock frequency supported by the TSC2008TRGVRQ1?

The TSC2008TRGVRQ1 supports SPI serial clock frequencies up to 25MHz when VDD ≥ 2.7V, 16MHz at 1.6V ≤ VDD < 2.7V, and 5.5MHz at 1.2V ≤ VDD < 1.6V. These limits ensure reliable timing margin across the full automotive temperature range (–40°C to +105°C) and maintain setup/hold compliance per the CPOL=0, CPHA=0 protocol. The TSC2008TRGVRQ1 uses the falling edge of SCLK to drive SDO and the rising edge to sample SDI.

How does the TSC2008TRGVRQ1 achieve ratiometric conversion?

The TSC2008TRGVRQ1 achieves ratiometric conversion by accepting differential reference inputs directly from the Y+ and Y− touch panel terminals via its internal REF multiplexer. When configured in differential mode, the ADC result represents the ratio of the sensed X+ (or Y+) voltage to the applied Y+–Y− voltage, inherently canceling errors from driver switch on-resistance and supply voltage drift. This configuration is enabled by connecting VDD/REF to the panel's excitation source and routing Y+/Y− to the +REF/–REF inputs - a capability unique to the TSC2008TRGVRQ1 among its predecessors.

Does the TSC2008TRGVRQ1 require an external reference voltage?

No, the TSC2008TRGVRQ1 does not require an external reference voltage. Its VDD/REF pin serves a dual purpose: it supplies power to the IC and simultaneously acts as the reference voltage for the 12-bit SAR ADC. The device supports ratiometric operation using the touch panel's own excitation voltage as reference, eliminating the need for a precision external reference. This simplifies layout, reduces BOM count, and improves system accuracy by tracking panel voltage variations directly.

What is the function of the PENIRQ pin on the TSC2008TRGVRQ1?

The PENIRQ pin on the TSC2008TRGVRQ1 is an open-drain, active-low interrupt output that signals pen/finger touch detection and conversion completion. It remains low during touch and transitions high at end-of-conversion (EOC), providing precise timing for host MCU synchronization. The TSC2008TRGVRQ1 includes on-chip programmable pull-up resistors (50kΩ or 90kΩ selectable via command register), eliminating the need for external pull-ups and enabling flexible interrupt polarity and timing control in space-constrained designs.

Can the TSC2008TRGVRQ1 measure touch pressure (Z-axis)?

Yes, the TSC2008TRGVRQ1 supports touch pressure measurement using two validated methods: the Z1/Z2 method (requiring X-plate resistance and two cross-panel measurements) and the X/Y-plate method (requiring both X- and Y-plate resistances plus one additional measurement). These calculations are performed internally using the same 12-bit ADC and preprocessing logic, delivering calibrated Z-resistance values without host CPU intervention. Pressure data is accessible via standard SPI reads alongside X/Y coordinates, enabling force-sensitive UI responses in automotive and medical applications.