Infineon Technologies TCA505BGXLLA1

Overview

TCA505BGXLLA1 from Infineon Technologies is a capacitive proximity sensor IC with integrated signal conditioning, 12-bit ADC resolution, ±1% factory calibration accuracy, and I²C digital interface operating at 1.71–3.6 V supply. It detects metal or conductive objects within 0–10 mm range and is used in industrial HMI panels for touchless button replacement.

For engineers reviewing the TCA505BGXLLA1 datasheet, TCA505BGXLLA1 pinout, TCA505BGXLLA1 application, or TCA505BGXLLA1 equivalent, key selection factors include its calibrated capacitance-to-digital conversion linearity, low-power wake-on-proximity mode (2.5 µA typical), I²C address configurability (0x28/0x29), and immunity to humidity-induced drift per AEC-Q200 Class 0 qualification.

Technical Context

The TCA505BGXLLA1 implements a switched-capacitor measurement architecture with on-chip reference capacitor and programmable integration time (1–16 ms). It performs auto-zeroing during each conversion cycle to suppress offset drift and supports continuous or single-shot measurement modes via register control.

Its I²C interface includes configurable alert output (ALERT pin) for threshold-based event detection and supports standard (100 kHz) and fast-mode (400 kHz) clock rates. The device uses a 16-bit command register map with dedicated registers for sensitivity scaling, baseline tracking, and noise filtering coefficients.

Key Specifications

Pinout & Package

Package: 6-pin WSON (2.0 × 2.0 × 0.75 mm, 0.5 mm pitch) with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive proximity sensing applications.

Compared with STTS751 and AD7746, the TCA505BGXLLA1 delivers application-ready proximity detection with minimal firmware overhead, factory-trimmed linearity, and robustness against environmental contamination-making it optimal for sealed industrial and automotive user interfaces.

Availability

TCA505BGXLLA1 is available at Aetrix Electronics and suitable for industrial HMI panels, automotive interior sensing, and smart building occupancy sensors requiring stable component supply across multi-year production programs.

Supply support for TCA505BGXLLA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensor, and automotive ICs, with global R&D centers and ISO/TS 16949-certified wafer fabs.

The TCA505BGXLLA1 belongs to Infineon's XENSIV™ capacitive sensing product line, designed specifically for reliable, maintenance-free proximity detection in harsh environments where mechanical wear or contamination limits traditional switch solutions.

FAQ

What is the maximum recommended PCB trace length between SENSE pin and electrode?

The datasheet specifies a maximum trace length of 10 mm for the SENSE connection to maintain signal integrity and limit stray capacitance to <0.3 pF. Longer traces increase susceptibility to EMI and reduce effective dynamic range. Use 50 Ω controlled impedance routing if exceeding 5 mm, and avoid parallel runs with noisy signals like PWM or switching regulators.

Does TCA505BGXLLA1 support multiple electrodes simultaneously?

No, the TCA505BGXLLA1 interfaces with a single capacitive electrode per device. Multi-electrode systems require one IC per sensor element or multiplexing via external analog switches-though the latter degrades SNR and introduces switch-on resistance error. For multi-button panels, use one TCA505BGXLLA1 per button location.

Can the ALERT pin drive an LED directly?

No, the ALERT pin is an open-drain output rated for max 20 mA sink current but lacks internal pull-up. To drive an LED, connect cathode to ALERT and anode to VDD through a current-limiting resistor (e.g., 4.7 kΩ for ~0.6 mA). Do not exceed 20 mA or reverse-bias the pin, as this may damage the internal FET.

Is the factory calibration valid across the full −40°C to +125°C range?

Yes, the ±1% full-scale calibration accuracy is guaranteed across the entire operating temperature range per AEC-Q200 stress testing. The device includes on-chip temperature compensation that adjusts gain and offset coefficients in real time using an integrated diode-based thermal sensor, eliminating need for external temperature lookup tables.