Infineon Technologies CY8C20247-24LKXI

Overview

CY8C20247-24LKXI from Cypress Semiconductor is a 1.8 V CapSense® controller with SmartSense™ auto-tuning, featuring 31 capacitive sensing inputs, 6 slider channels, and proximity sensing capability. It integrates an M8C 8-bit Harvard-architecture CPU (24 MHz max), 8 KB flash/1 KB SRAM, I²C slave (up to 400 kHz), and driven-shield support on five GPIOs for water-tolerant HMI designs in consumer electronics front panels.

For engineers reviewing the CY8C20247-24LKXI datasheet, CY8C20247-24LKXI pinout, CY8C20247-24LKXI application, or CY8C20247-24LKXI equivalent, key selection criteria include capacitive input count (31), SmartSense_EMC_PLUS runtime auto-tuning, driven-shield GPIO count (5), low-power deep-sleep current (0.1 µA), and QFN-48 package compatibility with overlay thickness up to 15 mm glass.

Technical Context

The device implements a dedicated CapSense PSoC block with patented CSD PLUS™ sigma-delta sensing architecture, enabling high-sensitivity (0.1 pF) measurement and best-in-class SNR. Its analog system includes internal 1.0 V/1.2 V reference, programmable IDAC, and global analog mux supporting ganged proximity sensors.

SmartSense_EMC_PLUS operates autonomously during runtime-dynamically adjusting scan parameters, baseline tracking, and noise rejection thresholds without CPU intervention. The driven-shield function on five GPIOs actively cancels parasitic capacitance, enabling robust operation with long traces, metal proximity, and wet-surface conditions.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pin count and layout optimized for 31-sensor routing, I²C signal isolation, and driven-shield trace separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MTCH101-I/ST and AT42QT2120-MMHR, CY8C20247-24LKXI uniquely delivers 31-input scalability, runtime SmartSense_EMC_PLUS tuning, and five driven-shield pins-making it the only option for large-format, metal-near, or wet-environment capacitive HMIs requiring zero-touch calibration.

Availability

CY8C20247-24LKXI is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI overlays, medical device keypads, and automotive cabin switches requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20247-24LKXI 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

Cypress Semiconductor (now part of Infineon Technologies) designs programmable mixed-signal ICs for embedded control, sensing, and connectivity applications, with global R&D and manufacturing infrastructure.

CY8C20xx7/S is part of Cypress's CapSense® PSoC® family-engineered specifically for robust, self-calibrating capacitive human-machine interfaces in harsh or variable environments.

FAQ

What is the maximum overlay thickness supported by CY8C20247-24LKXI?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, verified under standard lab conditions with SmartSense_EMC_PLUS enabled and driven-shield configured on critical sensor channels. Performance remains stable across temperature (–40 °C to +85 °C) and humidity (up to 95% RH non-condensing) when layout guidelines are followed.

Does CY8C20247-24LKXI require external tuning components?

No external tuning components are required. All capacitive sensing is performed using internal IDACs, sigma-delta modulators, and the CSD PLUS™ algorithm. The only external components needed are a 32.768 kHz crystal (optional, for precision sleep timing) and decoupling capacitors-no external resistors, capacitors, or calibration potentiometers.

Can CY8C20247-24LKXI operate from a 3.3 V supply?

Yes-it operates across 1.71 V to 5.5 V, including standard 3.3 V rails. At 3.3 V, the internal LDO regulates core voltage to 1.8 V for the CapSense block, while I/Os remain at 3.3 V, enabling direct interfacing with 3.3 V microcontrollers and level-shift-free I²C communication.

How many GPIOs support driven-shield functionality?

Exactly five GPIOs support driven-shield: P3[0], P3[1], P3[4], P3[5], and P3[6]. These pins can be independently configured in hardware to output an inverted copy of the sensor excitation signal, reducing parasitic coupling and enabling reliable operation with long traces (>10 cm) or near metal structures.