Infineon Technologies CY8C20467S-24LQXI

Overview

CY8C20467S-24LQXI from Cypress Semiconductor is a 1.8 V CapSense® controller IC with SmartSense™ auto-tuning, implementing a dedicated M8C 8-bit Harvard-architecture CPU (24 MHz max), 31 capacitive sensing inputs, 6 slider channels, and proximity sensing capability. It integrates 8 KB flash, 1 KB SRAM, I²C slave (up to 400 kHz), SPI master/slave, three 16-bit timers, and a 10-bit ADC - deployed in human-machine interface (HMI) systems requiring robust touch through thick overlays (15 mm glass).

For engineers reviewing the CY8C20467S-24LQXI datasheet, CY8C20467S-24LQXI pinout, CY8C20467S-24LQXI application, or CY8C20467S-24LQXI equivalent, key selection criteria include CSD PLUS™ sensing SNR, SmartSense_EMC_PLUS runtime auto-tuning, driven-shield GPIO support, low-power deep-sleep current (0.1 µA), and QFN-48 package compatibility with industrial HMI and proximity-sensing designs.

Technical Context

The device implements a dedicated CapSense analog subsystem with patented Capacitive Sigma Delta PLUS (CSD PLUS™) sensing algorithm, delivering 0.1 pF sensitivity and high SNR for overlay thickness up to 15 mm (glass) or 5 mm (plastic). Its SmartSense_EMC_PLUS auto-tuning continuously adjusts sensor parameters-including IDAC, scan resolution, and baseline tracking-during operation without CPU intervention.

It features a configurable internal analog mux bus connecting all GPIOs to the CapSense block and comparators, enabling ganged proximity sensors and flexible routing. The on-chip 1.2 V analog reference and LDO regulator provide stable PSRR, while five GPIOs support driven-shield functionality for water tolerance and metal-immune proximity detection.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad (LQX suffix per Cypress ordering code).

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 STM32F072CBT6, CY8C20467S-24LQXI delivers turnkey capacitive sensing with hardware-accelerated CSD PLUS™, zero-calibration SmartSense_EMC_PLUS, and integrated driven-shield - reducing time-to-market for robust, production-ready HMI designs by eliminating sensor tuning iterations.

Availability

CY8C20467S-24LQXI is available at Aetrix Electronics and suitable for industrial control panels, appliance touch interfaces, proximity-based occupancy sensors, and medical device user interfaces requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20467S-24LQXI 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 system-on-chip solutions for embedded control, connectivity, and sensing applications, with global R&D and manufacturing infrastructure.

CY8C20xx7/S belongs to Cypress's CapSense® controller product line, engineered specifically for production-ready capacitive touch and proximity sensing - prioritizing noise immunity, overlay flexibility, and zero-calibration deployment in consumer, industrial, and medical HMI systems.

FAQ

What is the maximum overlay thickness supported by CY8C20467S-24LQXI?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, validated using its CSD PLUS™ sensing algorithm and SmartSense_EMC_PLUS auto-tuning. This capability is measured under IEC 61000-4-3 radiated immunity conditions at 30 V/m, with no firmware adjustment required across the full operating temperature range (–40 °C to +85 °C).

Does CY8C20467S-24LQXI require external components for basic CapSense operation?

No external components are required for fundamental CapSense operation: the internal modulator capacitor (C_MOD) and reference capacitor (C_REF) are integrated. Only a single external 1 nF decoupling capacitor on VDD and standard PCB layout practices (guard traces, ground plane) are needed - driven-shield functionality uses internal circuitry and requires no external drivers or op-amps.

How does SmartSense_EMC_PLUS differ from basic SmartSense auto-tuning?

SmartSense_EMC_PLUS extends baseline SmartSense with real-time electromagnetic compatibility adaptation: it dynamically adjusts IDAC current, scan resolution, and baseline update rate based on instantaneous noise floor measurements. Unlike basic SmartSense, it maintains SNR >45 dB under simultaneous conducted (IEC 61000-4-6) and radiated (IEC 61000-4-3) interference - confirmed in Cypress Application Note AN95147.

Can CY8C20467S-24LQXI operate from a 3.3 V supply while maintaining 1.8 V CapSense performance?

Yes - the device operates across 1.71 V to 5.5 V and internally regulates the CapSense analog block to 1.2 V or 1.8 V regardless of VDD. At 3.3 V supply, the internal LDO ensures stable analog reference and CSD PLUS™ performance identical to 1.8 V operation, including 0.1 pF sensitivity and SmartSense_EMC_PLUS convergence time (<200 ms after power-up).