Infineon Technologies CY8C20667S-24LQXIT

Overview

CY8C20667S-24LQXIT from Cypress Semiconductor is a 1.8 V CapSense® controller with SmartSense™ auto-tuning, supporting up to 31 capacitive buttons, 6 sliders, and proximity sensing on a single chip. It integrates an M8C 8-bit Harvard-architecture CPU (24 MHz), 32 KB flash/2 KB SRAM, driven-shield capability on five GPIOs, and operates from 1.71–5.5 V across –40°C to +85°C for industrial HMI applications.

For engineers reviewing the CY8C20667S-24LQXIT datasheet, CY8C20667S-24LQXIT pinout, CY8C20667S-24LQXIT application, or CY8C20667S-24LQXIT equivalent, key selection criteria include sensor count (31), SmartSense_EMC_PLUS runtime auto-tuning, driven-shield support for water tolerance, I²C slave (up to 400 kHz), and low-power deep sleep (0.1 µA typical).

Technical Context

The device implements a dedicated CapSense PSoC block with Capacitive Sigma Delta PLUS (CSD PLUS™) sensing algorithm, enabling high-sensitivity (0.1 pF) detection through 15 mm glass or 5 mm plastic overlays. Its analog system includes internal 1.0/1.2 V reference, programmable IDAC, and global analog bus for ganged proximity sensor construction.

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 supports trace lengths up to 100 pF load at 3 MHz and maintains robustness against metal interference and moisture.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad.

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, CY8C20667S-24LQXIT provides integrated MCU execution, hardware-driven shield, and autonomous SmartSense_EMC_PLUS-enabling complex, self-calibrating HMI systems without host dependency or manual tuning effort.

Availability

CY8C20667S-24LQXIT is available at Aetrix Electronics and suitable for industrial HMI, medical device interfaces, home appliance control panels, and consumer proximity-sensing applications requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20667S-24LQXIT 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 with focus on reliability and integration.

CY8C20xx7/S belongs to the CapSense® PSoC® family-engineered specifically for robust, self-tuning capacitive human interface applications in harsh electrical environments.

FAQ

What is the maximum overlay thickness supported by CY8C20667S-24LQXIT?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, enabled by its 0.1 pF capacitance resolution and CSD PLUS™ sensing algorithm. This performance is verified under standard lab conditions with SmartSense_EMC_PLUS active and driven-shield enabled on designated GPIOs.

Does CY8C20667S-24LQXIT require external tuning components?

No external tuning components are required. SmartSense_EMC_PLUS automatically configures scan parameters-including IDAC settings, modulation clock, and baseline tracking-during runtime. Only the modulator capacitor (C_external) on P0[1] or P0[3] is mandatory per the datasheet.

Can CY8C20667S-24LQXIT operate from a single 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, it delivers full functionality: 24 MHz CPU speed, 31-sensor scanning, I²C at 400 kHz, and driven-shield output compliance. No level-shifting or voltage translation is needed for GPIOs.

How many independent proximity zones can be implemented using the analog bus?

The internal analog bus allows up to four independent ganged proximity zones, each formed by connecting up to eight GPIOs via hardware mux. Each zone operates with separate baseline tracking and sensitivity calibration, confirmed in Cypress Application Note AN71079.