Infineon Technologies CY8C20247S-24LKXI

Overview

CY8C20247S-24LKXI from Cypress Semiconductor is a 1.8 V CapSense® controller with SmartSense™ auto-tuning, integrating an M8C 8-bit Harvard-architecture CPU (24 MHz max), 8 KB flash, 1 KB SRAM, and dedicated hardware for capacitive sensing across 31 buttons, 6 sliders, and proximity sensors. It delivers 0.1 pF sensitivity, 28 µA/sensor active current (125 ms scan interval), and operates from –40 °C to +85 °C in a 48-pin QFN package.

For engineers reviewing the CY8C20247S-24LKXI datasheet, CY8C20247S-24LKXI pinout, CY8C20247S-24LKXI application, or CY8C20247S-24LKXI equivalent, key selection criteria include capacitive sensing channel count, SmartSense_EMC_PLUS runtime auto-tuning capability, I2C slave timing (50/100/400 kHz), driven shield support on five GPIOs, and low-power deep sleep (0.1 µA typical).

Technical Context

The device implements a dedicated CapSense analog block using patented CSD PLUS™ sigma-delta modulation, enabling direct capacitive measurement without external components. Its internal 1.0 V analog reference and configurable IDACs support overlay thicknesses up to 15 mm (glass) and 5 mm (plastic), while QuietZone™ logic suppresses noise from conducted/radiated sources.

SmartSense_EMC_PLUS continuously adjusts sensor parameters-including IDAC value, scan resolution, and baseline tracking-during operation to maintain SNR and reject environmental drift. The Harvard-architecture M8C core executes firmware independently of sensing operations, allowing concurrent system control and real-time touch response.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20247S-24LKXI, CY8C201A0-SX240 trades sensing scalability and robustness for footprint and cost, while MTCH101-I/ST eliminates MCU overhead but forfeits runtime adaptability and multi-sensor topology support.

Availability

CY8C20247S-24LKXI is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI interfaces, medical device keypads, and automotive cabin proximity sensors requiring stable component supply across extended product lifecycles.

Supply support for CY8C20247S-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.

This device belongs to the CY8C20xx7/S CapSense® controller family, engineered specifically for robust, self-calibrating capacitive user interfaces in harsh electrical and environmental conditions.

FAQ

What is the maximum overlay thickness supported by CY8C20247S-24LKXI?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, validated using its 0.1 pF sensitivity and CSD PLUS™ algorithm with SmartSense_EMC_PLUS auto-tuning. Performance remains stable under moisture and temperature variation due to continuous baseline compensation and driven-shield electrode support.

Does CY8C20247S-24LKXI require external tuning components?

No external tuning components are required. All capacitive sensing is performed using on-chip IDACs, sigma-delta modulators, and the dedicated CapSense PSoC block. The SmartSense_EMC_PLUS feature automatically configures IDAC values, scan resolution, and filtering parameters during runtime without host MCU involvement.

Can CY8C20247S-24LKXI operate from a single 1.8 V supply?

Yes - it operates from 1.71 V to 5.5 V, with full functionality including CapSense scanning, I2C communication, and CPU execution at 1.8 V nominal. The internal LDO regulates analog circuitry to 1.0 V or 1.2 V, ensuring consistent sensing performance independent of supply rail fluctuations.

How many GPIOs support driven-shield functionality?

Exactly five GPIO pins (P0[0], P0[1], P0[2], P0[3], and P0[4]) support driven-shield mode, enabling active guard traces that reduce parasitic coupling in wet or high-noise environments. Each can drive up to 100 pF load at 3 MHz, verified per datasheet Section 20 (Shield Driver DC Specifications).