Infineon Technologies CY8C20447S-24LQXIT

Overview

CY8C20447S-24LQXIT 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), 31 capacitive sensing inputs, 6 slider channels, and proximity sensing capability. It delivers 0.1 pF sensitivity, 28 µA/sensor active current, and operates from 1.71–5.5 V across –40°C to +85°C - deployed in industrial HMI panels with thick glass overlays up to 15 mm.

For engineers reviewing the CY8C20447S-24LQXIT datasheet, CY8C20447S-24LQXIT pinout, CY8C20447S-24LQXIT application, or CY8C20447S-24LQXIT equivalent, key selection criteria include CSD PLUS™ sensing algorithm performance, driven-shield GPIO support for water tolerance, SmartSense_EMC_PLUS runtime auto-tuning, and I²C slave interface timing at 400 kHz.

Technical Context

The device implements a dedicated CapSense analog subsystem with Capacitive Sigma Delta PLUS (CSD PLUS™) sensing engine, enabling simultaneous scanning of up to 31 inputs using hardware-accelerated delta-sigma conversion and internal 1.0/1.2 V analog reference. It integrates a configurable analog mux bus connecting all GPIOs to the CapSense block and comparators.

SmartSense_EMC_PLUS operates autonomously during runtime to adjust sensor IDACs, scan resolution, and noise filtering parameters without CPU intervention - compensating for environmental drift, overlay aging, and PCB process variation while maintaining SNR > 60 dB under conducted/radiated EMI.

Key Specifications

Pinout & Package

48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pinout validated per Cypress Document #001-69257 Rev. *Q, Page 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MTCH101-I/ST and AT42QT2120-MAHR, CY8C20447S-24LQXIT uniquely combines embedded M8C processing, 31-input CSD PLUS™ sensing, and SmartSense_EMC_PLUS runtime adaptation - making it the only option supporting thick-glass industrial HMIs with zero manual tuning.

Availability

CY8C20447S-24LQXIT is available at Aetrix Electronics and suitable for industrial control panels, home appliance interfaces, and automotive cabin controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY8C20447S-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 applications, with global R&D and manufacturing infrastructure.

This device belongs to the PSoC® CapSense® family - engineered specifically for robust, self-calibrating capacitive user interfaces in harsh electrical environments and variable mechanical conditions.

FAQ

What is the maximum overlay thickness supported by CY8C20447S-24LQXIT?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, verified using its 0.1 pF sensitivity and CSD PLUS™ algorithm under IEC 61000-4-3 radiated immunity testing at 10 V/m. Performance remains stable across temperature due to SmartSense_EMC_PLUS real-time compensation of baseline drift.

Does CY8C20447S-24LQXIT require external tuning components?

No external tuning components are required. The device uses internal IDACs, programmable scan resolution, and hardware-based CSD PLUS™ conversion. Only one external modulator capacitor (Cexternal) is needed on P0[1] or P0[3], with value selected per overlay thickness - typically 2.2 nF for 15 mm glass.

Can CY8C20447S-24LQXIT operate in deep sleep while detecting proximity events?

Yes. In Deep Sleep mode (0.1 µA typical), the device uses its internal 32 kHz ILO to wake every 125 ms for proximity scan. Hardware-accelerated proximity detection triggers full wake-up only upon valid event - preserving battery life in always-on applications like automatic faucets or occupancy sensors.

How many GPIOs support driven-shield functionality?

Exactly five GPIOs support driven-shield mode: P0[0], P0[1], P0[2], P0[3], and P0[4]. These pins can be configured to output inverted sense signals synchronized to the CapSense modulator clock, reducing mutual capacitance coupling and improving water tolerance - confirmed in Cypress Application Note AN71079.