Infineon Technologies CY8C20437-24LQXIT

Overview

CY8C20437-24LQXIT from Cypress Semiconductor is a 1.8 V CapSense® controller with SmartSense™ auto-tuning, featuring 31 capacitive sensing inputs (buttons), 6 sliders, and proximity sensing capability. It integrates an M8C 8-bit Harvard-architecture CPU (24 MHz max), 8 KB flash/1 KB SRAM, and a dedicated CSD PLUS™ sigma-delta sensing engine delivering 0.1 pF sensitivity-enabling glass overlays up to 15 mm thick in human-machine interface applications for industrial control panels and consumer appliances.

For engineers reviewing the CY8C20437-24LQXIT datasheet, CY8C20437-24LQXIT pinout, CY8C20437-24LQXIT application, or CY8C20437-24LQXIT equivalent, key selection criteria include its integrated SmartSense_EMC_PLUS runtime auto-tuning, driven-shield support on five GPIOs for water tolerance, I²C slave (up to 400 kHz), and ultra-low deep-sleep current (0.1 µA typical) in 48-pin QFN packaging.

Technical Context

The device implements a dedicated CapSense analog subsystem using Capacitive Sigma Delta PLUS (CSD PLUS™) architecture, with hardware-accelerated scanning and noise rejection via QuietZone™ controller logic. It supports ganged proximity sensing through an internal analog bus and delivers SNR-optimized performance across conducted/radiated EMI environments.

Its M8C core operates at up to 24 MHz with four clock sources (IMO, ILO, external crystal, external clock), while system-level resources include three 16-bit timers, dual-mode GPIOs (analog/digital), 10-bit ADC with internal reference, two low-power comparators, and configurable I²C/SPI interfaces-all managed via PSoC Designer™ IDE without external tuning components.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pinout validated per Cypress datasheet 001-69257 Rev. *Q, pages 12 and 33–34.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20437-24LQXIT, CY8C20637-24LQXIT offers scalable memory for evolving firmware, while MTCH6302-I/ST reduces component count in host-driven architectures but adds software integration effort and removes standalone operation capability.

Availability

CY8C20437-24LQXIT is available at Aetrix Electronics and suitable for industrial control panels, home appliance interfaces, medical device keypads, and smart building occupancy sensors requiring stable component supply and long-term lifecycle support.

Supply support for CY8C20437-24LQXIT 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 focus on reliability and system integration.

CY8C20xx7/S belongs to Cypress's CapSense® PSoC® family - engineered specifically for self-contained, auto-tuned capacitive touch interfaces where minimal external components and production-line tuning independence are critical.

FAQ

What is the maximum overlay thickness supported by CY8C20437-24LQXIT?

The device supports up to 15 mm of glass or 5 mm of plastic overlay thickness, verified using its 0.1 pF capacitance resolution and CSD PLUS™ sensing algorithm under standard lab conditions per datasheet 001-69257 Rev. *Q, Section 1.2. Performance depends on electrode size, spacing, and shielding implementation.

Does CY8C20437-24LQXIT require external tuning components?

No external tuning components are required. SmartSense_EMC_PLUS auto-tuning dynamically adjusts sensor parameters-including IDAC current, scan speed, and baseline tracking-in real time during operation, eliminating manual calibration across manufacturing batches and environmental changes.

Can CY8C20437-24LQXIT operate from a 3.3 V supply?

Yes, it operates across 1.71 V to 5.5 V. At 3.3 V, all specifications-including 24 MHz CPU speed, 0.1 µA deep-sleep current, and full CapSense functionality-are guaranteed per DC electrical specifications table (Section 14, datasheet 001-69257 Rev. *Q).

How many GPIOs support analog functions like ADC or comparator inputs?

Up to 34 GPIOs are available, with analog mux routing enabling ADC input and comparator connections from any GPIO pin. The 10-bit ADC and two comparators share the internal analog bus, allowing flexible signal routing without fixed pin assignments.