Infineon Technologies CY8C20234-12SXIT

Overview

CY8C20234-12SXIT from Infineon Technologies (formerly Cypress) is a programmable 8-bit PSoC® System-on-Chip with integrated CapSense® capacitive sensing engine, M8C CPU core running at up to 12 MHz, 8 KB flash, 512 bytes SRAM, and operation from 2.4 V to 5.25 V across –40 °C to +85 °C industrial temperature range - deployed in human-interface touch control systems for appliances and industrial HMI.

For engineers reviewing the CY8C20234-12SXIT datasheet, CY8C20234-12SXIT pinout, CY8C20234-12SXIT application, or CY8C20234-12SXIT equivalent, key selection criteria include its dedicated hardware-accelerated CapSense block supporting up to 28 GPIO-based sensors, configurable I²C/SPI interfaces, internal 32-kHz low-power oscillator, and LDO-regulated 3.0-V digital I/O on Port 1.

Technical Context

The device implements a Harvard-architecture M8C CPU core with 12-MHz maximum clock speed and integrated CapSense analog subsystem featuring relaxation oscillator-based charge-transfer sensing, comparator-based noise-immune signal acquisition, and hardware scan sequencing - eliminating firmware overhead for baseline tracking and finger detection. It includes a global analog multiplexer enabling any GPIO to route to the CapSense block or analog reference.

System-level resources include an I²C slave supporting 50/100/400 kHz modes, SPI master/slave configurable from 46.9 kHz to 3 MHz, internal 1.8-V analog reference, and a 3.0-V/20-mA-port LDO with register-controlled bypass - all coordinated via interrupt controller and sleep/wake timers for ultra-low-power touch wake-up operation.

Key Specifications

Pinout & Package

Package: 28-pin SOIC (Small Outline Integrated Circuit), 300 mil width, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C20134-12SXIT, CY8C20234-12SXIT adds Port 1 LDO and full 28-GPIO CapSense flexibility; versus CY8C20334-12SXIT, it trades analog calibration features for lower cost and simpler firmware - making it optimal for fixed-threshold, single-layer touch HMI designs.

Availability

CY8C20234-12SXIT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI interfaces, smart thermostat front panels, and medical device touch keypads requiring stable component supply and long-term manufacturing continuity.

Supply support for CY8C20234-12SXIT 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains the PSoC® portfolio as part of its broader embedded control and human-interface solutions offering.

CY8C20234 belongs to the PSoC® 1 CapSense® family - designed specifically for cost-sensitive, low-power capacitive touch applications where integrated analog sensing, minimal external components, and rapid UI prototyping are essential.

FAQ

Does CY8C20234-12SXIT support I²C master mode?

No. The device implements only I²C slave functionality with configurable clock speeds (50/100/400 kHz). It cannot initiate transactions on the I²C bus. Host communication must be driven by an external master MCU or controller, which reads CapSense status registers or writes configuration values via standard I²C protocol.

Can the internal 3.0-V LDO on Port 1 be disabled?

Yes. A dedicated register bit enables LDO bypass mode, allowing Port 1 I/O to operate directly from VDD. This is useful when VDD is already regulated at 3.0 V or when higher drive voltage is needed for specific LED forward voltages - preserving power efficiency when regulation is unnecessary.

What is the maximum number of simultaneous CapSense sensors supported?

The device supports up to 28 independent capacitive sensing elements, each assignable to any GPIO pin. Hardware scan sequencing handles all 28 channels autonomously; however, practical limit depends on scan time budget and signal-to-noise ratio - typical implementations use 12–20 sensors for robust performance under ESD or moisture exposure.

Is PSoC Designer™ still supported for CY8C20234 development?

Yes. Infineon continues to host PSoC Designer v5.4 as a legacy IDE with full device support, including code generation, CapSense tuning GUI, and ISSP programming. While no new features are added, the tool remains fully functional for production firmware development and field updates - and is freely downloadable from Infineon's official developer portal.