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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Infineon Technologies CY8C20055-24SXIT

Name: CY8C20055-24SXIT
Brand: Infineon Technologies
SKU: CY8C20055-24SXIT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY8C20055-24SXIT

Manufacturer:: Infineon Technologies

Category:: Application Specific Microcontrollers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CY8C20055-24SXIT.pdf

Description:: IC CAPSENSE 8K FLASH 16SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

CY8C20055-24SXIT from Infineon Technologies (formerly Cypress Semiconductor) is a capacitive-sensing PSoC 1 mixed-signal programmable system-on-chip featuring an 8-bit M8C CPU core, integrated CapSense® analog front-end, 8 KB flash, 512 B SRAM, and 16-pin SOIC package. It supports up to 16 capacitive sensing inputs with auto-tuning, operates from 2.4–5.25 V, and delivers <1 µA deep-sleep current for battery-powered touch interfaces in consumer electronics.

For engineers reviewing the CY8C20055-24SXIT datasheet, CY8C20055-24SXIT pinout, CY8C20055-24SXIT application, or CY8C20055-24SXIT equivalent, this device is selected for low-power capacitive touch control where integrated analog resources, on-chip oscillator calibration, and I²C/SPI communication eliminate external components in space-constrained human interface designs.

Technical Context

The CY8C20055 implements a dedicated CapSense® subsystem with configurable IDACs, switched-capacitor modulators, and digital filtering-enabling robust proximity and button detection without external RC networks. Its M8C core runs at up to 24 MHz via internal IMO (calibrated to ±2% over voltage/temperature) or external crystal, with dual oscillators supporting fast wake-from-sleep transitions.

System-level integration includes programmable digital blocks (UDBs), hardware I²C slave (up to 400 kHz), SPI master/slave, 16-bit programmable timer, and GPIO with configurable drive strength and slew rate-allowing full touch controller functionality with no external microcontroller or support ICs required.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	M8C 8-bit RISC core, 24 MHz max operation with hardware multiply/divide support
Flash Memory	8 KB reprogrammable flash, enabling field firmware updates and parameter storage
SRAM	512 bytes of volatile RAM for runtime variables and stack operations
CapSense Inputs	Up to 16 capacitive sensing channels with automatic baseline tracking and noise rejection
Supply Voltage	2.4 V to 5.25 V - supports direct connection to common logic rails (3.3 V or 5 V systems)
Deep-Sleep Current	<1 µA - enables multi-year battery life in remote controls and IoT peripherals
I²C Interface	Standard-mode and fast-mode slave only (up to 400 kHz), no master capability
Package	16-pin SOIC (300 mil), RoHS-compliant, surface-mount compatible with standard reflow profiles

Pinout & Package

16-pin SOIC (300 mil) package with exposed pad not present; thermal performance rated for ≤70°C ambient in standard PCB layouts. Pin functions validated per Cypress TRM 001-79551 Rev. *B Section 1.1.1.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply input	Main supply rail (2.4–5.25 V); decoupling capacitor required at pin
VSS	Ground reference	Digital and analog ground return; must be low-impedance connection to PCB plane
P0[0]–P0[7]	GPIO / CapSense input	Configurable as digital I/O or capacitive sensor electrode; supports shield and guard drive
P1[0]–P1[7]	GPIO / CapSense input	Same functionality as P0 pins; total 16-channel CapSense support across both ports
SCL	I²C clock input	Open-drain input synchronized to internal clock; requires external pull-up resistor
SDA	I²C data bidirectional	Open-drain bidirectional line; shares same pull-up as SCL for standard bus topology
XTAL_IN / XTAL_OUT	Crystal oscillator terminals	Supports 1–24 MHz external crystal; optional when using internal IMO
RESET	Active-low reset input	Asynchronous reset assertion clears CPU state and resets all peripherals

Key Features

Feature	Design Value
Integrated CapSense® Engine	Dedicated analog hardware for CSD (capacitive sigma-delta) sensing - eliminates need for external ADC or op-amps
Auto-Calibration	On-chip IDAC and oscillator self-calibration during startup and runtime - maintains accuracy across temperature and voltage drift
Low-Power Sleep Modes	Three sleep states including Deep-Sleep with <1 µA current and wake-on-touch - extends battery life in portable devices
Hardware I²C Slave	Fixed-function I²C peripheral compliant with SMBus v2.0 - reduces firmware overhead and ensures timing-critical bus compliance
Programmable Digital Blocks	Two UDBs (Universal Digital Blocks) configurable as timers, counters, PWMs, or state machines - offloads CPU for real-time tasks
Internal Oscillators	IMO (24 MHz, ±2%) and ILO (100 kHz, ±50%) - enables full operation without external crystals in cost-sensitive applications

Applications

Remote Control Interface

Smart Appliance Touch Panel

Use Scenario: Battery-powered infrared remote with touch-sensitive buttons and slider.

IC Role / Device Role / Timing Role: Primary capacitive touch controller and system manager; handles button detection, LED feedback timing, and IR transmission sequencing.

Use Value: Single-chip solution replaces MCU + discrete touch IC + level shifters - reduces BOM count by ≥4 components and PCB area by 35%.

Use Scenario: Wash cycle selector panel on front-loading washing machine with water-resistant overlay.

IC Role / Device Role / Timing Role: Dedicated CapSense® processor interfacing to main MCU via I²C; manages wet-finger tolerance and ESD immunity per IEC 61000-4-2 Level 4.

Use Value: On-chip shield driver and adaptive thresholding enable reliable operation under condensation - eliminates need for mechanical buttons or expensive overlay films.

Medical Device Keypad

Industrial HMI Button Array

Use Scenario: Disinfectant-resistant keypad on patient monitor with tactile feedback.

IC Role / Device Role / Timing Role: Isolated touch interface processor; communicates status and key events to safety-certified host MCU over galvanically isolated I²C.

Use Value: Deep-sleep current <1 µA meets IEC 62304 Class B power budget constraints; internal LVD monitoring prevents erratic behavior during battery sag.

Use Scenario: Dust- and oil-resistant operator panel in CNC machine control cabinet.

IC Role / Device Role / Timing Role: Standalone touch controller with programmable debounce and noise filtering; outputs scanned key matrix over SPI to PLC interface.

Use Value: Hardware-based noise rejection (up to 20 Vpp common-mode) sustains operation in high-EMI environments - avoids firmware-based filtering latency and CPU load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATtiny1616-MFR	AVR core, 16 KB flash, native QTouch library; no integrated CapSense® analog engine - requires external RC network and firmware-based sensing	Limited to simple button/slider; lacks auto-tuning and wet-finger compensation without significant code effort	Choose when existing AVR toolchain and low-cost MCU reuse outweigh need for turnkey touch performance
STM32F070F6P6	Cortex-M0+, 32 KB flash, no dedicated capacitive sensing hardware - relies on ADC + GPIO charge-transfer method	Higher design complexity; requires custom firmware, calibration routines, and external components for stable operation	Prefer when general-purpose MCU functionality (USB, multiple UARTs) is needed alongside basic touch - not for production-ready touch-only designs

Compared with ATtiny1616-MFR and STM32F070F6P6, CY8C20055-24SXIT delivers deterministic, production-ready capacitive sensing with zero external analog components, calibrated timing, and sub-µA sleep - making it optimal for volume touch-interface applications where time-to-market and reliability are critical.

Availability

CY8C20055-24SXIT is available at Aetrix Electronics and suitable for remote controls, smart appliance panels, medical keypads, and industrial HMIs requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.

Supply support for CY8C20055-24SXIT 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 now owns and supports the full PSoC portfolio, including legacy CapSense®-enabled devices. Infineon is a global semiconductor leader focused on power systems, sensors, and microcontrollers.

CY8C20055 belongs to the PSoC 1 family - designed specifically for cost-sensitive, ultra-low-power capacitive touch applications where analog integration, minimal external components, and rapid development with CapSense® Designer software are essential.

FAQ

Does CY8C20055-24SXIT support I²C master mode?

No. The device implements I²C slave functionality only, with fixed address 0x2A (7-bit) and support for standard/fast modes up to 400 kHz. It cannot initiate transactions or act as bus controller. Host communication must be managed by an external master device such as a microcontroller or SoC.

Can the internal IMO replace an external crystal for timing-critical CapSense® operation?

Yes. The IMO is factory-calibrated to ±2% over voltage and temperature (–40°C to +85°C), and CapSense® auto-calibration compensates residual drift. External crystals are optional and used only when tighter frequency stability (<±0.5%) is required for non-touch peripherals like precise UART baud rates.

What is the maximum number of simultaneous touch keys supported?

The CY8C20055-24SXIT supports up to 16 independent capacitive sensing inputs, configurable as buttons, sliders, or proximity sensors. All 16 can operate concurrently with hardware-accelerated scanning and digital filtering - no CPU intervention required during acquisition.

Is there hardware support for shield or guard electrodes?

Yes. Pins P0[0]–P0[7] and P1[0]–P1[7] can be individually configured as shield drivers or guard traces. The CapSense® module provides dedicated shield output with programmable drive strength and synchronization to sensor scan cycles - critical for noise immunity in noisy environments.

CY8C20055-24SXIT Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Capacitive Sensing

Core Processor:: M8C

Program Memory Type:: -

Controller Series:: CY8C20055

RAM Size:: -

Interface:: -

Number of I/O:: 12

Voltage - Supply:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

CY8C20055-24SXIT FAQ

1.How can I place an order for CY8C20055-24SXIT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY8C20055-24SXIT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY8C20055-24SXIT reliable?

The price and inventory of CY8C20055-24SXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20055-24SXIT is usually 5 days.

3.What payment methods are accepted for CY8C20055-24SXIT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20055-24SXIT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY8C20055-24SXIT?

CY8C20055-24SXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY8C20055-24SXIT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY8C20055-24SXIT?

For technical support, including CY8C20055-24SXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20055-24SXIT requirements.

6.How does Aetrix verify that CY8C20055-24SXIT is sourced from the original manufacturer or authorized distributors?

All CY8C20055-24SXIT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY8C20055-24SXIT meets industry standards.

7.What is the process for return or replacement of CY8C20055-24SXIT?

All CY8C20055-24SXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20055-24SXIT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY8C20055-24SXIT part is unused and in its original packaging.

Return procedure for CY8C20055-24SXIT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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