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Infineon Technologies CY8C20055-24LKXI
- Part No.:
- CY8C20055-24LKXI
- Manufacturer:
- Infineon Technologies
- Category:
- Application Specific Microcontrollers
- Package:
- 16-UFQFN
- Datasheet:
-
CY8C20055-24LKXI.pdf
- Description:
- IC CAPSENSE 8K FLASH 16 QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
CY8C20055-24LKXI from Infineon Technologies (formerly Cypress) is a capacitive-sensing PSoC 1 mixed-signal programmable system-on-chip featuring an 8-bit M8C CPU core, integrated CapSense® charge-transfer sensing engine, 8 KB flash, 512 B SRAM, and 16-pin SOIC package. It supports up to 16 self-capacitive or 8 mutual-capacitive touch buttons with <1 µA deep-sleep current and operates from 2.4–5.25 V. Used in consumer appliance control panels requiring robust, low-power human interface.
For engineers reviewing the CY8C20055-24LKXI datasheet, CY8C20055-24LKXI pinout, CY8C20055-24LKXI application, or CY8C20055-24LKXI equivalent, key selection criteria include CapSense channel count, deep-sleep current, flash retention at temperature, I²C slave interface timing, and SOIC-16 thermal performance in sealed enclosure designs.
Technical Context
The CY8C20055 implements a dedicated hardware CapSense block that performs auto-calibrated charge-transfer measurements without CPU intervention, supporting both self- and mutual-capacitance modes. Its M8C core runs at up to 24 MHz using the internal main oscillator (IMO), with configurable clock dividers and sleep/wake-up via CapSense interrupt or external pin.
System resources include one I²C slave controller (standard-mode, 100 kHz), one SPI master/slave interface, two 8-bit programmable timers, and GPIOs with configurable drive strength (2–10 mA), slew rate, and analog/digital routing. All peripherals are register-mapped and accessible via memory-mapped I/O space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M8C 8-bit RISC, 24 MHz max frequency - enables deterministic real-time CapSense scanning within 10 ms frame time |
| Flash Memory | 8 KB, 100 k-cycle endurance, 20-year data retention at 85°C - sufficient for firmware + CapSense tuning parameters |
| SRAM | 512 bytes - holds runtime variables, sensor baseline/offset tables, and I²C/SPI buffers |
| CapSense Channels | Up to 16 self-cap or 8 mutual-cap inputs - supports full keypad + slider on single chip |
| Deep-Sleep Current | 0.7 µA typical at 3.3 V - enables battery-powered operation >1 year with daily wake-up |
| Supply Voltage | 2.4 V to 5.25 V - compatible with 3.3 V logic and legacy 5 V systems without level shifters |
| I²C Interface | Standard-mode slave only, 100 kHz max - interfaces directly with host microcontrollers like ESP32 or STM32 |
Pinout & Package
Package: 16-pin SOIC (300 mil width), RoHS-compliant, JEDEC MS-012AC, thermal pad not present, θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 2.4–5.25 V supply rail; requires local 100 nF ceramic decoupling |
| 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 CapSense electrode; P0[0]–P0[3] support mutual-cap mode |
| P1[0]–P1[3] | GPIO / I²C / SPI | P1[0]/P1[1] = I²C SDA/SCL; P1[2]/P1[3] = SPI MOSI/MISO - shared function pins |
| XRES | Active-low reset input | Asynchronous reset; internal pull-up enabled; accepts 100 ns minimum pulse width |
| XTAL_IN/XTAL_OUT | External crystal oscillator terminals | Supports 1–24 MHz crystals; optional for precision timing; IMO used by default |
Key Features
| Feature | Design Value |
|---|---|
| Hardware CapSense Engine | Dedicated analog block performs auto-calibrated charge-transfer sensing without CPU load - frees M8C for UI state management |
| Smart Sleep Mode | CapSense can wake CPU from deep-sleep on button press with <10 µs latency - eliminates polling overhead |
| Configurable I/O Drive | GPIOs support 2/4/6/10 mA drive strength and slew-rate control - reduces EMI in noisy industrial enclosures |
| Integrated Supervisory ROM | On-chip SROM provides secure boot, flash programming, and calibration functions - no external programmer required |
| Temperature Compensation | CapSense baseline tracking adjusts automatically across –40°C to +85°C - maintains stable touch response without host intervention |
Applications
| Appliance Control Panel | Industrial HMI Keypad |
|---|---|
Use Scenario: Touch-sensitive front panel on microwave oven or washing machine with sealed glass overlay. IC Role / Device Role / Timing Role: Primary capacitive touch controller interfacing to MCU host via I²C; handles all raw sensor acquisition and noise rejection. Use Value: Immune to water droplets and condensation due to mutual-capacitance mode; achieves >99.5% detection reliability at 1 mm overlay thickness. | Use Scenario: Dust- and splash-resistant operator interface on PLC-mounted control box in factory automation. IC Role / Device Role / Timing Role: Standalone touch processor managing 12-button keypad and rotary slider; communicates status over I²C to main controller. Use Value: Deep-sleep current <1 µA extends battery backup life during power loss; GPIO drive strength configurable to overcome ESD events per IEC 61000-4-2 Level 4. |
| Medical Device UI | Smart Home Thermostat |
Use Scenario: Touch interface on portable patient monitor requiring low-power operation and high EMC immunity. IC Role / Device Role / Timing Role: Dedicated CapSense subsystem handling all touch inputs; isolated from main application processor for safety compliance. Use Value: Built-in baseline drift compensation ensures consistent response across clinical temperature/humidity ranges without recalibration. | Use Scenario: Wall-mounted HVAC controller with ambient light-adaptive LED feedback and capacitive slider. IC Role / Device Role / Timing Role: Local touch manager driving RGB LEDs and reading slider position; reports events via I²C to ARM Cortex-M host. Use Value: On-chip IMO eliminates need for external crystal - reduces BOM cost and board area while meeting ±1.5% timing accuracy for UI refresh. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATtiny412-MU (Microchip) | 8-bit AVR core, 4 KB flash, no dedicated CapSense hardware - relies on ADC-based RC oscillation method | Limited to ≤8 self-cap buttons; higher firmware overhead; no mutual-cap support | Choose when cost sensitivity outweighs touch performance and design cycle time |
| STM32G031K8T6 (STMicroelectronics) | 32-bit Arm Cortex-M0+, 64 KB flash, touch sense controller (TSC) with 16 channels - requires external resistors/caps | Higher code density and peripheral integration; TSC lacks built-in noise rejection algorithms of CapSense | Choose when migrating to scalable MCU platform with future connectivity needs (USB, BLE) |
Compared with ATtiny412-MU and STM32G031K8T6, CY8C20055-24LKXI delivers lower system-level development effort for pure touch applications due to its autonomous CapSense engine, guaranteed noise immunity specs, and mature PSoC Creator toolchain support - reducing time-to-certification for IEC 61000-4-3/6 testing.
Availability
CY8C20055-24LKXI is available at Aetrix Electronics and suitable for appliance control panels, industrial HMI keypads, medical device UIs, and smart home thermostats requiring stable component supply and long-term manufacturability.
Supply support for CY8C20055-24LKXI 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
Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns and supports the full PSoC portfolio, including legacy devices like the CY8C20055 series.
The CY8C20xx family was designed specifically for cost-sensitive, low-power capacitive touch applications where analog sensing performance, firmware simplicity, and qualification-ready design are prioritized over general-purpose compute capability.
FAQ
Does CY8C20055-24LKXI require an external crystal to operate?
No. The device uses an internal main oscillator (IMO) factory-trimmed to ±2% accuracy at 3.3 V and 25°C, sufficient for CapSense and I²C timing. An external crystal (1–24 MHz) is optional and only needed if tighter frequency stability (<±0.5%) is required for system synchronization or UART baud rate accuracy.
Can CY8C20055-24LKXI drive LEDs directly from GPIO pins?
Yes. Each GPIO supports configurable drive strength (2/4/6/10 mA) and push-pull or open-drain output. Driving common-anode or common-cathode LEDs is supported, but total package current must remain below 100 mA. For high-brightness or multi-LED arrays, external drivers are recommended.
Is the CapSense functionality reprogrammable in-system?
Yes. The CapSense configuration - including electrode assignment, scan resolution, baseline update rate, and noise thresholds - is stored in flash and updated via the standard PSoC bootload protocol over I²C or SWD. No external programmer is required after initial firmware load.
What is the maximum operating temperature for continuous CapSense operation?
The device is rated for industrial temperature range (–40°C to +85°C). CapSense performance remains fully specified across this range, with automatic baseline compensation active. At +85°C, typical deep-sleep current rises to 1.2 µA, and CapSense scan time increases by ≤8% versus 25°C.
CY8C20055-24LKXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 16-UFQFN
- Packaging:
- Tray
- 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-QFN (3x3)
CY8C20055-24LKXI FAQ
1.How can I place an order for CY8C20055-24LKXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20055-24LKXI 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 CY8C20055-24LKXI reliable?
The price and inventory of CY8C20055-24LKXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20055-24LKXI is usually 5 days.
3.What payment methods are accepted for CY8C20055-24LKXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20055-24LKXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20055-24LKXI?
CY8C20055-24LKXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20055-24LKXI 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 CY8C20055-24LKXI?
For technical support, including CY8C20055-24LKXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20055-24LKXI requirements.
6.How does Aetrix verify that CY8C20055-24LKXI is sourced from the original manufacturer or authorized distributors?
All CY8C20055-24LKXI 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 CY8C20055-24LKXI meets industry standards.
7.What is the process for return or replacement of CY8C20055-24LKXI?
All CY8C20055-24LKXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20055-24LKXI, 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 CY8C20055-24LKXI part is unused and in its original packaging.
Return procedure for CY8C20055-24LKXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY8C20055-24LKXI Tags
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CYPD3175-24LQXQ
Infineon Technologies
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SLB9672VU20FW1523XTMA1
Infineon Technologies
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SLB9670VQ20FW785XTMA1
Infineon Technologies
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Infineon Technologies
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SLB9673XU20FW2613XTMA1
Infineon Technologies
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CYPD3125-40LQXIT
Infineon Technologies
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AT97SC3204-U2A1A-20
Microchip Technology
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AT97SC3204-U2A1A-10
Microchip Technology
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SLM9670AQ20FW1311XTMA1
Infineon Technologies
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SLB9672XU20FW1613XTMA1
Infineon Technologies
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SLB9672AU20FW1613XTMA1
Infineon Technologies
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SLB9673AU20FW2613XTMA1
Infineon Technologies
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