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Infineon Technologies CY8C20424-12LQXI
- Part No.:
- CY8C20424-12LQXI
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C20424-12LQXI.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
CY8C20424-12LQXI from Infineon Technologies (formerly Cypress) is a programmable CapSense® PSoC System-on-Chip integrating an 8-bit M8C CPU core, 8 KB flash, 512 bytes SRAM, and dedicated capacitive sensing hardware. It operates from 2.4 V to 5.25 V, supports up to 25 buttons + 1 slider + 10 cm proximity sensing, and delivers 1.5 mA active / 2.8 µA sleep current - enabling low-power touch interfaces in consumer electronics.
For engineers reviewing the CY8C20424-12LQXI datasheet, CY8C20424-12LQXI pinout, CY8C20424-12LQXI application, or CY8C20424-12LQXI equivalent, key selection criteria include its integrated CapSense analog block, 28 GPIOs with configurable drive modes (CMOS/open-drain/pull-up/high-Z), internal 6/12 MHz IMO and 32 kHz ILO, LDO regulator (3.0 V out), and support for ISSP field reprogramming without external crystals or regulators.
Technical Context
The CY8C20424-12LQXI implements a dedicated hardware-based CapSense engine using relaxation oscillator (RO) and IDAC-based charge-transfer measurement, enabling autonomous scanning of up to 28 capacitive inputs without CPU intervention. Its analog mux bus connects all GPIOs to the CapSense comparator and reference buffer, supporting simultaneous button, slider, and proximity sensing.
It features a Harvard-architecture M8C core running at up to 12 MHz (2 MIPS), paired with system resources including I²C slave (up to 400 kHz), SPI master/slave (up to 3 MHz), watchdog/sleep timers, POR/LVD, and an internal 1.8 V analog reference - all managed via register-level control without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M8C 8-bit Harvard CPU, 2 MIPS @ 12 MHz - enables real-time sensor polling and UI response within tight timing budgets. |
| Flash Memory | 8 KB flash with 50,000 erase/write cycles - supports bootloader-based field updates and partial firmware patches. |
| SRAM | 512 bytes - sufficient for CapSense baseline tracking, debounce state, and small application variables. |
| CapSense Inputs | Up to 25 buttons + 1 slider + proximity on up to 28 GPIOs - eliminates need for external touch controller ICs. |
| Operating Voltage | 2.4 V to 5.25 V - compatible with single-cell Li-ion, 3.3 V, and 5 V systems without level-shifting. |
| Power Consumption | 1.5 mA active (3.0 V, 12 MHz); 2.8 µA sleep (3.3 V) - enables battery-powered devices with multi-month standby life. |
| Oscillators | Internal 6/12 MHz IMO + 32 kHz ILO - removes crystal, load capacitors, and external clock source. |
| LDO Regulator | Integrated 3.0 V fixed-output LDO (5 V max input) - powers I/Os independently; bypassable via register control. |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2.4–5.25 V; feeds internal LDO and digital/analog blocks. |
| VSS | GND reference | Digital and analog ground common point; requires low-impedance PCB connection. |
| P0[0]–P0[7] | GPIO / CapSense input | Configurable as button/slider electrode, LED driver, or general-purpose I/O with CMOS/open-drain modes. |
| P1[0]–P1[7] | GPIO / CapSense input | Same functionality as P0; supports full CapSense scan matrix across both ports. |
| P2[0]–P2[7] | GPIO only | No CapSense capability; used for LEDs, status outputs, or communication signals (I²C/SPI). |
| SCL / SDA | I²C interface | Dedicated pins for 400 kHz slave operation; support pull-up configuration via internal resistors. |
| SSN / MOSI / MISO / SCLK | SPI interface | Configurable as master or slave; supports 3- or 4-wire mode up to 3 MHz. |
| RESET | Active-low reset | Asynchronous reset input; internally pulled up; accepts standard open-drain or push-pull assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-accelerated CapSense | Dedicated RO-based sensing engine scans up to 28 inputs autonomously - reduces CPU load and guarantees consistent 1 kHz nominal scan rate. |
| Configurable GPIO drive modes | All 28 GPIOs support CMOS, open-drain, pull-up, and high-Z - enables direct LED driving, I²C bus termination, and noise-immune touch electrode biasing. |
| Zero-external-component timing | Internal 6/12 MHz IMO and 32 kHz ILO eliminate crystals, resonators, and load capacitors - cuts BOM cost and board space. |
| Integrated 3.0 V LDO | On-chip regulator supplies stable I/O voltage from 5 V input; bypass mode allows direct VDD routing for higher efficiency. |
| In-system serial programming (ISSP) | Single-pin programming interface supports field firmware updates without removing device from PCB. |
Applications
| Consumer Notebook Touch Keys | Smart Appliance Control Panel |
|---|---|
Use Scenario: Multimedia function keys and volume slider on ultrabook lid. IC Role / Device Role / Timing Role: Primary CapSense controller managing 4 buttons + 1 slider with LED feedback and proximity wake-up. Use Value: Enables 5 mm acrylic overlay penetration and EMI-immune operation in noisy laptop environments without shielded cables or external controllers. | Use Scenario: Wash cycle selector and temperature dial on front-loading washing machine. IC Role / Device Role / Timing Role: Standalone touch interface processor handling waterproofed electrodes, LED indicators, and I²C communication to main MCU. Use Value: Eliminates mechanical switches and reduces assembly steps; supports IPX4-rated sealed front panels with no exposed contacts. |
| Industrial HMI Keypad | Medical Device Touch Interface |
Use Scenario: Operator control panel for HVAC control system with backlighting and tactile feedback simulation. IC Role / Device Role / Timing Role: Dedicated touch subsystem managing 12-button grid and RGB LED status indicators via PWM fading/strobing. Use Value: Delivers consistent response across -40°C to +85°C operating range using internal temperature-compensated CapSense algorithms. | Use Scenario: Patient monitor front panel with sterile-glove-compatible touch controls and proximity-enabled power-on. IC Role / Device Role / Timing Role: Safety-isolated touch controller interfacing to main system via opto-isolated I²C link. Use Value: Meets IEC 60601-1 creepage/clearance requirements via internal LDO separation and GPIO drive mode configurability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT42QT2120-MAHR | 12-channel standalone QTouch IC; no MCU, no flash, no GPIO flexibility; fixed 3.3 V operation. | Requires separate microcontroller for UI logic; limited to basic button-only designs without sliders or proximity. | Select when only simple, certified button sensing is needed and firmware development overhead must be minimized. |
| STM32F070CBT6 | ARM Cortex-M0 MCU with 128 KB flash, no dedicated CapSense hardware; relies on software-based CSD or external ADC. | Higher BOM cost (requires external RC network or dedicated CapSense IC); longer development time for robust touch tuning. | Select when system already uses STM32 ecosystem and requires mixed-signal processing beyond touch (e.g., motor control + UI). |
Compared with AT42QT2120-MAHR and STM32F070CBT6, CY8C20424-12LQXI uniquely integrates production-ready CapSense hardware, 8 KB flash for local UI logic, and zero-external-component timing - delivering faster time-to-market for mid-complexity touch interfaces without compromising on scan speed or environmental robustness.
Availability
CY8C20424-12LQXI is available at Aetrix Electronics and suitable for consumer electronics, industrial HMI, and medical device touch interfaces requiring stable component supply, long-term lifecycle support, and qualified automotive-grade alternatives.
Supply support for CY8C20424-12LQXI 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive MCUs, and secure connectivity solutions.
CY8C20424-12LQXI belongs to the legacy CapSense PSoC 1 family - designed specifically for cost-sensitive, low-power capacitive touch applications where integration, reliability, and rapid prototyping outweigh raw processing performance.
FAQ
What is the maximum number of capacitive buttons supported by CY8C20424-12LQXI?
The CY8C20424-12LQXI supports up to 25 independent capacitive buttons, plus one linear slider and proximity sensing on up to 28 GPIO pins. This capacity is achieved using its dedicated hardware-based relaxation oscillator and IDAC-driven charge-transfer measurement engine - no firmware overhead or CPU polling required for baseline scanning.
Does CY8C20424-12LQXI require an external crystal or oscillator?
No. The device includes an internal 6/12 MHz main oscillator (IMO) and a 32 kHz low-speed oscillator (ILO), both factory-trimmed and temperature-compensated. These eliminate the need for external crystals, resonators, or load capacitors - reducing BOM count and PCB area while maintaining ±5% frequency accuracy over voltage and temperature.
Can CY8C20424-12LQXI drive LEDs directly?
Yes. All 28 GPIOs support configurable drive modes including CMOS push-pull, open-drain, pull-up, and high-impedance. Each pin can source or sink up to 25 mA, enabling direct driving of standard LEDs with programmable fading, strobing, and RGB color mixing - no external drivers or current-limiting resistors required for typical indicator applications.
Is there a development toolchain available for CY8C20424-12LQXI?
Yes. PSoC Designer™ - a free, Windows-based IDE - provides drag-and-drop user module configuration, automatic API generation, C/assembly editing, and full-speed in-circuit emulation with 128 KB trace memory. It supports ISSP programming and includes pre-characterized CapSense, I²C, SPI, and LED modules - enabling functional prototype validation within hours.
CY8C20424-12LQXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- PSOC™1 CY8C20xxx
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- M8C
- Core Size:
- 8-Bit
- Speed:
- 12MHz
- Connectivity:
- I2C, SPI
- Peripherals:
- LVD, POR, WDT
- Number of I/O:
- 28
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.4V ~ 5.25V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C20424-12LQXI FAQ
1.How can I place an order for CY8C20424-12LQXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20424-12LQXI 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 CY8C20424-12LQXI reliable?
The price and inventory of CY8C20424-12LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20424-12LQXI is usually 5 days.
3.What payment methods are accepted for CY8C20424-12LQXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20424-12LQXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20424-12LQXI?
CY8C20424-12LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20424-12LQXI 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 CY8C20424-12LQXI?
For technical support, including CY8C20424-12LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20424-12LQXI requirements.
6.How does Aetrix verify that CY8C20424-12LQXI is sourced from the original manufacturer or authorized distributors?
All CY8C20424-12LQXI 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 CY8C20424-12LQXI meets industry standards.
7.What is the process for return or replacement of CY8C20424-12LQXI?
All CY8C20424-12LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20424-12LQXI, 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 CY8C20424-12LQXI part is unused and in its original packaging.
Return procedure for CY8C20424-12LQXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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