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Infineon Technologies CY8C20434-12LQXIT
- Part No.:
- CY8C20434-12LQXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C20434-12LQXIT.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
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Product details
Overview
CY8C20434-12LQXIT from Infineon Technologies (formerly Cypress) is a programmable 8-bit PSoC® System-on-Chip with integrated CapSense® capacitive sensing engine, M8C CPU core running up to 12 MHz, 8 KB flash, 512 bytes SRAM, and 28 GPIOs supporting configurable analog inputs and 20-mA sink per pin - deployed in human interface applications such as touch-enabled industrial control panels and consumer appliance interfaces.
For engineers reviewing the CY8C20434-12LQXIT datasheet, CY8C20434-12LQXIT pinout, CY8C20434-12LQXIT application, or CY8C20434-12LQXIT equivalent, key selection criteria include its dedicated hardware-accelerated CapSense block, I²C/SPI communication support at up to 400 kHz / 3 MHz, internal ±5% 6/12-MHz oscillator, 2.4–5.25 V operating range, and industrial temperature rating (–40 °C to +85 °C).
Technical Context
The device implements a Harvard-architecture M8C CPU core with on-chip 8 KB flash and 512-byte SRAM, enabling firmware execution and data storage without external memory. Its CapSense block operates independently using relaxation oscillator-based charge-transfer measurement, supporting up to 28 self- or mutual-capacitance sensing channels with hardware scanning and noise-immune comparator circuitry.
System resources include an I²C slave (50/100/400 kHz), SPI master/slave (46.9 kHz–3 MHz), 32-kHz low-speed oscillator for sleep/wake timing, internal 1.8-V analog reference, and a 3.0-V LDO regulator for port 1 digital I/O - all managed via register-level configuration without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M8C 8-bit Harvard architecture, 12 MHz max clock - enables deterministic real-time sensor polling and low-latency UI response. |
| Flash Memory | 8 KB with 50,000 erase/write cycles - supports field firmware updates and partial reprogramming of CapSense tuning parameters. |
| SRAM | 512 bytes - sufficient for runtime variables, sensor baseline tracking, and small state-machine buffers. |
| CapSense Inputs | Up to 28 GPIO-configurable channels - allows full-button/slider/touchpad implementation on single chip without external RC networks. |
| I/O Drive | 20 mA sink per GPIO, 5 mA strong drive on Port 1 - directly drives LEDs or small indicators without external drivers. |
| Operating Voltage | 2.4 V to 5.25 V - compatible with both 3.3-V and 5-V system rails, simplifying power domain integration. |
| Temperature Range | –40 °C to +85 °C - qualified for industrial HMI and white-goods control environments. |
Pinout & Package
Package: 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), exposed thermal pad - optimized for compact touch-control modules with low thermal resistance and high board-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Accepts 2.4–5.25 V; powers digital core, CapSense block, and internal LDO. |
| VSS | Ground reference | Common return for all analog/digital circuits; must be low-impedance for CapSense noise immunity. |
| P0[0]–P0[7] | General-purpose I/O with analog mux | Configurable as CapSense electrodes, digital I/O, or analog inputs; connected to global analog bus. |
| P1[0]–P1[7] | Digital I/O with regulated 3.0-V output | Supports 5 mA strong drive mode; LDO-regulated for stable LED driving or logic-level translation. |
| SCL / SDA | I²C interface pins | Open-drain, 50/100/400 kHz selectable - enable host MCU or microcontroller communication for configuration and reporting. |
| SPIMISO / SPIMOSI / SPICLK / SPISSEL | SPI interface terminals | Full-duplex master/slave operation; clock rate scalable from 46.9 kHz to 3 MHz based on IMO frequency. |
| XTAL_IN / XTAL_OUT | External crystal oscillator inputs | Optional 32.768 kHz crystal connection for precise sleep timer or RTC functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-accelerated CapSense block | Dedicated relaxation oscillator and counter-based sensing engine eliminates CPU overhead during scan cycles. |
| Configurable analog multiplexer | Connects any GPIO to internal analog bus - enables flexible slider/touchpad layouts and dynamic electrode reassignment. |
| Internal 1.8-V analog reference | Stable voltage reference independent of VDD - ensures consistent capacitance measurement across supply variations. |
| Programmable I/O drive modes | Pull-up, high-Z, open-drain, CMOS - supports direct interfacing with mechanical switches, LEDs, and legacy sensors. |
| In-system serial programming (ISSP) | Enables firmware updates via two-wire interface - supports field calibration and CapSense parameter tuning without rework. |
Applications
| Home Appliance Control Panel | Industrial HMI Keypad |
|---|---|
|
Use Scenario: Touch-sensitive front panel on washing machine or oven with waterproof overlay and ESD immunity requirements. IC Role / Device Role / Timing Role: Primary capacitive sensing controller executing real-time button/slider scans and debouncing in <10 ms intervals. Use Value: Eliminates mechanical switches and associated wear/failure; supports glass-over-metal construction with >15 kV ESD robustness via hardware filtering. |
Use Scenario: Operator interface on PLC-mounted control box in factory automation environment with dust, vibration, and wide temperature swings. IC Role / Device Role / Timing Role: Standalone HMI processor handling tactile feedback, LED status indication, and I²C communication to main controller. Use Value: 20-mA GPIO sink capability drives indicator LEDs directly; –40 °C to +85 °C rating ensures reliability without external thermal management. |
| Medical Device Touch Interface | Smart Thermostat Front Panel |
|
Use Scenario: Sanitary, glove-compatible touch surface on infusion pump or diagnostic monitor requiring low-power sleep and rapid wake responsiveness. IC Role / Device Role / Timing Role: Low-power CapSense coordinator using 32-kHz ILO for periodic wake-up and sub-100 µA deep-sleep current. Use Value: Internal LDO and regulated Port 1 enable consistent LED brightness across battery discharge; no external regulators needed. |
Use Scenario: Wall-mounted HVAC controller with ambient light-adaptive backlight and proximity wake-up capability. IC Role / Device Role / Timing Role: Dual-role controller managing capacitive buttons, ambient light sensing (via ADC), and I²C display driver interface. Use Value: Shared analog mux allows reuse of same GPIOs for CapSense and light-sensing functions - reduces BOM count and PCB layer count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive sensing controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MTCH101-I/ST | Dedicated single-chip CapTouch controller; no user-programmable CPU or flash; fixed firmware only. | Limited to basic button/slider; no custom algorithm, no I²C host control, no firmware update capability. | Select when cost and footprint are critical and sensing functionality is static and fully defined at design-in. |
| CY8C4014LQI-422 | PSoC 4 family; ARM Cortex-M0+, 16 KB flash, 2 KB SRAM, CapSense v2.0, higher performance and memory. | Supports complex UI stacks, BLE connectivity, and advanced gesture processing - requires more development effort. | Select when future scalability, wireless integration, or multi-sensor fusion is anticipated in product roadmap. |
Compared with MTCH101-I/ST, CY8C20434-12LQXIT offers firmware programmability and mixed-signal flexibility; compared with CY8C4014LQI-422, it delivers lower power and simpler toolchain for cost-sensitive, fixed-function touch interfaces.
Availability
CY8C20434-12LQXIT is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI keypads, medical device touch interfaces, and smart thermostat front panels requiring stable component supply and long-term production continuity.
Supply support for CY8C20434-12LQXIT 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, delivering power systems, microcontrollers, and sensing solutions for industrial, automotive, and IoT applications.
CY8C20434-12LQXIT belongs to the legacy PSoC® 1 CapSense® controller product line, designed specifically for cost-optimized, low-power capacitive touch interfaces where programmability and analog integration reduce system component count.
FAQ
Does CY8C20434-12LQXIT require external crystals for basic CapSense operation?
No. The device includes an internal ±5% 6/12-MHz main oscillator (IMO) and 32-kHz low-frequency oscillator (ILO) sufficient for all CapSense scanning, I²C communication, and sleep/wake timing. An external 32.768-kHz crystal is optional and only needed for high-precision real-time clock applications.
Can CY8C20434-12LQXIT drive LEDs directly without current-limiting resistors?
Yes - Port 1 supports 5 mA strong-drive mode with internal current regulation. However, external resistors are still recommended for precise brightness control and thermal margining, especially when driving multiple LEDs simultaneously within the 20 mA total port limit.
What development tools are required to configure and program CY8C20434-12LQXIT?
PSoC Designer™ (free Windows IDE) is the official toolset. It provides drag-and-drop CapSense configuration, automatic code generation, ISSP programming, and real-time tuning via USB-to-I²C bridge (e.g., CY3280-20x34 kit). No JTAG debugger is required - full-speed emulation and 128 KB trace memory are built-in.
Is the CapSense functionality certified for IEC 61000-4-6 conducted RF immunity or IEC 61000-4-2 ESD testing?
Yes - the CY8C20x34 family meets IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) and IEC 61000-4-6 (10 V/m, 150 kHz–80 MHz) when implemented per the CY8C20x34 CapSense Design Guide (AN2397) with proper layout, shielding, and overlay thickness guidelines.
CY8C20434-12LQXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- PSOC™1 CY8C20xxx
- Packaging:
- Tape & Reel (TR)
- 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:
CY8C20434-12LQXIT FAQ
1.How can I place an order for CY8C20434-12LQXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20434-12LQXIT 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 CY8C20434-12LQXIT reliable?
The price and inventory of CY8C20434-12LQXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20434-12LQXIT is usually 5 days.
3.What payment methods are accepted for CY8C20434-12LQXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20434-12LQXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20434-12LQXIT?
CY8C20434-12LQXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20434-12LQXIT 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 CY8C20434-12LQXIT?
For technical support, including CY8C20434-12LQXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20434-12LQXIT requirements.
6.How does Aetrix verify that CY8C20434-12LQXIT is sourced from the original manufacturer or authorized distributors?
All CY8C20434-12LQXIT 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 CY8C20434-12LQXIT meets industry standards.
7.What is the process for return or replacement of CY8C20434-12LQXIT?
All CY8C20434-12LQXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20434-12LQXIT, 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 CY8C20434-12LQXIT part is unused and in its original packaging.
Return procedure for CY8C20434-12LQXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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