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Infineon Technologies CY8C20434-12LQXI
- Part No.:
- CY8C20434-12LQXI
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C20434-12LQXI.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
CY8C20434-12LQXI 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 analog input, digital I/O, and configurable CapSense sensor interfaces - deployed in human-interface touch control systems for industrial HMI and consumer appliance panels.
For engineers reviewing the CY8C20434-12LQXI datasheet, CY8C20434-12LQXI pinout, CY8C20434-12LQXI application, or CY8C20434-12LQXI equivalent, key selection criteria include its dedicated hardware-based CapSense block, 2.4–5.25 V operating range, 32 kHz low-power oscillator for sleep mode, I²C slave support at 400 kHz, and LQFP-48 package compatibility with industrial temperature operation (–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. It integrates a dedicated CapSense analog block with relaxation oscillator, comparator, and counter circuitry - all operating autonomously without CPU intervention during sensor scanning.
System resources include a 6/12 MHz internal main oscillator (IMO), 32 kHz internal low-speed oscillator (ILO), programmable I²C slave (50/100/400 kHz), SPI master/slave (46.9 kHz–3 MHz), watchdog timer, power-on reset (POR), low-voltage detection (LVD), and a 3.0 V LDO regulator for Port 1 I/O supply - all managed via register-level configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M8C 8-bit Harvard architecture, 12 MHz max clock - enables deterministic real-time CapSense scanning and firmware execution with two MIPS throughput. |
| Flash Memory | 8 KB with 50,000 erase/write cycles - supports field firmware updates and partial reprogramming without full chip erase. |
| SRAM | 512 bytes - sufficient for sensor state buffers, interrupt stacks, and small application variables in touch-control firmware. |
| CapSense Inputs | Up to 28 GPIO-configurable capacitive sensing channels - allows simultaneous buttons, sliders, and proximity sensors without external components. |
| Operating Voltage | 2.4 V to 5.25 V - compatible with both 3.3 V and 5 V system rails, simplifying power design in mixed-voltage embedded applications. |
| Temperature Range | –40 °C to +85 °C industrial grade - validated for reliable operation in appliance control panels and factory HMIs. |
| I²C Speed | Configurable 50/100/400 kHz slave mode - enables high-speed host communication for touch event reporting and parameter tuning. |
Pinout & Package
Package: 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply | 2.4–5.25 V input for digital core and CapSense analog block; decoupling required per datasheet layout guidelines. |
| VSS | Digital ground | Reference return path for CPU, I/O, and digital logic; must be connected to system ground plane with low impedance. |
| P0[0]–P0[7] | General-purpose I/O | Configurable as CapSense inputs, digital outputs (20 mA sink), or analog inputs; share global analog bus for CapSense routing. |
| P1[0]–P1[7] | Regulated I/O port | Supplied by internal 3.0 V LDO (20 mA total source); supports strong-drive mode (5 mA) for LED or relay interface. |
| SCL / SDA | I²C interface | Open-drain bidirectional pins for 400 kHz slave communication; require external pull-ups to VDD or VDDIO. |
| XTAL_IN / XTAL_OUT | External crystal interface | Optional 32.768 kHz crystal connection for precise timing; not required when using internal 32 kHz ILO oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| Dedicated CapSense hardware block | Offloads touch-sensing computation from CPU - enables sub-10 ms scan time for 28 sensors while CPU remains available for application logic. |
| Configurable I/O drive modes | Per-pin selection of CMOS push-pull, open-drain, pull-up, or high-Z - supports direct LED driving, button debouncing, and noise-immune sensor routing. |
| Internal 3.0 V LDO for Port 1 | Provides stable regulated output for sensitive analog peripherals or external LEDs - eliminates need for discrete LDO in space-constrained designs. |
| Programmable clock sources | Independent 6/12 MHz IMO and 32 kHz ILO - allows dynamic clock switching to reduce active power during touch polling and enter ultra-low-power sleep states. |
| In-system serial programming (ISSP) | Enables field firmware updates via two-wire interface - supports production programming and post-deployment bug fixes without removing the IC. |
Applications
| Home Appliance Control Panel | Industrial HMI Touch Interface |
|---|---|
|
Use Scenario: Capacitive touch buttons and slider on microwave oven or washing machine front panel, operating in humid, ESD-prone environments. IC Role / Device Role / Timing Role: Primary CapSense controller executing autonomous sensor scans, filtering noise, and reporting touch events over I²C to main MCU. Use Value: Eliminates mechanical switches and reduces BOM cost; hardware-accelerated scanning ensures <15 ms response time even with 12-button + 1-slider configuration. |
Use Scenario: Operator terminal on CNC machine or PLC cabinet requiring robust touch input under vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: Standalone touch interface processor handling all capacitive sensing, debouncing, and gesture interpretation independently of host controller. Use Value: Industrial temperature rating (–40 °C to +85 °C) and EMC-hardened CapSense algorithm ensure reliable operation without recalibration across environmental shifts. |
| Smart Thermostat User Interface | Medical Device Touch Keypad |
|
Use Scenario: Wall-mounted HVAC thermostat with circular slider for temperature adjustment and capacitive buttons for mode selection. IC Role / Device Role / Timing Role: Dedicated CapSense SoC managing multi-sensor geometry, proximity wake-up, and low-power sleep between user interactions. Use Value: Internal 32 kHz ILO enables 2 µA deep-sleep current; fast wake-up (<100 µs) ensures immediate responsiveness upon finger approach. |
Use Scenario: Touch keypad on infusion pump or diagnostic monitor requiring glove-compatible operation and immunity to saline splash. IC Role / Device Role / Timing Role: Safety-critical touch controller with configurable baseline tracking and shield electrode support for wet-finger operation. Use Value: Hardware-based shield driver and differential sensing reduce false triggers from liquid contamination - validated per IEC 60601-1 leakage current limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C20234-12LQXI | Same PSoC 1 architecture, but only 16 GPIO and 16 CapSense inputs - no Port 1 LDO regulation. | Limited to smaller touch interfaces (e.g., 4-button + 1-slider); unsuitable for designs requiring regulated 3.0 V I/O drive. | Select when BOM cost reduction is critical and CapSense channel count is ≤16 with no regulated I/O requirement. |
| MTCH101-I/ST | Standalone CapSense controller (Microchip), 8-channel, I²C-only interface, no onboard CPU or flash memory. | Requires external MCU for event processing and firmware logic; lacks programmability for custom algorithms or firmware updates. | Select for ultra-low-cost, fixed-function touch applications where sensor count is low and host MCU handles all logic. |
Compared with CY8C20234-12LQXI and MTCH101-I/ST, CY8C20434-12LQXI provides full programmability, 28-capacitive-input scalability, and integrated 3.0 V LDO - making it optimal for mid-to-high channel-count touch interfaces needing autonomous operation and field-upgradable firmware.
Availability
CY8C20434-12LQXI is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, smart thermostats, and medical device touch keypads requiring stable component supply, long-term lifecycle support, and qualified industrial-grade operation.
Supply support for CY8C20434-12LQXI 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 acquired Cypress Semiconductor in 2020 and now owns and supports the full PSoC® portfolio, including legacy CapSense-enabled devices - delivering automotive-grade reliability and global manufacturing scale.
CY8C20434-12LQXI belongs to the PSoC® 1 family, designed specifically for cost-sensitive, low-power capacitive touch applications where hardware-accelerated sensing, minimal external components, and field-programmable flexibility are essential.
FAQ
Does CY8C20434-12LQXI support glove touch operation?
Yes - its CapSense block supports shield electrode configuration and adjustable sensitivity thresholds, enabling reliable detection through standard cotton or synthetic gloves. Firmware tuning via PSoC Designer allows optimization for specific glove thickness and material, with documented performance up to 3 mm thickness in reference designs.
Can the internal 3.0 V LDO power external components?
The internal LDO supplies only Port 1 I/O pins with a maximum total source current of 20 mA. It is not intended to power external ICs or loads beyond the GPIO drivers. For external 3.0 V rail generation, a discrete LDO or DC-DC converter is required per datasheet Section 5.2.2.
Is ISSP programming supported after soldering to PCB?
Yes - In-System Serial Programming (ISSP) uses dedicated pins (SDA, SCL, XRES, VDD, VSS) and requires only 5 connections. The device supports full flash programming and verification while mounted, provided board layout meets minimum trace length and noise immunity requirements outlined in AN2397.
What is the maximum number of simultaneous CapSense sensors?
The device supports up to 28 independent capacitive sensing elements, limited by GPIO count and analog mux routing. All 28 can be scanned in sequence within one frame; simultaneous measurement is not supported, but hardware-accelerated scanning achieves full-frame update rates >100 Hz with typical sensor configurations.
CY8C20434-12LQXI 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:
CY8C20434-12LQXI FAQ
1.How can I place an order for CY8C20434-12LQXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20434-12LQXI 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 CY8C20434-12LQXI reliable?
The price and inventory of CY8C20434-12LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20434-12LQXI is usually 5 days.
3.What payment methods are accepted for CY8C20434-12LQXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20434-12LQXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20434-12LQXI?
CY8C20434-12LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20434-12LQXI 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 CY8C20434-12LQXI?
For technical support, including CY8C20434-12LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20434-12LQXI requirements.
6.How does Aetrix verify that CY8C20434-12LQXI is sourced from the original manufacturer or authorized distributors?
All CY8C20434-12LQXI 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 CY8C20434-12LQXI meets industry standards.
7.What is the process for return or replacement of CY8C20434-12LQXI?
All CY8C20434-12LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20434-12LQXI, 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 CY8C20434-12LQXI part is unused and in its original packaging.
Return procedure for CY8C20434-12LQXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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