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Infineon Technologies CY8C4125LQI-S433T
- Part No.:
- CY8C4125LQI-S433T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 40-UFQFN Exposed Pad
- Datasheet:
-
CY8C4125LQI-S433T.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
CY8C4125LQI-S433T from Infineon is a programmable 32-bit Arm® Cortex®-M0+ microcontroller with 48 MHz CPU, 64 KB flash, 8 KB SRAM, integrated CAPSENSE™ capacitive sensing, 12-bit 1-Msps SAR ADC, and three reconfigurable serial communication blocks (I²C/SPI/UART). It supports deep-sleep operation at 2.5 µA and delivers high SNR (>5:1) touch performance in consumer HMI and industrial control panels.
For engineers reviewing the CY8C4125LQI-S433T datasheet, CY8C4125LQI-S433T pinout, CY8C4125LQI-S433T application, or CY8C4125LQI-S433T equivalent, this device is selected for embedded systems requiring mixed-signal reconfigurability, low-power capacitive touch, and runtime peripheral flexibility without external analog components.
Technical Context
The CY8C4125LQI-S433T integrates a fixed-function Arm® Cortex®-M0+ core with fully programmable analog (two opamps, two comparators, IDACs, CSD block) and digital (TCPWM, SCB, PLD) subsystems. Its SmartSense™ auto-tuning and hardware-accelerated sigma-delta CAPSENSE™ eliminate manual calibration.
It features five 16-bit TCPWM blocks supporting center-aligned PWM and quadrature decoding, plus three SCBs that dynamically switch between I²C, SPI, and UART protocols - enabling single-firmware support across multiple interface requirements in field-deployed devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+ @ 48 MHz - enables real-time deterministic control with single-cycle multiply for motor or sensor fusion tasks. |
| Memory | 64 KB flash + 8 KB SRAM - sufficient for bootloader, firmware, and CAPSENSE™ tuning data storage without external memory. |
| ADC | 12-bit SAR @ 1 Msps with sequencer & averaging - supports simultaneous multi-channel sensor acquisition with noise reduction in noisy industrial environments. |
| CAPSENSE™ | Sigma-delta CSD with >5:1 SNR and water tolerance - enables reliable touch buttons/sliders on wet or gloved-user interfaces without shield layers. |
| Power Modes | Deep Sleep @ 2.5 µA with active analog - allows battery-powered devices to maintain touch wake-up capability for >1 year on coin cell. |
| GPIO | 36 programmable pins with configurable drive strength/slew rate - supports direct LCD segment drive, analog input, or digital logic routing without discrete level shifters. |
| Clock Sources | IMO (±2%), ILO (32 kHz), WCO - provides accurate timing for RTC, USB-free HID reporting, and low-jitter PWM generation. |
Pinout & Package
This device is housed in a 44-lead TQFP package (10 mm × 10 mm, 0.8 mm pitch) with exposed thermal pad. All GPIO pins support dynamic reassignment to analog, digital, or CAPSENSE™ functions via firmware configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply | Accepts 1.71–5.5 V; powers digital core, analog blocks, and I/O banks - enables single-rail system design with no LDO required. |
| VSS | Digital ground | Reference for all digital logic and SWD debug interface; must be low-impedance connection to minimize switching noise coupling into analog sections. |
| P0[0]–P0[7] | Programmable GPIO | Support CAPSENSE™ CSD, analog input, or high-drive LCD segment output - eliminates need for external touch controller or display driver IC. |
| SWDCLK / SWDIO | Debug interface | 2-pin ARM Serial Wire Debug - enables in-system programming and real-time trace without dedicated JTAG header footprint. |
| XRES | External reset input | Active-low asynchronous reset with internal pull-up - allows clean system recovery from brown-out or ESD events without external RC network. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware CAPSENSE™ Engine | Dedicated sigma-delta modulator with automatic SmartSense™ tuning - reduces firmware development time by >70% versus software-based touch solutions. |
| Reconfigurable SCBs | Three independent serial blocks each configurable as I²C master/slave, SPI master/slave, or UART - simplifies BOM by replacing multiple interface ICs with one MCU. |
| Programmable Analog Blocks | Two opamps with internal/external drive modes + two low-power comparators active in Deep Sleep - enables sensor signal conditioning and wake-on-event without CPU intervention. |
| Flexible TCPWM | Five 16-bit timer/counter/PWM units with quadrature decode and comparator-triggered kill signals - supports BLDC motor commutation and safety-critical shutdown paths. |
| LCD Segment Drive | Direct GPIO-based segment drive up to 4×28 segments - eliminates external LCD driver IC in cost-sensitive instrumentation displays. |
Applications
| Home Appliance Control Panel | Industrial HMI Terminal |
|---|---|
|
Use Scenario: Touch-enabled oven/microwave front panel with slider controls and status LEDs. IC Role / Device Role / Timing Role: Primary system controller managing CAPSENSE™ inputs, LED PWM dimming, and relay timing via TCPWM blocks. Use Value: Single-chip solution replaces MCU + touch controller + LED driver, reducing PCB area by 35% and eliminating inter-IC communication latency. |
Use Scenario: Ruggedized factory-floor operator terminal with glove-compatible touch and RS-485 connectivity. IC Role / Device Role / Timing Role: Main processor handling CAPSENSE™ with water tolerance, isolated UART-to-RS485 translation via SCB, and watchdog-managed fault recovery. Use Value: Maintains touch responsiveness under condensation while supporting legacy industrial bus protocols without external transceivers. |
| Portable Medical Device UI | Smart Lighting Control Node |
|
Use Scenario: Battery-powered glucose meter with capacitive buttons and OLED display interface. IC Role / Device Role / Timing Role: System-on-chip managing ultra-low-power touch wake-up, ADC-based sensor reading, and SPI-driven OLED refresh. Use Value: Achieves >18-month battery life using Deep Sleep mode with active analog, avoiding external PMIC or touch interrupt controller. |
Use Scenario: DALI-compliant LED driver with dimmer knob emulation and color temperature adjustment. IC Role / Device Role / Timing Role: CAPSENSE™ slider for intuitive dimming, TCPWM for precise 0–10 V analog dimming output, and SCB configured as DALI transceiver. Use Value: Integrates human interface, analog output generation, and lighting protocol stack in one die - cuts bill-of-materials by 4 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4025LQI-S412 | Lower memory (32 KB flash / 4 KB SRAM); no CSD block; only one SCB | Limited to basic touchless UI or simple sensor node without CAPSENSE™ or multi-protocol needs | Select when cost sensitivity outweighs reconfigurability and touch performance requirements. |
| STM32G071KBT6 | No integrated CAPSENSE™ engine; requires external components for robust touch; higher active current (50 µA/MHz) | Suitable for general-purpose control but adds design complexity and test overhead for touch applications | Choose only if existing STM32 toolchain familiarity offsets CAPSENSE™ development time and analog integration benefits. |
Compared with CY8C4125LQI-S433T, the CY8C4025LQI-S412 sacrifices touch capability and peripheral flexibility for lower unit cost, while the STM32G071KBT6 demands external circuitry and firmware effort to match basic capacitive sensing reliability - making the CY8C4125LQI-S433T optimal for touch-centric designs where time-to-market and analog integration are critical.
Availability
CY8C4125LQI-S433T is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI terminals, portable medical UIs, and smart lighting control nodes requiring stable component supply and long-term manufacturability.
Supply support for CY8C4125LQI-S433T 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 German semiconductor manufacturer specializing in power management, automotive MCUs, and secure microcontrollers, with global manufacturing and quality certifications including ISO/TS 16949 and ISO 9001.
This part belongs to the PSoC™ 4100S product line - designed specifically for embedded systems needing seamless integration of capacitive sensing, programmable analog, and Arm®-based digital control in a single chip.
FAQ
Does CY8C4125LQI-S433T support USB connectivity?
No, CY8C4125LQI-S433T does not include a USB PHY or USB controller. It relies on its three reconfigurable SCBs for I²C, SPI, or UART communication. For USB host/device functionality, an external USB-to-UART bridge (e.g., CP2102N) or companion USB-capable MCU is required.
Can the internal opamps drive external loads directly?
Yes - each of the two continuous-time opamps supports high-drive external mode with up to ±25 mA output current and rail-to-rail swing, enabling direct driving of small solenoids, LEDs, or sensor excitation circuits without external buffers.
Is SmartSense™ tuning compatible with custom PCB layouts?
Yes - SmartSense™ operates independently of layout parasitics by performing real-time capacitance measurement and adaptive threshold adjustment. It supports flexible electrode geometry, varying trace lengths, and overlay thicknesses up to 8 mm without firmware modification.
What debug interfaces are supported?
CY8C4125LQI-S433T supports ARM Serial Wire Debug (SWD) via dedicated SWDCLK and SWDIO pins. It does not support JTAG. Debugging is fully compatible with Infineon's ModusToolbox™ IDE and third-party tools like Segger J-Link and OpenOCD.
CY8C4125LQI-S433T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 40-UFQFN Exposed Pad
- Series:
- PSOC™ 4 CY8C4100S
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 24MHz
- Connectivity:
- I2C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART
- Peripherals:
- Brown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT
- Number of I/O:
- 34
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 5.5V
- Data Converters:
- A/D 16x10b Slope, 16x12b SAR; D/A 2xIDAC
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C4125LQI-S433T FAQ
1.How can I place an order for CY8C4125LQI-S433T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4125LQI-S433T 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 CY8C4125LQI-S433T reliable?
The price and inventory of CY8C4125LQI-S433T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4125LQI-S433T is usually 5 days.
3.What payment methods are accepted for CY8C4125LQI-S433T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4125LQI-S433T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4125LQI-S433T?
CY8C4125LQI-S433T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4125LQI-S433T 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 CY8C4125LQI-S433T?
For technical support, including CY8C4125LQI-S433T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4125LQI-S433T requirements.
6.How does Aetrix verify that CY8C4125LQI-S433T is sourced from the original manufacturer or authorized distributors?
All CY8C4125LQI-S433T 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 CY8C4125LQI-S433T meets industry standards.
7.What is the process for return or replacement of CY8C4125LQI-S433T?
All CY8C4125LQI-S433T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4125LQI-S433T, 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 CY8C4125LQI-S433T part is unused and in its original packaging.
Return procedure for CY8C4125LQI-S433T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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