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Infineon Technologies CY8C4125LQI-S432T
- Part No.:
- CY8C4125LQI-S432T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C4125LQI-S432T.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,706
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Product details
Overview
CY8C4125LQI-S432T 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, and reconfigurable analog/digital blocks. It supports deep-sleep operation at 2.5 µA digital current, features three SCBs for I²C/SPI/UART, five TCPWM blocks, and operates across 1.71–5.5 V for embedded human-interface and sensor-fusion applications.
For engineers reviewing the CY8C4125LQI-S432T datasheet, CY8C4125LQI-S432T pinout, CY8C4125LQI-S432T application, or CY8C4125LQI-S432T equivalent, this page delivers verified specifications, package mapping to 44-lead TQFP, confirmed GPIO reconfiguration capability, CAPSENSE™ SNR >5:1 performance, and validated alternatives for touch-enabled industrial control and consumer electronics design.
Technical Context
The device integrates a single-core Arm® Cortex®-M0+ CPU with hardware multiply and tightly coupled flash/SRAM subsystems. Its analog subsystem includes two continuous-time opamps (CTB), a 12-bit 1-Msps SAR ADC with sequencer and averaging, two low-power comparators active in Deep Sleep, and dual IDACs supporting both general-purpose and capacitive sensing on any GPIO.
Digital resources comprise five TCPWM blocks with quadrature decode and kill-signal triggering, three reconfigurable serial communication blocks (SCBs), programmable logic (PLD) for Boolean operations on port signals, and Smart I/O for autonomous peripheral interaction - all coordinated via a flexible clock tree with IMO (±2%), ILO (32 kHz), and WCO support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+ @ 48 MHz with single-cycle multiply - enables real-time deterministic control without software overhead. |
| Memory | 64 KB flash (with read accelerator) + 8 KB SRAM - supports medium-complexity firmware with fast interrupt response. |
| ADC | 12-bit SAR ADC @ 1 Msps with differential/single-ended modes and channel sequencer - captures high-fidelity sensor data with hardware averaging. |
| CAPSENSE™ | Sigma-delta capacitive sensing with >5:1 SNR and water tolerance - delivers robust touch detection in humid or wet environments. |
| Power Modes | Deep Sleep mode draws 2.5 µA digital current while maintaining operational analog blocks - extends battery life in always-on UI systems. |
| GPIO | Up to 36 programmable pins with configurable drive strength, slew rate, and CAPSENSE™/analog/digital roles - eliminates external level shifters or signal conditioning. |
| Serial Interfaces | Three SCBs supporting concurrent I²C, SPI, or UART - enables multi-protocol connectivity without dedicated peripherals. |
Pinout & Package
This device is packaged in a 44-lead TQFP (LQI) with 0.8 mm pitch and exposed thermal pad. Pin functions are fully reconfigurable via firmware, enabling dynamic assignment of analog, digital, CAPSENSE™, or communication roles per pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Accepts 1.71–5.5 V; powers digital core, analog blocks, and I/O banks. |
| GND | Ground reference | Common return path for analog/digital domains; requires low-impedance PCB connection. |
| XRES | External reset input | Active-low asynchronous reset; internal pull-up ensures reliable startup without external component. |
| SWDCLK / SWDIO | Debug interface signals | Supports programming and real-time debugging via ARM Serial Wire Debug (SWD) protocol. |
| P0[0]–P0[7], P1[0]–P1[7], etc. | Programmable GPIO terminals | Each pin supports CAPSENSE™, analog input/output, digital logic, or serial interface functions - assigned dynamically in firmware. |
Key Features
| Feature | Design Value |
|---|---|
| SmartSense™ auto-tuning | Hardware-accelerated CAPSENSE™ calibration eliminates manual tuning and compensates for environmental drift. |
| Reconfigurable SCBs | Each serial block can be independently set to I²C master/slave, SPI master/slave, or UART - reduces BOM count and layout complexity. |
| Deep Sleep analog retention | Opamps, comparators, and IDACs remain functional during 2.5 µA Deep Sleep - enables wake-on-touch or wake-on-threshold events. |
| Programmable CTB opamps | Two continuous-time opamps support high-drive external mode (25 mA) or high-bandwidth internal mode (10 MHz GBW) - adaptable to sensor signal conditioning or DAC buffering. |
| Quadrature decoding | TCPWM blocks natively decode rotary encoder signals with direction and count - offloads timing-critical computation from CPU. |
Applications
| Industrial HMI Panel | Smart Appliance Control |
|---|---|
Use Scenario: Touch-enabled operator interface on PLC-mounted panels with ambient moisture exposure. IC Role / Device Role / Timing Role: Primary MCU executing CAPSENSE™ scan, motor control PWM, and Modbus RTU over UART. Use Value: Water-tolerant sigma-delta sensing maintains reliability in washdown environments; Deep Sleep enables low-power status monitoring between user interactions. |
Use Scenario: Integrated touch control and sensor fusion in refrigerator door displays and temperature management. IC Role / Device Role / Timing Role: System-on-chip managing capacitive keys, thermistor ADC readings, fan speed PWM, and BLE coexistence via SCB-based UART. Use Value: Single-chip integration replaces discrete touch controller + MCU + analog front-end; 1.71–5.5 V operation accommodates variable battery or rail voltages. |
| Medical Patient Monitor UI | IoT Edge Sensor Node |
Use Scenario: Low-power bedside monitor with touch buttons and biopotential signal acquisition. IC Role / Device Role / Timing Role: CAPSENSE™ for non-mechanical controls; SAR ADC for ECG/temperature sampling; TCPWM for LED pulse modulation. Use Value: >5:1 SNR ensures false-trigger immunity near RF-emitting equipment; 2.5 µA Deep Sleep extends battery runtime beyond 12 months. |
Use Scenario: Battery-powered environmental sensor node measuring humidity, motion, and ambient light. IC Role / Device Role / Timing Role: Central controller for I²C sensors, capacitive wake-on-approach, and LoRaWAN UART interface. Use Value: Reconfigurable GPIO allows shared pins for CAPSENSE™ and I²C SDA/SCL; integrated IDACs enable direct resistive sensor excitation without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable microcontroller with capacitive sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4025LQI-S412 | Lower memory (32 KB flash / 4 KB SRAM); no TCPWM quadrature decoder; same 44-pin TQFP package. | Limited to simpler touch interfaces without motor feedback or complex timing; lacks hardware encoder support. | Select when cost sensitivity outweighs need for advanced timing or larger firmware footprint. |
| CY8C4127LQI-S433 | Same core/peripherals but in 48-pin TQFP; adds USBFS block and increases GPIO count to 40. | Required for designs needing native USB device interface or additional analog inputs beyond 36 pins. | Choose when USB connectivity or expanded I/O is mandatory; not drop-in compatible due to pinout expansion. |
Compared with CY8C4125LQI-S432T, CY8C4025LQI-S412 trades memory and timing features for lower unit cost, while CY8C4127LQI-S433 extends functionality with USB and extra pins - making the S432T optimal for balanced touch+control applications in compact 44-pin layouts.
Availability
CY8C4125LQI-S432T is available at Aetrix Electronics and suitable for industrial HMI panels, smart appliance control systems, medical patient monitor UIs, and IoT edge sensor nodes requiring stable component supply, long-term lifecycle assurance, and qualified reflow-compatible packaging.
Supply support for CY8C4125LQI-S432T 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 ICs, and programmable embedded systems, with global manufacturing and quality certification to ISO 9001 and IATF 16949.
This part belongs to the PSoC™ 4100S product line - designed specifically for cost-sensitive, low-power embedded systems requiring integrated capacitive touch, analog signal conditioning, and flexible digital logic without external glue logic.
FAQ
What development tools support CY8C4125LQI-S432T?
Infineon provides full toolchain support via ModusToolbox™ (v3.x+) and legacy PSoC™ Creator (v4.4). Both include BSPs, CAPSENSE™ Tuner, PDL drivers, and example projects for TCPWM, SCB, and SAR ADC. Debugging uses standard ARM SWD via KitProg3 or MiniProg4 programmers.
Does CY8C4125LQI-S432T support hardware encryption?
No. This device does not include cryptographic accelerators or secure key storage. It lacks AES, SHA, or TRNG modules. For secure boot or data encryption, external secure elements or software-based libraries must be used - consistent with its positioning as a cost-optimized general-purpose PSoC™ variant.
Can all GPIO pins perform CAPSENSE™ sensing simultaneously?
Yes - up to 36 pins support CAPSENSE™, but practical simultaneous scanning is limited by sigma-delta conversion time and noise coupling. Infineon's SmartSense™ auto-tuning adjusts scan parameters per electrode, enabling robust multi-button or slider operation without manual calibration.
Is the 44-pin TQFP package RoHS and REACH compliant?
Yes. CY8C4125LQI-S432T is manufactured in Infineon's certified facilities and meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation, including substance declarations and test reports, is available through Infineon's Quality Portal upon registration.
CY8C4125LQI-S432T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-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:
- 27
- 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-S432T FAQ
1.How can I place an order for CY8C4125LQI-S432T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4125LQI-S432T 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-S432T reliable?
The price and inventory of CY8C4125LQI-S432T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4125LQI-S432T is usually 5 days.
3.What payment methods are accepted for CY8C4125LQI-S432T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4125LQI-S432T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4125LQI-S432T?
CY8C4125LQI-S432T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4125LQI-S432T 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-S432T?
For technical support, including CY8C4125LQI-S432T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4125LQI-S432T requirements.
6.How does Aetrix verify that CY8C4125LQI-S432T is sourced from the original manufacturer or authorized distributors?
All CY8C4125LQI-S432T 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-S432T meets industry standards.
7.What is the process for return or replacement of CY8C4125LQI-S432T?
All CY8C4125LQI-S432T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4125LQI-S432T, 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-S432T part is unused and in its original packaging.
Return procedure for CY8C4125LQI-S432T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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