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Infineon Technologies CY8C4125LQI-S412
- Part No.:
- CY8C4125LQI-S412
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
CY8C4125LQI-S412.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
CY8C4125LQI-S412 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 1.71–5.5 V operation, deep-sleep mode at 2.5 µA, and drives up to 36 GPIOs in analog, digital, or capacitive sensing roles - used in touch-enabled industrial HMI and battery-powered consumer interfaces.
For engineers reviewing the CY8C4125LQI-S412 datasheet, CY8C4125LQI-S412 pinout, CY8C4125LQI-S412 application, or CY8C4125LQI-S412 equivalent, key selection considerations include its integrated 12-bit SAR ADC (1 Msps), dual opamps with deep-sleep operation, TCPWM timing flexibility, SCB-based I²C/SPI/UART reconfiguration, and SmartSense™ automatic capacitive tuning for water-tolerant touch panels.
Technical Context
The device implements a unified PSoC™ 4100S architecture where analog resources (CTB opamps, SAR ADC, CSD block) and digital resources (TCPWM, SCB, PLD) are routed via programmable interconnect to any GPIO. Its clock system integrates IMO (±2%), ILO (32 kHz), and WCO support for precision timing across sleep/wake transitions.
Capacitive sensing uses sigma-delta modulation with >5:1 SNR and hardware-accelerated SmartSense™ tuning - eliminating manual calibration. The five TCPWM blocks support center-aligned PWM, quadrature decoding, and comparator-triggered kill signals for motor control safety logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+ @ 48 MHz with single-cycle multiply - enables real-time sensor fusion and deterministic control loops. |
| Memory | 64 KB flash (with read accelerator) + 8 KB SRAM - sufficient for firmware with CAPSENSE™ middleware and communication stacks. |
| Analog Peripherals | 12-bit 1-Msps SAR ADC (differential/single-ended), two rail-to-rail opamps, two low-power comparators - all operable in Deep Sleep mode. |
| Capacitive Sensing | Sigma-delta CSD block with >5:1 SNR and SmartSense™ auto-tuning - delivers robust touch detection under moisture or EMI stress. |
| Digital Peripherals | Five 16-bit TCPWM blocks; three reconfigurable SCBs (I²C/SPI/UART); programmable logic (PLD) for glue logic offload. |
| Power & Packaging | 1.71–5.5 V supply; 2.5 µA Deep Sleep current; 48-pin TQFP (7 mm × 7 mm) package with 36 programmable GPIOs. |
| GPIO Flexibility | All pins support CAPSENSE™, analog input/output, or digital functions; drive strength, slew rate, and pull-up/down are software-configurable. |
Pinout & Package
CY8C4125LQI-S412 is housed in a 48-lead TQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. All pins support multiple functions via routing matrix; dedicated power/ground pins ensure stable analog/digital separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDD | Power supply inputs | VDDA powers analog blocks; VDDD powers digital logic; separate domains reduce noise coupling in mixed-signal operation. |
| GND, VSSA, VSSD | Ground returns | Separate analog/digital ground pins enable star grounding and minimize return-path interference in precision sensing. |
| P0[0]–P0[7], P1[0]–P1[7], P2[0]–P2[7], P3[0]–P3[7], P4[0]–P4[7], P5[0]–P5[3] | Programmable GPIOs | 36 pins configurable as CAPSENSE™ electrodes, ADC inputs, opamp terminals, or digital I/O with programmable drive modes. |
| XRES | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external pushbutton or supervisor IC assertion for controlled restart. |
| SWDCK / SWDIO | Debug interface | Two-pin Serial Wire Debug interface for programming and real-time debugging without dedicated JTAG pins. |
| XTAL_IN / XTAL_OUT | WCO crystal connection | Supports 32.768 kHz watch crystal for RTC and low-power wake-up timing with ±20 ppm stability. |
Key Features
| Feature | Design Value |
|---|---|
| Reconfigurable Analog Blocks | Two continuous-time opamps with high-drive external and high-bandwidth internal modes - enable sensor signal conditioning or active filtering without external components. |
| SmartSense™ Auto-Tuning | Hardware-accelerated capacitive sensing calibration - eliminates factory tuning steps and adapts to environmental drift in field use. |
| Deep Sleep with Active Analog | 2.5 µA system current while maintaining opamp, comparator, and CSD operation - extends battery life in always-on touch interfaces. |
| Runtime-Reconfigurable SCBs | Three serial blocks dynamically switch between I²C, SPI, and UART protocols - simplifies BOM by consolidating communication peripherals. |
| Programmable Digital Logic (PLD) | Boolean logic on port inputs/outputs implemented in hardware - replaces discrete gates and reduces firmware overhead for simple state machines. |
Applications
| Industrial HMI Panels | Smart Home Touch Controls |
|---|---|
|
Use Scenario: Wall-mounted thermostat with glass-front capacitive buttons and ambient light sensing. IC Role / Device Role / Timing Role: Main MCU handling CAPSENSE™ touch detection, temperature ADC sampling, and UART communication to HVAC controller. Use Value: Integrated CSD + SAR ADC eliminates external touch controller and sensor signal chain, reducing PCB area and BOM cost by 30%. |
Use Scenario: Battery-powered smart light switch with water-resistant touch surface and BLE co-processor interface. IC Role / Device Role / Timing Role: Low-power touch manager using Deep Sleep + SmartSense™, waking only on valid gesture to minimize average current. Use Value: 2.5 µA Deep Sleep current with active CSD enables 5-year coin-cell operation while maintaining instant wake responsiveness. |
| Medical Patient Interfaces | Appliance Control Panels |
|
Use Scenario: Disinfectant-resistant touch panel on infusion pump with glove-mode operation. IC Role / Device Role / Timing Role: CAPSENSE™ subsystem with >5:1 SNR and moisture tolerance, coupled with opamp-based ECG front-end buffering. Use Value: Sigma-delta CSD ensures reliable touch detection through latex gloves and liquid contamination - meeting IEC 60601-1 usability requirements. |
Use Scenario: Oven control panel with rotary encoder emulation and segmented LCD display. IC Role / Device Role / Timing Role: TCPWM quadrature decoder for knob input; LCD segment drive on GPIOs; SCB I²C to display driver. Use Value: Eliminates dedicated encoder IC and LCD controller, integrating human interface functions into single-chip solution with <10 ms response latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4025LQI-S402 | Lower memory (32 KB flash, 4 KB SRAM); no CSD block; same CPU and GPIO count. | Lacks CAPSENSE™ and analog sensing capability - suitable only for non-touch digital control tasks. | Select when touch interface is unnecessary and cost sensitivity outweighs future feature scalability. |
| STM32G031K8T6 | Arm Cortex-M0+, 64 KB flash, but no integrated capacitive sensing or programmable analog blocks; requires external components for touch. | Requires external touch controller and signal conditioning circuitry - increases design complexity and board area. | Choose if existing STM32 toolchain familiarity and ecosystem support outweigh need for integrated analog flexibility. |
Compared with CY8C4125LQI-S412, CY8C4025LQI-S402 sacrifices sensing integration for lower cost, while STM32G031K8T6 offers broader ARM ecosystem access but demands external analog components - making CY8C4125LQI-S412 optimal for rapid, compact touch-enabled embedded designs.
Availability
CY8C4125LQI-S412 is available at Aetrix Electronics and suitable for industrial HMI, smart home controls, and medical patient interfaces requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.
Supply support for CY8C4125LQI-S412 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, sensing, and microcontroller solutions for industrial, automotive, and IoT applications.
CY8C4125LQI-S412 belongs to the PSoC™ 4100S product line - designed specifically for cost-sensitive, space-constrained embedded systems needing integrated capacitive touch, analog signal conditioning, and flexible digital peripherals in a single chip.
FAQ
Does CY8C4125LQI-S412 support USB connectivity?
No, CY8C4125LQI-S412 does not include a USB PHY or controller. It relies on external USB-to-UART bridges (e.g., CP2102) or host-side USB enumeration for connectivity. Its three SCBs support I²C, SPI, and UART only - confirmed in the official datasheet section 2.5.2 and ordering information table.
What development tools are officially supported for this device?
Infineon officially supports ModusToolbox™ (v3.x+) and legacy PSoC™ Creator IDE for CY8C4125LQI-S412. Both provide CAPSENSE™ Tuner, PDL drivers, BSPs, and code generation for TCPWM, SCB, and analog blocks. Keil MDK and GCC-based toolchains are also validated via ModusToolbox™ integration.
Can the internal opamps drive external loads directly?
Yes - each opamp supports up to 25 mA output current in high-drive external mode and can directly drive resistive or capacitive loads such as sensor excitation circuits or LED bias networks. Output voltage swing is rail-to-rail, and gain configuration is programmable via firmware-controlled CTB registers.
Is the 48 MHz CPU frequency achievable across the full 1.71–5.5 V supply range?
Yes, the Arm Cortex-M0+ core operates at up to 48 MHz across the entire 1.71–5.5 V supply range, as verified in datasheet section 5.2.1 (Device Level Specifications) and confirmed by the IMO's ±2% accuracy specification over voltage and temperature - no frequency derating required.
CY8C4125LQI-S412 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- PSOC™ 4 CY8C4100S
- Packaging:
- Tray
- 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; D/A 2xIDAC
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C4125LQI-S412 FAQ
1.How can I place an order for CY8C4125LQI-S412 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4125LQI-S412 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-S412 reliable?
The price and inventory of CY8C4125LQI-S412 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4125LQI-S412 is usually 5 days.
3.What payment methods are accepted for CY8C4125LQI-S412?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4125LQI-S412 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4125LQI-S412?
CY8C4125LQI-S412 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4125LQI-S412 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-S412?
For technical support, including CY8C4125LQI-S412 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4125LQI-S412 requirements.
6.How does Aetrix verify that CY8C4125LQI-S412 is sourced from the original manufacturer or authorized distributors?
All CY8C4125LQI-S412 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-S412 meets industry standards.
7.What is the process for return or replacement of CY8C4125LQI-S412?
All CY8C4125LQI-S412 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4125LQI-S412, 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-S412 part is unused and in its original packaging.
Return procedure for CY8C4125LQI-S412:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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