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Infineon Technologies CY8C4125LQI-S423T
- Part No.:
- CY8C4125LQI-S423T
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 40-UFQFN Exposed Pad
- Datasheet:
-
CY8C4125LQI-S423T.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
CY8C4125LQI-S423T 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 operates from 1.71–5.5 V and supports deep-sleep mode at 2.5 µA, targeting touch-enabled industrial HMI and low-power embedded control.
For engineers reviewing the CY8C4125LQI-S423T datasheet, CY8C4125LQI-S423T pinout, CY8C4125LQI-S423T application, or CY8C4125LQI-S423T equivalent, key selection criteria include CAPSENSE™ SNR performance (>5:1), programmable analog/digital blocks, TCPWM kill-signal triggering for motor safety, and ModusToolbox™ software integration for rapid touch + control firmware development.
Technical Context
The device integrates a fixed-function Arm® Cortex®-M0+ core with fully reconfigurable analog (opamps, comparators, IDACs, CSD) and digital (PLD, TCPWM, SCB) subsystems routed via automatic interconnect fabric. Its CAPSENSE™ sigma-delta engine delivers hardware-accelerated touch sensing with SmartSense auto-tuning and water tolerance.
Clocking combines ±2% IMO, 32 kHz ILO, and external WCO for precision timing; power management enables Deep Sleep with active analog (opamps/comparators) and selective digital retention. GPIOs support programmable drive strength, slew rate, and multi-function assignment including LCD segment drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+ @ 48 MHz - single-cycle multiply, real-time deterministic execution for sensor fusion and control loops. |
| Memory | 64 KB flash (with read accelerator) + 8 KB SRAM - sufficient for CAPSENSE™ + BLE stack coexistence and field-upgradable firmware. |
| ADC | 12-bit SAR @ 1 Msps with sequencer & averaging - enables simultaneous multi-channel analog acquisition (e.g., temp, voltage, current) without CPU overhead. |
| CAPSENSE™ | Sigma-delta CSD with >5:1 SNR and hardware SmartSense tuning - eliminates manual calibration, supports wet-finger operation in consumer/industrial panels. |
| Power | 1.71–5.5 V supply; 2.5 µA Deep Sleep with opamps/comparators active - extends battery life in portable touch interfaces and wireless sensors. |
| Serial Interfaces | 3 × SCBs supporting I²C/SPI/UART concurrently - allows independent peripheral bridging (e.g., I²C sensor hub + SPI display + UART debug). |
| TCPWM | 5 × 16-bit Timer/Counter/PWM blocks with center-aligned, quadrature decode, and comparator-triggered kill signals - supports BLDC commutation and safety-critical motor control. |
Pinout & Package
Package: 44-pin TQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core/analog domain operation; decoupling required per datasheet layout guidelines. |
| P0[0]–P0[7], P1[0]–P1[7], P2[0]–P2[7], P3[0]–P3[7], P4[0]–P4[3] | Programmable GPIO | All 36 pins support CAPSENSE™, analog input/output, digital logic, LCD segment drive, and configurable drive modes (strong, open-drain, high-Z). |
| XRES | Active-low reset input | Asynchronous reset with internal pull-up; accepts external pushbutton or supervisor IC assertion for system-level recovery. |
| SWDCLK / SWDIO | Debug interface | Two-pin Serial Wire Debug (SWD) for programming, real-time trace, and non-intrusive debugging without halting CPU operation. |
| XTAL_IN / XTAL_OUT | WCO crystal connection | Supports 32.768 kHz watch crystal for RTC accuracy and low-power wake-up timing; internal load capacitance configurable. |
Key Features
| Feature | Design Value |
|---|---|
| Reconfigurable Analog Blocks | Two opamps with high-drive external/high-bandwidth internal modes + ADC input buffering - enables signal conditioning, active filtering, and sensor front-end integration without external components. |
| Hardware CAPSENSE™ Engine | Sigma-delta modulator with >5:1 SNR and automatic SmartSense tuning - reduces firmware development time by 70% vs. software-based touch algorithms and ensures robustness across humidity and contamination. |
| Programmable Digital Logic | PLD blocks performing Boolean operations on port I/O - implements glue logic, state machines, or interrupt pre-processing directly in hardware, offloading CPU cycles. |
| Flexible Serial Peripherals | Three SCBs independently configurable as I²C master/slave, SPI master/slave, or UART - eliminates need for external protocol translators in multi-interface systems. |
| Low-Power Timing | Five TCPWM blocks with comparator-triggered kill signals and quadrature decoding - enables safe, precise motor control with hardware-enforced fault response (<100 ns latency). |
Applications
| Industrial HMI Panels | Smart Home Thermostats |
|---|---|
|
Use Scenario: Touch-enabled control panel with temperature sensing, fan speed adjustment, and status LED feedback in factory environments. IC Role / Device Role / Timing Role: Main MCU executing CAPSENSE™ touch detection, 12-bit ADC reading thermistor/NTC, TCPWM driving PWM fans, and SCB managing I²C ambient sensor. Use Value: Single-chip integration replaces discrete touch controller + MCU + analog front-end, reducing BOM cost by ~35% and PCB area by 40%. |
Use Scenario: Battery-powered wall-mounted thermostat with capacitive buttons, ambient temperature/humidity sensing, and LCD display. IC Role / Device Role / Timing Role: System-on-chip handling CAPSENSE™ wake-up, low-power Deep Sleep (2.5 µA), SAR ADC sampling sensors, and LCD segment drive on GPIOs. Use Value: Eliminates external RTC and touch controller; SmartSense auto-tuning maintains button responsiveness across condensation and dust exposure. |
| Medical Patient Monitors | Appliance Control Boards |
|
Use Scenario: Portable vital sign monitor with touch interface, ECG front-end biasing, and optical sensor interfacing. IC Role / Device Role / Timing Role: Analog subsystem configures opamps for electrode biasing and ADC input buffering; digital subsystem manages UART data streaming to host. Use Value: Programmable opamp modes enable clinical-grade signal integrity; CAPSENSE™ meets IEC 60601-1 creepage requirements without mechanical switches. |
Use Scenario: Washing machine control board requiring water-tolerant touch controls, motor phase control, and temperature monitoring. IC Role / Device Role / Timing Role: CAPSENSE™ sigma-delta engine rejects noise from motor drivers; TCPWM blocks generate 3-phase commutation signals with hardware kill-line safety. Use Value: Water-tolerant touch eliminates sealed membrane overlays; comparator-triggered kill signals meet IEC 60730 Class B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4126LQI-S433 | Same package and core, but with 128 KB flash and 16 KB SRAM - no change in analog/digital peripheral count or CAPSENSE™ capability. | Required when firmware exceeds 64 KB or requires larger data buffers for logging or OTA updates. | Select only if memory headroom is insufficient; identical pinout and software compatibility reduce redesign risk. |
| STM32G071KBT6 | Arm® Cortex®-M0+, 64 MHz, 128 KB flash, 36 KB SRAM, but lacks integrated CAPSENSE™ and programmable analog blocks - requires external touch controller and opamp circuitry. | Suitable for non-touch applications or where discrete analog design is preferred; no hardware-accelerated sigma-delta sensing. | Choose when prioritizing raw CPU performance and memory over integrated analog/touch; adds BOM cost and layout complexity for touch functionality. |
Compared with CY8C4125LQI-S423T, CY8C4126LQI-S433 offers scalable memory without peripheral trade-offs, while STM32G071KBT6 provides higher clock speed and memory but demands external components to replicate CAPSENSE™ and programmable analog functions - increasing total system cost and validation effort.
Availability
CY8C4125LQI-S423T is available at Aetrix Electronics and suitable for industrial HMI, smart home thermostats, and medical patient monitors requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade traceability.
Supply support for CY8C4125LQI-S423T 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 markets.
CY8C4125LQI-S423T belongs to the PSoC™ 4100S family - designed specifically for cost-sensitive, low-power embedded systems requiring integrated capacitive touch, programmable analog, and flexible digital logic in a single chip.
FAQ
Does CY8C4125LQI-S423T support USB connectivity?
No. This device does not include a USB PHY or USB controller. Communication is limited to its three SCB modules (I²C, SPI, UART) and SWD debug interface. For USB host/device functionality, an external USB-to-UART bridge or companion MCU would be required.
What development tools are officially supported for CY8C4125LQI-S423T?
Infineon officially supports ModusToolbox™ (v3.x+) and legacy PSoC™ Creator (v4.4). ModusToolbox™ provides Eclipse-based IDE, BSPs, PDL drivers, CAPSENSE™ Tuner, and middleware; PSoC™ Creator offers schematic-driven design with automatic routing and API component libraries.
Can the internal opamps drive external loads directly?
Yes - each opamp supports up to 25 mA output current in high-drive external mode, enabling direct driving of LEDs, small solenoids, or transducer biasing without external buffers. Internal high-bandwidth mode is optimized for ADC input buffering and signal conditioning within the chip.
Is the CAPSENSE™ implementation compliant with IEC 61000-4-6 conducted immunity standards?
Yes - the hardware-accelerated sigma-delta CAPSENSE™ engine with SmartSense tuning meets IEC 61000-4-6 Level 3 (10 V/m) conducted immunity when implemented per Infineon's layout and shielding guidelines in AN92239 and the PSoC™ 4100S Hardware Design Guide.
CY8C4125LQI-S423T 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-S423T FAQ
1.How can I place an order for CY8C4125LQI-S423T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4125LQI-S423T 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-S423T reliable?
The price and inventory of CY8C4125LQI-S423T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4125LQI-S423T is usually 5 days.
3.What payment methods are accepted for CY8C4125LQI-S423T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4125LQI-S423T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4125LQI-S423T?
CY8C4125LQI-S423T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4125LQI-S423T 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-S423T?
For technical support, including CY8C4125LQI-S423T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4125LQI-S423T requirements.
6.How does Aetrix verify that CY8C4125LQI-S423T is sourced from the original manufacturer or authorized distributors?
All CY8C4125LQI-S423T 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-S423T meets industry standards.
7.What is the process for return or replacement of CY8C4125LQI-S423T?
All CY8C4125LQI-S423T units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4125LQI-S423T, 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-S423T part is unused and in its original packaging.
Return procedure for CY8C4125LQI-S423T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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