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Infineon Technologies CY8C4126AXI-S423
- Part No.:
- CY8C4126AXI-S423
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
CY8C4126AXI-S423.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
CY8C4126AXI-S423 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 up to 36 GPIOs-used in touch-enabled human-machine interfaces for industrial control panels and consumer appliances.
For engineers reviewing the CY8C4126AXI-S423 datasheet, CY8C4126AXI-S423 pinout, CY8C4126AXI-S423 application, or CY8C4126AXI-S423 equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-context insights for embedded system integration, low-power HMI development, and CAPSENSE™-based touch interface implementation.
Technical Context
The device integrates a single-cycle multiply Arm® Cortex®-M0+ core with dedicated PSoC™ programmable analog (two opamps, 12-bit SAR ADC, two IDACs, two low-power comparators) and digital resources (five TCPWM blocks, three SCBs supporting I²C/SPI/UART, programmable logic). All analog peripherals remain operational in Deep Sleep mode.
Its clock system combines ±2% IMO, 32 kHz ILO, and WCO support; GPIOs are fully reconfigurable for CAPSENSE™, analog, or digital roles with programmable drive strength and slew rate-enabling hardware-level signal conditioning and timing-critical event handling without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm® Cortex®-M0+, 48 MHz max - enables real-time deterministic execution of mixed-signal firmware with single-cycle multiply acceleration. |
| Memory | 64 KB flash + 8 KB SRAM - sufficient for CAPSENSE™ firmware, communication stacks, and application logic with zero external memory dependency. |
| Analog Peripherals | 12-bit 1-Msps SAR ADC, two opamps, two IDACs, two low-power comparators - supports simultaneous sensor signal acquisition, conditioning, and threshold detection in ultra-low-power modes. |
| Digital Peripherals | Five TCPWM blocks (center/edge-aligned PWM), three SCBs (reconfigurable I²C/SPI/UART), quadrature decoder - enables motor control, serial interfacing, and position sensing in one chip. |
| Power & Sleep | 1.71–5.5 V supply range; Deep Sleep current = 2.5 µA with analog active - allows battery-powered touch interfaces to maintain wake-on-touch capability for >1 year on coin cell. |
| Capacitive Sensing | CAPSENSE™ sigma-delta engine with >5:1 SNR and water tolerance + SmartSense auto-tuning - eliminates manual calibration and enables robust touch operation in humid or wet environments. |
| GPIO | Up to 36 pins, all configurable as CAPSENSE™, analog, or digital I/O with programmable drive strength/slew rate - simplifies PCB routing and eliminates external level shifters or buffers. |
Pinout & Package
Package: 48-pin TQFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, lead-free, moisture sensitivity level 3.
| 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; requires local 100 nF decoupling. |
| VSS | Ground reference | Digital and analog ground common point; must be low-impedance connection to minimize noise coupling into CAPSENSE™. |
| XRES | Active-low reset input | Asynchronous reset pin; internal pull-up enabled; compatible with open-drain pushbutton or supervisor IC assertion. |
| SWDCLK / SWDIO | Debug interface signals | Two-pin Serial Wire Debug interface for programming and real-time debugging; no external pull-ups required. |
| P0[0]–P0[7], P1[0]–P1[7], P2[0]–P2[7], P3[0]–P3[7], P4[0]–P4[7] | Programmable GPIO bank | All pins support CAPSENSE™, analog input/output, digital I/O, and serial peripheral functions; each configurable for drive strength (2–12 mA) and slew rate. |
Key Features
| Feature | Design Value |
|---|---|
| Reconfigurable analog blocks | Two opamps operate in comparator, buffer, or high-drive mode-including Deep Sleep operation-enabling always-on sensor monitoring without waking CPU. |
| Hardware-accelerated CAPSENSE™ | Sigma-delta modulation with >5:1 SNR and automatic SmartSense tuning reduces firmware overhead and eliminates manual parameter adjustment across production units. |
| Runtime-reconfigurable SCBs | Three serial blocks dynamically switch between I²C, SPI, and UART protocols under firmware control-eliminates need for multiple fixed-function peripherals or external bridges. |
| Programmable TCPWM | Five independent 16-bit timer/counter/PWM units support center-aligned PWM, quadrature decoding, and comparator-triggered kill signals-ideal for BLDC motor control and safety-critical timing. |
| Flexible clock system | Integrated ±2% IMO, 32 kHz ILO, and WCO support enable precise timing for RTC, low-power wake-up, and high-accuracy serial communication without external crystals. |
Applications
| Industrial HMI Panels | Smart Home Appliances |
|---|---|
|
Use Scenario: Touch-based operator interface on PLC-mounted control panels exposed to dust, vibration, and EMI. IC Role / Device Role / Timing Role: Primary MCU executing CAPSENSE™ firmware, managing RS-485 communication, and driving LED indicators via GPIO PWM. Use Value: Integrated analog front-end and Deep Sleep operation reduce BOM count and extend panel battery life while maintaining reliable touch response in harsh environments. |
Use Scenario: Touch-sensitive cooktop or oven control with water splash resistance and multi-zone heating coordination. IC Role / Device Role / Timing Role: System-on-chip controller handling capacitive touch, thermal monitoring via SAR ADC, and triac firing timing using TCPWM kill signals. Use Value: Hardware CAPSENSE™ SNR >5:1 and SmartSense eliminate false triggers from condensation, and integrated PWM timing ensures precise heater control without jitter. |
| Medical Patient Monitors | Automotive Cabin Controls |
|
Use Scenario: Low-power bedside monitor with touch buttons, temperature sensing, and Bluetooth LE interface. IC Role / Device Role / Timing Role: Main controller running ModusToolbox™ middleware, acquiring analog sensor data, and managing BLE SCB communication. Use Value: 2.5 µA Deep Sleep with active analog blocks enables multi-week battery operation while retaining instant wake-on-touch capability. |
Use Scenario: Touch-enabled HVAC or infotainment bezel in automotive cabin with ESD immunity and wide temperature range. IC Role / Device Role / Timing Role: Dedicated touch controller interfacing with main ECU via I²C; handles CAPSENSE™ scanning and debouncing independently. Use Value: AEC-Q100 stress-tested variant availability (CY8C4126AZI-S423) ensures reliability; programmable GPIO drive strength accommodates varying overlay thicknesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C4026LQI-S423 | Lower memory (32 KB flash, 4 KB SRAM); no CAPSENSE™ sigma-delta block; uses legacy CSD instead of SmartSense. | Limited to basic proximity or button-only touch; unsuitable for slider/wheel gestures or wet-environment operation. | Select when cost sensitivity outweighs advanced CAPSENSE™ features and memory headroom is not required. |
| STM32G071KBT6 | No integrated CAPSENSE™; requires external RC network and firmware-based touch algorithm; lacks reconfigurable analog blocks. | Touch performance highly dependent on PCB layout and firmware tuning; no hardware-accelerated water tolerance or auto-calibration. | Choose only if leveraging existing STM32 ecosystem tools and external touch ICs are acceptable for system architecture. |
Compared with CY8C4126AXI-S423, CY8C4026LQI-S423 sacrifices CAPSENSE™ performance and memory for lower unit cost, while STM32G071KBT6 shifts capacitive sensing complexity to software and external components-increasing validation effort and reducing environmental robustness.
Availability
CY8C4126AXI-S423 is available at Aetrix Electronics and suitable for industrial HMI development, smart appliance control, and medical patient interface designs requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for CY8C4126AXI-S423 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, touch-enabled embedded applications requiring hardware-accelerated CAPSENSE™, flexible analog integration, and Arm®-based firmware scalability.
FAQ
What is the maximum operating frequency of the Arm® Cortex®-M0+ core in CY8C4126AXI-S423?
The CY8C4126AXI-S423 operates its Arm® Cortex®-M0+ CPU at up to 48 MHz, supported by an internal ±2% main oscillator (IMO) or external crystal. This frequency is sustained across the full 1.71–5.5 V supply range and ambient temperature of –40°C to +85°C, with no derating required for typical industrial use cases.
Does CY8C4126AXI-S423 support hardware-accelerated capacitive sensing with water tolerance?
Yes. The device integrates Infineon's CAPSENSE™ sigma-delta sensing engine with documented signal-to-noise ratio exceeding 5:1 and certified water tolerance per IEC 61000-4-6. SmartSense auto-tuning adjusts baseline and thresholds in real time, eliminating manual calibration and enabling reliable operation under condensation or light splashing.
Can all GPIO pins be used for CAPSENSE™, analog, and digital functions simultaneously?
No-while any GPIO pin can be individually configured for CAPSENSE™, analog, or digital roles, concurrent use depends on resource allocation. For example, using a pin for analog input disables its use as a CAPSENSE™ sensor in the same scan cycle; however, dynamic reconfiguration at runtime is supported via PDL APIs without reset.
What debug interface does CY8C4126AXI-S423 use, and is external hardware required?
CY8C4126AXI-S423 uses a two-pin Serial Wire Debug (SWD) interface (SWDCLK and SWDIO) compliant with ARM CoreSight. No external level shifters or debug probes are required-standard CMSIS-DAP or Segger J-Link debuggers connect directly. SWD remains functional in all power modes except Hibernate.
CY8C4126AXI-S423 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 44-LQFP
- 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, POR, PWM, WDT
- Number of I/O:
- 36
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K 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:
CY8C4126AXI-S423 FAQ
1.How can I place an order for CY8C4126AXI-S423 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C4126AXI-S423 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 CY8C4126AXI-S423 reliable?
The price and inventory of CY8C4126AXI-S423 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4126AXI-S423 is usually 5 days.
3.What payment methods are accepted for CY8C4126AXI-S423?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4126AXI-S423 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C4126AXI-S423?
CY8C4126AXI-S423 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C4126AXI-S423 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 CY8C4126AXI-S423?
For technical support, including CY8C4126AXI-S423 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4126AXI-S423 requirements.
6.How does Aetrix verify that CY8C4126AXI-S423 is sourced from the original manufacturer or authorized distributors?
All CY8C4126AXI-S423 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 CY8C4126AXI-S423 meets industry standards.
7.What is the process for return or replacement of CY8C4126AXI-S423?
All CY8C4126AXI-S423 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4126AXI-S423, 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 CY8C4126AXI-S423 part is unused and in its original packaging.
Return procedure for CY8C4126AXI-S423:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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