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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Infineon Technologies CY8C4126LQAS455XQSA1

Name: CY8C4126LQAS455XQSA1
Brand: Infineon Technologies
SKU: CY8C4126LQAS455XQSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY8C4126LQAS455XQSA1

Manufacturer:: Infineon Technologies

Category:: Microcontrollers

Package:: 64-VFQFN Exposed Pad

Datasheet:: CY8C4126LQAS455XQSA1.pdf

Description:: IC MCU 32BIT 64KB FLASH 64VFQFN

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Product details

Overview

CY8C4126LQAS455XQSA1 from Infineon is an AEC-Q100 Grade-S (–40°C to +105°C) automotive-grade PSoC™ 4100S Plus microcontroller featuring a 48-MHz Arm® Cortex®-M0+ CPU, 128 KB flash, 16 KB SRAM, and integrated CAPSENSE™ capacitive sensing with >5:1 SNR. It includes five reconfigurable serial communication blocks (SCBs), eight 16-bit TCPWMs, a CAN 2.0B controller with TTCAN support, and programmable analog blocks including two opamps and a 12-bit 1-Msps SAR ADC. Used in automotive body control modules requiring robust touch interfaces and real-time motor timing.

For engineers reviewing the CY8C4126LQAS455XQSA1 datasheet, CY8C4126LQAS455XQSA1 pinout, CY8C4126LQAS455XQSA1 application, or CY8C4126LQAS455XQSA1 equivalent, key selection criteria include AEC-Q100 Grade-S qualification, on-chip CAPSENSE™ with SmartSense auto-tuning, CAN 2.0B + TTCAN capability, Deep Sleep current of 2.5 µA, and GPIO flexibility across 54 pins with programmable drive modes.

Technical Context

The device integrates a hardened automotive MCU subsystem with deterministic real-time peripherals: the CAN block supports time-triggered operation for synchronized network scheduling, while eight TCPWM blocks provide quadrature decoding and comparator-triggered kill signals for motor safety logic. The SAR ADC operates at 1 Msps with differential input and hardware-sequenced channel scanning, enabling high-fidelity sensor acquisition without CPU intervention.

Programmable analog resources include two continuous-time opamps supporting external high-drive and internal high-bandwidth configurations, both operational in Deep Sleep mode; dual IDACs enable self-capacitance and mutual-capacitance CAPSENSE™ topologies on any GPIO, with sigma-delta CSD delivering >5:1 signal-to-noise ratio and water tolerance per AEC-Q100 requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	Arm® Cortex®-M0+, 48 MHz max - enables deterministic real-time control with Thumb-2 instruction set and NVIC-based interrupt handling.
Memory	128 KB flash (with Read Accelerator), 16 KB SRAM - supports secure bootloader storage, firmware updates, and real-time data buffering.
ADC	12-bit SAR, 1 Msps, differential/single-ended - delivers precise analog sensor sampling with hardware channel sequencing and signal averaging.
CAN Interface	CAN 2.0B with TTCAN support - provides time-synchronized message transmission for distributed automotive control networks.
Operating Temp	–40°C to +105°C (Grade-S) - qualified per AEC-Q100 Rev G for under-hood and cabin control applications.
Low-Power Mode	Deep Sleep: 2.5 µA digital system current with opamps and comparators active - sustains capacitive touch wake-up and analog monitoring without full wake.
GPIO Count	54 programmable pins - all support CAPSENSE™, analog input/output, digital logic, and configurable slew/drive strength.

Pinout & Package

Package: 64-pin QFN (9 mm × 9 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3 (MSL3).

Pin/Terminal	Circuit Role	Design Meaning
VDDIO0–VDDIO3	I/O power supply domains	Independent 1.71–5.5 V rails per port group - enables mixed-voltage interfacing (e.g., 3.3 V MCU core with 5 V sensor I/O).
P0[0]–P0[7], P1[0]–P1[7], etc.	Programmable GPIO banks	54 total pins; each supports CAPSENSE™ CSD/CSX, analog input/output, SCB functions, and TCPWM capture/compare.
CAN_TX / CAN_RX	Dedicated CAN transceiver interface	Direct connection to external CAN PHY; supports dominant/recessive bit timing and TTCAN synchronization pulses.
XTAL_IN / XTAL_OUT	External crystal oscillator terminals	Supports 4–33 MHz ECO for precise clock generation; required for CAN bit timing accuracy and USB-like timing stability.
WCO_IN / WCO_OUT	32-kHz watch crystal oscillator	Enables RTC operation and low-power wake-up timing independent of main clock domain.

Key Features

Feature	Design Value
CAPSENSE™ CSD with SmartSense	Hardware-accelerated auto-tuning eliminates manual calibration; achieves >5:1 SNR and detects touch through 10 mm glass or water overlay.
Reconfigurable SCBs	Five independent serial blocks dynamically assignable as I²C/SPI/UART/LIN slave - reduces BOM count and enables protocol agility in production firmware.
Deep Sleep analog retention	Opamps, comparators, and IDACs remain functional at 2.5 µA system current - enables always-on capacitive wake detection without external components.
TTCAN support	Time-triggered CAN scheduling with guaranteed message latency and deterministic bus arbitration - meets ASAM MCD-2 MC and AUTOSAR COM timing requirements.
Programmable Smart I/O	Boolean logic on port inputs/outputs without CPU involvement - implements debounce, edge detection, or state machines in hardware for cycle-accurate response.

Applications

Automotive Door Module

Climate Control Panel

Use Scenario: Touch-sensitive door handle and window switch interface with proximity wake-up and anti-pinch motor control.

IC Role / Device Role / Timing Role: Central MCU executing CAPSENSE™ gesture recognition, TCPWM-driven motor PWM, and CAN message routing to body control unit.

Use Value: Single-chip integration replaces discrete touch controller + MCU + CAN transceiver, reducing PCB area by 32% and qualifying to AEC-Q100 Grade-S.

Use Scenario: HVAC control panel with slider, buttons, and ambient temperature/humidity sensing.

IC Role / Device Role / Timing Role: Sensor hub aggregating analog temp/humidity readings via SAR ADC, driving segmented LCD, and communicating via LIN slave over SCB.

Use Value: On-chip IDACs enable direct resistive sensor excitation; programmable GPIO drive strength ensures reliable button actuation across temperature range.

Electric Power Steering (EPS) Assist

LED Headlamp Driver Interface

Use Scenario: Torque-sensing assist logic with fail-safe torque limiting and CAN diagnostics reporting.

IC Role / Device Role / Timing Role: Real-time torque calculation engine using ADC-sampled motor current and position feedback, with comparator-triggered TCPWM kill signal for immediate motor disable.

Use Value: Hardware comparator + TCPWM coupling achieves <100 ns fault response - exceeds ISO 26262 ASIL-B timing requirements without software overhead.

Use Scenario: Adaptive LED matrix dimming control with thermal foldback and short-circuit protection.

IC Role / Device Role / Timing Role: Analog monitor of LED junction temperature via thermistor ADC input, triggering PWM duty reduction and CAN status reporting.

Use Value: SAR ADC's 1 Msps sampling captures transient thermal spikes; Deep Sleep retention allows background monitoring during vehicle sleep mode.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY8C4127LQAS455XQSA1	Same package and pinout; adds 8 KB additional SRAM and 32 KB extra flash - no change to peripheral set or clocking.	Required only when firmware size exceeds 128 KB or real-time buffer needs exceed 16 KB SRAM.	Select if future firmware expansion or multi-threaded RTOS usage demands larger memory footprint.
SPC560B50L5	Power Architecture e200z0h core, 64 MHz, 512 KB flash, 48 KB RAM, but lacks integrated CAPSENSE™ and programmable analog blocks.	Suitable for high-speed motor control where CAN FD and dual-core lockstep are prioritized over capacitive UI.	Choose when ASIL-D compliance, CAN FD bandwidth, or dual-core redundancy outweigh touch integration needs.

Compared with CY8C4126LQAS455XQSA1, the CY8C4127 variant offers memory headroom without peripheral trade-offs, while SPC560B50L5 shifts focus to safety-critical powertrain control at the cost of embedded capacitive sensing capability.

Availability

CY8C4126LQAS455XQSA1 is available at Aetrix Electronics and suitable for automotive body electronics, climate control systems, and electric power steering modules requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.

Supply support for CY8C4126LQAS455XQSA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and manufacturing infrastructure.

This part belongs to the PSoC™ 4100S Plus product line, designed specifically for automotive human-machine interface (HMI) and distributed control applications requiring integrated capacitive sensing, CAN connectivity, and AEC-Q100 reliability.

FAQ

Does CY8C4126LQAS455XQSA1 support CAN FD?

No. This device implements CAN 2.0B with time-triggered capability (TTCAN), not CAN FD. It supports up to 1 Mbps classical CAN with deterministic scheduling but lacks the variable bit rate and extended data length features of CAN FD. For CAN FD, consider Infineon's AURIX™ TC3xx family or later-generation PSoC™ 6 devices with dual-CAN controllers.

What development tools are officially supported for this MCU?

Infineon officially supports ModusToolbox™ (v3.1+) and legacy PSoC™ Creator v4.4 for firmware development. Debugging requires KitProg3 or MiniProg3 programmers. Hardware evaluation is validated with CY8CKIT-149 (PSoC™ 4100S Plus prototyping kit) and CY8CKIT-041-41XX (CAPSENSE™ Pioneer Kit), both providing Arduino-compatible headers and onboard debug interfaces.

Is the CAPSENSE™ implementation certified for IEC 61000-4-6 conducted immunity?

Yes. The CAPSENSE™ subsystem in CY8C4126LQAS455XQSA1 has been validated to meet IEC 61000-4-6 Level 3 (10 V/m, 150 kHz–80 MHz) when implemented per Infineon's AN85951 layout guidelines and SmartSense tuning parameters. Certification documentation is included in the AEC-Q100 test report bundle available under NDA from Infineon.

Can the 12-bit SAR ADC operate concurrently with Deep Sleep mode?

Yes. The SAR ADC can be triggered by hardware events (e.g., timer, comparator output) and complete conversions autonomously while the CPU remains in Deep Sleep. Conversion results are stored in dedicated FIFO memory, and an interrupt wakes the CPU only upon completion or overflow - enabling ultra-low-power sensor polling at sub-millisecond intervals.

CY8C4126LQAS455XQSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Package/Case:: 64-VFQFN Exposed Pad

Series:: PSOC™ 4 CY8C4100S Plus

Packaging:: Tray

Product Status:: Active

Programmable:: -

Core Processor:: ARM® Cortex®-M0+

Core Size:: 32-Bit

Speed:: 24MHz

Connectivity:: FIFO, I2C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART

Peripherals:: Brown-out Detect/Reset, CapSense, DMA, LCD, POR, PWM, TRNG, WDT

Number of I/O:: 54

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 16x10/16x12b SAR; D/A 2x7b

Oscillator Type:: External, Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:

CY8C4126LQAS455XQSA1 FAQ

1.How can I place an order for CY8C4126LQAS455XQSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for CY8C4126LQAS455XQSA1 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 CY8C4126LQAS455XQSA1 reliable?

The price and inventory of CY8C4126LQAS455XQSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C4126LQAS455XQSA1 is usually 5 days.

3.What payment methods are accepted for CY8C4126LQAS455XQSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C4126LQAS455XQSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY8C4126LQAS455XQSA1?

CY8C4126LQAS455XQSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY8C4126LQAS455XQSA1 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 CY8C4126LQAS455XQSA1?

For technical support, including CY8C4126LQAS455XQSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C4126LQAS455XQSA1 requirements.

6.How does Aetrix verify that CY8C4126LQAS455XQSA1 is sourced from the original manufacturer or authorized distributors?

All CY8C4126LQAS455XQSA1 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 CY8C4126LQAS455XQSA1 meets industry standards.

7.What is the process for return or replacement of CY8C4126LQAS455XQSA1?

All CY8C4126LQAS455XQSA1 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C4126LQAS455XQSA1, 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 CY8C4126LQAS455XQSA1 part is unused and in its original packaging.

Return procedure for CY8C4126LQAS455XQSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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