Infineon Technologies CY9AF421LWQN-G-JNE2

Overview

CY9AF421LWQN-G-JNE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 64 KB on-chip Flash, 4 KB SRAM, integrated CAN 2.0B interface (1 Mbps), 12-bit ADC (0.8 μs conversion), and 10-bit DAC. It operates at up to 40 MHz, supports four low-power modes (Sleep/Timer/RTC/Stop), and targets embedded motor control and industrial automation systems requiring real-time I/O and communication.

For engineers reviewing the CY9AF421LWQN-G-JNE2 datasheet, CY9AF421LWQN-G-JNE2 pinout, CY9AF421LWQN-G-JNE2 application, or CY9AF421LWQN-G-JNE2 equivalent, key selection criteria include its dual watchdog timers (HW/SW), RTC with leap-year support, 51 GPIOs in 64-pin LQFP, and IGBT-mode PWM with dead-time insertion for motor drive timing integrity.

Technical Context

This MCU implements the ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels. Its system architecture integrates a 24-bit SysTick timer for OS task scheduling and a dedicated Clock Supervisor (CSV) that monitors external clock stability using internal CR oscillators to trigger reset on frequency anomaly or stop.

The peripheral set includes one CAN channel compliant with ISO 11898-1:2003, four multi-function serial interfaces configurable as UART/CSIO/LIN/I²C, and a base timer subsystem offering 16-/32-bit reload, PWM, PPG, and PWC modes - enabling precise waveform generation and motor phase control without external logic.

Key Specifications

Pinout & Package

The CY9AF421LWQN-G-JNE2 is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are fully relocatable via register configuration, supporting flexible PCB layout and peripheral multiplexing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit ARM Cortex-M3 microcontroller applications.

Compared with STM32F103C8T6 and RA4M1, the CY9AF421LWQN-G-JNE2 uniquely combines CAN 2.0B with hardware clock supervision, IGBT-mode PWM, and RTC calendar in a 64-pin LQFP - making it optimal for cost-constrained industrial motor and body electronics where timing integrity and bus reliability are design-critical.

Availability

CY9AF421LWQN-G-JNE2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and factory automation I/O modules requiring stable component supply across extended product lifecycles.

Supply support for CY9AF421LWQN-G-JNE2 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 global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive MCUs, and security solutions.

This device belongs to the FM3 family of 32-bit microcontrollers, designed specifically for embedded industrial and automotive applications demanding real-time performance, functional safety features, and mixed-signal integration in cost-sensitive designs.

FAQ

What is the maximum operating frequency and core revision of the CY9AF421LWQN-G-JNE2?

The CY9AF421LWQN-G-JNE2 uses the ARM Cortex-M3 processor core revision r2p1 and operates at a maximum frequency of 40 MHz. This frequency is achievable using the main PLL with either an external 4–48 MHz crystal or the internal 4 MHz CR oscillator as the input source. The core delivers deterministic interrupt latency and supports Thumb-2 instruction execution for efficient code density.

Does this MCU support CAN FD or only classical CAN 2.0?

The CY9AF421LWQN-G-JNE2 supports only classical CAN 2.0A/B (ISO 11898-1:2003), with a maximum bit rate of 1 Mbps and 32 message buffers. It does not implement CAN FD features such as flexible data-rate, larger payload size, or CRC enhancements. For CAN FD requirements, designers should consider Infineon's newer TRAVEO™ or XMC™ families.

How many general-purpose I/O pins are available, and are any 5V tolerant?

The CY9AF421LWQN-G-JNE2 provides up to 51 high-speed general-purpose I/O pins in its 64-pin LQFP package. Specific pins-including PA0–PA7, PB0–PB7, and PC0–PC7-are explicitly rated as 5V tolerant per the datasheet's "I/O Circuit Type" table. This allows direct interfacing with 5 V sensors, actuators, or legacy logic without level-shifting circuitry.

What low-power modes are supported, and what is the lowest typical current draw?

The MCU supports four low-power modes: Sleep, Timer, RTC, and Stop. In RTC mode, the device maintains calendar functionality while drawing less than 1.5 μA (typical) from VCC, powered solely by the 32.768 kHz RTC crystal. The Stop mode disables all clocks except the RTC oscillator and achieves sub-μA retention, but requires external reset or RTC alarm to wake.