Infineon Technologies CY9AF421KWQN-G-JNE2

Overview

CY9AF421KWQN-G-JNE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 64 KB on-chip Flash, 4 KB SRAM, 1 Mbps CAN interface, 12-bit ADC (0.8 μs conversion), and 10-bit DAC-designed for embedded motor control and industrial automation systems requiring real-time I/O, low-power operation, and integrated communication.

For engineers reviewing the CY9AF421KWQN-G-JNE2 datasheet, CY9AF421KWQN-G-JNE2 pinout, CY9AF421KWQN-G-JNE2 application, or CY9AF421KWQN-G-JNE2 equivalent, key selection factors include its 40 MHz max CPU frequency, dual watchdog timers (HW/SW), RTC with leap-year support, 51 GPIOs in 64-pin QFP, and FM3 family peripheral compatibility per TYPE11 classification.

Technical Context

This MCU implements the ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels, plus a 24-bit SysTick timer for OS task scheduling. It integrates dedicated hardware blocks including a CAN 2.0A/B controller with 32 message buffers, four configurable serial interfaces (UART/CSIO/LIN/I²C), and multi-function timers supporting PWM, PPG, and A/D activation compare.

The clock system supports five sources: 4–48 MHz main oscillator, 32.768 kHz sub-clock, 4 MHz and 100 kHz built-in CR oscillators, and a programmable Main PLL. Power management includes four low-power modes (Sleep, Timer, RTC, Stop), dual LVD stages (interrupt + reset), and Clock Supervision (CSV) for external clock failure detection.

Key Specifications

Pinout & Package

Package: 64-pin QFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

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 RP2040, CY9AF421KWQN-G-JNE2 uniquely combines CAN+LIN+RTC+IGBT control in one die, reducing system-level component count and timing jitter in motor and body electronics designs.

Availability

CY9AF421KWQN-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, long-term lifecycle support, and qualified automotive-grade qualification.

Supply support for CY9AF421KWQN-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 German semiconductor leader specializing in power management, automotive MCUs, and security solutions, with global manufacturing and R&D infrastructure.

This part belongs to the FM3 family of 32-bit microcontrollers, engineered specifically for cost-sensitive, low-power embedded control applications demanding integrated analog peripherals, real-time communication, and functional safety readiness.

FAQ

What is the maximum operating frequency and supported voltage range?

CY9AF421KWQN-G-JNE2 operates up to 40 MHz with a supply voltage range of 2.7 V to 5.5 V. Its DC characteristics are fully specified across this range, enabling direct interface with 3.3 V and 5 V logic families without level-shifting. The built-in 4 MHz and 100 kHz CR oscillators provide clock sources independent of external components, ensuring reliable startup and low-power mode operation.

Does this MCU support LIN 2.1 protocol natively?

Yes, the CY9AF421KWQN-G-JNE2 includes dedicated LIN hardware supporting LIN 2.1 specification, including programmable break field (13–16 bits) and delimiter (1–4 bits), master/slave mode, and full-duplex double-buffered communication. This eliminates software bit-banging overhead and guarantees timing compliance for automotive body control modules meeting ISO 17987-4 requirements.

How many CAN message buffers are implemented, and what is their allocation method?

The device implements 32 dedicated CAN message buffers, each configurable as transmit or receive with programmable ID masking and acceptance filtering. Buffers are managed via hardware FIFO and prioritized by ID or order of arrival. This architecture supports concurrent handling of multiple CAN IDs without CPU intervention, essential for multi-node diagnostics and gateway applications in automotive networks.

Is the 41-bit Unique ID accessible via standard debug interface or only through firmware?

The 41-bit Unique ID is stored in a dedicated ROM area and readable only via firmware using the provided system register interface (SYSCFG_UIDR). It is not exposed through SWD/JTAG debug access for security reasons. Applications must implement a bootloader or runtime routine to retrieve and use this value for device authentication, licensing, or secure firmware update binding.