Infineon Technologies CY9AF421LPMC-G-JNE2

Overview

CY9AF421LPMC-G-JNE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 64 KB Flash, 4 KB SRAM, 40 MHz max CPU frequency, CAN 2.0A/B interface (1 Mbps), and 12-bit ADC (0.8 μs conversion). It targets embedded motor control and industrial automation systems requiring integrated timing, analog sensing, and robust serial communication.

For engineers reviewing the CY9AF421LPMC-G-JNE2 datasheet, CY9AF421LPMC-G-JNE2 pinout, CY9AF421LPMC-G-JNE2 application, or CY9AF421LPMC-G-JNE2 equivalent, key selection criteria include its dual watchdog timers (HW/SW), RTC with leap-year support, 51 GPIOs in 64-pin LQFP, 2.7–5.5 V supply range, and FM3 family peripheral compatibility for legacy migration paths.

Technical Context

The device implements an ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels, plus a 24-bit SysTick timer for RTOS integration. Its clock system combines five sources - including 4–48 MHz main oscillator, 32.768 kHz sub-clock, and dual CR oscillators - managed by Clock Supervisor (CSV) for external clock failure detection.

Peripheral architecture includes one CAN channel with 32 message buffers, four multi-function serial interfaces configurable as UART/CSIO/LIN/I²C, eight-channel 12-bit ADC with scan/priority modes and FIFO, and a 10-bit R-2R DAC. Low-power operation spans Sleep, Timer, RTC, and Stop modes, with hardware watchdog active in all except RTC/Stop.

Key Specifications

Pinout & Package

This device is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad, suitable for surface-mount assembly and moderate-power embedded applications.

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, CY9AF421LPMC-G-JNE2 uniquely integrates CAN 2.0B, LIN 2.1, and CSIO in a single 64-pin LQFP package - making it the only option among the three that meets automotive body electronics and industrial CAN node requirements without external protocol ICs.

Availability

CY9AF421LPMC-G-JNE2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and factory automation I/O hubs requiring stable component supply and long-term lifecycle support.

Supply support for CY9AF421LPMC-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, and industrial control solutions with strong IP in embedded controllers and safety-critical systems.

This part belongs to the FM3 family of 32-bit microcontrollers designed specifically for cost-sensitive, low-power embedded applications demanding integrated analog peripherals, fieldbus connectivity (CAN/LIN), and robust real-time operation in harsh environments.

FAQ

What is the maximum operating frequency and core revision of CY9AF421LPMC-G-JNE2?

The CY9AF421LPMC-G-JNE2 operates at up to 40 MHz and implements the ARM Cortex-M3 processor revision r2p1. This core version includes the Nested Vectored Interrupt Controller (NVIC) with 48 peripheral interrupt lines and 16 priority levels, ensuring deterministic real-time response for time-critical embedded applications such as motor control and industrial automation.

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

CY9AF421LPMC-G-JNE2 supports only CAN Specification 2.0A/B (classical CAN) at up to 1 Mbps, with 32 built-in message buffers. It does not implement CAN FD features such as flexible data-rate or extended frame formats. For CAN FD applications, designers must select newer Infineon families like the XMC4000 or AURIX™ TC3xx series.

How many ADC channels and what resolution does the integrated analog-to-digital converter offer?

The device integrates an 8-channel, 12-bit successive approximation register (SAR) ADC with 0.8 μs conversion time at 5 V supply. It supports scanning mode with 16-step FIFO and priority-based conversion with 4-step FIFO, enabling simultaneous sampling of multiple sensors while maintaining timing predictability in closed-loop control systems.

Is the CY9AF421LPMC-G-JNE2 pin-compatible with other FM3 series MCUs?

Yes - CY9AF421LPMC-G-JNE2 uses the 64-pin LQFP package shared across multiple CY9A420L-series variants. Pin functions align with the FM3 Peripheral Manual TYPE11 configuration, allowing direct replacement with other members like CY9A422LPMC-G-JNE2 (128 KB Flash) or CY9A420LPMC-G-JNE2 (same Flash size, different peripheral enablement), provided software initialization matches the target variant's feature set.