Infineon Technologies CY9AF421LPMC1-G-JNE2

Overview

CY9AF421LPMC1-G-JNE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 64 KB on-chip Flash, 4 KB SRAM, 12-bit ADC (8 channels, 0.8 μs conversion), 10-bit DAC (1 channel), and integrated CAN 2.0A/B interface (1 Mbps). It operates up to 40 MHz, supports four low-power modes (Sleep, Timer, RTC, Stop), and targets embedded motor control and industrial sensing applications.

For engineers reviewing the CY9AF421LPMC1-G-JNE2 datasheet, CY9AF421LPMC1-G-JNE2 pinout, CY9AF421LPMC1-G-JNE2 application, or CY9AF421LPMC1-G-JNE2 equivalent, key selection criteria include its dual watchdog timers (hardware + software), 51 GPIOs in 64-pin LQFP package, RTC with leap-year support, and IGBT-mode PWM features for motor drive timing and dead-time control.

Technical Context

This MCU implements the ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels. Its clock system integrates five sources: 4–48 MHz main oscillator, 32.768 kHz sub-clock, 4 MHz/100 kHz built-in CR oscillators, and configurable Main PLL.

The peripheral set includes eight base timers (16-/32-bit reload/PWM/PPG/PWC), three multi-function timers with input capture/output compare/waveform generation, and a real-time clock with date/time interrupt masking down to minute granularity and continuous time update during register write.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (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, CY9AF421LPMC1-G-JNE2 uniquely combines CAN 2.0B, hardware RTC with leap-year logic, and IGBT-mode PWM in a single 64-pin LQFP package-making it optimal for space-constrained, fieldbus-connected motor controllers requiring long-term timekeeping and safety-critical timing.

Availability

CY9AF421LPMC1-G-JNE2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and PLC I/O modules requiring stable component supply and long lifecycle support.

Supply support for CY9AF421LPMC1-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 manufacturer specializing in power management, automotive ICs, and embedded controllers, with global manufacturing and R&D infrastructure.

This part belongs to the FM3 family of 32-bit microcontrollers designed specifically for cost-sensitive, low-power industrial and automotive embedded applications requiring integrated analog peripherals and fieldbus interfaces.

FAQ

What is the maximum operating frequency and core revision of CY9AF421LPMC1-G-JNE2?

The CY9AF421LPMC1-G-JNE2 operates at up to 40 MHz using the ARM Cortex-M3 processor core revision r2p1. This revision includes full NVIC support with 48 peripheral interrupts and 16 priority levels, enabling deterministic real-time response in motor control and industrial automation applications.

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

CY9AF421LPMC1-G-JNE2 supports only CAN Specification 2.0A/B (classical CAN) at up to 1 Mbps. It does not implement CAN FD features such as flexible data-rate or extended data length. The built-in CAN controller includes 32 message buffers and full compatibility with legacy CAN networks used in industrial machinery and automotive subsystems.

How many GPIO pins are available, and which ones are 5V tolerant?

The device provides up to 51 high-speed general-purpose I/O ports in its 64-pin LQFP package. Specific pins designated as 5V tolerant are listed in the "List of Pin Functions and I/O Circuit Type" section of the datasheet (Document No. 002-05659 Rev. *D, pages 12–22); these include selected PA, PB, and PC port pins configured for 5V input tolerance when VCC ≥ 3.0 V.

Is the RTC battery-backed, and what happens to timekeeping in Stop mode?

The RTC operates from the 32.768 kHz sub-clock oscillator and continues counting in Stop mode when powered by VCC alone; no separate VBAT rail is required. Timekeeping remains active with full calendar functionality-including leap-year calculation-as long as the RTCXIN/RTCXOUT crystal is connected and VCC is maintained above the minimum operating voltage (2.7 V).