Infineon Technologies CY9BF121LPMC-GNE2

Overview

CY9BF121LPMC-GNE2 from Infineon Technologies (formerly Cypress) is a 32-bit Arm® Cortex®-M3 microcontroller with dual-bank flash (256 KB), 32 KB on-chip SRAM (16 KB SRAM0 + 16 KB SRAM1), and integrated peripherals including 26-channel 12-bit ADC, dual 10-bit DAC, eight UART/CSIO/I²C/LIN serial interfaces, and hardware CRC accelerator. It operates up to 72 MHz at 2.7–5.5 V and supports six low-power modes - used in industrial motor control, automotive body electronics, and smart sensor nodes.

For engineers reviewing the CY9BF121LPMC-GNE2 datasheet, CY9BF121LPMC-GNE2 pinout, CY9BF121LPMC-GNE2 application, or CY9BF121LPMC-GNE2 equivalent, key selection criteria include dual-operation flash architecture for seamless firmware updates, LIN 2.1 compliance for automotive sub-systems, 16-bit QPRC for encoder-based position sensing, and SWJ-DP debug interface for real-time embedded development.

Technical Context

The CY9BF121LPMC-GNE2 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 scheduling. Its memory subsystem features dual-bank Flash enabling concurrent read-while-write operations across upper (240 KB) and lower (16 KB main + 32 KB work) banks, and two independent SRAM blocks (SRAM0 on I/D bus, SRAM1 on system bus).

Peripheral integration includes eight-channel DMA with 32-bit addressing and burst/demand transfer modes; multi-function serial interfaces configurable per channel as UART, CSIO, LIN, or I²C; and dedicated motor-control timers with dead-time insertion, DTIF interrupt, and waveform generation - all synchronized to the same clock domain for deterministic timing.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 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 microcontroller applications.

Compared with STM32F103VCT6 and RA4M1, CY9BF121LPMC-GNE2 uniquely combines LIN 2.1, dual-bank Flash, and QPRC in a single 80-pin LQFP package - making it optimal for cost-constrained, safety-aware automotive and industrial motion control where protocol fidelity and field-upgrade reliability are mandatory.

Availability

CY9BF121LPMC-GNE2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart sensor nodes, and energy monitoring systems requiring stable component supply across extended product lifecycles.

Supply support for CY9BF121LPMC-GNE2 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 - acquired Cypress Semiconductor in 2020 to expand its microcontroller and connectivity portfolio.

CY9BF121LPMC-GNE2 belongs to the FM3 family of 32-bit Arm Cortex-M3 microcontrollers designed specifically for cost-sensitive, low-power embedded control applications demanding high peripheral integration and automotive-grade reliability.

FAQ

Does CY9BF121LPMC-GNE2 support in-circuit debugging via SWD?

Yes. The device integrates a Serial Wire JTAG Debug Port (SWJ-DP) with SWDIO and SWCLK pins, enabling full real-time debugging, flash programming, and register inspection without halting system operation. No external debug adapter beyond standard SWD probes (e.g., Segger J-Link) is required.

What is the maximum operating frequency of the internal PLL?

The main PLL supports output frequencies up to 72 MHz when driven by either the 4–48 MHz external crystal or the 4 MHz built-in high-speed CR oscillator. PLL lock time is specified at ≤100 µs, and frequency stability is maintained across –40°C to +105°C ambient temperature range.

Can the dual-bank Flash be used for secure firmware rollback?

Yes. The dual-bank architecture allows one bank to hold the active firmware image while the other stores a validated backup. Upon failed update or checksum mismatch, the boot loader can redirect execution to the known-good bank - implemented entirely in hardware without external supervision.

Is the 32.768 kHz sub-clock source required for RTC operation?

Yes. The RTC block requires the 32.768 kHz sub-clock (from external crystal or internal oscillator) to maintain accurate timekeeping. In Deep Standby RTC mode, this clock remains active and powers the RTC counter and alarm registers even when the main CPU and most peripherals are powered down.