Infineon Technologies CY9BF121KQN-G-AVE2

Overview

CY9BF121KQN-G-AVE2 from Infineon Technologies (formerly Cypress) is a 32-bit Arm® Cortex®-M3 microcontroller with 256 KB dual-bank Flash, 32 KB SRAM, and integrated peripherals including 2×12-bit ADCs (0.8 μs conversion), 2×10-bit DACs, 8-channel DMA, LIN/UART/I²C/CSIO serial interfaces, and RTC. It operates up to 72 MHz at 2.7–5.5 V and supports six low-power modes for embedded motor control and industrial sensing applications.

For engineers reviewing the CY9BF121KQN-G-AVE2 datasheet, CY9BF121KQN-G-AVE2 pinout, CY9BF121KQN-G-AVE2 application, or CY9BF121KQN-G-AVE2 equivalent, key selection criteria include dual-bank Flash execution capability, 23-channel external interrupt support, 5 V-tolerant I/O on selected pins, and hardware CRC acceleration for CCITT CRC16 and IEEE-802.3 CRC32.

Technical Context

The CY9BF121KQN-G-AVE2 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 memory subsystem includes dual-bank Flash enabling concurrent read-while-write operations and two independent SRAM banks (SRAM0 on I/D bus, SRAM1 on system bus) for deterministic real-time data access.

Peripheral architecture features eight base timers (configurable as PWM/PPG/reload/PWC), two QPRC units for encoder position tracking, and a multi-function serial interface with per-channel mode selection (UART/CSIO/LIN/I²C). Clock supervision uses built-in CR oscillators to monitor external clock integrity via Clock Super Visor (CSV), triggering reset or interrupt on failure.

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 32-bit Arm Cortex-M3 microcontroller applications.

Compared with STM32F103VCT6 and RA4M1, the CY9BF121KQN-G-AVE2 uniquely combines dual-bank Flash, hardware LIN, QPRC, and Clock Super Visor-making it optimal for safety-critical, update-capable automotive and industrial motion systems where timing integrity and field firmware agility are non-negotiable.

Availability

CY9BF121KQN-G-AVE2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart sensor hubs, and energy monitoring gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CY9BF121KQN-G-AVE2 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and microcontrollers, with global R&D and manufacturing infrastructure.

The CY9BF121KQN-G-AVE2 belongs to the FM3 family of 32-bit Arm Cortex-M3 microcontrollers, designed specifically for cost-optimized, low-power embedded control in automotive body electronics and industrial automation where functional safety and field-upgradability are critical.

FAQ

What is the maximum operating frequency and supported voltage range?

The CY9BF121KQN-G-AVE2 operates at up to 72 MHz with a supply voltage range of 2.7 V to 5.5 V. This wide voltage range enables direct compatibility with both legacy 5 V systems and modern low-voltage sensors, while the 72 MHz clock supports real-time control loops with sub-10 μs latency for motor and power conversion applications.

Does this MCU support concurrent Flash read-while-write operations?

Yes - its dual-bank Flash architecture (240 KB upper + 16 KB lower) allows simultaneous execution from one bank while erasing or programming the other. This enables zero-downtime firmware updates in field-deployed equipment, a requirement for automotive ECUs and industrial controllers subject to OTA update mandates.

How many analog-to-digital converter channels does it provide, and what is their speed?

It integrates two independent 12-bit successive approximation ADCs supporting up to 26 input channels total. Each ADC achieves 0.8 μs conversion time at 5 V supply, enabling high-fidelity sampling of fast-changing signals such as phase currents in motor drives or transient voltage events in power quality monitors.

Is hardware LIN protocol support included, and which revision is implemented?

Yes - the MCU includes dedicated LIN hardware supporting ISO 17987-2:2016 (LIN Protocol Specification Rev. 2.1). It provides full master/slave operation, programmable break field length (13–16 bits), and automatic error detection (parity, framing, overrun), eliminating software overhead and ensuring deterministic timing for automotive body network compliance.