Infineon Technologies CY9AF311KQN-G-AVE2

Overview

CY9AF311KQN-G-AVE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 128 KB MainFlash, 32 KB WorkFlash, 16 KB SRAM (8 KB SRAM0 + 8 KB SRAM1), USB 2.0 Full-Speed device/host interface, and integrated motor control peripherals including 8-channel 12-bit ADC (1.0 μs conversion @5 V), QPRC, and multi-function timers. It targets embedded motor control and industrial automation systems requiring real-time responsiveness and low-power operation.

For engineers reviewing the CY9AF311KQN-G-AVE2 datasheet, CY9AF311KQN-G-AVE2 pinout, CY9AF311KQN-G-AVE2 application, or CY9AF311KQN-G-AVE2 equivalent, key selection criteria include USB dual-role capability, 40 MHz max CPU frequency, dual Flash security partitioning, RTC with leap-year support, and 5V-tolerant GPIO for industrial I/O interfacing.

Technical Context

The CY9AF311KQN-G-AVE2 implements the 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 two independent Flash banks (MainFlash and WorkFlash) with zero-wait-state access and shared code protection, and dual-bus-connected SRAM (SRAM0 on I/D-code bus, SRAM1 on system bus) enabling concurrent CPU and DMA access.

Peripherals are architected for deterministic motor control: Base Timers support PWM/PPG/PWC modes; Multi-function Timer provides input capture, output compare, A/D activation, and dead-time insertion; QPRC offers 16-bit position/revolution counting with configurable A/B/Z edge detection; and dual watchdogs (hardware clocked by 100 kHz CR oscillator, software-controlled) ensure fail-safe operation across six low-power modes including Deep stand-by RTC.

Key Specifications

Pinout & Package

Package: QFN-64 (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F303K8T6 and RA4M2A20GBM#AC0, the CY9AF311KQN-G-AVE2 uniquely integrates QPRC hardware, dual Flash security partitioning, and USB host/device in a single 64-pin QFN package-making it optimal for cost-sensitive, space-constrained motor control and industrial gateway designs requiring deterministic encoder handling and field-upgradable firmware.

Availability

CY9AF311KQN-G-AVE2 is available at Aetrix Electronics and suitable for industrial motor drive, smart energy metering, programmable logic controller (PLC) I/O modules, and factory automation gateways requiring stable component supply and long-term lifecycle support.

Supply support for CY9AF311KQN-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 is a German semiconductor manufacturer specializing in power management, automotive, industrial, and embedded solutions, with global R&D and manufacturing infrastructure.

The CY9AF311KQN-G-AVE2 belongs to the FM3 family of 32-bit ARM Cortex-M3 microcontrollers, designed specifically for cost-effective, real-time industrial control applications requiring integrated motor control peripherals, USB connectivity, and robust low-power operation.

FAQ

What is the maximum operating frequency and supported clock sources for CY9AF311KQN-G-AVE2?

The CY9AF311KQN-G-AVE2 operates at up to 40 MHz using its ARM Cortex-M3 core. Clock sources include an external 4–48 MHz crystal (XTAL/EXTAL), 32.768 kHz sub-clock, 4 MHz high-speed internal CR oscillator, 100 kHz low-speed internal CR oscillator, and a main PLL that multiplies the main clock to generate USB timing. All sources are dynamically selectable via software registers.

Does CY9AF311KQN-G-AVE2 support USB host functionality, and what peripheral devices can it enumerate?

Yes, it supports USB 2.0 Full-Speed and Low-Speed host mode with automatic device connect/disconnect detection, IN/OUT token handshake, and up to 256-byte packet length. It can enumerate standard USB class devices including HID keyboards/mice, CDC ACM modems, mass storage devices (flash drives), and custom vendor-class peripherals-without requiring external USB hub or PHY components.

How does the dual Flash architecture (MainFlash and WorkFlash) enhance firmware security and update reliability?

MainFlash (128 KB) stores primary application code with read-out protection, while WorkFlash (32 KB) holds configuration parameters, calibration data, and firmware patches. Both share the same security function, enabling secure over-the-air updates: new firmware is written to WorkFlash, validated via CRC, then atomically swapped into MainFlash-preventing bricking during power loss or corruption.

Which pins support 5V tolerance, and how is this verified in the electrical specifications?

Pins PA0 through PA7 are explicitly specified as 5V tolerant in the "I/O Circuit Type" section (page 21) and confirmed in Absolute Maximum Ratings (page 42): VIH(max) = 5.5 V and VIL(min) = –0.5 V for these pins. This allows direct interfacing with legacy 5V logic, industrial sensors, and optocoupler outputs without level-shifting circuitry.