Infineon Technologies CY9AF311NAPF-G-JNE1

Overview

CY9AF311NAPF-G-JNE1 from Infineon Technologies (formerly Cypress) is a 32-bit Arm® Cortex®-M3 microcontroller with 512 KB on-chip Flash, 32 KB SRAM (split into two 16 KB banks), USB 2.0 Full-Speed device/host interface, and integrated motor control peripherals including 8-channel base timers, QPRC, and multi-function timers. It operates up to 40 MHz, supports LIN 2.1, I²C, UART, CSIO, and runs on 2.7–5.5 V supply.

For engineers reviewing the CY9AF311NAPF-G-JNE1 datasheet, CY9AF311NAPF-G-JNE1 pinout, CY9AF311NAPF-G-JNE1 application, or CY9AF311NAPF-G-JNE1 equivalent, key selection criteria include USB dual-role capability, 16-channel 12-bit ADC with FIFO, hardware flow control on UART ch.4, external bus interface support, and dual watchdog timers with independent CR oscillators.

Technical Context

The CY9AF311NAPF-G-JNE1 implements a deterministic real-time execution environment via its Arm Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels. Its memory subsystem includes separate I-code/D-code and system buses enabling concurrent instruction fetch and data access across SRAM0 and SRAM1.

Peripheral integration targets embedded motor control: dual QPRC units decode quadrature encoder signals with 16-bit position/revolution counters; multi-function timers provide PWM, dead-time insertion, A/D activation triggers, and DTIF emergency stop interrupts; and the built-in USB PLL generates precise 48 MHz clock from main oscillator input.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 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, CY9AF311NAPF-G-JNE1 uniquely combines USB dual-role, LIN 2.1, QPRC, and external bus interface in a single 100-pin LQFP package - making it optimal for cost-sensitive, feature-rich industrial and automotive control nodes requiring field-upgradability and encoder-based motion control.

Availability

CY9AF311NAPF-G-JNE1 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, USB-capable gateways, and smart power metering requiring stable component supply and long-term lifecycle support.

Supply support for CY9AF311NAPF-G-JNE1 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 systems, sensors, and microcontrollers for automotive, industrial, and IoT applications.

This device belongs to the FM3 family of 32-bit Arm Cortex-M3 microcontrollers, designed specifically for high-performance, cost-sensitive embedded control applications requiring integrated motor control, communication, and USB connectivity.

FAQ

What is the maximum operating frequency and supported clock sources?

The CY9AF311NAPF-G-JNE1 operates up to 40 MHz using five selectable clock sources: external 4–48 MHz crystal (XTAL/EXTAL), 32.768 kHz sub-clock, built-in 4 MHz high-speed CR oscillator, 100 kHz low-speed CR oscillator, and main PLL derived from either external or internal clock inputs. The USB PLL is dedicated and independent.

Does this MCU support hardware flow control on UART interfaces?

Yes, hardware flow control (CTS/RTS) is supported on UART channel 4 only, as confirmed in the FM3 Peripheral Manual. Channels 0–3 and 5–7 do not implement RTS/CTS signaling; their serial communication relies on software handshaking or fixed baud rate synchronization.

What low-power modes are available and how do they differ?

The MCU supports three low-power modes: SLEEP (CPU halted, peripherals active), TIMER (CPU halted, watch counter running), and STOP (all clocks stopped except low-speed CR oscillator). STOP mode achieves sub-μA current draw and supports wake-up via external interrupt or watch counter timeout - critical for battery-operated sensor nodes.

Is the external bus interface available on all variants in the CY9A310A Series?

No. The external bus interface is excluded from CY9AF311LA, F312LA, and F314LA variants, as explicitly stated in the datasheet. CY9AF311NAPF-G-JNE1 retains full external bus support with 8 chip selects, 8/16-bit data width, and up to 256 MB address space - enabling direct NOR Flash or SRAM expansion.