Infineon Technologies CY9AF312NAPF-G-JNE1

Overview

CY9AF312NAPF-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, 2-unit QPRC, and multi-function serial interfaces supporting UART, CSIO, LIN 2.1, and I²C. It operates at up to 40 MHz and targets embedded motor control and industrial automation systems requiring real-time timing, analog sensing, and protocol flexibility.

For engineers reviewing the CY9AF312NAPF-G-JNE1 datasheet, CY9AF312NAPF-G-JNE1 pinout, CY9AF312NAPF-G-JNE1 application, or CY9AF312NAPF-G-JNE1 equivalent, key selection criteria include its dual-bank SRAM architecture for deterministic interrupt latency, built-in USB PLL eliminating external crystal dependency, 12-bit ADC with 1.0 µs conversion time at 5 V, and support for hardware flow control on UART channel 4 - critical for robust industrial serial communication.

Technical Context

The CY9AF312NAPF-G-JNE1 implements an Arm Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts across 16 priority levels and a 24-bit SysTick timer for RTOS scheduling. Its memory subsystem features zero-wait-state Flash execution and dual-bus-connected SRAM banks (SRAM0 on I/D-code bus, SRAM1 on system bus), enabling concurrent CPU and DMA access without contention.

Peripheral integration includes a dedicated USB PHY with internal PLL generating 48 MHz USB clock from main oscillator, eight-channel DMA controller with burst/block/demand transfer modes, three 12-bit successive-approximation ADC units (16-step FIFO for scan mode), and motor-specific blocks: quadrature encoder counters (QPRC), dead-time insertion (DTIF), and waveform generators with PWM/PPG/PWC modes - all synchronized to a common clock domain for deterministic timing.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the CY9A310A Series datasheet Rev. *F, Section 3 ("Pin Assignment") and Section 4 ("List of Pin Functions").

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit Arm Cortex-M3 microcontroller applications.

Compared with STM32F103VET6 and RA4M1, the CY9AF312NAPF-G-JNE1 delivers unique value in integrated motor control (QPRC + DTIF), dual-mode USB with on-die PLL, and hardware LIN 2.1 - reducing BOM cost, firmware development effort, and timing uncertainty in motion-critical applications.

Availability

CY9AF312NAPF-G-JNE1 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, PLC I/O expansion, and USB-capable industrial gateways requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.

Supply support for CY9AF312NAPF-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 management, automotive MCUs, and security solutions with vertical integration from silicon to system-level software.

The CY9AF312NAPF-G-JNE1 belongs to the FM3 family of 32-bit Arm Cortex-M3 microcontrollers, designed specifically for cost-sensitive, high-reliability embedded control applications demanding integrated motor control, industrial communication protocols, and low-power operation.

FAQ

What is the maximum operating frequency and supported voltage range?

The CY9AF312NAPF-G-JNE1 operates at up to 40 MHz with a core supply voltage (VCC) range of 2.7 V to 5.5 V. USB I/O requires a separate 3.0–3.6 V supply (USBVCC) when the USB interface is active; otherwise, USBVCC may be tied to VCC within the full 2.7–5.5 V range. These specifications are validated per datasheet Rev. *F Section 12.2.

Does this MCU support USB device and host modes simultaneously?

No - the CY9AF312NAPF-G-JNE1 supports USB device and host modes, but not concurrently. The USB controller operates in one mode at a time, selected at initialization via firmware configuration. Mode switching requires reinitialization of the USB module and is not runtime-switchable without resetting the USB subsystem.

How many independent ADC units are integrated, and what is their conversion speed?

This MCU integrates three independent 12-bit successive-approximation ADC units. Each achieves a conversion time of 1.0 µs at 5 V supply, with support for scanning mode (16-step FIFO) and priority-based conversion (4-step FIFO). Total analog input channels are 16, mapped to physical pins as defined in the "Pin Description" section of the datasheet.

Is hardware flow control available on all UART channels?

Hardware flow control (CTS/RTS) is supported only on UART channel 4, as explicitly stated in the datasheet Rev. *F page 2. Channels 0–3 and 5–7 do not implement RTS/CTS signaling; they rely on software handshaking or fixed baud rate timing. This limitation applies specifically to the CY9AF312NAPF-G-JNE1 variant within the CY9A310A Series.