Infineon Technologies CY9AFA41NBBGL-GE1

Overview

CY9AFA41NBBGL-GE1 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 256 KB dual-bank Flash (240 KB upper + 16 KB lower), 32 KB on-chip SRAM (16 KB SRAM0 + 16 KB SRAM1), and integrated LCD controller supporting up to 40×8 SEG/COM for embedded HMI applications. It operates at up to 40 MHz, supports six low-power modes including Deep Standby RTC, and includes hardware flow control on UART ch.4.

For engineers reviewing the CY9AFA41NBBGL-GE1 datasheet, CY9AFA41NBBGL-GE1 pinout, CY9AFA41NBBGL-GE1 application, or CY9AFA41NBBGL-GE1 equivalent, key selection criteria include dual-bank Flash concurrent read/erase capability, 24-channel 12-bit ADC with 2.0 µs conversion time, HDMI-CEC/remote receiver support, CRC16/CRC32 acceleration, and 83 GPIOs in 100-pin LQFP package with 5 V-tolerant pins.

Technical Context

This MCU 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 background programming and independent SRAM banks (SRAM0 on I/D-code bus, SRAM1 on system bus) for deterministic real-time execution.

The peripheral set includes an 8-channel DMA controller with 32-bit addressing, LCDC with internal bias resistors and blinking function, and multi-function serial interfaces (UART/CSIO/I²C) across eight channels - four with 16×9-bit FIFO (ch.4–7) and four without (ch.0–3). Hardware flow control (CTS/RTS) is implemented only on UART channel 4.

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 RP2040, CY9AFA41NBBGL-GE1 delivers unique integration of hardware-accelerated HDMI-CEC, 40×8 LCDC, and dual-bank Flash - reducing BOM, firmware complexity, and qualification effort for remote control and industrial HMI applications.

Availability

CY9AFA41NBBGL-GE1 is available at Aetrix Electronics and suitable for smart remote controls, industrial HMI panels, energy meter displays, and home appliance control boards requiring stable component supply, long-term lifecycle support, and qualified automotive/industrial grade silicon.

Supply support for CY9AFA41NBBGL-GE1 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 leader specializing in power management, automotive MCUs, and security solutions, with global manufacturing and R&D infrastructure.

The CY9AA40NB series belongs to Infineon's FM3 family of high-integration, low-power ARM Cortex-M3 microcontrollers - designed specifically for cost-sensitive, display-driven embedded applications in consumer electronics and industrial controls.

FAQ

What is the maximum operating frequency and supported clock sources for CY9AFA41NBBGL-GE1?

The device operates at up to 40 MHz using five selectable clock sources: two external oscillators (main clock 4–48 MHz, sub-clock 32.768 kHz), two built-in CR oscillators (4 MHz high-speed, 100 kHz low-speed), and a main PLL. The PLL can accept either the main clock or the 4 MHz CR oscillator as input, enabling flexible system clock derivation with jitter tolerance.

Does CY9AFA41NBBGL-GE1 support hardware flow control on all UART channels?

No - hardware flow control (CTS/RTS) is implemented exclusively on UART channel 4, as confirmed in the peripheral specification section of the datasheet. Channels 0–3 and 5–7 support standard UART functionality only, without automatic RTS assertion or CTS monitoring. This design reflects targeted use in primary communication links while conserving pin resources.

How does the dual-bank Flash architecture improve firmware update reliability?

The dual-bank Flash (240 KB upper + 16 KB lower) allows one bank to execute code while the other is erased or programmed - enabling true background updates. This eliminates system interruption during OTA patches and prevents corruption from power loss mid-write, as verified in the Flash memory operation timing diagrams and dual-operation sequence flowcharts.

Which pins are 5 V tolerant, and how is this validated?

Specific GPIO pins - including P00–P07, P10–P17, P20–P27, and P30–P37 - are rated 5 V tolerant when configured as inputs, as documented in Section 5 ("I/O Circuit Type") and Table 12.3.2 ("Pin Characteristics") of the datasheet. Tolerance is achieved via internal clamping diodes and verified under recommended operating conditions (VCC = 2.2–3.6 V, VIH ≤ 5.5 V).