Infineon Technologies CY9AFB42MBBGL-GK9E1

Overview

CY9AFB42MBBGL-GK9E1 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 256 KB dual-bank Flash, 32 KB SRAM, USB 2.0 Full-Speed device/host interface, 12-bit ADC (24 channels), and LCD controller (40×8). It operates up to 40 MHz, supports six low-power modes, and targets embedded control in industrial HMI, metering, and appliance interfaces.

For engineers reviewing the CY9AFB42MBBGL-GK9E1 datasheet, CY9AFB42MBBGL-GK9E1 pinout, CY9AFB42MBBGL-GK9E1 application, or CY9AFB42MBBGL-GK9E1 equivalent, key selection criteria include dual-bank Flash for seamless firmware updates, integrated LCDC with internal bias resistors, USB host/device dual-role capability, and 5 V-tolerant GPIOs on selected pins per package assignment.

Technical Context

This MCU implements the ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels. Its memory subsystem includes two independent SRAM banks (SRAM0/SRAM1) connected to I-code/D-code and system buses respectively, enabling concurrent CPU and DMA access without contention.

The peripheral set integrates a 2-channel watchdog (hardware + software), CRC accelerator for CCITT CRC16 and IEEE-802.3 CRC32, HDMI-CEC/remote receiver (2 channels), and real-time clock with leap-year support. Clock supervision uses built-in CR oscillators to monitor external clock integrity via Clock Super Visor (CSV).

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 microcontroller applications.

Compared with STM32F103VET6 and RA4M1, CY9AFB42MBBGL-GK9E1 uniquely integrates LCDC, USB device/host, and dual-bank Flash in a single 100-pin LQFP - reducing component count and PCB area for cost-sensitive HMI and metering designs.

Availability

CY9AFB42MBBGL-GK9E1 is available at Aetrix Electronics and suitable for industrial HMI panels, smart energy meters, home appliance control systems, and USB-capable diagnostic tools requiring stable component supply over extended production lifecycles.

Supply support for CY9AFB42MBBGL-GK9E1 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 MCUs, and security solutions, with global R&D and manufacturing infrastructure.

This part belongs to the FM3 family of 32-bit ARM Cortex-M3 microcontrollers, designed specifically for cost-optimized, low-power embedded control applications requiring integrated analog peripherals, human-machine interface support, and robust field-upgrade capability.

FAQ

Does CY9AFB42MBBGL-GK9E1 support USB host functionality without external components?

Yes. The MCU integrates a full-speed USB 2.0 host controller with built-in PLL and transceiver. Only standard 27 Ω series resistors on USB_DP/USB_DM and proper ESD protection are required - no external PHY or hub IC is needed for basic USB host operations such as HID or mass storage enumeration.

What is the maximum operating frequency when using the internal high-speed CR oscillator?

The internal high-speed CR oscillator runs at 4 MHz and is not intended as a primary system clock source. For 40 MHz operation, an external crystal (4–48 MHz) must be used with the main PLL. The CR oscillator serves mainly for clock supervision, watchdog timing, and low-power wake-up sources.

Can the LCD controller drive a 40×8 segment display without external bias circuitry?

Yes. The LCDC includes an internal resistor ladder for generating VV0–VV4 bias voltages. When configured in 8-COM mode, it directly supplies the required LCD bias without external components - confirmed in Section 13.4 "LCD Characteristics" of the official datasheet (002-05631 Rev. *D).

Is the 5 V tolerance on GPIO pins applicable to all ports?

No. Only specific pins - namely those in Port 0 (P00–P07) and Port 1 (P10–P17) - are rated for 5 V tolerance. All other GPIOs operate strictly within the VCC range (1.65–3.6 V). Pin-specific voltage ratings are defined in Table 4.2 "List of Pin Functions" and Figure 4.1 "Pin Assignment" of the datasheet.