FX2LP

FX2LP is a USB 2.0 peripheral controller developed by Cypress Semiconductor (now part of Infineon) as the low‑power variant of the EZ-USB FX2 family. It is designed to be the central controller in USB devices, handling the USB protocol while exposing a general-purpose CPU and data I/O that a designer can use to implement custom functionality. The device is a single integrated chip that includes an 8051‑family microcontroller core, a USB 2.0 full‑speed transceiver, memory resources, and general-purpose I/O.

Architecturally, FX2LP provides a programmable environment in which firmware runs on the on‑chip microcontroller. It supports a Slave FIFO interface, enabling high‑throughput data transfers between the USB host and external memory or I/O blocks connected to the device. This makes it suitable for data acquisition, streaming sensors, and other data-intensive USB peripherals. The device can operate in full‑speed or low‑speed USB modes and can be powered from the USB bus or from an external supply, depending on the board design.

Development and deployment typically involve writing firmware for the on‑chip 8051 core using common toolchains, configuring endpoints and FIFOs, and using Cypress-provided drivers and libraries (such as CyUSB) on the host side. Cypress also supplied development kits and sample firmware to illustrate how to implement standard USB classes or custom protocols.

FX2LP is part of the EZ‑USB family and was commonly used for custom USB peripherals before newer generations, such as FX3, broadened USB feature sets and performance. See also EZ‑USB FX2, FX3.