NXP Semiconductors LPC11U37FBD48/40EL

Overview

LPC11U37FBD48/40EL from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in LQFP48 package, operating up to 50 MHz with 128 kB flash, 10 kB SRAM (8 kB + 2 kB USB RAM), 4 kB EEPROM, full-speed USB 2.0 device controller, and USART supporting RS-485/smart card modes - deployed in USB audio devices and handheld scanners.

For engineers reviewing the LPC11U37FBD48/40EL datasheet, LPC11U37FBD48/40EL pinout, LPC11U37FBD48/40EL application, or LPC11U37FBD48/40EL equivalent, key selection criteria include USB device stack support in ROM, 4 kB byte-erasable EEPROM, 50 MHz CPU clock with dual PLL (system + USB), 10-bit 8-channel ADC, and 40 GPIO pins with configurable pull-up/pull-down and interrupt capability.

Technical Context

The LPC11U37FBD48/40EL integrates an ARM Cortex-M0 core with NVIC and NMI support, coupled with a dedicated USB PLL enabling independent 48 MHz USB clock generation while the system PLL drives the 50 MHz CPU. Its memory subsystem includes 128 kB flash with sector/page erase, 4 kB EEPROM with on-chip API, and 10 kB SRAM split as 8 kB general-purpose + 2 kB USB-dedicated RAM.

Peripheral architecture features one USART with fractional baud rate generator, FIFO, modem control, and ISO 7816-3 smart card interface; two SSP controllers; Fast-mode Plus I²C-bus (1 Mbit/s); four timers (two 32-bit, two 16-bit) with match/capture; and a 10-bit ADC with eight input channels - all accessible via 40 GPIO pins in LQFP48 package.

Key Specifications

Pinout & Package

LQFP48 package (SOT313-2), 7 × 7 × 1.4 mm body, 48 leads, lead pitch 0.5 mm - compatible with standard PCB assembly processes and cost-effective for mid-volume consumer and industrial designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with LPC11U37FBD64/50EL, the LPC11U37FBD48/40EL offers identical core performance and USB functionality in a smaller footprint but trades 14 GPIO and 2 kB SRAM for compactness; versus LPC11U36FBD48/401, it adds 32 kB flash headroom for feature-rich firmware or field upgrades without changing PCB.

Availability

LPC11U37FBD48/40EL is available at Aetrix Electronics and suitable for USB audio devices, handheld scanners, and industrial control systems requiring stable component supply, long-term manufacturability, and NXP's industrial-grade qualification.

Supply support for LPC11U37FBD48/40EL 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

NXP Semiconductors is a global semiconductor leader headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The LPC11U3x product line targets cost-sensitive, USB-connected embedded applications - delivering ARM Cortex-M0 performance with integrated USB device stack, EEPROM, and low-power operation for consumer and industrial peripherals.

FAQ

What is the maximum operating frequency of the LPC11U37FBD48/40EL?

The LPC11U37FBD48/40EL operates at a maximum CPU frequency of 50 MHz, achieved using either the internal 12 MHz IRC oscillator with PLL multiplication or an external crystal (1–25 MHz) with PLL. This frequency is sustained across the full industrial temperature range (−40 °C to +85 °C) and 1.8–3.6 V supply range, ensuring deterministic real-time execution for time-critical tasks.

Does the LPC11U37FBD48/40EL include on-chip USB firmware?

Yes, the LPC11U37FBD48/40EL includes ROM-resident USB device drivers supporting CDC, HID, and audio classes. These drivers eliminate the need to implement or certify a USB stack, reduce flash usage by over 8 kB, and enable reliable enumeration on Windows, macOS, and Linux hosts without custom INF files.

How much EEPROM does the LPC11U37FBD48/40EL provide, and what are its write characteristics?

The LPC11U37FBD48/40EL integrates 4 kB of on-chip EEPROM that is byte-erasable and byte-programmable, with on-chip API support for wear leveling and atomic updates. It withstands ≥100,000 erase/write cycles and retains data for ≥10 years at 85 °C - ideal for storing calibration coefficients, device IDs, or user settings without external NV memory.

Which packages are available for the LPC11U37FBD48/40EL?

The LPC11U37FBD48/40EL is exclusively offered in the LQFP48 package (SOT313-2), measuring 7 × 7 × 1.4 mm with 0.5 mm lead pitch. This package provides 40 GPIO pins and matches the pinout of other LPC11U3x LQFP48 variants (e.g., LPC11U36FBD48/401), enabling drop-in compatibility within the same footprint family.

Does the LPC11U37FBD48/40EL support smart card interfaces?

Yes, the LPC11U37FBD48/40EL's USART supports ISO/IEC 7816-3 asynchronous smart card mode, including automatic guard time insertion, character parity checking, and clock output control. This capability enables direct integration into secure access readers, payment terminals, or ID verification systems without external protocol converters.