NXP Semiconductors LPC11U35FBD48/401,

Overview

LPC11U35FBD48/401 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in LQFP48 package, operating at up to 50 MHz with 64 kB flash, 10 kB total SRAM (8 kB + 2 kB USB), and 4 kB EEPROM. It integrates USB 2.0 full-speed device controller, USART with RS-485/smart card support, two SSP interfaces, I²C-bus (Fast-mode Plus), 10-bit ADC (8 channels), and 40 GPIO pins - deployed in USB audio devices and handheld scanners.

For engineers reviewing the LPC11U35FBD48/401 datasheet, LPC11U35FBD48/401 pinout, LPC11U35FBD48/401 application, or LPC11U35FBD48/401 equivalent, key selection criteria include USB device stack readiness, on-chip EEPROM byte-programmability, fractional baud rate generation for robust serial communication, and deep power-down wake-up via dedicated WAKEUP pin.

Technical Context

The LPC11U35FBD48/401 implements an ARM Cortex-M0 core with NVIC and system tick timer, paired with a dedicated USB PLL and main PLL for independent clock domain management. Its memory subsystem includes separate SRAM banks (SRAM0 and USB SRAM) enabling concurrent CPU and USB DMA operations without contention.

Peripheral routing is managed through programmable IOCON registers supporting pull-up/pull-down, repeater, and open-drain modes on all GPIOs. The USART supports asynchronous, synchronous, and ISO 7816-3 smart card modes with full modem handshake (CTS/RTS/DTR/DSR/DCD/RI), while the I²C-bus interface achieves 1 Mbit/s Fast-mode Plus operation with multi-address recognition.

Key Specifications

Pinout & Package

Package: LQFP48, plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm (SOT313-2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC11U34FBD48/421, the LPC11U35FBD48/401 offers 16 kB more flash for enhanced USB descriptor flexibility and bootloader customization, while LPC11U36FBD48/401 provides 32 kB additional flash for complex audio class stacks - all share identical USB timing, ADC performance, and low-power behavior.

Availability

LPC11U35FBD48/401 is available at Aetrix Electronics and suitable for USB audio devices, handheld scanners, and medical sensors requiring stable component supply, long-term manufacturability, and consistent parametric performance across production batches.

Supply support for LPC11U35FBD48/401 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 company 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 requiring low power, small footprint, and rapid time-to-market - emphasizing integrated USB device functionality and robust mixed-signal peripheral integration.

FAQ

What is the maximum operating frequency of the LPC11U35FBD48/401?

The LPC11U35FBD48/401 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 oscillator (1–25 MHz) with PLL. This frequency is fully supported across the specified industrial temperature range (−40 °C to +85 °C) and 1.8 V–3.6 V supply voltage.

Does the LPC11U35FBD48/401 include on-chip EEPROM, and what are its programming characteristics?

Yes, the LPC11U35FBD48/401 integrates 4 kB of on-chip EEPROM that is byte-erasable and byte-programmable. It includes on-chip API support for reliable write/erase operations, eliminating the need for external non-volatile memory in applications requiring infrequent parameter storage - such as calibration data, device serial numbers, or user preferences in the LPC11U35FBD48/401.

How does the USB interface of the LPC11U35FBD48/401 differ from standard USB microcontrollers?

The LPC11U35FBD48/401 features a full-speed USB 2.0 device controller with ROM-resident drivers, enabling immediate USB enumeration without consuming flash memory for stack code. It supports SoftConnect via the USB_CONNECT pin and includes dedicated USB PLL for stable 48 MHz clock generation - critical for jitter-sensitive applications like USB audio streaming on the LPC11U35FBD48/401.

Which power-saving modes are supported by the LPC11U35FBD48/401, and how is wake-up managed?

The LPC11U35FBD48/401 supports four reduced-power modes: Sleep, Deep-sleep, Power-down, and Deep power-down. Wake-up from Deep-sleep and Power-down is possible via reset, selectable GPIO pins, watchdog interrupt, or USB activity. For Deep power-down, only the dedicated WAKEUP pin (PIO0_16) can initiate wake-up - requiring an externally pulled HIGH state before entry and a LOW pulse to exit, ensuring ultra-low leakage current.

Can the LPC11U35FBD48/401's USART support RS-485 communication, and what hardware features enable it?

Yes, the LPC11U35FBD48/401's USART supports RS-485/EIA-485 operation in half-duplex mode with automatic driver enable control. It provides full modem handshake signals (RTS/CTS/DTR/DSR/DCD/RI) and 9-bit addressing mode - allowing direct connection to RS-485 transceivers without external logic. The USART's fractional baud rate generator ensures accurate timing across varying bus conditions, making it suitable for industrial networks interfacing with the LPC11U35FBD48/401.