NXP Semiconductors LPC11U35FBD48/40EL

Overview

LPC11U35FBD48/40EL 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 SRAM (8 kB + 2 kB USB), and 4 kB EEPROM. It integrates full-speed USB 2.0 device controller, USART with RS-485/smart card support, I²C-bus (Fast-mode Plus), two SSP interfaces, 10-bit ADC (8 channels), and 40 GPIO pins - deployed in USB audio devices and handheld scanners requiring embedded connectivity and low-power operation.

For engineers reviewing the LPC11U35FBD48/40EL datasheet, LPC11U35FBD48/40EL pinout, LPC11U35FBD48/40EL application, or LPC11U35FBD48/40EL equivalent, key selection criteria include USB device stack support in ROM, fractional baud rate generation for precise serial timing, on-chip EEPROM byte-programmability, 1.8–3.6 V single-supply operation, and wake-up capability from Deep-sleep mode via GPIO or USB activity.

Technical Context

The LPC11U35FBD48/40EL implements an ARM Cortex-M0 core with NVIC and system tick timer, paired with a dedicated USB PLL enabling independent 48 MHz USB clock generation while main CPU runs at up to 50 MHz from system oscillator or 12 MHz IRC. Its peripheral set includes dual SSP controllers with FIFOs, programmable Windowed Watchdog Timer with internal WDO, and four general-purpose timers (two 32-bit, two 16-bit) supporting capture/match functions across multiple pins.

Memory architecture features separate SRAM banks: 8 kB SRAM0 for general use, 2 kB USB SRAM for endpoint buffers, and 4 kB EEPROM with byte-level erase/program - all accessible via on-chip API. Power management includes four reduced-power modes (Sleep, Deep-sleep, Power-down, Deep power-down), with wake-up sources including reset, selectable GPIO, watchdog interrupt, and USB port activity.

Key Specifications

Pinout & Package

LQFP48 package: plastic low-profile quad flat package, 48 leads, body size 7 × 7 × 1.4 mm (SOT313-2). Pin 1 index located at top-left corner; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ARM Cortex-M0 microcontroller applications.

Compared with LPC11U34FBD48/421, the LPC11U35FBD48/40EL provides 16 kB more flash for enhanced feature sets without changing PCB layout; versus LPC11U36FBD48/401, it trades 32 kB flash for lower unit cost while retaining identical peripheral configuration and power profile.

Availability

LPC11U35FBD48/40EL is available at Aetrix Electronics and suitable for USB audio devices, handheld scanners, and medical sensors requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LPC11U35FBD48/40EL 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The LPC11U3x product line was designed specifically for cost-sensitive, USB-connected embedded systems requiring low power, small footprint, and integrated connectivity - targeting consumer peripherals, point-of-care medical devices, and industrial human-machine interfaces.

FAQ

What is the maximum operating frequency of the LPC11U35FBD48/40EL?

The LPC11U35FBD48/40EL operates at a maximum CPU frequency of 50 MHz, achievable using either the external crystal oscillator (1–25 MHz range) or the internal 12 MHz IRC with PLL multiplication. This frequency is sustained across the full industrial temperature range (−40 °C to +85 °C) and 1.8–3.6 V supply voltage.

Does the LPC11U35FBD48/40EL include on-chip EEPROM, and how is it accessed?

Yes, the LPC11U35FBD48/40EL integrates 4 kB of on-chip EEPROM that is byte-erasable and byte-programmable. Access is provided through an on-chip API located in boot ROM, callable via standard C functions - eliminating need for external EEPROM and simplifying data retention in applications like calibration storage or device configuration.

Can the LPC11U35FBD48/40EL support USB device functionality without external components?

Yes, the LPC11U35FBD48/40EL includes a full-speed USB 2.0 device controller with ROM-based drivers and dedicated 2 kB USB SRAM. Only passive components (27 Ω series resistors on DP/DM, 1.5 kΩ SoftConnect resistor controlled via PIO0_6/USB_CONNECT) are required - no external PHY or transceiver needed for basic HID, CDC, or MSC class operation.

How many ADC channels does the LPC11U35FBD48/40EL support, and what is the resolution?

The LPC11U35FBD48/40EL features a 10-bit successive approximation register (SAR) ADC with multiplexing across eight input pins (AD0–AD7). Conversion is software- or timer-triggered, with configurable sample time and reference selection (VDDA or internal 3.3 V reference), supporting analog sensor interfacing in medical and industrial applications.

What debug interfaces are supported by the LPC11U35FBD48/40EL?

The LPC11U35FBD48/40EL supports both Serial Wire Debug (SWD) and standard JTAG interfaces. SWD is selected by pulling RESET/PIO0_0 HIGH during reset; JTAG is selected by pulling it LOW. Both interfaces provide full read/write memory access, breakpoint setting, and real-time variable inspection via compatible debug probes (e.g., LPC-Link2, CMSIS-DAP).