NXP Semiconductors LPC11U68JBD64K

Overview

LPC11U68JBD64K from NXP Semiconductors is a 32-bit ARM Cortex-M0+ microcontroller operating at up to 50 MHz, featuring 256 KB flash, 36 KB SRAM, and 4 KB EEPROM. It integrates USB 2.0 full-speed device controller with on-chip PHY, dual I²C interfaces (one Fast-mode Plus), five USARTs, 12-bit ADC with 10 channels, and SCTimer/PWM subsystem - deployed in GPS trackers, medical monitors, and car radios.

For engineers reviewing the LPC11U68JBD64K datasheet, LPC11U68JBD64K pinout, LPC11U68JBD64K application, or LPC11U68JBD64K equivalent, key selection criteria include USB device capability without external crystal, 10-channel 12-bit ADC sampling up to 2 Msamples/s, deep power-down wake-up via PIO0_16, and LQFP64 package compatibility with 48 GPIO pins.

Technical Context

The LPC11U68JBD64K implements an ARM Cortex-M0+ core with two-stage pipeline, single-cycle I/O, and NVIC for deterministic interrupt handling. Its clock system includes dedicated USB PLL, main PLL, 12 MHz ±1% IRC, 32 kHz RTC oscillator, and programmable watchdog oscillator (9.4 kHz–2.3 MHz).

Peripheral architecture features AHB multilayer matrix, high-speed GPIO connected directly to the Cortex-M0+ IO bus, DMA engine with 16 channels, CRC engine, and configurable PWM/timer subsystem combining standard timers and State-Configurable Timers (SCT0/SCT1) supporting up to 19 PWM outputs across six independent time bases.

Key Specifications

Pinout & Package

LPC11U68JBD64K is housed in a plastic LQFP64 package (10 × 10 × 1.4 mm, SOT314-2), with 64 leads and exposed pad for thermal management. Pin functions are software-configurable via IOCON registers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC11U67JBD64 and LPC11U37FBD64, the LPC11U68JBD64K provides maximum on-chip memory (256 KB flash/36 KB SRAM) and integrated USB PHY with XTAL-less operation - enabling robust firmware updates, complex protocol stacks, and crystal-free USB device functionality in space-constrained industrial designs.

Availability

LPC11U68JBD64K is available at Aetrix Electronics and suitable for GPS trackers, medical monitors, and car radios requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LPC11U68JBD64K 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 focused on secure connectivity solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.

The LPC11U6x family was designed for cost-sensitive, USB-enabled embedded applications demanding low power, rich analog/peripheral integration, and rapid time-to-market - targeting portable instrumentation, smart sensors, and human-interface devices.

FAQ

What is the maximum operating frequency of the LPC11U68JBD64K?

The LPC11U68JBD64K operates at a maximum CPU frequency of 50 MHz using its ARM Cortex-M0+ core. This speed is achievable with either the internal 12 MHz ±1% IRC oscillator (with PLL multiplication) or an external crystal (1–25 MHz). The core's two-stage pipeline and single-cycle I/O ensure deterministic real-time response at this clock rate, and the LPC11U68JBD64K maintains full peripheral functionality across the entire 50 MHz range.

Does the LPC11U68JBD64K support USB without an external crystal?

Yes, the LPC11U68JBD64K includes an on-chip USB 2.0 full-speed device controller with integrated PHY and supports XTAL-less low-speed mode for enumeration. This eliminates the need for an external 12 MHz crystal in USB device applications, reducing bill-of-materials cost and PCB area. The LPC11U68JBD64K achieves reliable USB connectivity using its internal oscillators and calibrated timing circuits - verified per USB-IF compliance requirements.

How many ADC channels does the LPC11U68JBD64K have, and what is its sampling rate?

The LPC11U68JBD64K integrates a single 12-bit successive approximation register (SAR) ADC with up to 10 input channels (as implemented in the LQFP64 package). It supports sample rates up to 2 Msamples/s, with dual independent conversion sequences and multiple trigger sources (timer, GPIO, software). This ADC capability is fully retained in the LPC11U68JBD64K and enables high-fidelity sensor acquisition in applications like medical monitoring and energy metering.

What power modes does the LPC11U68JBD64K support, and how is wake-up handled?

The LPC11U68JBD64K supports Sleep, Deep-sleep, Power-down, and Deep power-down modes, managed by its integrated Power Management Unit (PMU). In Deep power-down mode, current drops below 1 µA, and wake-up is supported via external pin (PIO0_16 with 20 ns glitch filter), USART activity, or RTC alarm. The LPC11U68JBD64K requires external pull-up on PIO0_16 before entering Deep power-down and accepts a LOW pulse ≥50 ns to exit - ensuring deterministic low-power operation in battery-powered systems.

Is the LPC11U68JBD64K pin-compatible with other members of the LPC11U6x family?

Yes, the LPC11U68JBD64K shares identical LQFP64 pinout and electrical characteristics with other LPC11U6x variants in the same package (e.g., LPC11U67JBD64, LPC11U66JBD64). All LQFP64 versions use SOT314-2 mechanical dimensions and maintain function-aligned pin assignments across flash/SRAM configurations. This allows hardware design reuse and firmware scalability - the LPC11U68JBD64K can replace lower-memory variants without PCB changes, provided software accommodates increased memory resources.