NXP Semiconductors LPC11U68JBD100K

Overview

LPC11U68JBD100K 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, five USARTs (including RS-485 mode), two I²C interfaces (one Fast-mode Plus), and a 12-bit ADC with up to 12 channels - deployed in industrial metering and GPS tracking systems.

For engineers reviewing the LPC11U68JBD100K datasheet, LPC11U68JBD100K pinout, LPC11U68JBD100K application, or LPC11U68JBD100K equivalent, key selection criteria include its LQFP100 package with 80 GPIOs, dual PLL architecture (system + USB), RTC with VBAT support, and hardware-accelerated CRC/MTB/SWD debug capabilities.

Technical Context

The LPC11U68JBD100K implements an ARM Cortex-M0+ core (r0p1) with a two-stage pipeline, single-cycle I/O, and NVIC for deterministic interrupt handling. Its AHB multilayer matrix enables concurrent access to flash, SRAM, and peripherals while supporting DMA-triggered transfers from UART, ADC, and timers.

Clock generation includes a 12 MHz ±1% internal RC oscillator, programmable watchdog oscillator (9.4 kHz–2.3 MHz), crystal oscillator (1–25 MHz), and two dedicated PLLs - one for CPU operation up to 50 MHz and a second for USB 48 MHz clock synthesis - all managed via SYSCON and IOCON registers.

Key Specifications

Pinout & Package

LQFP100 package (14 mm × 14 mm, 1.4 mm height, SOT407-1); 100-pin quad flat lead frame with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC11U67JBD100 and LPC11U37FBD100, the LPC11U68JBD100K offers highest on-chip memory (256 KB flash/36 KB SRAM), full USB 2.0 FS capability with on-chip PHY, and comprehensive ROM-based driver support - making it optimal for feature-rich, connectivity-intensive edge devices requiring field-upgradable firmware.

Availability

LPC11U68JBD100K is available at Aetrix Electronics and suitable for three-phase e-metering, GPS tracking, and medical monitoring applications requiring stable component supply, long-term lifecycle assurance, and automotive-grade temperature resilience.

Supply support for LPC11U68JBD100K 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 product line was designed for cost-sensitive, USB-enabled embedded applications demanding high integration, low power, and rapid time-to-market - targeting smart sensors, portable medical devices, and industrial HMI controllers.

FAQ

What is the maximum operating frequency of the LPC11U68JBD100K?

The LPC11U68JBD100K operates at a maximum CPU frequency of 50 MHz, enabled by its ARM Cortex-M0+ core and supported by the system PLL. This frequency is achievable across the full industrial temperature range (−40 °C to +105 °C) when powered within the specified 2.4 V–3.6 V supply range. The LPC11U68JBD100K maintains timing compliance without derating under worst-case voltage and temperature conditions per its datasheet specifications.

Does the LPC11U68JBD100K support USB device functionality without an external crystal?

Yes, the LPC11U68JBD100K supports USB 2.0 full-speed device operation in XTAL-less low-speed mode, eliminating the need for an external 12 MHz crystal. Its integrated USB PHY uses internal clock recovery, enabling plug-and-play USB connectivity in space-constrained designs. The LPC11U68JBD100K retains full-speed capability (12 Mbps) in standard mode when a crystal is used, but the XTAL-less mode is validated for enumeration and basic CDC/HID class operation.

How many ADC input channels does the LPC11U68JBD100K support, and what is its sampling rate?

The LPC11U68JBD100K features a single 12-bit successive approximation register (SAR) ADC with up to 12 configurable input channels. Its maximum sample rate is 2 Msamples/s, achievable with appropriate clock configuration and minimal conversion overhead. The ADC supports two independent conversion sequences with flexible trigger sources (timer match, GPIO, software), allowing synchronized multi-channel acquisition critical for LPC11U68JBD100K-based metering and sensor fusion applications.

What low-power modes are available on the LPC11U68JBD100K, and how is wake-up implemented?

The LPC11U68JBD100K offers four low-power modes: Sleep, Deep-sleep, Power-down, and Deep power-down. Wake-up from Deep-sleep and Power-down modes is supported via external GPIO pins (including dedicated PIO0_16 with 20 ns glitch filter), USART activity, or RTC alarm. In Deep power-down mode, only the RTC and backup registers remain active, drawing sub-1 µA current; wake-up requires pulling PIO0_16 LOW externally, a capability explicitly documented for the LPC11U68JBD100K in its power management section.

Is the LPC11U68JBD100K pin-compatible with other members of the LPC11U6x family in LQFP100 package?

Yes, the LPC11U68JBD100K is fully pin-compatible with other LQFP100 variants in the LPC11U6x family, including LPC11U67JBD100 and LPC11U66JBD100. All share identical pin numbering, electrical characteristics, and peripheral pin mappings per the official NXP pin description table. This allows direct substitution in existing PCB layouts when upgrading flash/SRAM capacity or enabling additional features - provided firmware accommodates the increased memory resources of the LPC11U68JBD100K.