NXP Semiconductors LPC11U68JBD100E

Overview

LPC11U68JBD100E 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 a full-speed USB 2.0 device controller with XTAL-less low-speed mode, a 12-bit ADC with up to 12 channels and 2 Msamples/s sampling rate, and supports 80 GPIO pins. It is deployed in GPS trackers requiring compact, low-power, USB-connected embedded control.

For engineers reviewing the LPC11U68JBD100E datasheet, LPC11U68JBD100E pinout, LPC11U68JBD100E application, or LPC11U68JBD100E equivalent, key selection criteria include USB device capability without external crystal, 12-bit ADC performance with dual conversion sequences, deep power-down wake-up via PIO0_16, RTC with separate VBAT supply, and support for five USARTs with DMA and RS-485 mode.

Technical Context

The LPC11U68JBD100E implements an ARM Cortex-M0+ core (r0p1) with a two-stage pipeline, single-cycle I/O, and integrated NVIC. Its clock system includes a 12 MHz internal RC oscillator trimmed to ±1 % over −25 °C to +85 °C, a dedicated USB PLL, and a programmable watchdog oscillator (9.4 kHz–2.3 MHz).

Peripheral architecture centers on an AHB multilayer matrix enabling concurrent access to flash, SRAM, and peripherals. The configurable PWM/timer subsystem combines two 16-bit and two 32-bit standard timers with two State-Configurable Timers (SCTimer/PWM), delivering up to 19 PWM outputs across six independent time bases and supporting match/capture functions with hardware trigger routing to DMA.

Key Specifications

Pinout & Package

LPC11U68JBD100E is housed in a 100-pin LQFP package (14 mm × 14 mm, 1.4 mm height, SOT407-1), with exposed pad for thermal management and compatibility with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPC11U67JBD100 and LPC11U37FBD100, the LPC11U68JBD100E provides the highest on-chip memory (256 KB flash/36 KB SRAM) and retains full USB 2.0 device functionality with XTAL-less operation - making it the optimal choice for next-generation USB-connected embedded systems requiring field-upgradability and sensor-rich operation.

Availability

LPC11U68JBD100E is available at Aetrix Electronics and suitable for GPS trackers, medical monitors, car radios, and three-phase e-meters requiring stable component supply, long-term lifecycle assurance, and automotive-grade temperature resilience.

Supply support for LPC11U68JBD100E 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, and IoT applications, with headquarters in Eindhoven, Netherlands.

The LPC11U6x family was designed specifically for cost-sensitive, USB-enabled embedded control applications demanding low power, high integration, and rapid time-to-market - targeting portable instrumentation, smart peripherals, and energy metering systems.

FAQ

What is the maximum operating frequency of the LPC11U68JBD100E?

The LPC11U68JBD100E 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) with a 2.4 V–3.6 V supply, and is sustained using either the internal 12 MHz RC oscillator (trimmed to ±1 %) or an external crystal up to 25 MHz.

Does the LPC11U68JBD100E support USB device functionality without an external crystal?

Yes, the LPC11U68JBD100E includes a full-speed USB 2.0 device controller with on-chip PHY and supports XTAL-less low-speed mode. This allows USB enumeration and basic device operation using the internal oscillator, eliminating the need for an external 12 MHz crystal - confirmed in Section 2 "Features and benefits" and Table 2 of the datasheet.

How many ADC channels does the LPC11U68JBD100E support, and what is its maximum sample rate?

The LPC11U68JBD100E integrates a single 12-bit ADC supporting up to 12 input channels with a maximum sample rate of 2 Msamples/s. It also supports two independent conversion sequences, enabling simultaneous sampling of multiple sensor inputs - a capability explicitly documented in the "Analog peripherals" section of the datasheet.

What power-saving modes are available on the LPC11U68JBD100E, and how is wake-up implemented?

The LPC11U68JBD100E supports Sleep, Deep-sleep, Power-down, and Deep power-down modes. Wake-up from Deep-sleep and Power-down modes is possible via external pin interrupts (e.g., PIO0_16 with 20 ns glitch filter) or USART activity. The Deep power-down mode achieves sub-μA current draw while retaining RTC and backup register contents using the VBAT supply.

Is the LPC11U68JBD100E pin-compatible with other members of the LPC11U6x family in LQFP100 packaging?

Yes, all LQFP100 variants of the LPC11U6x family - including LPC11U67JBD100 and LPC11U68JBD100 - share identical pinouts and package dimensions (SOT407-1). This enables hardware reuse across memory variants, provided firmware accommodates differences in flash size, SRAM allocation, and peripheral enablement per datasheet Table 2.