LPC51U68

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Based on the highly energy-efficient Arm^® Cortex^®-M0+ core and operating at CPU frequencies of up to 150 MHz, NXP’s 32-bit LPC51U68 microcontrollers for embedded applications feature larger memory resources including 96 KB of on-chip SRAM and 256 KB of on-chip flash programming memory with flash accelerator.

NXP’s LPC51U68 MCU features added performance, expanded memory resources and flexible serial port configuration, including USB connectivity, bringing design flexibility, computing performance and integration into today’s demanding IoT and industrial applications. In addition, this MCU is pin compatible with the LPC5411x and LPC5410x MCU families providing scalability options to Arm Cortex-M4 cores.

Data Sheet

Reference Manual

Product Details

Block Diagram

LPC51U68 MCU

Get diagram PDF

Features

Arm Cortex-M0+ Core

Running at a frequency of up to 150 MHz
Single-cycle multiplier
Built-in nested vectored interrupt controller (NVIC)
Non-maskable interrupt (NMI) with a selection of sources

On-Chip Memory

256 KB on-chip flash programming memory with flash accelerator and 256 byte page write and erase
Up to 96 KB total SRAM composed of up to 64 KB main SRAM, plus an additional 32 KB SRAM

ROM API Support

Flash in-application programming (IAP) and in-system programming (ISP)
ROM-based USB drivers (HID, CDC, MSC, DFU) and flash updates via USB
Booting from valid user code in flash, USART, SPI and I2C
Legacy, single and dual image boot

Serial Interfaces

Eight flexcomm interface serial peripherals. Each can be selected by software to be a USART, SPI or I2C interface. Two flexcomm interfaces also include an I2S interface, for a total of 2 channel pairs. Each flexcomm interface includes a FIFO that supports USART, SPI and I2S if supported by that flexcomm interface. A variety of clocking options are available to each flexcomm interface and include a shared fractional rate generator
I2C supports fast-mode and fast-mode Plus with data rates of up to 1 Mbit/s and with multiple address recognition and monitor mode. Two sets of true open drain I2C pins also support high-speed Mode (up to 3.4 Mbit/s) as a target
USB full-speed device interface with option for crystal-less operation

Digital Peripherals

DMA controller with 18 channels and 16 programmable triggers, able to access all memories and DMA-capable peripherals
Up to 48 general-purpose I/O (GPIO) pins. A majority of GPIOs have configurable pull-up/pull-down resistors, open-drain mode and input inverter
GPIO registers are located on AHB for fast access
Up to four GPIOs can be selected as pin interrupts (PINT), triggered by rising, falling or both input edges
Two GPIO grouped interrupts (GINT) enable an interrupt based on a logical (AND/OR) combination of input states
CRC engine

Analog Peripherals

12-bit ADC with 12 input channels and multiple internal and external trigger inputs and sample rates of up to 5.0 MSamples/sec. The ADC supports two independent conversion sequences
Integrated temperature sensor connected to the ADC

Timers

Three standard general purpose timers/counters, four of which support up to 4 capture inputs and 4 compare outputs, PWM mode and external count input. Specific timer events can be selected to generate DMA requests
One SCTimer/PWM (SCT) 8 input and 8 output functions (including capture and match). Inputs and outputs can be routed to/from external pins and internally to/from selected peripherals. Internally, the SCT supports 10 captures/matches, 10 events and 10 states
32-bit real-time clock (RTC) with 1s resolution running in the always-on power domain. A high-resolution timer in the RTC can be used for wake-up from all low power modes including deep power-down with 1ms resolution
Multiple-channel, multi-rate 24-bit timer (MRT) for repetitive interrupt generation at up to four programmable fixed rates
Windowed watchdog timer (WWDT)
Ultra-low power micro-tick timer, running from the watchdog oscillator, that can be used to wake up the device from a majority of low power modes

Clock Generation

Internal FRO oscillator, factory trimmed for accuracy, that can optionally be used as a system clock as well as other purposes. This oscillator provides a selectable 48 MHz or 96 MHz output, and a 12 MHz output (divided down from the selected higher frequency) that can optionally be used as a system clock as well as other purposes
External clock input for up to 25 MHz
Watchdog oscillator with a frequency range of 6 kHz to 1.5 MHz
32 kHz low-power RTC oscillator
System PLL allows CPU operation up to the maximum CPU rate without the need for a high-frequency external clock. Maybe run from the internal FRO 12 MHz output, the external clock input CLKIN or the RTC oscillator
Clock output function with divider that can reflect many internal clocks
Frequency measurement unit for measuring the frequency of an on-chip or off-chip clock signal

Power Control

Integrated power management unit (PMU) to minimize power consumption
Reduced power modes: sleep mode, deep-sleep mode and deep power-down mode
Wake-up from deep-sleep mode on activity on USART, SPI and I2C peripherals when operating as followers
Wake-up from sleep, deep-sleep and deep power-down modes from the RTC alarm
The micro-tick timer can wake-up the device from a majority of reduced power modes by using the watchdog oscillator when no other on-chip resources are running, for ultra-low power wake-up
Power-On Reset (POR)
Brownout detect

Additional Information

Single power supply 1.62 V to 3.6 V
JTAG boundary scan supported
Serial wire debug (SWD) with 4 breakpoints and 2 watchpoints
Unique device serial number for identification
Operating temperature range of -40 °C to +105 °C
Available as LQFP64 and LQFP48 packages

Part numbers include: LPC51U68JBD48, LPC51U68JBD64.

Target Applications

High-performance gaming keyboard/mice
Industrial grade USB to serial port bridge
E-meter
Fingerprint recognition
USB audio device
Sensor hub with USB interface
Entry-level mobile POS

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

1-5 of 11 documents

^{Data Sheet}
LPC51U68 Data Sheet

PDFRev 1.5Dec 17, 20204.0 MBLPC51U68English
^{Reference Manual}
LPCXpresso51U68 development board (OM40005) User Manual

PDFRev 1.2Aug 7, 2018940.4 KBUM11121English
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^{Application Note}
How to Trigger and Detect Transmission Errors for LPC51U68 I2C

PDFRev 0Apr 20, 20213.5 MBAN13238EnglishAssociated File: AN13238SW
^{Application Note}
How to use SCT to generate PWM and control BLDC motor on LPC51U68

PDFRev 0Nov 10, 20204.0 MBAN13040EnglishAssociated File: AN13040SW
^{Application Note}
Porting USB Bootloader from LPC54018 to LPC51U68

PDFRev 0Feb 11, 20201.2 MBAN12689EnglishAssociated File: AN12689SW
^{Application Note}
LPC51U68 Crystal-less USB Solution

ZIPRev 1.0May 17, 201822.0 MBTN00035English
^{User Guide}
LPC51U68 User Manual

PDFRev 1.2Jan 13, 202011.8 MBUM11071English
Sign in required
^{Application Note Software}
Application note software for AN13238

ZIPRev 0Apr 20, 2021113.6 MBAN13238SWEnglish
^{Application Note Software}
Software package for AN13040

ZIPRev 0Nov 10, 202055.0 MBAN13040SWEnglish
^Errata
Errata sheet LPC51U68

PDFRev 1.4Jun 24, 2024183.5 KBES_LPC51U68English
^{Fact Sheet}
LPC51U68 MCUs – Fact Sheet

PDFRev 1Apr 18, 2018357.3 KBLPC51U68FAMFSEnglish

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Design Resources

Design Files

Quick reference to our design files types.

2 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

^Models
IBIS files for LPC51U68

ZIPRev 0Oct 21, 2020 08:38:00256.4 KBIBIS-LPC51U6X-FAMILY
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^{Printed Circuit Boards and Schematics}
LPCXpresso51U68 development board (OM40005) schematic (PDF), BOM and Gerber files.

ZIPRev AApr 30, 2018 12:37:00941.0 KBOM40005_DF
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Hardware

Quick reference to our board types.

3 hardware offerings

^{Evaluation and Development Boards}
LPCXpresso51U68 for the LPC51U68 MCUsFeatured

OM40005
^{Emulators, Probes, and Programmers}
MCU-Link Debug Probe

MCU-LINK
^{Emulators, Probes, and Programmers}
MCU-Link Pro Debug Probe

MCU-LINK-PRO

Software

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1-5 of 7 software files

^{BSPs and Device Drivers}
Open-CMSIS-Packs

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^{BSPs and Device Drivers}
MCUXpresso Config Tools: Pins, Clocks and Peripherals

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^{Examples and Quick Start Software}
MCUXpresso Software Development Kit (SDK)

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^Libraries
LVGL Open-Source Graphics Library

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^Middleware
Audio Software on NXP Microcontrollers

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^{Debugging and Visualization Tools}
LinkServer for Microcontrollers

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^{Development IDEs and Build Tools}
MCUXpresso Integrated Development Environment (IDE)

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Note: For better experience, software downloads are recommended on desktop.

High-Performance, Power-Efficient and Cost Sensitive Arm® Cortex®-M0+ MCUs

Product Details

Block Diagram

LPC51U68 MCU

Features

Arm Cortex-M0+ Core

On-Chip Memory

ROM API Support

Serial Interfaces

Digital Peripherals

Analog Peripherals

Timers

Clock Generation

Power Control

Additional Information

Target Applications

Related products

Buy/Parametrics

Documentation

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Design Resources

Design Files

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IBIS files for LPC51U68

LPCXpresso51U68 development board (OM40005) schematic (PDF), BOM and Gerber files.

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LPCXpresso51U68 for the LPC51U68 MCUsFeatured

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