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From the mbed microcontroller Handbook.  

mbed NXP LPC1768

Take the mbed Tour Order and mbed Microcontroller

Rapid Prototyping for general microcontroller applications, Ethernet, USB and 32-bit ARM® Cortex™-M3 based designs

mbed NXP LPC1768

Overview

The mbed Microcontrollers are a series of ARM microcontroller development boards designed for rapid prototyping.

The mbed NXP LPC1768 Microcontroller in particular is designed for prototyping all sorts of devices, especially those including Ethernet, USB, and the flexibility of lots of peripheral interfaces and FLASH memory. It is packaged as a small DIP form-factor for prototyping with through-hole PCBs, stripboard and breadboard, and includes a built-in USB FLASH programmer.

http://mbed.org/media//img/boardlogos/lpc1768/pinout.png

It is based on the NXP LPC1768, with a 32-bit ARM Cortex-M3 core running at 96MHz. It includes 512KB FLASH, 32KB RAM and lots of interfaces including built-in Ethernet, USB Host and Device, CAN, SPI, I2C, ADC, DAC, PWM and other I/O interfaces. The pinout above shows the commonly used interfaces and their locations. Note that all the numbered pins (p5-p30) can also be used as DigitalIn and DigitalOut interfaces.

The mbed Microcontrollers provide experienced embedded developers a powerful and productive platform for building proof-of-concepts. For developers new to 32-bit microcontrollers, mbed provides an accessible prototyping solution to get projects built with the backing of libraries, resources and support shared in the mbed community.

Features

Tools and Software

The mbed Microcontrollers are all supported by the mbed.org developer website, including a lightweight Online Compiler for instant access to your working environment on Windows, Linux or Mac OS X.

Also included is a C/C++ SDK for productive high-level programming of peripherals. Combined with the wealth of libraries and code examples being published by the mbed community, the platform provides a productive environment for getting things done.

The mbed NXP LPC1768 is one of a range of mbed Microcontrollers packaged as a small 40-pin DIP, 0.1-inch pitch form-factor making it convenient for prototyping with solderless breadboard, stripboard, and through-hole PCBs. It includes a built-in USB programming interface that is as simple as using a USB Flash Drive. Plug it in, drop on an ARM program binary, and its up and running! It is our most full featured board and is great for all kinds of general prototyping. If you're not sure which mbed to get, this is your best choice.

Technical Reference

Power

Pins

The microcontroller I/O is all 3.3v logic, but 5v tolerant. A digital pin can drive 40mA, up to a total of 400mA.

Schematics and Data Sheets

mbed NXP LPC1768 Microcontroller

NXP LPC176x MCU

See also



calendar Page history
Last modified 1 week, 3 days ago, by   user Simon Ford   tag No tags | 15 comments      

15 comments on mbed NXP LPC1768:

user Jon Green
05 Aug 2010

The LPC1768 datasheet can be found at http://www.nxp.com/documents/data_sheet/LPC1768_66_65_64.pdf

user Anders Hörnfeldt
01 Sep 2010

Thats an old datasheet. Here is a new one: Rev. 6 — 25 August 2010 http://ics.nxp.com/products/lpc1000/datasheet/lpc1763.lpc1764.lpc1765.lpc1766.lpc1767.lpc1768.lpc1769.pdf

user Alejandro Celery
17 Oct 2010

I have a question, the lpc1768 datasheet states (on page 45, static characteristics) that the I/O pins can drive +/- 4mA, not 40mA. I checked for an errata sheet and found nothing about this. Is the 40mA spec stated above wrong? Or the datasheet? Could you please clarify? Thanks!

Regards, Alex

user Anton Kljun
19 Oct 2010

These are the lines for data you are looking for:

/media/uploads/rostrum/sc_output_current.png

user Alejandro Celery wrote:

I have a question, the lpc1768 datasheet states (on page 45, static characteristics) that the I/O pins can drive +/- 4mA, not 40mA. I checked for an errata sheet and found nothing about this. Is the 40mA spec stated above wrong? Or the datasheet? Could you please clarify? Thanks!

Regards, Alex

user Simon Brouwer
27 Oct 2010

Short-circuit current values are not the same as drive capability. Most circuits you'd want to drive will require some voltage as well as current to do something useful. Also these are maximum values; actual values may be significantly lower.

From the data that Alex refers to you can determine that the output resistance of the I/O driver is at most 100 ohms as long as you don't draw more current than 4 mA / output voltage drop is less than 0.4V. However, you cannot just assume this resistance will be constant at stronger loads, at some higher voltage drop the output MOSFET may saturate.

In short, although you may be able to draw considerably more than 4 mA from an output, you can't really count on anything beyond what is specified.

Best regards, Simon

user Carlo C
14 Nov 2010

Question...

in schematic diagram you can note that LINK_LED and SPEED_LED fron net i/f are wired to mbed i/f ic... I would like to read them to mimic standard ethernet RJ45 leds...

How can I access them?

user Rick Frankland
26 Nov 2010

Hi, is there any information on MBED-IF01 (IC1), something like a datasheet. No doubt it is a FPGA with a custom configuration for the mbed.

What is needed is:
MBED-IF01 purpose and how it achieves that purpose in the mbed environment.
i.e.

  • Inputs TARGET_RESET_REQ1 and TARGET_RESET_REQ2 are connected via "or" logic to output TGT_NRESET (-> input LPC1768 NRESET)
  • The RESET is connected "+3.3V". To reset power cycle the mbed.
  • CFG lines? where is each of 6 rectangular pads? is CFG6 -X the large VIA test-point? what does it provide?
  • IO lines?
  • NC lines?
  • FLASH lines?
  • etc.

The information on the raw unconfigured underling FPGA(??) device is NOT that useful.

user Igor Skochinsky
26 Nov 2010

It's not FPGA, it's another ARM chip (LPC2368 IIRC). You can find some info here.

user Walther Plath
13 Dec 2010

which is the max load I can drive with the 3.3 regulated output? My GPS application consumes around 120mA but this seems to be to much for the LPC1768. The datasheet of the used LD1117S33 promised up to 800mA, so I was hopeful to drive my app directly, but now I need obviously an external power supply :-(

user Thomas Olson
15 Dec 2010

user Igor Skochinsky wrote:

It's not FPGA, it's another ARM chip (LPC2368 IIRC). You can find some info here.

The mbed interface chip you are referring to is a LPC2148 and is on the bottom of the board. The old mbed used LPC2368 instead of the now LPC1768 for the target.

user Robin Elvin
25 Feb 2011

Can someone clarify whether I need to use pull-up resistors or not? It says above that the pull-up resistors are on board and so can be driven by an open collector but on the I2C page it says pull-up resistors are required. Is that something peculiar to I2C?

Thanks

user X M
04 Jun 2011

Errata - There is also a LPC1768 minor bugs datasheet , http://ics.nxp.com/support/documents/microcontrollers/pdf/errata.lpc176x.pdf

user Tommy Heyser
04 Jul 2011

The reference card I received with the mbed shows Vin to be 4.5V - 14.0V In, but the above shows 4.5V - 9.0V In. Which one is correct? I also have an older mbed that says 9.0V on the quick reference card. Has there been an update that allows Vin to be up to 14V?

user Jeremy Wai
24 Dec 2011

I read from http://www.nxp.com/products/microcontrollers/cortex_m3/lpc1700/LPC1768FBD100.html that the chip itself have several timers, but i can't find it on mbed NXP LPC1768 board. does that mean it's not connected to a break out pin?

user Christian Lerche
24 Dec 2011

The timers are internal

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