User manual

LPC3250 Developer’s Kit v2 - User’s Guide

Page 48

5 Getting Started

This chapter contains information about how to get acquainted with the LPC3250 Developer’s Kit.

Please read this section first before you start using the board - it will be well spent time!

5.1 Powering

The board can normally be powered from a PC/laptop via the included USB cable (mini-B to A cable).

This is done via the USB-to-UART connector and will work in most cases. Note however that not all

PC/laptops can provide the needed current. An external USB hub can be used in this case or an

external power supply.

A separate power supply is always needed in stand-alone situations or when running USB Host

application (when powering external USB devices). If USB Host is not used (or used with very low

external current consumption), a 5VDC/1 Amp power supply (5W) is all what is needed. If USB Host is

used with high external current consumption or a display with high current consumption, a 5VDC/2-2.5

Amp power supply (10-12.5W) is needed. A 2.1mm standard power plug is used to interface the board.

Center pin is positive.

See Figure 26 below for locating the USB connector and/or the 2.1mm power connector.

It is possible to have both the USB cable and external powering connected to the board at the same

time.

Figure 26 – Powering of OEM Base Board

5.2 Installing USB Driver

The OEM Base Board contains an USB-to-UART bridge chip (FT232R from FTDI) that connects UART

channel #5 on the LPC3250 to a virtual COM port on the PC/laptop (via USB). This UART channel is

typically used as the console channel for applications. Printf() output can for example be directed to

this UART channel.

Power

Supply

Your PC/Laptop

USB cable

Optional Powering alt#1

USB Hub

Optional Powering alt#2