User`s Manual - Embedded Artists
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1. LPC2148 USB QuickStart Board User s Guide LPC2148 USB QuickStart Board User s Guide Get Up and Running Quickly and Start Developing on Day 1 migi LPC2148 USB QuickStart Board User s Guide Embedded Artists AB Davidshallsgatan 16 SE 211 45 Malm Sweden info EmbeddedaArtists com http www EmbeddedArtists com Copyright 2005 2012 Embedded Artists AB All rights reserved No part of this publication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior written permission of Embedded Artists AB Disclaimer Embedded Artists AB makes no representation or warranties with respect to the contents hereof and specifically disclaim any implied warranties or merchantability or fitness for any particular purpose Information in this publication is subject to change without notice and does not represent a commitment on the part of Embedded Artists AB Feedback We appreciate any feedback you may have for improvements on this document Please send your comments to support EmbeddedArtists com Trademarks All brand and product names mentioned herein are trademarks services marks registered trademarks or registered service marks of their respective owners and should be treated as such Copyright 2012 Embedded A2. Po PO Pi 24 a a z N P71 26 RTCK an D DO PO 2 8 TD 24 22 P K PO P74 30 TM ae p RST Po XD RESIN s RES OUT N eS PO O PIN 4 O x PIN PO R O PIN 5 R PIN PO XDO D GND EEA N E DO ele SRO DT OD a LS ESSER SCE SR ae Figure 4 Example JTAG Interface Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 2 2 Reset The on board I2C E2PROM CAT1025 also contains a reset generator The reset signal will be held active i e low until the supply voltages 3 3V is within margins The reset duration is typically 200 mS consult the CAT1025 datasheet for exact details The output reset signal is an open collector open drain output An external reset source can also control the reset generator Figure 5 below illustrate how an external push button can generate a reset Note that an external driver should be an open collector open drain driver LPC2148 QuickStart Board Ue q l 1 2 2 P l m o 3 4 gt 4 P120 P 5 e P 6 PO 24 BA rs vR 8 P116 E p BO P118 P119 PO20 Baan ET SET P030 16 PO 16 P0O 16 P124 p Ji H 6 R K 19 20 P IDO 20 Po l PLR TD BL2ATCK NEN l F Q 23 24 P IRST 24 PO8 TXD RES IN RES OUT DOA P04 R 0 PIN R 14 P02 R 0 PIN 32 R 1 32 PO 0 TXDO i GND GND GND ease cca sets i glee es cles toms ane ca Skee ass Sten oss che be nae es td me a _
3. Embedded Artists Embedded Artists have a broad range of LPC1000 2000 3000 4000 based boards that are very low cost and developed for prototyping development as well as for OEM applications Modifications for OEM applications can be done easily even for modest production volumes Contact Embedded Artists for further information about design and production services Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 2 5 1 Design and Production Services Embedded Artists provide design services for custom designs either completely new or modification to existing boards Specific peripherals and I O can be added easily to different designs for example communication interfaces specific analog or digital I O and power supplies Embedded Artists has a broad and long experience in designing industrial electronics in general and with NXP s LPC1000 2000 3000 4000 microcontroller families in specific Our competence also includes wireless and wired communication for embedded systems For example IEEE802 11b g WLAN Bluetooth ZigBee ISM RF Ethernet CAN RS485 and Fieldbuses 2 5 2 OEM Education QuickStart Boards and Kits Visit Embedded Artists home page www EmbeddedArtists com for information about other OEM Education QuickStart boards kits or contact your local distributor Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 Board Desig
4. QuickStart Board ISP Jumpers Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide The board interface connectors are placed in two 2x16 pin rows along the board edges They are 1200 mil 30 48 mm apart Figure 2 below illustrates the two row connectors and their signals Note that P0 26 and P0 27 are the USB signals and should normally be left unconnected unless and external USB connector is implemented Sometimes P0 23 is also used by the application and should also in this case be left unconnected 1 3 p P 3 4 a Pr 6 PO 25 SA PO23 3 10 P0 22 P021 12 P0 20 P0 19 si it P0 18 PO aiie Poic PO 1S F014 PO 20 FO PO 22 Po 40 POOR XD 123 24 Pos Txp PO 25 PUG PO 25 Pos PO3 SDA 29 30 PO 2SCL P0 1 RXDOS 32 P0 0 TXDO ND g 1 2 5 9 c VBAT r is VREF P1 16 _ 9 ID i P1 17 P118 11 aiit P118 poze 15 siit Foza Pozo 15 15 Fo Piz if 1S P125 P126 RTCK 20 P127 I00 P12 Tb 21 22 P123 I K P7130 S23 24 LP LRST B TEF 25 E QUT mad 25 RS232 0 PIN2 29 30 RS232 1 PIN2 RS232 0 PIN3 1 aiot RS232 1 PIN D D Figure 2 LPC2148 QuickStart Board Interface Connectors Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 1 Mechanical Dimensions Figure 3 below contains a drawing of the board that includes mechanical measures m P about 6 mm gt 59 mm about 1
5. arm lpc2000book index htm Also note that there can be newer versions of the documents than the ones linked to here Always check for the latest information version Copyright 2012 Embedded Artists AB
6. complement to this document 1 2 3 4 5 6 7 8 9 NXP LPC2148 Datasheet http ics nxp com products Ipc2000 datasheet Ipc2141 lpc2142 lpc2144 lpc2146 lpc2148 pdf NXP LPC2148 User s Manual http ics nxp com support documents microcontrollers pdf user manual lpc2141 lpc2142 lpc2144 lpc2146 lpc2148 pdf NXP LPC2148 Errata Sheet http ics nxp com support documents microcontrollers pdf errata lpc2148 pdf ARM7TDMI Technical Reference Manual Document identity DDIO029G http www arm com pdfs DDI0029G_7TDMI_R3_trm pdf ARM Architecture Reference Manual Document identity DDIO100E Book Second Edition edited by David Seal Addison Wesley ISBN 0 201 73719 1 Also available in PDF form on the ARM Technical Publications CD ARM System Developer s Guide Designing and Optimizing System Software by A N Sloss D Symes C Wright Elsevier ISBN 1 55860 874 5 Embedded System Design on a Shoestring by Lewin Edwards Newnes ISBN 0750676094 GNU Manuals http Awww gnu org manual GNU ARM tool chain for Cygwin http www gnuarm com 10 An Introduction to the GNU Compiler and Linker by Bill Gatliff http www billgatliff com 11 LPC2000 Yahoo Group A discussion forum dedicated entirely to the NXP s LPC2xxx series of microcontrollers http groups yahoo com group pc2000 12 The Insider s Guide to the NXP s ARM7 Based Microcontrollers by Trevor Martin http Avww hitex co uk
7. frequency is 12 0000 MHz This frequency has been selected in order to allow maximum execution speed 5 x 12 MHz 60 MHz which is the maximum frequency The on chip UART peripheral includes a fractional baud rate generator that allow standard baud rates to be generated form the 60 MHz base clock The USB clock is also generated from the 60 MHz clock without any problems The crystal frequency can be changed to any desired value for OEM orders provided that the conditions in the LPC2148 datasheet are met Current requirements are but consult the most current datasheet for latest details e 1 30 MHz if the on chip phase locked loop PLL is not used or e 10 25 MHz if the PLL is to be used The design has direct and automatic support for program downloading via ISP over the RS232 serial channel The o RS232 signal DTR controls the reset signal to the LPC2148 S microcontroller The RS232 signal RTS is connected to pin a P0 14 in the LPC2148 microcontroller This pin is sampled after USBB i piam reset and determines if the internal bootloader program shall be gt Le ad started or not A low signal after reset enters the bootloader too mode The RTS DTR signals can be disconnected from the microcontroller via two links jumpers on the board See Figure iP 1 below for details Link to get power from the USB interface In order from top to bottom J7 Reset J6 P0 14 Figure 1 LPC2148
8. swi T 4 PUSHBUTTON LHEU GND Figure 5 Example External Reset Push button Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 2 3 12C The LPC2148 microcontroller has an on chip 2C communication channel actually two but one is used and the other is optional The LPC2148 USB QuickStart Board has connected a 2 Kbit E PROM to this bus More peripheral units are easily connected to the two wire 12C bus Figure 6 below illustrates how a pin expander circuit PCF8574 can be connected to the 12C bus LPC2148 QuickStart Board 1 2 alo ali P se Ste l BA Ce Ole vr p Tats fe Te N ae i P0 30 EE op e l fe eo p RICK Salo E IETS 24 Fo Prao 1Ms ale O2 e RESIN ofi T R 271 ote 8S232 0 PIN 2912 io Tt R 2S732 0 PIN f T R j Fa ae E PSE ee EEE E E SND l POF8574T D Not all pins connected Only I2C signals and power supply connections shown Figure 6 Example 12C Interface Note that the pull up resistors which are always needed on IC busses are included on the LPC2148 USB QuickStart Board and are hence not needed on the external circuit The pull up resistors are 3000 ohm each see Fel Hittar inte referenskalla for complete board schematics If using the second 12C channel do not forget to connect pull up resistors to these signals also Note that this must be done even if the 12C functionality is
9. 4 mm 30 48 mm 1200 mil 39 5 mm X Figure 3 LPC2148 QuickStart Board Mechanical Dimensions Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 2 Examples This section contains a few sample illustrative circuit examples that will help you to quickly get up and running with the board interface design Detailed information about the on chip peripheral units can be found in the LPC2148 User s Manual 3 2 1 JTAG The LPC2148 microcontroller contains a JTAG interface that can be used for debug purposes during program development The circuit in Figure 4 below works for many JTAG interfaces on the market including CrossConnect from Rowley Associates J link from Segger Ulink from Keil and Wiggler from MacRaigor The signal RTCK on the LPC2148 microcontroller is sampled during reset Jumper J5 drives the signal low If the signal is found low the JTAG interface is enabled Pin P1 26 P1 31 then changes from being general I O pins to dedicated JTAG pins Note that many Wiggler JTAG interfaces do not work with a processor crystal frequency above about 10 MHZ If this is the case the crystal frequency can be changed by desoldering the 12 0000 MHz crystal and replace it with another suitable one LPC2148 QuickStart Board De ee q l o 1 52 N z 2 alo of4 gt p 4 C 2 BD l BA gt Cle ve Bo D 9 10 P PO e oTe J PO a ali Po Po P0 30 15 ais
10. CT GND 3 GND 4 Figure 7 Example SPI Interface Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 2 5 LEDs The port pins of the LPC2148 microcontrollers have a 4 mA driving capacity just enough to directly drive LEDs Figure 8 below illustrates how current is sourced from sink to the microcontroller to drive the LEDs The resistors limit the current to about 4 mA The preloaded test program described in Section 4 1 outputs a running zero on all the port pins P0 4 P0 31 P1 16 P1 31 except the USB pins A circuit like the one in Figure 8 below can be used to verify correct operation use active low circuit LPC2148 QuickStart Board Se Se a E ee 1 2 o oO 3 4 gt F ste ae 2 BA 712 Sf uR z Cels alo e PO rejo of 14 Po Po 30 mis Po p at OTe Te p RICKI i9f 20 P DO p D of p K Pi30 TMS 2316 alka Le RST RES IN O16 _ _RES OUT Te Os R 0 PIN Y 297 ao R PIN R 0 PIN aio PIN D D ETa pea a WS ea AE ee ee Fe ae ee re ee Active high Oo oO O oO oO ETS oF ETS ZTS ETS N a x pe 8 Q m Q OO Q Feu Fu Fu oe syu uy GND D GND D GND Figure 8 Example LED Driving Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 4 Getting Started 41 Test program The LPC2148 USB QuickStart Board comes preloaded with a test program This program can be used to verify that
11. TC crystal e ESD EMI protected RS232 channel with DSUB 9 connector Both UART 0 and 1 connected Signals available on expansion connector e 2 Kbit 2C E PROM for storing non volatile parameters e Onboard low dropout voltage and reset generation Generates 3 3V from a single 5V supply 3 3V available for external circuits up to 300 mA Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide Power supply 5 10 VDC at least 150 mA or via USB connector e Simple and automatic program download ISP via RS232 channel Circuit that automatically controls the bootloader from RS232 channel e Dimensions 59 x 39 5 mm Small form factor for easy integration Dual 2x16 pins I O connectors Four layer PCB FR 4 material for best noise immunity 2 3 ESD Precaution Please note that the LPC2148 USB QuickStart Board come without any case box and all components are exposed for finger touches and therefore extra attention must be paid to ESD electrostatic discharge precaution Make it a habit always to first touch the metal surface of the USB connector for a few seconds with both hands before touching any other A parts of the board That way you will have the same potential as the board and therefore minimize the risk for ESD Note that Embedded Artists does not replace boards that have been damaged by ESD 2 4 CE Assessment The LPC2148 USB QuickStart Board is CE marke
12. am cycle completed est 3 read string from address 6x6060 string is String 1 est 4 read string from address 6x80a0 string is sTrInG 2 est 5 write string sTrInG 2 to address 6x 004 done status code OK gt program cycle completed est 6 read string from address 6x 000 string is StrisTrInG 2 Summary of tests Passed all testst RTC test rassi test OK I O and UART test Loop through all 1 0 pins running gt P 4 to P 31 P1 16 to P1 31 lt not in above order P 2 to P 3 tested via EEPROM and I2C test P to P 1 tested via UART test KKK KK KKK Press any key on terminal and verify echo back 116 decimal 161 decimal 115 decimal gt 116 decimal 105 decimal lt 11 decimal 183 decimal Received char Received char Received char Received char Received char Received char Received char Qa ete Ot Figure 9 Example Test Program Output 4 2 Program Development Consult the QuickStart Program Development User s Manual for more information about the QuickStart Build Environment from Embedded Artists and program development for the ARM7 in general Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 5 Further Information The LPC2148 microcontroller is a complex circuit and there exist a number of other documents with a lot more information The following documents are recommended as a
13. d See separate CE Declaration of Conformity document The LPC2148 USB QuickStart Board is a class B product EMC emission test has been performed on the LPC2148 USB QuickStart Board The USB interface has been in use and also powered the device during the test General expansion connectors where internal signals are made available have been left unconnected Connecting other devices to the product via the general expansion connectors may alter EMC emission It is the user s responsibility to make sure EMC emission limits are not exceeded when connecting other devices to the general expansion connectors of the LPC2148 USB QuickStart Board Due to the nature of the LPC2148 USB QuickStart Board an evaluation board not for integration into an end product fast transient immunity tests and conducted radio frequency immunity tests have not been executed Externally connected cables are assumed to be less than 3 meters The general expansion connectors where internal signals are made available do not have any other ESD protection than from the chip themselves Observe ESD precaution Note that the LPC2148 USB QuickStart Board can also be considered to be a component if integrated into another product The CE mark on the LPC2148 USB QuickStart Board cannot be extended to include the new user created product It is the user s responsibility to make sure EMC emission limits are not exceeded and CE mark the final product 2 5 Other Products from
14. ickStart Board contains the following e The LPC2148 USB QuickStart Board In addition the following is needed in order to start developing applications with the LPC2148 USB QuickStart Board e ADC power supply 5 10 volt capable of providing at least 150 mA more if external circuits need power from the 3 3 volt supply The LPC2148 USB QuickStart Board does not contain reverse polarity protection Consult the schematic and the LD1117 datasheet for details about the voltage regulator e A serial extension cable DB9 male to DB9 female DB9M DM9F for connecting the LPC2148 USB QuickStart Board to a PC e AUSB cable of type B to A both male connectors e An optional Prototype QuickStart Board to quickly get up and running with the hardware See Embedded Artists homepage for more information about the Prototype QuickStart Board e An optional JTAG interface for program development debugging 2 2 Features Embedded Artists LPC2148 USB QuickStart Board lets you get up and running quickly with NXA s ARM7TDMI LPC2148 microcontroller The small form factor board offers many unique features that ease your development e NXP ARM TDMI LPC2148 microcontroller with 512 KByte program Flash and 32 8 KByte SRAM e All LPC2148 I O pins are available on connectors e 12 0000 MHz crystal for maximum execution speed and standard serial bit rates Phase locked loop PLL multiplies frequency with five 5 x 12 MHz 60 MHz e 32 768kHz R
15. n This chapter contains detailed information about the electrical and mechanical design of the LPC2148 USB QuickStart Board The schematic can be downloaded in pdf format from the support page and is recommended to have printed out while reading this chapter A number of example circuits are also presented that will lower the threshold of start developing applications with the board Besides the LPC2148 microcontroller from NXP the board contains an USB interface a 3 3V low dropout voltage regulator a 2 Kbit I C E7PROM with reset generation and an ESD EMI protected RS232 serial channel Both UART channels on the processor can use the RS232 interface Only UART 0 is however connected to the DSUB 9 connector A red LED is connected to the reset signal and lights when reset is active i e the signal is low Power can either be supplied via the expansion connector or via the USB connector Powering via the USB connector should only be used if the external power need is limited to 100 150 mA If the board is powered from the USB interface jumper J6 must be inserted see schematic above Also note that it is not allowed to both power the board from the USB interface and from an external source 5V DC The USB interface typically on the PC side can get damaged in that case The USB interface supports the Soft Connect functionality and voltage sense see LPC2148 User s Manual for more information about these functions The microcontroller crystal
16. not used enabled Pins P0 11 and P0 14 are open drain I Os and must have pull up resistors when configured as outputs This is unfortunately easy to forget Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 3 2 4 SPI The LPC2148 microcontroller also has two on chip SPI serial communication channels Figure 7 below illustrates how serial E PROM chip a shift register and a SD MMC memory card are connected to the LPC2148 USB QuickStart Board In the schematic below signal SSEL i e P0 7 has been pulled high This is normally required when the SPI controller operates as a master and master operation is typically the normal operating mode Note however that for the LPC214x series SSEL is no longer required to be pulled high when operating as a SPI master It can be used as a general purpose I O A good use for this pin is to use it as chip select for one of the SPI slave s to communicate with In Figure 7 below signal P0 30 is used as an example to control the chip select to the serial E7PPROM chip but for the LPC214x series it could just as well have been the P0 7 SSEL pin or any other pin Note that one chip select signal is requires for each external chip that is connected to the SPI bus LPC2148 QuickStart Board 3v3 in CS ts cof of ACEEEO ET Not all pins connected Only SPI signals and power supply connections shown RSV2 CARD DETECT OMMON WRITE PROTE
17. rtists AB LPC2148 USB QuickStart Board User s Guide Page 3 Table of Contents 1 Document Revision History 4 2 Introduction 5 2 1 Contents 5 2 2 Features 5 2 3 ESD Precaution 6 2 4 CE Assessment 6 2 5 Other Products from Embedded Artists 6 2 5 1 Design and Production Services 7 2 5 2 OEM Education QuickStart Boards and Kits 7 3 Board Design 8 3 1 Mechanical Dimensions 10 3 2 Examples 11 3 2 1 JTAG 11 3 2 2 Reset 12 32 3 PC 13 3 2 4 SPI 14 3 2 5 LEDs 15 4 Getting Started 16 4 1 Test program 16 4 2 Program Development 16 5 Further Information 17 Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 1 Document Revision History Revision Date Description v1 2 2012 01 13 Added this revision history table Added note about ESD precaution and CE marking Removed schematic from document Copyright 2012 Embedded Artists AB LPC2148 USB QuickStart Board User s Guide 2 Introduction Thank you for buying Embedded Artists LPC2148 USB QuickStart Board based on NXP s ARM7TDMI LPC2148 microcontroller This document is a User s Guide that describes the LPC2148 USB QuickStart Board design along with the accompanying software and program development tools The document contains information on how to use and integrate the board in your own designs including electrical and mechanical information 2 1 Contents The box received when ordering the LPC2148 USB Qu
18. the board operates correctly A circuit like the one found in Figure 8 above can be used to attach LEDs to port pins P0 4 P0 31 P1 16 P1 31 except the USB pins Pins P0 0 P0 1 are tested via the serial channel and pins P0 2 P0 3 are tested via the I2C bus Connect also a USB cable between the LPC2148 USB QuickStart Board and a PC The PC will react to the connection and signal that it has found new hardware The test program outputs a running zero to the port pins meaning that one LED ata time will light in a running one pattern Also a terminal program should be attached to the RS232 DSUB 9 connector The test program will output test information regarding the 12C and E2PROM test Also the UART RS232 channel can be tested by typing characters in the terminal program The settings for the terminal program are 38 4 kbps 8 data bits no parity bits and one stop bit i e 8N1 The output from the test program will look something like in Figure 9 below Note that the picture below is just an example and not the actual output text LPC2106 gcc newlib v1 0 0 0 deploy lof x Test program for LPC213x QuickStart Board Version 1 0 Date 2005 87 12 lt C Embedded Artists 2005 KKK KK EEPROM and I2C test est 1 write string String 1 to address 6x 000 done status code OK program cycle completed est 2 write string sTrInG 2 to address x 8a8 done status code OK gt progr
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