OM13042,598

AN11231 KNX evaluation board using LPC1227 and NCN5120 Rev. 1 — 1 July 2012 Application note Document information Info Content Keywords KNX, LPC1227, On Semiconductor NCN5120, Weinzierl Engineering GmbH, Building Automation, Sensors, HVAC, Lighting, ARM Cortex M0, Twisted pair TP1 Abstract This application note describes the OM13042 KNX evaluation board that uses the LPC1227 Cortex M0 microcontroller and the NCN5120 KNX TP1 physical layer transceiver from On Semiconductor. AN11231 NXP Semiconductors KNX evaluation board Revision history Rev Date Description 1 Initial version 20120701 Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 2 of 18 AN11231 NXP Semiconductors KNX evaluation board 1. Document purpose The purpose of this document is to describe the OM13042 KNX evaluation board design. This document is intended for technical persons such as system architects, hardware and software engineers interested in designing and developing a KNX device using an NXP microcontroller. 2. Introduction The KNX evaluation board is an example implementation for KNX devices using an NXP Cortex M0 microcontroller LPC1227, the KNX twisted pair transceiver NCN1520 from On Semiconductor and a KNX System B software stack from Weinzierl Engineering GmbH. Fig 1. OM 13042 KNX TP1 NCN5120 LPC1227 evaluation board The board supports the connection of actuators, sensors, switches or other applications in a building automation network. The evaluation board is available under the full name OM13042,598 and order code 935298293598. 3. Hardware This chapter provides an overview of the board, its partitioning and all other hardware related information of the evaluation board. 3.1 Overview An overview of the main components of the evaluation board is given in Fig 2. The transceiver IC NCN5120 connects via UART to the LPC1227 microcontroller. Furthermore the transceiver creates a regulated 3.3 V power supply for the microcontroller from the unregulated bus supply. The LPC1227 creates a clock signal for AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 3 of 18 AN11231 NXP Semiconductors KNX evaluation board the digital control part of the transceiver. Several buttons and LEDs are available as sensor and actuator inputs to the system. Buttons LEDs + 3.3 V CLK KNX TP1 NCN5120 UART LPC1227 Mode UART isolation debug UART Extension header Fig 2. Evaluation board overview 3.2 PCB overview The evaluation board is a two layer board with all components on the top side of the board. The component placement is given in Fig 5. Fig 3. Component placement top side The upper left part of the board contains the KNX TP1 header K1 to connect the KNX bus. Below the KNX connector, the board contains the physical transceiver part of the design. On the left bottom side the isolated UART interface is available on header SV2. AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 4 of 18 AN11231 NXP Semiconductors KNX evaluation board User interface KNX Physical Layer Fig 4. SWD Measure Isolated UART Microcontroller Expansion connector Partitioning of the design In the middle of the board, a header is available to measure the various signals between the microcontroller and the transceiver. The top part contains the user interaction: LEDs and buttons. The header on the right hand side provides a debug probe connection that complies with the Serial Wire Debug (SWD) interface standard. To interface with other boards an extension connector is present on the lower part of the board. See Fig 4. 3.3 Microcontroller To allow easy KNX application development, the development board is equipped with an LPC1227 Cortex M0 microcontroller with a flash memory size of 128 kB and 8 kB of RAM. This allows for downgrading to other LPC122x microcontrollers with smaller memory sizes while maintaining software and hardware compatibility. More information on the LPC122x microcontroller series is available in the LPC122x datasheet [1]. The microcontroller uses UART1 to connect to the transceiver. Furthermore, some GPIO’s are used to connect to the KNX Phy. The second UART (UART0) on the design can be used to connect an external terminal program for debugging messages. The debug UART is electrically isolated from the design and the KNX bus. Software can be downloaded via the SWD interface and debugged to the microcontroller on header J4. The LPC1227 user manual [2] contains a full description of the processing core and all the on board peripherals of the microcontroller. Fig 5 gives the schematic of the microcontroller section of the board. AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 5 of 18 AN11231 NXP Semiconductors KNX evaluation board Fig 5. LPC1227 Microcontroller section of the schematic AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 6 of 18 AN11231 NXP Semiconductors KNX evaluation board 3.4 KNX physical layer The twisted pair 1 (TP1) KNX physical layer standard is used in the design. The design uses an NCN5120 receiver-transmitter IC for TP1 communication. The NCN5120 handles the transmission and reception of data on the bus. It generates stabilized voltages from the unregulated KNX bus for its own power needs as well as power for external devices as the microcontroller in this design. The NCN5120 assures safe coupling to and decoupling from the bus. Bus monitoring warns the external microcontroller for loss of power so that critical data can be stored in time. AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 7 of 18 AN11231 NXP Semiconductors KNX evaluation board Fig 6. KNX physical layer using OnSemi NCN5120 AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 8 of 18 AN11231 NXP Semiconductors KNX evaluation board 3.5 Isolated UART interface The isolated debug UART can be used for showing messages on a terminal. The 6-pin connector is compatible with a TTL-232R-3V3 cable from FTDI (Farnell order code: 1329311). This cable is shown in Fig 7. Fig 7. FTDI TTL-232R-3V3 cable Fig 8 gives the schematic diagram of the electrical isolate debug UART. This connection can both be used for input and output to the design and is not necessary for an end product. Fig 8. Isolated debug UART Interface 3.6 Expansion connector To facilitate the connection of external hardware the expansion connector SV1 is available. The expansion connector can be used to connect external hardware boards for lighting, sensor, HVAC or other control purposes. The connections of the expansion connector are given in Fig 9. All the connections, except ground and power, are directly connected to the microcontroller. The connections available support the usage of the 16-bit timers CTB16B0 and CTB16B1, and the 32-bit timers CT32B0 and CT32B1 for PWM generation. Furthermore, two analog to digital inputs are available; for communication purposes an SPI/SSP or I2C connection is available. AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 9 of 18 AN11231 NXP Semiconductors KNX evaluation board Not all these I/O connections are available simultaneously as the microcontroller uses pin multiplexing to select the specific function of an I/O pin. For detailed information on the pin multiplexing possibilities of the LPC1227 microcontroller see the LPC1227 user manual [2]. Fig 9. Expansion connector AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 10 of 18 AN11231 NXP Semiconductors KNX evaluation board 4. Bill of Materials Table 1. Part Component list Value Device Package Description C1 22pF C0805K CAPACITOR, European symbol C2 22pF C-EUC0805K C0805K CAPACITOR, European symbol C4 100nF C-EUC0805K C0805K CAPACITOR, European symbol C5 100nF C-EUC0805K C0805K CAPACITOR, European symbol C8 470nF/50V C-EUC0805K C0805K CAPACITOR, European symbol C9 10uF/10V/X7R C-EUC0805K C0805K CAPACITOR, European symbol C11 100nF C-EUC0805K C0805K CAPACITOR, European symbol C12 22pF C-EUC0805K C0805K CAPACITOR, European symbol C13 22pF C-EUC0805K C0805K CAPACITOR, European symbol C14 4u7 C-EUC0805K C0805K CAPACITOR, European symbol C15 100nF C-EUC0805K C0805K CAPACITOR, European symbol C16 100nF C-EUC0805K C0805K CAPACITOR, European symbol C24 4n7 C-EUC0805K C0805K CAPACITOR, European symbol C25 100uF/35V CPOL-EUF PANASONIC_F POLARIZED CAPACITOR, European symbol C26 100nF C-EUC0805K C0805K CAPACITOR, European symbol D1 BYG21 DIODEDO214AC DO214AC DIODE 1021748 D2 SMBJ43CA SUPPRESSORSMBJ SMBJ Suppressor diode 1827691 J4 MC9A22-2034 MC9A22-2034 HEADER, RIGHT ANGLE, 20 WAY 1099248 JP10 C-EUC0805K PINHD-2X2 2X02 Farnell 1712595 PIN HEADER TP1 pins and connector 2x 1336225 + 4016014 NPI54C221KTRF 5.8x5.2 NIC Components, SMD non-shielded RS online 740-9619 RED0805 LEDCHIPLED_08 05 CHIPLED_0805 LED (Check Anode/Cathode placement!) 1716768 LED2 GREEN0805 LEDCHIPLED_08 05 CHIPLED_0805 LED 1716766 LED3 GREEN0805 LEDCHIPLED_08 05 CHIPLED_0805 LED 1716766 OK1 H11L2MS H11L2MS DIL6-SMD 6-Pin DIP Optocoupler 1086683 OK2 H11L2MS H11L2MS DIL6-SMD 6-Pin DIP Optocoupler 1086683 Q1 16MHz CRYSTAL4 XTAL4 1712816 Q2 32.768kHz RTCCRYSTAL XTAL2 1278036 R1 27E/1W/2512 R-EU_R2512 R2512 RESISTOR, European symbol, +/- 5% R2 1k0 R-EU_R0805 R0805 RESISTOR, European symbol R3 1k0 R-EU_R0805 R0805 RESISTOR, European symbol R4 nc R-EU_R0805 R0805 RESISTOR, European symbol K1 KNX KNX L5 220uH LED1 AN11231 Application note KNX All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 1265189 © NXP B.V. 2012. All rights reserved. 11 of 18 AN11231 NXP Semiconductors KNX evaluation board Part Value Device Package Description R5 470E R-EU_R0805 R0805 RESISTOR, European symbol R6 1k0 R-EU_R0805 R0805 RESISTOR, European symbol R7 1k0 R-EU_R0805 R0805 RESISTOR, European symbol R8 nc R-EU_R0805 R0805 RESISTOR, European symbol R14 47E R-EU_R0805 R0805 RESISTOR, European symbol R17 10k R-EU_R0805 R0805 RESISTOR, European symbol R18 10k R-EU_R0805 R0805 RESISTOR, European symbol R19 470E R-EU_R0805 R0805 RESISTOR, European symbol R20 470E R-EU_R0805 R0805 RESISTOR, European symbol R26 1E R-EU_R0805 R0805 RESISTOR, European symbol R27 10k R-EU_R0805 R0805 RESISTOR, European symbol B3FS-1000 SWITCHTACT_DTSM-6 OMRON ELECTRONIC COMPONENTS - B3FS-1000 SWITCH, FLAT, SPNO 3121161 B3FS-1000 SWITCHTACT_DTSM-6 OMRON ELECTRONIC COMPONENTS - B3FS-1000 SWITCH, FLAT, SPNO 3121161 B3FS-1000 SWITCHTACT_DTSM-6 OMRON ELECTRONIC COMPONENTS - B3FS-1000 SWITCH, FLAT, SPNO 3121161 SWITCHTACT_DTSM-6 OMRON ELECTRONIC COMPONENTS - B3FS-1000 SWITCH, FLAT, SPNO 3121161 HEADER, RIGHT ANGLE, 20 WAY 1099248 S1 S2 S3 B3FS-1000 B3FS-1000 B3FS-1000 S4 B3FS-1000 B3FS-1000 SV1 MC9A22-2034 MC9A22-2034 SV2 MA06-1 MA06-1 PIN HEADER SV3 MA10-1 MA10-1 PIN HEADER TP1 PINHD-1X1 1X01 PIN HEADER TP2 PINHD-1X1 1X01 PIN HEADER U1 NCN5120 NCN5120 QFN40_6X6_NCN On Semiconductor KNX TP1 5120 transceiver U3 LPC1227FBD48 LPC122XFBD48 SOT313-2 AN11231 Application note NXP ARM Cortex M0 32 bit Microcontroller All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 Farnell 1862476 © NXP B.V. 2012. All rights reserved. 12 of 18 AN11231 NXP Semiconductors KNX evaluation board 5. Device configuration The demo board is programmed with the App_DemoBoardNXP_LPC12xx.hex file to create an example KNX device. Together with an example project for the ETS tool (the manufacturer independent configuration tool from KNX Association), the user can setup a small KNX network using the OM13042 board. The example application file for the microcontroller contains a limited version of the KNX stack from Weinzierl Engineering. For more information on the KNX system stack refer to Weinzierl Engineering [4]. AN11231 Application note Table 2. Accompanying files AN11231 File name Description App_DemoBoardNXP_LPC12xx.hex Flash file for the LPC1227 microcontroller Test_Project_App_Demo_NXP_2012_04_11.pr5 Example project for KNX ETS configuration tool All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 13 of 18 AN11231 NXP Semiconductors KNX evaluation board 6. References AN11231 Application note [1] Product data sheet LPC122x 32-bit ARM Cortex-M0 microcontroller, Rev. 2 — 26 August 2011 http://www.nxp.com/documents/data_sheet/LPC122X.pdf [2] UM10441, LPC1224/25/26/27 User manual, Rev. 2 — 19 September 2011, http://www.nxp.com/documents/user_manual/UM10441.pdf [3] NCN5120 datasheet, Rev.1 – May 2011 On Semiconductors [4] Weinzierl Engineering GmbH, http://www.weinzierl.de/ All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 14 of 18 AN11231 NXP Semiconductors KNX evaluation board 7. Legal information 7.1 Definitions Draft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. 7.2 Disclaimers Limited warranty and liability — Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors. 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Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). NXP does not accept any liability in this respect. Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Evaluation products — This product is provided on an “as is” and “with all faults” basis for evaluation purposes only. NXP Semiconductors, its affiliates and their suppliers expressly disclaim all warranties, whether express, implied or statutory, including but not limited to the implied warranties of noninfringement, merchantability and fitness for a particular purpose. The entire risk as to the quality, or arising out of the use or performance, of this product remains with customer. In no event shall NXP Semiconductors, its affiliates or their suppliers be liable to customer for any special, indirect, consequential, punitive or incidental damages (including without limitation damages for loss of business, business interruption, loss of use, loss of data or information, and the like) arising out the use of or inability to use the product, whether or not based on tort (including negligence), strict liability, breach of contract, breach of warranty or any other theory, even if advised of the possibility of such damages. Notwithstanding any damages that customer might incur for any reason whatsoever (including without limitation, all damages referenced above and all direct or general damages), the entire liability of NXP Semiconductors, its affiliates and their suppliers and customer’s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars (US$5.00). The foregoing limitations, exclusions and disclaimers shall apply to the maximum extent permitted by applicable law, even if any remedy fails of its essential purpose. 7.3 Trademarks Notice: All referenced brands, product names, service names and trademarks are property of their respective owners. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 15 of 18 AN11231 NXP Semiconductors KNX evaluation board 8. List of figures Fig 1. Fig 2. Fig 3. Fig 4. Fig 5. Fig 6. Fig 7. Fig 8. Fig 9. OM 13042 KNX TP1 NCN5120 LPC1227 evaluation board ............................................... 3 Evaluation board overview ................................ 4 Component placement top side ........................ 4 Partitioning of the design .................................. 5 LPC1227 Microcontroller section of the schematic .......................................................... 6 KNX physical layer using OnSemi NCN5120 .... 8 FTDI TTL-232R-3V3 cable ................................ 9 Isolated debug UART Interface ......................... 9 Expansion connector ...................................... 10 AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 16 of 18 AN11231 NXP Semiconductors KNX evaluation board 9. List of tables Table 1. Table 2. Component list ................................................ 11 Accompanying files AN11231 ......................... 13 AN11231 Application note All information provided in this document is subject to legal disclaimers. Rev. 1 — 1 July 2012 © NXP B.V. 2012. All rights reserved. 17 of 18 AN11231 NXP Semiconductors KNX evaluation board 10. Contents 1. 2. 3. 3.1 3.2 3.3 3.4 3.5 3.6 4. 5. 6. 7. 7.1 7.2 7.3 8. 9. 10. Document purpose .............................................. 3 Introduction ......................................................... 3 Hardware .............................................................. 3 Overview ............................................................ 3 PCB overview..................................................... 4 Microcontroller.................................................... 5 KNX physical layer ............................................. 7 Isolated UART interface ..................................... 9 Expansion connector .......................................... 9 Bill of Materials .................................................. 11 Device configuration ......................................... 13 References ......................................................... 14 Legal information .............................................. 15 Definitions ........................................................ 15 Disclaimers....................................................... 15 Trademarks ...................................................... 15 List of figures..................................................... 16 List of tables ...................................................... 17 Contents ............................................................. 18 Please be aware that important notices concerning this document and the product(s) described herein, have been included in the section 'Legal information'. © NXP B.V. 2012. All rights reserved. For more information, visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 1 July 2012 Document identifier: AN11231