Application Note: AS8510 - AN03 - Copper Mini Shunt AS8510 AN03 – Copper Mini Shunt www.ams.com Revision 1.0 /28/03/14 page 1/10 AS8510-AN03 Copper Mini Shunt Table of Contents 1 General Description ............................................................................................................. 3 1.1 Kit Content ........................................................................................................................... 3 2 Getting Started ..................................................................................................................... 3 3 Hardware Description........................................................................................................... 4 4 Software Description ............................................................................................................ 5 5 Board Schematics, Layout and BOM ................................................................................... 6 6 Ordering Information .......................................................................................................... 10 Revision History Revision Date Owner Description 1.0 28.03.2014 gheh Initial release www.ams.com Revision 1.0 /15/04/14 page 2/10 AS8510-AN03 Copper Mini Shunt 1 General Description This document describes the Copper-Shunt based current sensor demo which utilizes the AS8510 for current measurement and thermal-coefficient compensation. It is intended for a current range of ~40A operation and 60A maximum. Two measurement paths are provided. The left one uses the AS8510’s internal temperature sensor and the right one uses a fine copper meander trace to sense temperature. 1.1 Kit Content The kit consists of a four layer PCB with all components mounted on the Top Side. Top and bottom are used for routing of digital signals whereas the inner layers transport the current and act as the measurement shunt resistance. Figure 1: AS8510-Copper-Shunt Board Communication is done vie the mini-HDMI Plug on the top side which connects to the USB Interface board and subsequently to the PC via USB. 2 Getting Started To get started setup the USB Interface Board for 3.3V operation as is explained in the according App-Note. Connect the mini HDMI Plug on the left of this board to the micro HDMI Plug of the USB Interface Board. Connect the load across connectors A-B with A being the GND connection. Install the supplied Software. Connect the USB Interface Board to the PC via USB and start the GUI. www.ams.com Revision 1.0 /15/04/14 page 3/10 AS8510-AN03 Copper Mini Shunt 3 Hardware Description C B A Figure 2: PCB Connection Diagram Label Name Description Info A GND Measurement path GND connection AS8510 Temp compensated path B LOAD Measurement path Load connection C HDMI HDMI SPI Connector www.ams.com Connects to the USB Interface Board Revision 1.0 /15/04/14 page 4/10 AS8510-AN03 Copper Mini Shunt 4 Software Description Figure 3: AS8510 GUI Once started the PC GUI will automatically detect the AS8510 Board connected to the USB Interface and show this in the right-bottom field. The Start and Stop buttons will commence measurements respectively stop them. Measured current and temperature is always displayed synchronous with the temperature in blue and current in red. The Temp Correction checkbox enables the temperature correction of the impedance of the copper resistor. In order to get reliable measurement result the sensor has to be calibrated first. Ideally the board is exposed to a known temperature without current and the Temp Offset is changed until the displayed Temperature is correct. Then a known low current ~5A is run through the sensor and the I-Scaling is also changed accordingly. Last but not least the current is run through at a higher temperature and the TK is changed to accommodate for the copper thermal coefficient. All of these values have a rough starting value but will require some tuning for optimal performance. www.ams.com Revision 1.0 /15/04/14 page 5/10 AS8510-AN03 Copper Mini Shunt 5 Board Schematics, Layout and BOM Figure 4: Schematic www.ams.com Revision 1.0 /15/04/14 page 6/10 AS8510-AN03 Copper Mini Shunt Figure 5: Top Layer www.ams.com Revision 1.0 /15/04/14 page 7/10 AS8510-AN03 Copper Mini Shunt Figure 6: Middle Layer www.ams.com Revision 1.0 /15/04/14 page 8/10 AS8510-AN03 Copper Mini Shunt Figure 7: Bottom Layer www.ams.com Revision 1.0 /15/04/14 page 9/10 AS8510-AN03 Copper Mini Shunt Table 1: BOM 6 Ordering Information The AS8510 Copper Shunt demo can be ordered via: Table 2: Ordering Information Ordering Code Productname Materialnumber AS8510-COPPER-SHUNT AS8510-Copper-Shunt Mini Board 000000000990600783 Copyright Copyright © 1997-2014, ams AG, Tobelbader Straße 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. www.ams.com Revision 1.0 /15/04/14 page 10/10