AS8002-AB

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems application note is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com AS8002 Solar Photovoltaic Inverter Measurement IC with Fast Over Current Detection AS8002-AB-1.0 Adapter Board OPERATION MANUAL r The on-chip temperature sensor provides the inverter designer the option of temperature compensation for any of the measured parameters or functional blocks provided, over the full operating temperature range of the device. am lc s on A te G nt st il The AS8002 is a highly accurate measurement IC that allows monitoring the generated energy with low cost shunt resistors or other sensors for the current and resistor dividers for the voltage. This approach allows avoiding more expensive sensing devices while achieving the required accuracy for DC and AC measurements of current and voltage as well as stability over the operating temperature range of the inverter. The 12 Bit ADC is preceded by low noise programmable gain amplifiers in order to accommodate different sensors. The ADC has three multiplexed inputs, offering one secondary channel in addition to the main voltage and current. lv Power inverters in solar photovoltaic systems are often connected directly to the electricity grid in order to inject the created energy into the mains and act as an electricity supplier. This energy must comply with certain regulations that set the standard in terms of quality and safety which requires of accurate measurements. al id General Description The 12 bit ADC samples the voltage and current and provides their instantaneous values through an SPI interface. The on-chip voltage reference is connected to the ADC and to REF. An external crystal oscillator is not required as a high accuracy internal oscillator clock is available. The independent over current interrupt detects a high current on the grid and allows the processor to open the switches without waiting for the ADC conversion. The AS8002 Adapter Board Te ch ni ca The AS8002-AB-1.0 Adapter board allows you an easy-to-use evaluation of the essential functions of the AS8002. It is a system with built-in microcontroller, USB interface and a simple analogue frontend. The complete system is fully supplied by the PC and needs no additional external power supply. In combination with the AS8002-GUI PC software is it possible to evaluate all the basic functions. Revision 1.0, April 2010 Page 1 of 7 www.austriamicrosystems.com/AS5163 AS8002 Adapterboard OPERATIONAL MANUAL Board overview Programming interface for the USB-Microcontroller (not used in the field) USB connector to the PC (backside) AS8002 lv al id Connectors for Interrupt and reference voltages am lc s on A te G nt st il Analog frontend connectors The inputs of the analog frontend are differential. If they are driven from a single ended source it is essential that the source is floating compared to the ground potential of the USB interface which acts as the power supply for the board. AS8002 GUI Software Te ch ni ca The software is developed for a Microsoft Windows XP operating system with Service Pack 2. After installing the “Install.msi” package the AS8002_EvalSW application is ready for use. The GUI works like an Oscilloscope and is able to display the input signals according the selection done in the Input checkboxes. Furthermore the register map information can be displayed. Revision 1.0, April 2010 Page 2 of 7 www.austriamicrosystems.com/AS8002 am lc s on A te G nt st il lv al id AS8002 Adapterboard OPERATIONAL MANUAL Red USB box indicator: Adapterboard is not connected INPUTS Pin Name I0P_V0P I0M_V0M V1P V1M V2P V2M Description Analog Input Channel 0. Positive input of the differential analog input. Analog Input Channel 0. Negative input of the differential analog input. Analog Input Channel 1. Positive input of the differential analog input. Analog Input Channel 1. Negative input of the differential analog input. Analog Input Channel 2. Positive input of the differential analog input. Analog Input Channel 2. Negative input of the differential analog input. GAIN ca The value Controls the gain of the current and voltage channel PGAs: • Gain for current channel is given by the formula • Gain for voltage channel is given by the formula 2*pga_curr_gain+ 2 2*pga_volt_gain + 2 ni Programmable gain amplifiers (apply floating signals only) AMP GAIN ch 0 Gain channel 0 ch I0P_V0P / I0M_V0M Input level 0 AMP GAIN ch1 Gain channel 1 V1P / V1M Input level 1 Programmable MIN 2 Differential, with gain of 64 Programmable 14 2 150 MAX 64 V/V 20 mVP 8 V/V 212 mVP Te Differential, with gain of 6 TYP Revision 1.0, April 2010 Page 3 of 7 www.austriamicrosystems.com/AS8002 AS8002 Adapterboard OPERATIONAL MANUAL INTERRUPT When an over current, an under voltage or an over temperature occurs the bit warning_detected is set to 1 and the Interrupt state is visible in the checkbox. lv Single button activates a single readout of the selected channels Run/Stop activates a continuously readout of the selected channels Triggered check box: displays steady waveform (works only with activated Voltage PGA signal) am lc s on A te G nt st il STATUS INFORMATION f(V) Ipp Vpp °C SRate al id SINGLE / RUN-STOP Button Analog input channel 2 (voltage channel) frequency Analog input channel 1 (current channel) amplitude Analog input channel 2 (voltage channel) amplitude On chip temperature Displays sampling rate per channel SCALING (SLIDE CONTROL) Te ch ni ca The slider controller allows scaling the Z-range of the graph Revision 1.0, April 2010 Page 4 of 7 www.austriamicrosystems.com/AS8002 AS8002 Adapterboard OPERATIONAL MANUAL lv al id Register Map (Shortcut CTRL+M) Available Shortcuts: am lc s on A te G nt st il Read only register map Update register contents toggle HEX/DEC view Te ch ni ca CTRL + U CTRL + V Revision 1.0, April 2010 Page 5 of 7 www.austriamicrosystems.com/AS8002 am lc s on A te G nt st il lv al id AS8002 Demoboard Schematic and Blockdiagram Te ch ni ca AS8002 Adapterboard schematic AS8002 Adapterboard PCB Layout Revision 1.0, April 2010 Page 6 of 7 www.austriamicrosystems.com/AS5163 AS8002 Adapterboard OPERATIONAL MANUAL Revision History Date 1.0 Description First version April 2010 Copyright Disclaimer am lc s on A te G nt st il All products and companies mentioned are trademarks of their respective companies. lv Copyright © 2010, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. 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. al id Revision Te ch ni ca Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. 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