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Application Report
SNOA564F–June 2011–Revised December 2012
AN-2154 RD-195 DC Arc Detection Evaluation Board
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ABSTRACT
The RD-195 reference design includes the SM73201-ARC-EV PCB which is a UL1699B compliant Photo-
Voltaic Arc Detect System with a minimal footprint of less than 50mm x 30mm. The reference design
utilizes a proprietary dynamic filtering technique to effectively detect the signature of arcing conductors in
the presence of highly noisy real world environments. The analog path requires less than 50mW of power
to implement the active filtering. The operation range of the device covers the industrial temperature range
of -40°C to +85°C.
Contents
1 Introduction .................................................................................................................. 3
2 Features ...................................................................................................................... 3
3 Connection ................................................................................................................... 3
4 Quick Setup Procedure .................................................................................................... 4
5 LED functionality ............................................................................................................ 4
6 RS232 Interface Operation ................................................................................................ 4
7 RS232 Settings .............................................................................................................. 4
8 RS232 Commands .......................................................................................................... 5
9 Complete List of RS232 Commands ..................................................................................... 5
10 Raw Data Capture .......................................................................................................... 6
11 Theory of Operation ........................................................................................................ 6
12 System Implementation .................................................................................................... 7
13 Installation .................................................................................................................... 7
14 Design Description .......................................................................................................... 8
15 Differentiation of Series and Parallel Arcing Events .................................................................. 10
16 Safety ....................................................................................................................... 11
17 Bench Evaluation Procedure ............................................................................................. 11
18 Arc Detection Library Structure .......................................................................................... 14
19 Using the Arc Detection Library ......................................................................................... 15
20 Structure of the Code ..................................................................................................... 16
21 Benchmarks ................................................................................................................ 20
22 Other Resources ........................................................................................................... 20
23 Layout ....................................................................................................................... 21
24 Bill of Materials ............................................................................................................. 22
List of Figures
1 Evaluation board ............................................................................................................ 3
2 Spectrum of Digitized Current on SM73201............................................................................. 7
3 System Diagram ............................................................................................................ 7
4 System Insertion ............................................................................................................ 8
5 Board Connection........................................................................................................... 8
6 Analog Front End ........................................................................................................... 9
7 Reference voltage........................................................................................................... 9
8 Self Test Circuit............................................................................................................ 10
9 A/D Converter.............................................................................................................. 10
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SNOA564F–June 2011–Revised December 2012 AN-2154 RD-195 DC Arc Detection Evaluation Board
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