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Maxim > Design Support > Technical Documents > Sub-System Boards > APP 5611

Keywords: Corona, MAXREFDES12, subsystem reference design, digital input translator/serializer, digital input modules, PLC, home

automation, industrial automation, process automation, motor control, isolated power and data

SUB-SYSTEM BOARD 5611

Corona (MAXREFDES12#): Isolated Industrial Octal Digital

Input Translator/Serializer

May 20, 2013

Abstract:

This document explains

how the Corona (MAXREFDES12#) subsystem reference design provides a compact and simple

isolated digital input interface for industrial control and automation applications. Hardware and firmware design files are provided.

Introduction

In industrial control, industrial automation,

motor control, and process automation

applications, binary/digital sensors and

switches are frequently required. Systems

often need many optocouplers for isolating

each sensor channel. The Corona

(MAXREFDES12#) subsystem reference

design provides the front-end interface circuit

of a programmable logic controller (PLC)

digital input module. The serialization feature allows a large reduction in the number of optocouplers used for isolation. The

reference design accepts high-voltage inputs (36V, max) and features isolated power and data—all integrated into a small form

factor. The Corona design integrates an octal, digital input translator/serializer (MAX31911), a data isolation device (MAX14850),

and an H-bridge transformer driver for isolated power supply (MAX13256). The Corona digital input circuit solution is mainly targeted

for digital input modules for PLCs, industrial automation, process automation, and motor control applications.

Figure 1. The Corona subsystem design block diagram.

Page 1 of 6

Summary of content (6 pages)

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Maxim > Design Support > Technical Documents > Sub-System Boards > APP 5611 Keywords: Corona, MAXREFDES12, subsystem reference design, digital input translator/serializer, digital input modules, PLC, home automation, industrial automation, process automation, motor control, isolated power and data SUB-SYSTEM BOARD 5611 Corona (MAXREFDES12#): Isolated Industrial Octal Digital Input Translator/Serializer May 20, 2013 Abstract: This document explains how the Corona (MAXREFDES12#) subsystem reference design p
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Features Applications Eight high-voltage input channels (36V, max) On-chip 8-to-1 serialization with SPI interface On-chip 5V regulator Isolated power and data Small printed circuit board (PCB) area Device drivers Example C source code Building automation Digital input modules for PLCs Industrial automation Motor control Process automation Pmod™-compatible form factor Detailed Description of Hardware The Pmod specification allows for both 3.3V and 5V modules as well as various pin assignments.
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secondary turns ratio plus an external on-board full bridge rectifier. The MAX14850 (U3) accomplishes data isolation. On the Pmod side, the voltage supply can be 3.3V or 5V. (The Pmod power output for both the Nexys 3 and ZedBoard platforms is fixed at 3.3V.) On the MAX31911 side, the voltage supply is 5V. The combined power and data isolation achieved is 600V RMS . To use the on-board isolation circuits, move the shunt on jumper JU1 to the 1–2 position and apply 7.
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placed inside a Xilinx Zynq system-on-chip (SoC). The FPGA project files for the ZedBoard platform are located under Firmware Files in the All Design Files section. The firmware is a working example of how to initiate the system and continuously read and display the MAX31911 register values. The simple process flow is shown in Figure 3. The firmware is written in C using the Xilinx SDK tool, which is based on the Eclipse open source standard.
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and TP4 input power connectors. 24V is applied on channel 2 and channel 8 of the digital inputs. All other digital inputs are grounded. The OLED shows the register value as 0x8218. The LD7 (corresponding to input channel 8) and LD1 (corresponding to input channel 2) LEDs are lit up. Figure 4. The Corona subsystem lab operation on the ZedBoard platform. All Design Files Download all design files. Hardware Files Schematic Bill of materials (BOM) PCB layout PCB Gerber PCB CAD (PADS 9.
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Nexys is a trademark of Digilent Inc. Pmod is a trademark of Digilent Inc. Spartan is a registered trademark of Xilinx, Inc. Windows is a registered trademark and registered service mark of Microsoft Corporation. Xilinx is a registered trademark and registered service mark of Xilinx, Inc. ZedBoard is a trademark of ZedBoard.org. Zynq is a registered trademark of Xilinx, Inc.