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Home » NEWEST Products » New by Manufacturer » Maxim Integrated » MAXREFDES12 Corona Reference Design - Maxim
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Maxim MAXREFDES12 Corona Reference Design

Maxim MAXREFDES12 Corona Reference Design

Maxim MAXREFDES12 Corona Reference Design

Maxim's MAXREFDES12 Corona 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.

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Maxim MAXREFDES12 Corona Reference Design
  • 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
  • Pmod™-compatible form factor
  • Building automation
  • Digital input modules for PLCs
  • Industrial automation
  • Motor control
  • Process automation
Block Diagram
Block Diagram

Maxim MAX31911 Industrial Interface Translator/Serializer

Maxim's MAX31911 Industrial Interface Translator/Serializer translates, conditions, and serializes the 24V digital output of sensors and switches used in industrial, process, and building automation to 5V CMOS-compatible signals required by microcontrollers. It provides the front-end interface circuit of a programmable logic controller (PLC) digital input module. The device features integrated current limiting, lowpass filtering, and channel serialization. Input current limiting allows a significant reduction in power consumed from the field voltage supply as compared to traditional discrete resistor-divider implementations. Selectable on-chip lowpass filters allow flexible debouncing and filtering of sensor outputs based on the application. On-chip serialization allows a drastic reduction in the number of optocouplers used for isolation. The device serializer is stackable so that any number of input channels can be serialized and output through only one SPI-compatible port. This reduces the number of optocouplers needed to only three, regardless of the number of input channels. For enhanced robustness with respect to high-frequency noise and fast electrical transients, a multibit CRC code is generated and transmitted through the SPI port for each 8 bits of data. The on-chip 5V voltage regulator can be used to power external optocouplers, digital isolators, or other external 5V circuitry.

Maxim MAX31911 Industrial Interface Translator/Serializer
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  • Eight High-Voltage Input Channels (36V max)
  • Configurable for IEC 61131-2 Input Types 1, 2, 3
  • Wide Operating Supply Range of 7V to 36V
  • Optional Configuration Allows 5V Supply
  • Selectable Input Filtering and Debouncing from 0ms to 3ms
  • Configurable Input Current Limiting from 0.5mA to 6mA
  • High HBM ESD Immunity on All Field Input Pins
  • On-Chip 8-to-1 Serialization with SPI Interface
  • On-Chip 5V Regulator
  • Overtemperature Indicator
  • On-Chip 24V Field Supply Voltage Monitor
  • Low Quiescent Current and Power Dissipation
  • Multibit CRC Code Generation and Transmission for Error Detection and
    More Reliable Data Transmission to an External Micro
  • Building Automation
  • Digital Input Modules for PLCs
  • Industrial Automation
  • Motor Control
  • Process Automation
Block Diagram

Maxim MAX14850 Six-Channel Digital Isolator

Maxim's MAX14850 Six-Channel Digital Isolator utilizes Maxim's proprietary process technology, whose monolithic design provides a compact and low-cost transfer of digital signals between circuits with different power domains. The technology enables low power consumption and stable high-temperature performance. The four unidirectional channels are each capable of DC to 50Mbps, with two of the four channels passing data across the isolation barrier in each direction. The two bidirectional channels are open drain and each is capable of data rates from DC to 2Mbps. Independent 3.0V to 5.5V supplies on each side of the isolator also make it suitable for use as a level translator. The MAX14850 can be used for isolating SPI busses, I²C busses with clock stretching, RS-232, RS-485/RS-422 busses, and general-purpose isolation. When used as a bus isolator, extra channels are available for power monitoring and reset signals.

Maxim MAX14850 Six-Channel Digital Isolator
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  • Protection from High-Voltage Environments
  • 600VRMS Isolation for 60 Seconds
  • Short-Circuit Protection on Unidirectional Outputs
  • Complete Digital Isolation Solution
  • Four Unidirectional Signal Paths: 2-In/2-Out
  • Two Bidirectional Open-Drain Signal Paths
  • 50Mbps (max) Unidirectional Data Rate
  • 2Mbps (max) Bidirectional Data Rate
  • Compatible with Many Interface Standards
  • I²C With Clock Stretching
  • SPI
  • RS-232, RS-422/RS-485
  • SMBus, PMBus Interfaces
  • Battery Management
  • I²C, SPI, SMBus, PMBus™ Interfaces
  • Industrial Control Systems
  • Isolated RS-232, RS-485/RS-422
  • Medical Systems
  • Telecommunication Systems

Operating Circuit

Maxim MAX13256 H-Bridge Transformer Driver

Maxim's MAX13256 H-Bridge Transformer Driver provides a simple solution for making isolated power supplies up to 10W. The device drives a transformer’s primary coil with up to 300mA of current from a wide 8V to 36V DC supply. The transformer’s secondary-to-primary winding ratio defines the output voltage, allowing selection of virtually any isolated output voltage. The device features adjustable current limiting, allowing indirect limiting of secondary-side load currents. The current limit of the MAX13256 is set by an external resistor. A FAULT output asserts when the device detects an overtemperature or overcurrent condition. In addition, the device features a low-power mode to reduce the overall supply current to 0.65mA (typ) when the driver is not in use. The device can be operated using the internal oscillator or driven by an external clock to synchronize multiple MAX13256 devices and precisely set the switching frequency. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer, regardless of which clock source is used.

  • Simple, Flexible Design
  • 8V to 36V Supply Range
  • Up to 90% Efficiency
  • Provides Up to 10W to the Transformer
  • Undervoltage Lockout
  • 2.5V to 5V Compatible Logic Interface
  • Adjustable Overcurrent Threshold
  • Integrated System Protection
  • Fault Detection and Indication
  • Overcurrent Limiting
  • Overtemperature Protection
  • Small 10-Pin TDFN Package (3mm x 3mm)
  • Power Meters
  • Isolated Fieldbus Interfaces
  • 24V PLC Supply Isolation
  • Medical Equipment
  • Motor Controls
Functional Diagram
Functional Diagram

Maxim MAX13256EV Evaluation Kit

Maxim's MAX13256EV Evaluation Kit is a fully assembled and tested PCB that contains the MAX13256 10W isolated H-bridge DC-DC converter. The EV kit operates from an 8V to 36V DC power source and the on-board 1:1 turns-ratio transformer from HALO sets the output voltage range from 6.8V to 34.8V with a 300mA current limit. The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. Input-ripple current and radiated noise are minimized by the inherent balanced nature of the design with no interruption in the input current. Undervoltage lockout (UVLO), adjustable current limit, and thermal shutdown provide for a robust 10W isolated supply. The surface-mount transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.

Maxim MAX13256EV Evaluation Kit
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  • 8V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Bipolar Half-Wave
    Rectifier, and Push-Pull Rectifier Outputs

  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested
 Maxim Control & Automation

View More About Maxim MAX31911 Industrial Interface Translator/Serializer View More About Maxim MAX14850 Six-Channel Digital Isolator View More About Maxim MAX13256 H-Bridge Transformer Driver
  • Maxim Integrated