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Analog Devices / Maxim Integrated MAX31914 Ultra-Low Power Translator

Analog Devices Inc. MAX31914 Ultra-Low Power Translator translates and conditions the 24V digital output of sensors and switches. These devices are used in industrial, process, and building automation with 5V CMOS-compatible signals required by microcontrollers. These provide the front-end interface circuit of a programmable logic controller (PLC) digital input module.

The signal voltage translation is performed in conjunction with input current limiting and low-pass filtering. Input current limiting allows a significant reduction in power consumed from the field-supply voltage, as compared to traditional discrete resistor-divider implementations.

To achieve the lowest in-class power dissipation, the ADI MAX31914 uses patent-pending circuit techniques to achieve further reduction of power dissipation beyond what is possible by input current limiting alone. This special low-power operating mode is automatically activated when on-chip low-pass filtering is selected.

Features

  • Flexible supply options enables usage in 24V, 12V, and 5V supplied systems
    • 7V to 36V wide operating field-supply range
    • Device can be optionally powered from the logic-side using a 5V supply
  • Low power and low heat dissipation
    • Very low quiescent current
    • Extremely accurate and stable input current limiters
    • Special ultra-low-power operating mode with switched current limiters
  • Configurability enables a wide range of standard and custom applications
    • Configurable inputs for IEC 61131-2 input types 1, 2, and 3 or for standard CMOS logic levels
    • 0.5mA to 6mA configurable input current limiting
    • Selectable input filtering and debounce (0, 25μs, 0.75ms, and 3ms settings)
  • High integration reduces BOM count and board space
    • 8 High-voltage input channels (36V max.)
    • 8 CMOS logic outputs for high-speed simultaneous transfer of all input states to the controller
    • On-chip 5V regulator
    • On-chip overtemperature indicator
    • On-chip field-supply voltage monitor
    • High HBM ESD immunity on all field input pins (15kV HBM)

Applications

  • Digital input modules for Programmable Logic Controllers (PLCs)
  • Industrial automation
  • Building automation
  • Process automation

Evaluation Kit

Analog Devices / Maxim Integrated MAX31914 Evaluation Kit

Provides the hardware necessary to evaluate the MAX31914 industrial octal digital input translators.

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Published: 2015-04-14 | Updated: 2023-04-14