返回Analog Devices Inc.

Analog Devices / Maxim Integrated MAX31914 超低功率转换器

美信 美信 MAX31914 超低功率转换器可转换和调理 24V 传感器和开关的数字输出。它们可产生微控制器能够接受的 5V CMOS 兼容信号，适用于工业、过程控制和楼宇自动化应用。提供可编程逻辑控制器（PLC）数字输入模块的前端接口电路。同时实现信号电平转换、输入限流及低通滤波。与传统的分立电阻分压方案相比，输入限流可大幅度减小现场电源总线的功耗。为实现同类中最低功耗，该集成电路采用正在申请专利的电路技术，在输入限流的基础上进一步降低了功耗。这种特殊的低功耗工作模式在选择片上低通滤波时会自动激活。

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.

特性

  • 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)

应用

  • Digital input modules for Programmable Logic Controllers (PLCs)
  • Industrial automation
  • Building automation
  • Process automation
发布日期: 2015-04-14 | 更新日期: 2023-04-14