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微处理器监控电路

工业标准、功能完备的µP监控电路

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主要特征

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数据资料 微处理器监控电路 Apr 03, 2015

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参量

主要特征

  • Precision Supply Voltage Monitor:
    • 4.65V for MAX690A/MAX802L/MAX805L
    • 4.40V for MAX692A/MAX802M
  • Reset Time Delay: 200ms
  • Watchdog Timer: 1.6s Timeout
  • Battery-Backup Power Switching
  • 200µA Quiescent Supply Current
  • 50nA Quiescent Supply Current in Battery-Backup Mode
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M)
  • Guaranteed Active-Low RESET Assertion to VCC = 1V
  • 8-Pin SO and DIP Packages

应用/用途

  • 电池供电计算机/控制器
  • 精确的µP监控
  • 智能仪表

描述

The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These parts provide four functions:
1) A reset output during power-up, power-down, and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic.
3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec.
4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V.

The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of active-low RESET.

All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.

简化框图

MAX690A、MAX692A、MAX802L、MAX802M、MAX805L:典型工作电路 MAX690A、MAX692A、MAX802L、MAX802M、MAX805L:典型工作电路 Zoom icon

Technical Docs

数据资料 微处理器监控电路 Apr 03, 2015

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心