MAX1232CPA 微处理器监控电路

概述

The MAX1232 microprocessor (µP) supervisory circuit provides µP housekeeping and power-supply supervision functions while consuming only 1/10th the power of the DS1232. The MAX1232 enhances circuit reliability in µP systems by monitoring the power supply, monitoring the software execution, and providing a debounced manual reset input. The MAX1232 is a plug-in upgrade of the Dallas DS1232.

A reset pulse of at least 250ms duration is supplied on power-up, power-down, and low-voltage brownout conditions (5% or 10% supply tolerances can be selected digitally). Also featured is a debounced manual reset input that forces the reset outputs to their active states for a minimum of 250ms. A digitally programmable watchdog timer monitors software execution and can be programmed for timeout settings of 150ms, 600ms, or 1.2s. The MAX1232 requires no external components.

关键特性 应用 Consumes 1/10th the Power of the DS1232 Precision Voltage Monitor—Adjustable +4.5V or +4.75V Power-OK/Reset Pulse Width—250ms Min No External Components Adjustable Watchdog Timer—150ms, 600ms, or 1.2s Debounced Manual Reset Input for External Override Available in 8-Pin PDIP/SO and 16-Pin Wide SO Packages

汽车系统

计算机

控制器

高精度µP电源监视

智能仪表

Key Specifications: Microprocessor Supervisors Part Number Number of Monitored Voltages Reset Threshold Range (V) Active-Low Reset Output Active-High Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Supervisor Features Reset Thresh. Acc. (% at +25°C) Max. ICC (µA) Package Package Type Operating Temp. Range (°C) MAX1232 1 3.3 to 5.5 Open Drain Open Drain 85ms to 300ms Input (WDI) 1s to 2s <1s adjustable Manual Reset 2.5 200.0 8/PDIP

8/SOIC

16/SOIC Plastic DIP SOIC -40 to +85 -55 to +125 0 to +70

注释 Microprocessor Monitor with Watchdog

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