MIC2778中文资料Voltage Monitor with Adjustable Hysteresis数据手册Microchip规格书

描述 Description

The MIC2779 is a voltage monitor--uniquely designed to detect two separate voltage thresholds--combined with a delay generator and logic. It is designed for monitoring the battery supply of portable digital systems, particularly PDAs,pagers, and cellular telephones.High and low voltage thresholds can be adjusted independently, allowing for wide hysteresis. Voltage detection thresholds are accurate to 2%.If the battery voltage falls below the low-voltage threshold, the output /RST or RST is asserted and latched, preventing system operation until the battery is replaced or recharged. Internal logic prevents the output from chattering due to batteryrecovery or load removal. The output is asserted for 140ms (minimum) when a fresh battery is inserted. For applications requiring open-drain output, see MIC2778/MIC833.The IC's power supply input is separate from the detector inputs, allowing the MIC2779 to be powered from a downstream supply, such a boost converter. Supply current is extremely low (1µA, typical), making it ideal for portableapplications. A high-precision 1% grade is available. The MIC2779 is supplied in IttyBitty™ 5-lead SOT-23-5 package.

特性 Features

• Optimized for PDAs, cellular telephones, pagers, and other battery-powered devices
• Independently adjustable high- and low-voltage thresholds
• Internal logic prevents battery-voltage-fluctuation chatter
• High ±2% voltage threshold accuracy; 1% available
• Built in 140ms (minimum) delay deglitches output
• Extremely low 1µA typical supply current
• For applications requiring open-drain output, see MIC2778/MIC833
• Immune to brief power supply transients
• 5-lead SOT-23 package

简介

MIC2778属于集成电路（IC）的监控器。由制造生产的MIC2778监控器PMIC 监控器用于监视和/或控制电路中的电压轨，能够连接微控制器以维持一定的功率限值。监控器类型包括电池备用电路、监控器、多电压监控器、电源监控器、稳压器/监控器、复位计时器、定序器、简单复位/上电复位、智能开/关控制器、系统管理器、电压检测器和看门狗电路。