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

簡(jiǎn)介

MIC2778屬于集成電路（IC）的監(jiān)控器。由制造生產(chǎn)的MIC2778監(jiān)控器PMIC 監(jiān)控器用于監(jiān)視和/或控制電路中的電壓軌，能夠連接微控制器以維持一定的功率限值。監(jiān)控器類型包括電池備用電路、監(jiān)控器、多電壓監(jiān)控器、電源監(jiān)控器、穩(wěn)壓器/監(jiān)控器、復(fù)位計(jì)時(shí)器、定序器、簡(jiǎn)單復(fù)位/上電復(fù)位、智能開/關(guān)控制器、系統(tǒng)管理器、電壓檢測(cè)器和看門狗電路。