Microchip | MIC2779L-2YM5-TR

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 battery recovery or load removal. The output is asserted for 140 ms (minimum) when a fresh battery is inserted.

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 140 ms (minimum) delay deglitches output
• Extremely low 1 μA typical supply current
• For applications requiring open-drain output, see MIC2778/MIC833
• Immune to brief power supply transients
• 5-pin SOT-23 package

Applications :

• PDAs
• Pagers
• Cordless phones
• Consumer electronics
• Embedded controllers
• Personal electronics