The BD4924G is a voltage detector IC manufactured by Rohm Semiconductor, categorized as a PMIC (Power Management Integrated Circuit) supervisor. Its primary function is to monitor the supply voltage of electronic circuits and generate a reset signal when the voltage drops below a specific threshold. This is a critical feature for preventing malfunctions and data corruption in microcontrollers and other digital circuits caused by voltage sags or brownout conditions, thus ensuring system stability and reliable operation.

Applications

• Microcontroller Systems: Provides a reliable reset signal during power-up and power-down sequences, preventing erratic behavior.
• Memory Devices: Protects data stored in volatile memory (RAM) by ensuring proper reset during voltage drops.
• Portable Electronics: Used in smartphones, tablets, and other battery-powered devices to monitor battery voltage and prevent low-voltage operation.
• Industrial Automation: Provides voltage monitoring for critical control systems, ensuring reliable operation in industrial environments.
• Automotive Electronics: Monitors voltage levels in automotive ECUs and other electronic systems to ensure safe and reliable operation.

Features

• High-Accuracy Voltage Detection: Offers precise voltage monitoring with a typical accuracy of ±1.5%.
• Low Current Consumption: Minimizes power usage, making it suitable for battery-powered applications.
• Open Drain Output: Provides flexibility in interfacing with different microcontroller and logic systems.
• Small Package Size: Available in compact surface-mount packages for space-constrained applications.
• Hysteresis: Includes hysteresis to prevent oscillations or chattering of the reset signal.

Benefits

• Improved System Stability: Prevents malfunctions and ensures reliable operation of electronic systems.
• Data Protection: Prevents data corruption in memory devices during voltage drops.
• Extended Battery Life: Low power consumption contributes to longer battery life in portable devices.
• Simplified Design: Integrates voltage monitoring and reset functionality into a single chip, simplifying circuit design.
• Enhanced Reliability: Provides reliable voltage monitoring in a wide range of operating conditions.

Additional Details

The BD4924G typically operates with a supply voltage range of 1.6V to 5.5V, making it compatible with various power supply configurations. The reset threshold voltage is factory-set and available in different voltage levels to suit specific application requirements. The operating temperature range is typically from -40°C to +85°C. The output is an open drain type, requiring a pull-up resistor. The hysteresis characteristic helps to prevent false triggering of the reset signal due to noise or minor voltage fluctuations.