The BD4928G is a voltage detector IC manufactured by Rohm Semiconductor. It serves as a voltage supervisor, monitoring the input voltage and providing a reset signal to a microcontroller or other digital circuit if the voltage drops below a specific threshold.
Applications
- Microcontroller Reset Circuits: Used to reliably reset microcontrollers during power-up or brownout conditions.
- CPU Reset Circuits: Provides a reset signal to CPUs in embedded systems.
- Power Supply Monitoring: Continuously monitors power supply output voltages.
- Battery-Powered Devices: Protects battery-powered devices from operating under low-voltage conditions.
- Industrial Control Systems: Monitors critical voltage rails in industrial automation equipment.
Features
- Accurate Detection Voltage: Provides a precise threshold for detecting undervoltage conditions.
- Open Drain Output: Offers flexibility in interfacing with different logic levels.
- Low Current Consumption: Minimizes the load on the power supply being monitored.
- Small Package: Comes in a compact package to conserve board space.
- Hysteresis: Prevents spurious resets due to voltage fluctuations near the threshold.
Benefits
- Improved System Stability: Enhances system stability by ensuring a proper reset during voltage drops.
- Enhanced System Reliability: Increases overall system reliability by protecting against undervoltage-related issues.
- Simplified Design: Simplifies the design of reset circuits, requiring minimal external components.
- Cost-Effective Solution: Offers a cost-effective way to improve system reliability.
- Data Protection: Safeguards data by ensuring the system is reset before the voltage drops too low for reliable operation.
Additional Details
The BD4928G typically requires an external pull-up resistor on its open-drain output. The detection voltage is a key parameter and must be chosen based on the system's voltage requirements. The datasheet provides detailed information on the detection voltage, timing characteristics, and application circuit examples.
