The RA-8581SA:B is a Real-Time Clock (RTC) module manufactured by Epson Electronics America Inc-Semiconductor Div. It is designed to provide accurate timekeeping for various electronic systems, even when the main power is off. The module includes a crystal oscillator, RTC core, and interface logic in a compact package.

Applications

• Industrial control systems (time stamping of events, scheduling tasks)
• Data loggers (recording time and date of measurements)
• Point-of-sale (POS) terminals (transaction time keeping)
• Medical devices (accurate timing for critical operations)
• Consumer electronics (clocks, timers, and alarms in appliances)

Features

• I2C interface
• Low power consumption
• Integrated crystal oscillator
• Automatic backup power switchover
• Programmable alarm function
• Time and date registers
• Compact package

Benefits

• Accurate timekeeping even with power loss
• Easy to interface with microcontrollers
• Minimal power consumption for battery-powered applications
• Reduced board space due to integrated components
• Reliable operation in a wide range of temperatures
• Simplified system design
• Programmable features for flexible timing solutions

Additional Details

The RA-8581SA:B utilizes an I2C interface for communication with a host microcontroller. It features automatic switchover to a backup power source (e.g., a coin cell battery) in case of main power failure, ensuring continuous timekeeping. The integrated crystal oscillator contributes to the module's high accuracy. The ':B' suffix might indicate a specific package type or revision. Consult the Epson datasheet for the complete specifications, including power requirements, timing accuracy, and package dimensions.