The BQ4845S-A4G4 is a state-of-the-art Real-Time Clock (RTC) module from Texas Instruments, designed for a wide range of applications requiring time and date information. This integrated circuit provides a full binary-coded decimal (BCD) clock/calendar, programmable alarms, timer functions, and a battery-backed non-volatile (NV) RAM.

Key Features

• Real-Time Clock/Calendar: Tracks time in hours, minutes, and seconds. The calendar functionality accounts for days, weeks, months, and years, including corrections for leap years.
• Programmable Alarms: Features alarms that can be set to trigger on a specific time, date, or day of the week, enabling users to create reminders or initiate system functions.
• Battery Backup: The BQ4845S-A4G4 includes a battery input pin, providing backup power to maintain timekeeping and retain RAM data during main power loss.
• Non-Volatile RAM: Offers 114 bytes of non-volatile RAM, ensuring data retention without power and eliminating the need for an external NV RAM and backup battery.
• Power Management: The device includes automatic power-fail detection and switch circuitry that ensures a seamless transition to backup power.
• Interface: Easy interfacing with microprocessors is possible through a multiplexed byte-wide interface, enhancing the flexibility of the module.

Applications

The BQ4845S-A4G4 is ideal for a variety of applications that require accurate timekeeping, data retention, and reliable operation under varying power conditions. These applications include:

• Telecommunication systems
• Industrial control systems
• Data loggers
• Personal computers
• Embedded systems

Technical Specifications

The BQ4845S-A4G4 from Texas Instruments represents a robust and versatile solution for timekeeping and data retention in critical systems, ensuring performance and reliability.