UPD4991AGS-A

The Renesas UPD4991AGS-A is a Real-Time Clock (RTC) integrated circuit designed for precise timekeeping with ultra-low power consumption. This device accurately tracks seconds, minutes, hours, day, date, month, and year, including automatic leap-year adjustments. A key feature is its integrated 32.768 kHz crystal oscillator, which eliminates the need for external timing components, simplifying board design and reducing component count.

The UPD4991AGS-A offers flexible alarm functions, a programmable timer, and a selectable square-wave output. This output can be used to drive external microcontrollers or signal system wake-up events. Communication with the host system is handled via a standard I2C or SPI serial bus. The IC also supports event timestamping and battery backup functionality, ensuring continuous operation even during power outages.

Packaged in a PDSO format, this RTC is suitable for various embedded applications requiring reliable timekeeping. Its design considerations focus on low power usage and integration, making it an efficient choice for battery-powered devices and systems where accurate time is critical.