Real-time clock/calendar ICs

19 January 2011 Analogue, Mixed Signal, LSI

Microchip recently débuted its first standalone I²C real-time clock/calendar (RTCC) family. All six MCP794XX devices include ample on-chip EEPROM and SRAM, as well as a user-lockable section of EEPROM for a 64-bit reprogrammable unique ID that can be factory programmed with a MAC address. The devices include digital trimming for time-of-day calibration, and a battery-switchover feature that supports backup power at very low voltage and current levels.

Applications for the MCP794XX include smart energy thermostats, power meters and commercial refrigeration units; home-appliances such as stoves, dishwashers and microwave ovens; automotive dashboard controls and car radios; as well as office equipment, irrigation controls, video systems and other consumer electronic products.

Many applications, such as cameras and notebook PCs, require a real-time clock with backup power to maintain time and alarm settings when the main power is turned off. Other applications, such as commercial refrigeration, point-of-sale equipment and security systems, need a real-time clock with a power-fail monitor to capture and store the timeframes when the main power fails. With their on-chip battery-switchover circuit and power-fail timestamp, the MCP794XX RTCCs help to address system health, safety and security concerns in applications involving the storage of perishable goods, or monitoring access to secure rooms. The devices’ digital trimming feature can support software temperature compensation.

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