Microchip Technology has announced availability of its first stand-alone I2CTM real-time clock/calendar (RTCC) family. The six MCP794XX devices (video interview below) include on-chip SRAM (64 Bytes) and can include EEPROM (1 kbits).
Also featured are digital trimming for time-of-day calibration and a battery switchover function that supports backup power at low voltage and current levels. Such integration in a single device lower parts count and cost ($0.64/0.70/0.76 each in 10k quantities).
Applications include automotive (i.e. dashboard controls, radio), smart energy (i.e. thermostats, power meters, and commercial refrigeration), appliances (i.e. stoves, dishwashers, microwave ovens), and commercial and consumer electronics (i.e. office equipment, irrigation controls, and video systems).
Devices such as cameras and notebook computers require a real-time clock with back up to maintain time and alarm settings when their power is turned off. Commercial refrigeration, point-of-sale, and security systems need such functionality with a power-fail monitor to capture and store "timeframes" when main power fails. The on-chip battery switchover circuit and power-fail timestamp on the MCP794XX RTCCs provide these capabilities. Digital trimming supports software temperature compensation, which lowers cost compared to devices where compensation is done in hardware. The devices function over industrial temperatures from -40 to 85C.
RTCC development support includes a daughter board (available in Q1 2011) that is compatible with various Microchip development boards.
For product information and data sheets, click here