Realtime clock/calendars

22 February 2012 Analogue, Mixed Signal, LSI

Microchip has announced a new family of standalone real-time clock/calendar (RTCC) devices.

The MCP795WXX/BXX parts are aimed at applications which include smart-energy products, such as thermostats, power meters and commercial refrigeration; home appliances such as coffee makers, cookers and microwave ovens; automotive dashboard controls, car radios and GPS; office equipment, video systems and other consumer electronics; as well as communications products such as radios, cordless phones and network systems.

The RTCCs feature millisecond alarms and a 10 MHz SPI that supports very fast data access, resulting in longer MCU sleep and power-down modes, as well as less power draw from the battery. Other low-power features include two event-detect inputs that draw minimal current in the RTCC device, but wake the MCU when events such as a switch press or system tampering have occurred. Additionally, the devices include three types of non-volatile memory, EEPROM, SRAM and a unique ID which can be ordered blank, or with a pre-programmed MAC address as a standard product.

In addition to the automatic battery switch­over for backup power, a power-fail timestamp logs the time and duration of any power failure. For accurate timekeeping over a broad temperature range, the devices feature a wide digital trimming range that compensates for crystal frequency drift over temperature. In designs where a second low-frequency crystal is used, a boot-clock option provides a 32 kHz clock at power-up, reducing the need for a second crystal.

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