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Microchip expands stand-alone Real-Time Clock/Calendar device family

15th November 2011

ES Admin

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Microchip announces a new family of stand-alone Real-Time Clock/Calendar (RTCC) devices. The MCP795WXX/BXX RTCC devices have a 10 MHz SPI, non-volatile memory and an effective combination of features at a price lower than most competitors’ devices, including those with fewer features. The new devices reduce component counts and costs for 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 MCP795WXX/BXX RTCC devices 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, to further reduce component counts and lower costs associated with serialised programming.

In addition to the automatic battery switchover for backup power, a power-fail time-stamp 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.

The MCP795XX SPI RTCC PICtail Plus Daughter Board (AC164147) will be available for purchase in February 2012. The daughter board is compatible with Microchip’s Explorer 16 Development Board (DM240001) and PIC18 Explorer Board (DM183032).

The MCP795WXX/BXX RTCC devices are available in 14-pin SOIC and TSSOP packages.
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