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RTCC devices feature 10MHz SPI interface

Posted: 18 Nov 2011     Print Version  Bookmark and Share

Keywords:RTCC  SPI interface  non-volatile memory 

Microchip Technology Inc. expands family of stand-alone Real-Time Clock/Calendar (RTCC) devices with MCP795WXX/BXX RTCC devices that offer non-volatile memory and an effective combination of features at a price lower than most competitors' devices, including those with fewer features.

The devices reduce component counts and costs for applications in the smart-energy (e.g., thermostats, power meters and commercial refrigeration); home-appliance (e.g., coffee makers, stoves and microwave ovens); automotive (e.g., dashboard controls, car radios and GPS); consumer-electronic (e.g., office equipment and video systems); and communications markets (e.g., radios, cordless phones, and network systems), among others.

MCP795WXX/BXX RTCC devices

Microchip expands stand-alone real-time clock/calendar device family.

The MCP795WXX/BXX RTCC devices feature millisecond alarms and a 10MHz SPI interface that supports very fast data access, resulting in longer MCU sleep and power-down modes, and 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. Along with the automatic battery switchover for backup power, a power-fail time stamp logs the time and duration of any power failure and, for accurate timekeeping over a broad temperature range, the devices claim to 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 offers a 32kHz clock at power-up, reducing the need for a second crystal.

"With our new SPI RTCC devices, we offer customers a high-quality timekeeping solution that also meets many of their other system requirements," said Randy Drwinga, vice president of Microchip's Memory Products Division. "We made this possible by leveraging Microchip's core competencies and integrating an effective combination of features into a single device at a lower cost, which can be passed on to our customers."

The MCP795XX SPI RTCC PICtail plus daughter board (part # AC164147) will be available for purchase in February 2012, at microchipDIRECT ( The board will work with Microchip's Explorer 16 Development Board (part # DM240001) and PIC18 Explorer Board (part # DM183032) to enable designers to demonstrate the MCP795WXX/BXX RTCC devices in their applications.

The MCP795WXX RTCC devices are available today in 14-pin SOIC and TSSOP packages. The MCP795BXX devices will be available in mid-December in the same package options. Both devices are available in 10,000-unit quantities. Samples can be ordered today, at microchip website. Volume-production quantities of the devices can be purchased today, at microchipDIRECT (

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