Low-cost RTCCs feature battery switchover, digital trimming and SRAM
Starting at $0.57 each in 10,000-unit quantities, it offers a lower-cost alternative to the existing MCP7941X devices, which feature 1Kbit of EEPROM memory and a 64-bit reprogrammable unique ID.
Example applications include those in the smart-energy (e.g. thermostats, power meters and commercial refrigeration); home-appliance (e.g. stoves, dishwashers and microwave ovens); automotive (e.g. dashboard controls and car radios); and consumer-electronic markets (e.g. office equipment, irrigation controls and video systems), among others.
Many applications, such as cameras and notebook PCs, require a real-time clock with back-up 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 main power fails.
With its on-chip battery-switchover circuit and power-fail timestamp, the MCP7940N RTCC delivers this functionality, helping to address system health, safety and security concerns in applications involving the storage of perishable goods, or the monitoring of access to secure rooms. The digital-trimming feature can support software temperature compensation, which lowers costs in comparison to devices where temperature compensation takes place in hardware. The device’s 64 bytes of SRAM can temporarily store information, which further reduces overall system cost.
Developers can begin designing today with Microchip’s MCP7941x RTCC PICtail Plus Daughter Board, which can also be used with Microchip’s existing MCP794XX family of devices. This daughter board works with Microchip’s Explorer 16 Development Board, PIC18 Explorer Board, PICkit Serial Analyzer, and XLP 16-bit Development Board, all of which are available now.
Availability and Pricing
The MCP7940N RTCC is available in SOIC for $0.57 each, MSOP for $0.60 each, TSSOP for $0.60 each and 2 mm x 3 mm TDFN packages for $0.64 each, in 10,000-unit quantities.
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
The technical storage or access that is used exclusively for statistical purposes.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.