MCP794XX
MCP794XX是Microchip推出第一款独立实时时钟/日历（RTCC）系列芯片，一共有6个型号，MCP79410 MCP79411 MCP79412 MCP79400 MCP79401 MCP79402。这是一共低成本器件，具备EEPROM和SRAM、惟一ID、数字微调和电池切换功能。
官方地址：http://www.microchip.com/en_US/technology/realtimeclock/index.html
Versatile Feature Set
- Highly integrated with an automatic battery switchover for backup power
- EEPROM, user SRAM and a unique ID with a MAC Address in a single device
- Wide voltage range supports low power, but also operates in 5 volt systems
- Serial interface for easy communications to any MCU
Innovative Peripherals
- Unique ID can be unlocked by user
- Digital trimming has wide adjustment range
- Battery switchover includes a time stamp
Low Power
- Low operating voltage and current levels
- Lower levels after switchover from Vcc to Vbat
- Vbat timekeeping current < 700 nA
Quick Time to Market
- I2C™ interface
- 8-pin industry standard pinout
- Microchip standard development boards
Programming Options
- No Programming: Blank ID (User programmed)
- Factory Standard: MAC Address
- Factory Custom: ID supplied by customer
数据手册下载：I2C™ Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover
