The MCP79412-I/SN is a general purpose I2C?Compatible Real-Time Clock/Calendar (RTCC) is highly integrated with non-volatile memory. This features a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. Using a 32.768kHz crystal or other clock source, time is tracked in either a 12 or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multi-function open drain output can be programmed as an alarm out or as a clock out that supports 4 selectable frequencies. In addition, non-volatile memory is included along with an unique ID in a locked section of EEPROM that is factory programmed with an EUI-48 MAC address.
- Leap year compensated to 2399
- On-chip digital trimming/calibration - 1PPM resolution, ±129PPM range
- Dual programmable alarms
- Versatile output pin - Clock output with selectable frequency
- Power-fail time-stamp - time logged on switchover to and from battery backup
- 2-wire serial interface
- 64-byte battery-backed SRAM
- 1kb EEPROM Memory
- 64-bit protected EEPROM area - robust write unlock sequence
- Low typical timekeeping current
- Automatic switchover to battery backup
- Programmable charge current
- Programmable safety charge timers
- Preconditioning of deeply depleted cells
- Automatic end-of-charge control
- Charge status output for direct LED drive
- Automatic power-down when input power removed
时钟与计时, 电源管理, 消费电子产品, 车用
