MCP79410 - I²C Real-Time Clock/Calendar with EEPROM & SRAM
The MCP79410 general purpose I2C™ compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy.
Using a low-cost 32.768 kHz crystal or other clock source, time is tracked in either a 12-hour 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 multifunction 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 a unique ID in a locked section of EEPROM that can be unlocked and programmed by the end user.
Features
General purpose RTCC with features that target low power and smart energy applications.
- Low power operation
- Vcc min = 1.8 V
- Icc < 5 μA typical dynamic current - Low backup power
- Vbat Min = 1.3 V
- Ibat < 700 nA typical timekeeping & SRAM retention current - Automatic battery switchover with timestamp
- Vcc to Vbat' (power lost)
- Vbat to Vcc (power restored) - Dual alarms with single IRQ Output that operates on Vcc or Vbat
- Clock out frequencies of 32.768, 8.192 & 4.096 kHz and 1 Hz
- Digital trimming range from -127...+127 ppm in 1 ppm steps
- 1 ppm is approximately 86 milliseconds/day - EEPROM has 8 Bytes/Page with block sector write protection
- Protect none, 1/4, 1/2 or all of array - Factory standard or custom ID programming available
