Microchip | MCP79410-I/SN

The MCP79410 series 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:

• 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 to +127ppm in 1ppm 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