MCP7940M-I/SN

MCP7940M-I/SN is a 1.8V - 5.5V I2C™ serial low-cost I2C real-time clock/calendar with SRAM. It tracks time using internal counters for hours, minutes, seconds, days, months, years, and day of week. Alarms can be configured on all counters up to and including months. For usage and configuration, the MCP7940M supports I2C communications up to 400KHz. The open-drain, multi-functional output can be configured to assert on an alarm match, to output a selectable frequency square wave, or as a general purpose output. On-chip digital trimming can be used to adjust for frequency variance caused by crystal tolerance and temperature.

• Leap year compensated to 2399, 12/24 hour modes
• Oscillator frequency is 32.768KHz typ (VCC = +1.8V to 5.5V, TA = -40°C to +85°C)
• On-chip digital trimming/calibration: ±1 PPM resolution, ±129 PPM range
• Dual programmable alarms
• Versatile Output Pin: clock output with selectable frequency, alarm output, general purpose output
• Timekeeping current is 1.2µA typ (VCC = 3.3V, VCC = +1.8 to 5.5V, TA = -40 to +85°C)
• 64-byte SRAM, 2-Wire serial interface, I2C compatible, I2C clock rate up to 400KHz
• Output leakage current is ±1µA (VOUT = VSS or VCC, VCC = +1.8 to 5.5V, TA = -40 to +85°C)
• Oscillator timeout period is 1ms min (VCC = +1.8V to 5.5V, TA = -40°C to +85°C)
• 8 pin SOIC package, industrial operating temperature range from -40 to 85°C