M41T82 - ST Microelectronics

M41T82 Serial I2C bus real-time clock

. . . . 6 2 Operation . . . . 12 2.1 2-wire bus characteristics . 13 2.1.1 Bus not busy . . . . . . . . .

Features

• Ultra-low battery supply current of 365 nA
• Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
  – Much better accuracies achievable using built-in programmable analog and digital calibration circuits
• 2.0 V to 5.5 V clock operating voltage
• Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
• Automatic switchover and reset output circuitry (fixed reference)
  – M41T83S: VCC = 3.00 V to 5.50 V
  – M41T83R: VCC = 2.70 V to 5.50 V
  – M41T83Z: VCC = 2.38 V to 5.50 V
• Serial interface supports I2C bus (400 kHz protocol)
• Progr.