Analog Devices / Maxim Integrated MAX31331 Ultra-Low-Power I2C Real-Time Clock

Analog Devices MAX31331 Ultra-Low-Power I2C Real-Time Clock consumes a nominal 65nA timekeeping current, extending battery life. Analog Devices MAX31331 supports a wide range of 32.768kHz crystals. A crystal with any capacitive loading (CL) spec can be used. This feature broadens the pool of usable crystals for this device. The MAX31331 is accessed through an I2C serial interface.

Features

  • Ultra-low-power extends run time
    • 65nA timekeeping current
    • 1.1V to 5.5V timekeeping voltage range
    • Automatic switchover to backup supply on power fail event
    • Trickle charger for external supercapacitor or rechargeable battery
  • Provides flexibility
    • Wide range of external crystals supported (no external loading required)
    • Frequency correction with <0.5ppm resolution
    • 1.62V to 5.5V interface voltage range
  • Small footprint and low BOM
    • 1.66mm x 1.26mm 12-bump WLP
    • 3mm x 3mm 10-pin TDFN
    • No external load capacitors required
  • Value-added features for ease of use
    • Event detection with dedicated Pin
    • Timestamps for various events
    • Low battery voltage detection
    • 1/128 second register
    • Alarms and countdown timer
    • 32-byte user RAM

Applications

  • Medical
  • Wearables
  • Portable instruments
  • Telematics
  • Industrial
  • IoT

Block Diagram

Block Diagram - Analog Devices / Maxim Integrated MAX31331 Ultra-Low-Power I2C Real-Time Clock
Published: 2022-12-06 | Updated: 2023-05-11