Top

Low-Current, Real-Time Clock with I2C, Power Management, and Integrated Crystal

Low-Current RTC with Crystal Integrated and Small, 5mm x 5mm LGA Package

Product Details

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.6 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 240
Memory Type SRAM
Memory Size (Bytes) 64
Time of Day Alarms 2
Integrated Resonator XTAL
Package/Pins LGA-CU/10
Budgetary
Price (See Notes)
1.33
View Less

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.6 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 240
Memory Type SRAM
Memory Size (Bytes) 64
Time of Day Alarms 2
Integrated Resonator XTAL
Package/Pins LGA-CU/10
Budgetary
Price (See Notes)
1.33

Key Features

  • Increases Battery Life
    • 240nA Timekeeping Current
    • Trickle Charger for External Supercapacitor or Rechargeable Battery
  • Provides Flexible Configurability
    • A Schmitt Trigger Input for Event Detection
    • Programmable Square-Wave Output for Clock Monitoring
    • Two Interrupt Pins for Multiple Wakeup Configurations
    • Clock Input Pin for External Clock Synchronization
  • Saves Board Space
    • Integrated Crystal and Load Capacitors Tuned to ±5ppm Typical Clock Accuracy
    • 5mm x 5mm, 10-Pin LGA Package
  • Value-Added Features for Ease-of-Use
    • +1.6V to +5.5V Operating Voltage Range
    • Two Time-of-Day Alarms
    • Countdown Timer with Repeat and Pause Functions
    • 64-Byte RAM for User Data Storage
  • Integrated Protection
    • Power-on Reset for Default Configuration
    • Automatic Switchover to Backup Battery or Supercapacitor on Power-Fail
    • Lockup-Free Operation with Bus Timeout

Applications/Uses

  • Energy Meters
  • Factory Automation
  • Industrial Equipment
  • IoT Devices
  • Medical Devices
  • Portable Instruments
  • Servers
  • Surveillance Cameras
  • Test and Measurement Equipment

Description

The MAX31329 low-current, real-time clock (RTC) is a timekeeping device that provides timekeeping current in nanoamperes, thus extending battery life. The MAX31329 incorporates an integrated 32.768kHz crystal, which eliminates the need for an external crystal. This device is accessed through an I2C serial interface. The MAX31329 features one digital Schmitt trigger input (DIN) and generates an interrupt output on a falling or rising edge of this digital input. An integrated power-on reset function ensures deterministic default register status upon power-up. Other features include two time-of-day alarms, interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism.

The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format. The MAX31329 also includes a clock input for synchronization. When a reference clock (e.g., 32kHz, 50Hz/60Hz power line, GPS 1pps) is present at the CLKIN pin and the enable external clock input bit (ENCLKIN) is set to 1, the MAX31329 RTC is frequency-locked to the external clock and the clock accuracy is determined by the external source.

The device is available in a lead (Pb)-free/RoHS-compliant, 10-pin, 5mm x 5mm LGA package. The device supports the -40°C to +85°C extended temperature range.

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .