Click here for production status of specific part numbers. 2 MAX31329 Low-Current, Real-Time Clock with I C, Power Management, and Integrated Crystal General Description Benefits and Features The MAX31329 low-current, real-time clock (RTC) is a Increases Battery Life timekeeping device that provides timekeeping current in 240nA Timekeeping Current nanoamperes, thus extending battery life. The Trickle Charger for External Supercapacitor or MAX31329 incorporates an integrated 32.768kHz Rechargeable Battery crystal, which eliminates the need for an external crystal. Provides Flexible Configurability 2 This device is accessed through an I C serial interface. A Schmitt Trigger Input for Event Detection The MAX31329 features one digital Schmitt trigger input Programmable Square-Wave Output for Clock (DIN) and generates an interrupt output on a falling or Monitoring rising edge of this digital input. An integrated power-on Two Interrupt Pins for Multiple Wakeup reset function ensures deterministic default register Configurations status upon power-up. Other features include two time- Clock Input Pin for External Clock of-day alarms, interrupt outputs, a programmable Synchronization square-wave output, and a serial bus timeout Saves Board Space mechanism. Integrated Crystal and Load Capacitors Tuned to The clock/calendar provides seconds, minutes, hours, 5ppm Typical Clock Accuracy day, date, month, and year information. The date at the 5mm x 5mm, 10-Pin LGA Package end of the month is automatically adjusted for months Value-Added Features for Ease-of-Use with fewer than 31 days, including corrections for leap +1.6V to +5.5V Operating Voltage Range year. The clock operates in either 24-hour or 12-hour Two Time-of-Day Alarms format. The MAX31329 also includes a clock input for Countdown Timer with Repeat and Pause synchronization. When a reference clock (e.g., 32kHz, Functions 50Hz/60Hz power line, GPS 1pps) is present at the 64-Byte RAM for User Data Storage CLKIN pin and the enable external clock input bit Integrated Protection (ENCLKIN) is set to 1, the MAX31329 RTC is frequency- Power-on Reset for Default Configuration locked to the external clock and the clock accuracy is Automatic Switchover to Backup Battery or determined by the external source. Supercapacitor on Power-Fail The device is available in a lead (Pb)-free/RoHS- Lockup-Free Operation with Bus Timeout compliant, 10-pin, 5mm x 5mm LGA package. The device supports the -40C to +85C extended Ordering Information appears at end of data sheet. temperature range. Applications Industrial Equipment Test and Measurement Equipment Energy Meters Medical Devices Portable Instruments Factory Automation IoT Devices Surveillance Cameras Servers 19-100992 Rev 0 7/21 2 MAX31329 Low-Current, Real-Time Clock with I C, Power Management, and Integrated Crystal Simplified Block Diagram X1 X2 DIV BY INTB/ POWER OSCILLATOR V CC 1/4/8/32K CLKOUT CONTROL VCC AND TRICKLE INTERNAL CHARGER V GND BAT POR INTA/ EXT CLOCK, CLKIN SYNC CALENDAR, AND ALARM REGISTERS N DIN CONTROL LOGIC AND REGISTERS SCL SERIAL BUS INTERFACE SDA AND ADDRESS REGISTER N MAX31329 www.maximintegrated.com Maxim Integrated 2