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.ApplicationsEnergy MetersFactory AutomationIndustrial EquipmentIoT DevicesMedical DevicesPortable InstrumentsServersSurveillance CamerasTest and Measurement Equipment