Analog Devices DS134x Low-Current I2C Real-Time Clock (RTC) for high-ESR crystals is a timekeeping device that provides an extremely low standby current, permitting longer life from a power supply. The RTC supports high-ESR crystals, broadening the pool of usable crystals for the devices. The DS134x is accessed through an I2C serial interface and features two time-of-day alarms, two interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism. The clock / calendar of this Analog Devices module 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 24hr or 12hr format with an AM/PM indicator.
