The MAX31341B low-current, real-time clock (RTC) is a time-keeping device that provides nanoamperes timekeeping current, extending battery life. The MAX31341B supports 6pF high-ESR crystals, which broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. The device features one digital Schmitt trigger input and one programmable threshold analog input. The device generates an interrupt output on a falling or rising edge of the digital input (D1), or when the analog input (AIN) voltage crosses a programmed threshold in either direction. 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, a serial bus timeout mechanism, and a 64-byte RAM for user data storage. 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 24-hour format. The MAX31341B also includes an 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 (ECLK) is set to 1, the MAX31341B RTC is frequency-locked to the external clock and the clock accuracy is determined by the external source.
The device is available in lead (Pb)-free/RoHS-compliant, 12-pin, 2mm x 1.5mm WLP with 0.5mm pitch. The device supports the -40°C to +85°C extended temperature range.
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