AS1801-BTDT;中文规格书,Datasheet资料.pdf

Datasheet AS1801 Ultra-Low Power, I²C Serial Real-Time Clock with Trickle Charger 1 General Description 2 Key Features The AS1801 serial real-time clock is a low-power clock/calendar with Real-Time Clock (RTC) counts seconds, minutes, hours, day, two programmable time-of-day alarms and a programmable square- date, month, and year with leap-year compensation valid up to wave output. Address and data are transferred serially through an 2100 I²C bus. 24-hour / 12-hour format with AM / PM indicator The clock/calendar provides seconds, minutes, hours, day, date, Trickle-Charger month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including I²C Serial Interface corrections for leap year. The clock operates in either the 24-hour or Two Time-of-Day alarms 12-hour format with AM / PM indicator. Oscillator Frequency Trimming (every 8 seconds, every 2 days) The AS1801 provides a clean clock/calendar start function by clearing the ‘wait_for_start’ flag in the control register. The flag is set Oscillator Stop Flag (deep power down detection) whenever a clock/calendar setting takes place and the counter Wait-for-Start Flag for clean clock start operation is stopped until restarted by clearing the flag. Back-up counter allows long access times (1s) of the serial In addition to the basic timekeeping functions the device offers dual interfaces power pins for primary and backup power supplies as well as a Programmable Square-Wave Output - Defaults to 1Hz on trickle charger at pin VBAT for the backup battery. Power-up The AS1801 pr