IIC串行接口实时时钟IC.PDFVIP

SD2405ALPI IIC 串行接口的实时时钟IC High Precision RTC module －SD2405AL (V1.00) Integrated RTC/Crystal 1.General Description 2 The SD2405AL is an extremely accurate I c real-time clock(RTC) with crystal compensation, inner chargeable battery. The SD2405AL is available in industrial temperature ranges. The SD2405AL is dual power supply system. When the primary power supply goes down to an assigned value or resumes from low power, the system can switch between the primary power supply and battery automatically. The SD2405AL can generates various periodic interrupt clock pulses lasting for long period (one year), and three alarm interrupts can be made by year,month,date,days of the week, hours, and minutes, seconds. It also provides a selectable 32.768KHz~1Hz clock output for an external MCU. The product incorporates a time trimming circuit that adjusts the clock with higher precision by adj usting any errors in crystal oscillator frequencies based on signals from the CPU. A 12-bytes general SRAM is implemented in the SD2405AL. 2.Features： l Operation voltage range:3.3V~5.5V. l Low-power:typical 1uA (inner battery, Ta=25°C) l Accuracy ±5ppm from -40°C to +85°C. l 2 Fast (400kHz) I C Interface(4.5~5.5V). l Real-Time Clock Counts Seconds, Minutes,Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100. l Time-of-Year,Month,Day,Week,Hour,Minute,Second Alarms. l Programmable Square-Wave Output:32768hz,4096hz...1hz..1/ 16hz. l Countdown time