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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
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