Built-in IIC serial interface, multiple interrupt output, clock precision adjustment register
SD2068 is a real time clock chip
with standard IIC interface. By the interface, CPU can read and write the data in the chip with 32 bytes registered by 5-bit address addressing (including time register, alarm register, control register, general SRAM registers). SD2068 built-in single path timing/alarm interrupt output. The maximum alarm interruption can be set to 100 years. Built-in clock precision digital adjustment function, so you can correct clock deviation in a very wide range (-189ppm ~ +189ppm, resolution: 3.05ppm). And you also can set adjustment value as the temperature changes by the external temperature sensors, so that you can achieve high precision timing function in a wide temperature range. The chip can meet the various needs of real-time clock chip. It is an industrial grade products. And it is ideal choice for real-time IC.
Main features and characteristics:
Low power consumption: 1.0μA typical values (VBAT= 3.0V, Ta = 25 ℃).
Working voltage: 1.8 ~ 5.5V, working temperature: -40 ℃ ~ +85 ℃.
Standard IIC bus interface method, maximum speed 400KHZ (4.5V ~ 5.5V).
BCD code input/output about year, month, day, week, hour, minute, and second, and each time registered can be accessed through an independent address.
Leap year automatic adjustment function (from 2000 to 2099).
Optional 12/24 hours system.
Built-in the alarm data register with year, month, day, week, hour, minutes and seconds (7 byte) and the alarm enable register (1 byte).
Built-in the general SRAM register (12-byte), which can be used to store the user's general data.
The three interrupts can be output from INT foot and have two interrupt flags.
Built-in three clock data write protection flags to avoid data mis-write operation. So the clock data can be protected well.