A Real-time Clock IC with Two-wire Consecutive Interface

PublishTime： 2021-08-27 Article Source：Corebai

COREBAI's CBM1307 is essentially the binary–decimal digital watch with a calendar, it has the additional 56 bytes of the power self-sufficient static RAM and possesses low power consumption. The addresses and data are applied consecutively via the two-wire bi-directional bus. The microcircuit is intended for a count of the real-time in hours, minutes, and seconds, count of weekdays, date, month, and year. The last day of the month is automatically adjusted for the months or less, than 31 days, including correction for the leap year. The watches function in the 24-hour format or in the 12-hour format with the AM / PM indicator. CBM1307 has a built-in power supply control circuit, which determines the supply disruption and automatically switches over the device into the battery mode.

FEATURES

● Count of seconds, minutes, hours, week，days, date, months, and years with consideration of the leap years (before 2100);

● 56 bytes of the power self-sufficient RAM for the data storage;

● Two-wire consecutive interface;

● Programmable rectangular output signal;

● Automatic determination of the supply voltage drop and the switching diagram;

● Consumption of less than 500nА in the backup supply mode with the operating generator;

● Temperature range of the industrial application: -40℃ – +85℃

● Accuracy is better than ±1 minute per month

PIN DESCRIPTION

BLOCK DIAGRAM

TYPICAL APPLICATION CIRCUIT

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Integrated Circuits