The DS1302 is a low-power real-time clock chip developed by Dallas, USA. It offers precise timekeeping with features such as year, month, day, week, hour, minute, and second tracking. Additionally, it includes automatic leap year compensation and supports both 12-hour and 24-hour formats for time display.
The DS1302 operates on a wide voltage range from 2.0V to 5.5V, making it suitable for various applications. It uses a three-wire interface for communication with the CPU, allowing for efficient data transfer in burst mode. The chip also includes a 31×8 RAM register for temporary data storage. It is an upgraded version of the DS1202, featuring dual power supply pins for main and backup power, along with a fine current charging capability for the backup battery.
The DS1302 is widely used in devices like telephones, fax machines, and portable instruments. Its key performance features include:
1. Real-time clock functionality that provides seconds, minutes, hours, date, month, and year.
2. Automatic adjustment for leap years and support for AM/PM configuration.
3. 31 bytes of RAM for storing user data.
4. Serial I/O communication, which helps save microcontroller I/O pins.
5. Wide operating voltage range (2.0V to 5.5V) and dual power supply support.
6. Low power consumption, typically less than 300nA at 2.0V.
7. Available in two package types: DIP-8 and SOP-8, with different widths to suit various designs.
The DS1302 has 8 pins, and its pinout can be found in detailed diagrams. These diagrams show the functions of each pin, including the control enable (CE), serial clock (SCLK), and data input/output (I/O).
In terms of operation, the DS1302 requires specific timing sequences for reading and writing data. For single-byte writes, the CE signal must be high while the SCLK is low. Data is then sent through the I/O line, and a write operation occurs on the falling edge of the SCLK.
For more detailed information, you can download the DS1302 real-time clock module documentation and schematic. These resources provide essential details for integration into your projects.
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