Details

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BUY DS1387+ https://www.utsource.net/itm/p/12594845.html

Parameter	Description	DS1387+ Specifications
Device Type	Real-Time Clock (RTC) with RAM	RTC with 56 bytes of battery-backed SRAM
Supply Voltage	Operating voltage range	2.0V to 5.5V
Current Consumption	Active mode current	400nA typical at 3.3V, 1.0Hz
Clock Accuracy	Temperature range for accuracy	卤2 minutes per year from -40掳C to +85掳C
Oscillator Frequency	Internal oscillator frequency	32.768kHz
Communication Interface	Interface type	I2C
RAM Size	Battery-backed SRAM size	56 bytes
Package Type	Package options	SOIC-8, TSSOP-8
Operating Temperature	Temperature range for operation	-40掳C to +85掳C

Instructions for Use:

1. Power Supply Connection:

   • Connect VCC to the power supply (2.0V to 5.5V).
   • Connect GND to the ground.

2. Battery Backup:

   • Ensure a backup battery is connected to maintain the clock and RAM data during power loss.

3. I2C Communication Setup:

   • Connect SDA (data line) and SCL (clock line) to the microcontroller or processor.
   • Use pull-up resistors on both SDA and SCL lines as required by the I2C standard.

4. Initialization:

   • Set the time and date registers using the I2C interface.
   • Configure control bits in the status register as needed (e.g., square wave output).

5. Reading Time and Date:

   • Access the respective registers via I2C to read the current time and date settings.

6. Writing to SRAM:

   • Write data to the SRAM addresses to store information that needs to be preserved during power-off conditions.

7. Square Wave Output:

   • Enable the square wave output if required by configuring the appropriate control bit.

8. Handling Power Failures:

   • The device automatically switches to battery power when VCC drops below the threshold.

9. Software Considerations:

   • Implement error checking and handling routines for robust communication over the I2C bus.

This table and set of instructions provide essential details for integrating the DS1387+ into a design.

(For reference only)