Details

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BUY DS1647-120+ https://www.utsource.net/itm/p/12426922.html

Parameter	Description	Value
Device Type	High-Precision Real-Time Clock/Calendar with RAM and Watchdog Timer
Operating Voltage (Vcc)	Supply voltage range	2.25V to 5.5V
Current Consumption	Active mode current at 3.3V, 25°C	300nA
Temperature Range	Operating temperature range	-40°C to +85°C
Clock Accuracy	±2 minutes per year at 25°C
RAM Size	Non-volatile RAM size	128 bytes
Watchdog Timer	Programmable watchdog timer	Yes
Package Type	Package options	SOIC-16, TSSOP-16
Communication Interface	I2C interface	Yes
Oscillator Frequency	Internal oscillator frequency	32.768 kHz

Instructions for Use

1. Power Supply:

   • Connect Vcc to the supply voltage (2.25V to 5.5V) and GND to ground.
   • Ensure a stable power supply to avoid any data corruption.

2. I2C Communication:

   • Connect SDA (data line) and SCL (clock line) to the appropriate I2C pins on your microcontroller.
   • Use pull-up resistors (typically 4.7kΩ) on both SDA and SCL lines to ensure proper communication.

3. Initialization:

   • After powering the device, initialize the I2C communication by sending the start condition followed by the device address (0x68).
   • Set the clock and calendar registers to the desired initial values.

4. Reading Time and Date:

   • To read the current time and date, send a start condition, device address, and register address (0x00 for seconds).
   • Read the subsequent registers for minutes, hours, day, date, month, and year.

5. Writing Time and Date:

   • To set the time and date, send a start condition, device address, and register address.
   • Write the desired values to the respective registers.

6. Using the Watchdog Timer:

   • Enable the watchdog timer by writing to the control register (0x0E).
   • Set the timeout period by writing to the watchdog timer register (0x0F).

7. RAM Access:

   • Access the non-volatile RAM by writing to or reading from the RAM address range (0x10 to 0x8F).

8. Power-Down Mode:

   • To enter power-down mode, write to the control register to disable the oscillator.
   • The device will consume minimal power in this mode.

9. Reset:

   • A reset can be performed by writing to the reset register (0x0D).

10. Error Handling:

    • Check for NACK conditions during I2C transactions to ensure successful communication.
    • Implement error handling routines to manage any communication failures.

For detailed information, refer to the DS1647-120+ datasheet provided by the manufacturer.

(For reference only)