Details

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BUY DS1307Z+ https://www.utsource.net/itm/p/4390468.html
IC RTC CLK/CALENDAR I2C 8-SOIC

Parameter	Description	Min	Typ	Max	Unit
Operating Voltage (Vcc)	Supply voltage range	4.5	-	5.5	V
Operating Temperature	Operating temperature range	-40	-	+85	°C
Standby Current	Current consumption in standby mode	-	500	-	nA
Active Current	Current consumption in active mode	-	250	-	μA
Frequency Accuracy	Accuracy of the 32.768 kHz oscillator	-	±2	-	ppm/°C
Timekeeping Accuracy	Accuracy over temperature range	-	±2	-	min/month
I2C Bus Speed	Maximum I2C bus speed	-	400	-	kbps
Output Drive Capability	Maximum output drive capability	-	15	-	mA
Oscillator Start-up Time	Time to start the oscillator	-	100	-	ms
Write Cycle Time	Time to complete a write cycle	-	5	-	ms

Instructions for Using DS1307Z+

1. Power Supply:

   • Connect the Vcc pin to a supply voltage between 4.5V and 5.5V.
   • Connect the GND pin to the ground.

2. Oscillator Connection:

   • Connect a 32.768 kHz crystal between the X1 and X2 pins for accurate timekeeping.
   • Alternatively, you can connect an external 32.768 kHz clock source to the X1 pin.

3. I2C Interface:

   • Connect the SDA (Serial Data) and SCL (Serial Clock) pins to the I2C bus.
   • Use pull-up resistors on both SDA and SCL lines, typically 4.7kΩ to Vcc.

4. Initialization:

   • Send a start condition followed by the device address (0xD0 for write, 0xD1 for read).
   • Send the register address where you want to read from or write to.
   • For writing, send the data byte(s) to the specified register.
   • For reading, send a repeated start condition, then the device address with read bit set, and read the data byte(s).

5. Time Setting:

   • Set the time by writing to the appropriate registers (seconds, minutes, hours, day, date, month, year).
   • Use BCD (Binary-Coded Decimal) format for the time values.

6. Reading Time:

   • Read the time by accessing the same registers used for setting the time.
   • Convert the BCD values to decimal for easier interpretation.

7. Square Wave Output:

   • Enable the square wave output by setting the appropriate bits in the control register.
   • The frequency can be selected as 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.

8. Battery Backup:

   • Optionally, connect a backup battery to the Vbat pin to maintain timekeeping when the main power is off.

9. Reset:

   • The DS1307Z+ does not have a reset pin. To reset, power cycle the device or write a specific value to the control register to stop and restart the oscillator.

10. Troubleshooting:

    • Ensure the crystal is properly connected and functioning.
    • Check the I2C bus for proper communication and correct pull-up resistor values.
    • Verify that the power supply voltage is within the specified range.

(For reference only)