Details

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BUY M48T86PC1 https://www.utsource.net/itm/p/12600719.html

Parameter	Description	Value
Part Number	Full Part Number	M48T86PC1
Function	Real-Time Clock (RTC) with EEPROM
Package Type	SOIC-8
Operating Voltage	Supply Voltage Range	2.0V to 5.5V
Current Consumption	Active Mode Current	1.0 μA (typical)
Temperature Range	Operating Temperature Range	-40°C to +85°C
Clock Accuracy	±2 ppm at 25°C
Frequency	Oscillator Frequency	32.768 kHz
Memory	EEPROM Size	256 x 8 bits
Data Retention	Data Retention Time	10 years
Communication Interface	I2C Interface	Up to 400 kbps
Pin Configuration	VCC: Power Supply, GND: Ground, SDA: Data Line, SCL: Clock Line, SQW: Square Wave Output, RST: Reset, VBAT: Backup Battery Input
Square Wave Output	Frequency Options	1 Hz, 4.096 kHz, 8.192 kHz, 32.768 kHz
Reset Function	Active Low Reset Pin	Yes
Backup Battery	Backup Battery Input	Yes

Instructions for Use:

1. Power Supply:

   • Connect VCC to the main power supply (2.0V to 5.5V).
   • Connect VBAT to a backup battery (1.3V to 5.5V) to maintain clock operation during main power failure.

2. Grounding:

   • Ensure a solid ground connection by connecting GND to the system ground.

3. I2C Communication:

   • Connect SDA (Data Line) and SCL (Clock Line) to the I2C bus.
   • Ensure pull-up resistors are connected to SDA and SCL lines to VCC.

4. Square Wave Output:

   • Configure the square wave output frequency using the appropriate register settings.
   • Connect SQW to the desired output pin.

5. Reset Function:

   • The RST pin is active low. Connect it to a reset circuit or leave it unconnected if not used.

6. EEPROM Access:

   • Use I2C commands to read from and write to the EEPROM memory.
   • Ensure proper write cycles and timing to avoid data corruption.

7. Clock Initialization:

   • Set the initial time and date values in the RTC registers using I2C commands.

8. Power-On Sequence:

   • Ensure that VCC is stable before enabling the I2C communication.
   • If using a backup battery, ensure VBAT is connected before removing VCC.

9. Handling Precautions:

   • Handle the device with care to avoid static discharge.
   • Store the device in a dry environment to prevent moisture damage.

10. Testing:

    • Verify the functionality of the RTC and EEPROM by reading back the set values and checking the square wave output.

For detailed register maps and specific command sequences, refer to the datasheet provided by the manufacturer.

(For reference only)