Details

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BUY M48T35Y-70MH1 https://www.utsource.net/itm/p/1330790.html
256 Kbit 32Kb x8 TIMEKEEPER SRAM

Parameter	Description	Value
Device Type	Real-Time Clock (RTC) with RAM	M48T35Y-70MH1
Package Type	SOIC-8	8-Pin SOIC
Operating Voltage	Vcc Range	2.0V to 5.5V
Current Consumption	Active Mode Current	200nA (typical)
RAM Size	Integrated RAM	512 bits (64 x 8)
Clock Accuracy	卤200ppm at 25掳C	卤200ppm
Temperature Range	Operating Temperature	-40掳C to +85掳C
Supply Current	Backup Supply Current	1渭A (max)
Oscillator Frequency	Internal Oscillator Frequency	32.768kHz
Data Retention	Data Retention Time	10 years
Communication Interface	I2C/SMBus Interface	Up to 400kHz
Pin Configuration	SDA, SCL, Vcc, GND, Vbat, NC, NC, NC	SOIC-8

Instructions for Use:

1. Power Supply:

   • Connect Vcc to the main power supply (2.0V to 5.5V).
   • Connect Vbat to a backup power source (typically a coin cell battery) to maintain the clock and RAM during power loss.

2. Grounding:

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

3. Communication:

   • Connect SDA (Serial Data Line) and SCL (Serial Clock Line) to the I2C bus of your microcontroller.
   • Pull-up resistors (typically 4.7k惟) should be used on both SDA and SCL lines.

4. Initialization:

   • Initialize the I2C communication and set the device address (0x68 for M48T35Y).
   • Set the time and date registers according to your requirements.

5. Reading Time and Date:

   • Use I2C commands to read the current time and date from the respective registers.
   • The time and date are stored in BCD (Binary-Coded Decimal) format.

6. Writing to RAM:

   • Use I2C commands to write data to the RAM registers (0x08 to 0x3F).
   • Data is written in bytes.

7. Reading from RAM:

   • Use I2C commands to read data from the RAM registers (0x08 to 0x3F).
   • Data is read in bytes.

8. Backup Battery:

   • Ensure the backup battery is installed and has sufficient charge to maintain the clock and RAM during power loss.
   • Replace the battery if the voltage drops below the recommended level.

9. Handling Precautions:

   • Handle the device with care to avoid static damage.
   • Follow proper soldering techniques to ensure reliable connections.

10. Storage:

    • Store the device in a dry, cool place to prevent moisture damage.

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

(For reference only)