Instructions for 25LC640T-I/SN

1. Power Supply:

   • Ensure the operating voltage (V_CC) is within the range of 2.5V to 5.5V.
   • Connect the ground (GND) pin to a stable ground reference.

2. Communication:

   • The device uses the SPI (Serial Peripheral Interface) protocol.
   • Connect the following pins:
     • MISO (Master In, Slave Out): Data output from the device.
     • MOSI (Master Out, Slave In): Data input to the device.
     • SCK (Serial Clock): Clock signal from the master.
     • CS (Chip Select): Active low signal to select the device.

3. Initialization:

   • Before any communication, ensure the CS pin is high (inactive).
   • To start communication, pull the CS pin low (active).

4. Reading Data:

   • Send the Read command (0x03) followed by the address of the data to be read.
   • The device will respond with the data at the specified address.

5. Writing Data:

   • Send the Write Enable command (0x06) to allow writing.
   • Send the Write command (0x02) followed by the starting address and the data to be written.
   • The write operation will take up to 5ms to complete.

6. Page Write:

   • Up to 32 bytes can be written in a single page write operation.
   • Ensure the data does not cross a 32-byte boundary.

7. Status Register:

   • Use the Read Status Register command (0x05) to check the status of the device.
   • Use the Write Status Register command (0x01) to modify the status register settings.

8. Endurance and Data Retention:

   • The device is rated for 1 million write cycles.
   • Data retention is guaranteed for 100 years under normal operating conditions.

9. Temperature Considerations:

   • Ensure the operating temperature is within -40°C to 85°C.
   • Store the device within -65°C to 150°C to maintain reliability.

10. Power Down:

    • When the device is not in use, set the CS pin high to put the device into standby mode, reducing power consumption.

For more detailed information, refer to the datasheet provided by the manufacturer.