CAT24C128WI-GT3 Detailed explanation of pin function specifications and circuit principle instructions
The " CAT24C128WI-GT3 " is a product from ON Semiconductor. It is a 128 Kbit (16 K x 8) EEPROM with I2C interface . Below is a detailed explanation of its pin functions, packaging, and a list of common FAQs related to the product.
1. Packaging
The CAT24C128WI-GT3 comes in a TSSOP-8 (Thin Shrink Small Outline Package) with 8 pins.
2. Pinout and Functionality
Pin Number Pin Name Pin Function Description 1 A0 Address pin for selecting device address in I2C communication. Typically used for multi-device operation. 2 A1 Address pin for selecting device address in I2C communication. 3 A2 Address pin for selecting device address in I2C communication. 4 GND Ground pin, used for connecting to the system ground. 5 SDA Serial Data Input/Output (SDA), the data line for I2C communication. This is the bi-directional data line. 6 SCL Serial Clock Line (SCL), provides the clock signal for I2C communication. 7 WP Write Protect pin. When low, write operations are allowed; when high, write operations are disabled. 8 VCC Power supply pin, typically 2.7V to 5.5V for operation.3. Detailed Pin Functionality
A0, A1, A2: These pins are used for device addressing in a multi-device setup. By setting them high or low, you can select a specific address for each device on the I2C bus. If all are connected to ground, the address is 0xA0. GND: This is the reference ground pin. It must be connected to the system's ground to ensure correct functionality of the device. SDA (Serial Data): This pin handles the data transfer between the EEPROM and the I2C master (such as a microcontroller). It is a bi-directional line used for sending and receiving data. SCL (Serial Clock): The clock signal that synchronizes data transfer on the I2C bus. The I2C master generates the clock signal, and the EEPROM synchronizes to it. WP (Write Protect): The WP pin is used to protect the memory from being written to. If the WP pin is high, writing to the EEPROM is disabled, providing data protection. If it is low, writes are allowed. VCC: This pin is used for providing power to the EEPROM. The device operates on a voltage range of 2.7V to 5.5V, ensuring compatibility with a wide range of systems.4. FAQ - Frequently Asked Questions
1. What is the maximum operating voltage for the CAT24C128WI-GT3? The maximum operating voltage for the CAT24C128WI-GT3 is 5.5V. 2. Can I use the CAT24C128WI-GT3 with a 3.3V microcontroller? Yes, the CAT24C128WI-GT3 operates with a supply voltage of 2.7V to 5.5V, so it is compatible with 3.3V microcontrollers. 3. What is the communication protocol used by the CAT24C128WI-GT3? The CAT24C128WI-GT3 uses the I2C communication protocol. 4. How many devices can I connect to the same I2C bus? You can connect up to 8 devices with different addresses using the address pins A0, A1, and A2 to configure the device addresses. 5. What is the capacity of the CAT24C128WI-GT3 EEPROM? The CAT24C128WI-GT3 has a capacity of 128 Kbits (16 K x 8), which equals 16,384 bits of storage. 6. What is the Write Protect feature on the CAT24C128WI-GT3? The Write Protect (WP) pin allows you to disable write operations to protect data. If the WP pin is high, write operations are disabled; if low, writes are allowed. 7. What is the typical access time for the CAT24C128WI-GT3? The typical access time is 400ns for read operations. 8. Can I use the CAT24C128WI-GT3 for memory expansion? Yes, the CAT24C128WI-GT3 is suitable for memory expansion in systems with I2C communication. 9. Is the CAT24C128WI-GT3 suitable for automotive applications? The CAT24C128WI-GT3 is not specifically designed for automotive applications but can be used in general-purpose electronics and low-power systems. 10. Can I use the CAT24C128WI-GT3 in a 5V system? Yes, the CAT24C128WI-GT3 is compatible with systems that use 5V power. 11. How do I erase data in the CAT24C128WI-GT3? The data in the EEPROM can be erased or overwritten by writing new data to the specific memory locations. EEPROMs do not have a dedicated "erase" function, as each byte can be overwritten. 12. What is the typical write cycle time for the CAT24C128WI-GT3? The typical write cycle time is 5ms. 13. Can I use the CAT24C128WI-GT3 for non-volatile memory in microcontrollers? Yes, the CAT24C128WI-GT3 is often used as non-volatile memory for storing configuration data, calibration values, or other critical data. 14. What is the maximum I2C clock speed for the CAT24C128WI-GT3? The maximum I2C clock speed is 400 kHz in Fast mode. 15. Is the CAT24C128WI-GT3 available in other packages? The CAT24C128WI-GT3 is available in TSSOP-8, but it may also come in other packaging options based on customer needs and requirements. 16. What happens if I connect the SDA and SCL pins incorrectly? If the SDA and SCL pins are reversed, the device will not communicate correctly, and you will not be able to read or write data. 17. How do I initialize the CAT24C128WI-GT3 in an I2C communication system? Initialization involves configuring the I2C master (e.g., microcontroller) to generate clock pulses on the SCL line and exchange data on the SDA line, starting with the appropriate device address. 18. What should I do if the CAT24C128WI-GT3 is not responding? Check the I2C wiring, ensure the WP pin is not high (which would disable writing), and verify that the correct device address is being used. 19. Can I use the CAT24C128WI-GT3 with other I2C devices on the same bus? Yes, you can connect other I2C devices as long as they have unique addresses. 20. Is the CAT24C128WI-GT3 susceptible to power-down data loss? No, as an EEPROM, the CAT24C128WI-GT3 is non-volatile and retains data even when power is lost.I hope this information provides a comprehensive guide to the CAT24C128WI-GT3! Let me know if you need more details.
