The " 24LC128T-I/SN " is a specific part number for a Microchip product. It is a 128 Kbit (16K x 8) EEPROM ( Electrical ly Erasable Programmable Read-Only Memory ). Here's a detailed explanation of its pin functions, specifications, and usage instructions.
Pin Function Table (Pinout):
This component has 8 pins, so here’s a detailed breakdown:
Pin Number Pin Name Function Description 1 VSS Ground (GND). This pin is connected to the system ground in the circuit. 2 WP Write Protect (active low). When connected to GND, the device's write protection is disabled. When connected to VCC, it protects the memory. 3 SDA Serial Data (I2C data line). This is the bi-directional data line for I2C Communication . It carries address and data bits. 4 SCL Serial Clock (I2C clock line). This pin receives the clock signal for I2C communication, providing synchronization. 5 A0 Address Pin 0. This pin allows for configuring different addresses for multiple EEPROMs on the same bus. It is tied to either VCC or VSS to set the LSB of the address. 6 A1 Address Pin 1. Similar to A0, this pin allows for further address selection when connecting multiple EEPROMs. 7 A2 Address Pin 2. Like A0 and A1, this pin further extends the address range for addressing different memory locations. 8 VCC Power Supply Pin. This pin is connected to the positive voltage supply, usually 2.5V to 5.5V, depending on the operating conditions.Pin Configuration in I2C Communication:
The 24LC128T-I/SN communicates via I2C protocol. The main control pins are SDA (Serial Data) and SCL (Serial Clock). Address pins (A0, A1, A2) are used for device addressing when multiple devices are connected to the same I2C bus. The WP pin can be used to protect the memory from accidental writes.
Pin Usage Instructions:
VSS (Ground): This is where you connect the ground of your power supply. WP (Write Protect): If you connect WP to VCC, the EEPROM will be in write-protected mode. If connected to VSS, write operations are enabled. SDA and SCL: These two pins are used for data transmission and clock synchronization. SDA carries data, while SCL provides the clock signal to synchronize communication. A0, A1, A2: These pins determine the I2C device address. You can use these to select multiple EEPROM devices on the same I2C bus. VCC: Connect this to your power supply (typically 3.3V or 5V depending on your system).Commonly Asked Questions (FAQ):
1. Q: What is the write protection feature on the 24LC128T-I/SN? A: The write protection is controlled via the WP pin. When WP is tied to VCC, the device is write-protected. If tied to VSS, write operations are allowed.
2. Q: What is the maximum clock frequency for I2C communication? A: The maximum clock frequency for I2C communication is typically 400 kHz (Fast Mode).
3. Q: How do I select the I2C address for the 24LC128T-I/SN? A: The I2C address is set by the combination of the A0, A1, and A2 address pins. By connecting these pins to either VCC or VSS, you can select a unique address.
4. Q: Can I connect multiple 24LC128T-I/SN devices on the same I2C bus? A: Yes, by using different combinations of address pins (A0, A1, A2), you can connect multiple devices on the same I2C bus.
5. Q: What voltage range can be applied to the VCC pin? A: The VCC pin can handle a voltage range from 2.5V to 5.5V, depending on the operating conditions.
6. Q: What is the data retention time for the 24LC128T-I/SN? A: The 24LC128T-I/SN offers data retention of up to 40 years.
7. Q: Is there any special consideration for the SDA and SCL lines? A: Yes, these two pins should be properly terminated with pull-up resistors (typically 4.7kΩ) to ensure proper communication.
8. Q: Can the 24LC128T-I/SN be used in a 3.3V system? A: Yes, the 24LC128T-I/SN can operate with a 3.3V power supply.
9. Q: What happens if I exceed the maximum voltage rating on the VCC pin? A: Exceeding the maximum voltage rating could damage the EEPROM, causing it to malfunction or fail.
10. Q: How do I perform a write operation on the 24LC128T-I/SN? A: To write data, you need to send the device address and the data to be written over the I2C bus, followed by the memory address where the data should be stored.
11. Q: How long does it take to write data to the EEPROM? A: The write cycle time for the 24LC128T-I/SN is typically 5 ms per byte.
12. Q: What is the EEPROM's maximum data storage capacity? A: The 24LC128T-I/SN has a total storage capacity of 128 Kbits (16K x 8 bits).
13. Q: What is the I2C bus voltage level required for the 24LC128T-I/SN? A: The I2C bus voltage level should match the VCC level, typically 3.3V or 5V.
14. Q: How do I disable write protection? A: Write protection is disabled when WP is connected to VSS, allowing data to be written to the EEPROM.
15. Q: Can I use this EEPROM in automotive applications? A: Yes, the 24LC128T-I/SN is suitable for automotive applications, but you must verify that the operating temperature range matches your specific needs.
16. Q: What are the power consumption specifications for the 24LC128T-I/SN? A: The typical operating current is 1 mA during reads, and the standby current is less than 1 μA.
17. Q: What happens if the SDA and SCL lines are shorted together? A: Shorting SDA and SCL will prevent proper communication on the I2C bus and may cause the device to malfunction.
18. Q: How do I check if the EEPROM has been written successfully? A: After writing, you can read back the data and verify it matches the written value.
19. Q: Can I use the 24LC128T-I/SN with other communication protocols besides I2C? A: No, the 24LC128T-I/SN is designed specifically for I2C communication and does not support other protocols.
20. Q: Is the 24LC128T-I/SN compatible with 5V logic? A: Yes, the 24LC128T-I/SN is fully compatible with 5V logic levels for both communication and power supply.
This summary covers the detailed pinout and important FAQ related to the 24LC128T-I/SN EEPROM chip. The pinout includes 8 pins, each with a specific function, and I’ve provided answers to some of the most frequently asked questions about this device.
