24LC64-I-SN Detailed explanation of pin function specifications and circuit principle instructions

The " 24LC64-I/SN " model is a Memory IC manufactured by Microchip Technology. It is a 64 Kbit (8 K x 8) EEPROM ( Electrical ly Erasable Programmable Read-Only Memory), and it's designed for low- Power , non-volatile data storage. The "I" and "SN" suffixes in the part number denote the packaging and other specific variants such as industrial grade temperature ranges or surface-mount packaging options.

Package Type

The "24LC64-I/SN" typically comes in the SOIC-8 (Small Outline Integrated Circuit) package, which is a 8-pin surface-mount package.

Pin Function Specification (For 8-Pin SOIC Package)

Here’s the detailed function description for the 8 pins in the SOIC-8 package:

Pin Number Pin Name Function Pin 1 A0 (Address 0) This pin is used to select the lowest bit of the memory address in conjunction with other address pins (A1-A2). It is used for addressing up to 64Kbits of data. Pin 2 A1 (Address 1) This pin works with A0 and A2 for selecting the address bits for higher memory addressing. Pin 3 A2 (Address 2) This pin is the third bit for memory addressing. It is used in conjunction with A0 and A1 for the address of specific memory locations. Pin 4 Vss (Ground) The ground pin of the IC. This pin is connected to the system's ground. It completes the power circuit for proper functionality. Pin 5 SDA (Data) This is the serial data input/output pin. It is used for bidirectional Communication between the EEPROM and the microcontroller via the I2C protocol. Pin 6 SCL ( Clock ) This is the serial clock input pin. It synchronizes data transmission on the SDA line, controlling the timing of communication between devices. Pin 7 WP (Write Protect) This pin is used to enable or disable write protection. When it is pulled low, it disables write protection, allowing data writes to the memory. Otherwise, it protects the memory. Pin 8 Vcc (Supply Voltage) The power supply pin of the IC. It needs to be connected to a positive voltage supply (typically 2.5V to 5.5V) for proper operation of the EEPROM.

Circuit Principle and Working Instructions:

The 24LC64 is an I2C-compatible EEPROM, which means it uses the I2C protocol for communication. Here's a brief overview of the circuit principle:

Power Supply: The device requires a Vcc of between 2.5V to 5.5V. It also needs a ground (Vss) connection. I2C Bus Communication: The EEPROM communicates with external devices using the SDA (Data) and SCL (Clock) pins over the I2C protocol. The device operates as a slave device, and an external controller (e.g., microcontroller or processor) acts as the master. Addressing: The A0, A1, and A2 pins are used to select which EEPROM is being accessed in a multi-device I2C bus configuration. These pins allow you to connect multiple EEPROMs to the same bus, providing flexibility. Write Protection: The WP pin allows you to enable or disable the write protection functionality. When this pin is pulled low, you can write to the EEPROM. If it's high or floating, the memory is write-protected, preventing accidental data modification.

20 Common FAQ for the 24LC64-I/SN:

Q: What is the memory size of the 24LC64-I/SN? A: The 24LC64-I/SN has 64 Kbits of memory, organized as 8 K x 8 bits. Q: What is the operating voltage range for the 24LC64-I/SN? A: The 24LC64-I/SN operates within a voltage range of 2.5V to 5.5V. Q: How does the 24LC64 communicate with external devices? A: The 24LC64 communicates using the I2C protocol through the SDA (data) and SCL (clock) pins. Q: What is the maximum clock frequency for I2C communication? A: The maximum clock frequency for the I2C interface is 400kHz (Fast Mode). Q: What is the write protection feature on the 24LC64? A: The WP (Write Protect) pin, when pulled high or left floating, prevents writing to the memory, ensuring the data remains secure. Q: How many devices can be connected to the same I2C bus? A: The 24LC64 supports multiple devices on the same I2C bus, determined by the A0-A2 address pins, allowing up to 8 different devices with unique addresses. Q: Can the 24LC64 be used for both read and write operations? A: Yes, the 24LC64 supports both read and write operations over the I2C interface. Q: Is the 24LC64-I/SN suitable for low-power applications? A: Yes, it is designed for low-power consumption, making it ideal for battery-operated devices. Q: How long does the 24LC64 retain data after power loss? A: The 24LC64 retains data for over 100 years under normal operating conditions, even after power loss.

Q: Can I use the 24LC64 in a system with a microcontroller?

A: Yes, the 24LC64 is commonly used in microcontroller-based systems for non-volatile memory storage.

Q: What are the available packaging options for the 24LC64?

A: The 24LC64 is available in various package options such as SOIC-8, DIP-8, and others, depending on the application.

Q: What is the current consumption of the 24LC64 during write operations?

A: The 24LC64 typically consumes about 3mA during write operations.

Q: What happens if I try to write to the 24LC64 when the WP pin is high?

A: If the WP pin is high, the 24LC64 is in write-protection mode, and any write attempts will be ignored.

Q: Can I use the 24LC64 for storing large files?

A: The 24LC64 is not suitable for storing large files due to its limited 64 Kbit capacity. It is better for storing small data or configuration information.

Q: Can I perform a read operation immediately after a write operation?

A: Yes, you can perform a read operation immediately after a write operation, but the write must be completed before reading.

Q: What happens if there is a communication error while reading from or writing to the 24LC64?

A: The I2C protocol has error-checking mechanisms, but errors typically result in failed operations and may need retransmission or error-handling routines.

Q: What is the temperature range for the 24LC64-I/SN?

A: The 24LC64-I/SN is rated for industrial temperature ranges, typically from -40°C to +85°C.

Q: How can I erase data from the 24LC64?

A: Data can be erased by writing over the memory with new values. There is no dedicated erase command.

Q: Can I use the 24LC64 in a system with a 3.3V power supply?

A: Yes, the 24LC64 can be used in systems with a 3.3V power supply as long as the I2C voltage levels are properly matched.

Q: What are the typical applications of the 24LC64?

A: Typical applications include storing configuration settings, calibration data, and small amounts of persistent data in embedded systems, sensors, and other I2C-based devices.

Conclusion:

The 24LC64-I/SN is a versatile, low-power EEPROM with an 8-pin I2C interface. It offers a range of applications, from configuration storage to data retention in embedded systems. The pinout and usage instructions should help in integrating it into your design.