The Microchip 24LC04BT-I/OT: A Deep Dive into a 4-Kbit Serial EEPROM

In the realm of embedded systems and electronics, reliable non-volatile memory is a fundamental component for storing critical data. The Microchip 24LC04BT-I/OT stands as a prominent solution, offering a robust and efficient method for data retention in a vast array of applications. This serial EEPROM (Electrically Erasable Programmable Read-Only Memory) chip combines a small physical footprint with a simple communication protocol, making it an ideal choice for designers.

Key Features and Architectural Overview

The 24LC04BT-I/OT is a 4-Kbit memory organized as a single block of 512 x 8 bits. This organization provides ample space for storing system parameters, calibration data, user settings, and other crucial information that must persist after power is removed. A defining feature of this device is its utilization of the I2C (Inter-Integrated Circuit) serial communication protocol. This two-wire interface, consisting of a serial data line (SDA) and a serial clock line (SCL), significantly reduces the number of I/O pins required on a microcontroller, simplifying board layout and design.

To allow for multiple memory devices on the same bus, the 24LC04BT-I/OT incorporates configurable device addressing. The chip features three address pins (A0, A1, A2), enabling up to eight 4K devices (for a total of 32 Kbits) to be connected on a single I2C bus, providing excellent scalability. The device supports both byte-level and page-level write operations. A 16-byte page write buffer allows for more efficient data transfer by writing multiple bytes in a single operation, reducing protocol overhead and increasing overall system speed.

Robustness and Packaging

Engineered for reliability, this EEPROM features high noise immunity and built-in protection against inadvertent writes. It includes hardware write-protection via a dedicated pin (WP). When the WP pin is tied to VCC, the entire memory array is protected from write operations, safeguarding data integrity. The chip is designed to endure an impressive 1,000,000 erase/write cycles per byte and offers data retention greater than 200 years. Housed in a space-saving SOT-23-5 package, the 24LC04BT-I/OT is perfectly suited for compact, portable consumer and industrial electronics where board real estate is at a premium. Its wide operating voltage range (1.7V to 5.5V) ensures compatibility with various logic levels.

Typical Applications

The versatility of the 24LC04BT-I/OT makes it a ubiquitous component across numerous industries. Common applications include:

Smart Meters: Storing metering data and calibration constants.

Automotive Systems: Retaining seat/mirror positions and module configuration data.

Medical Devices: Holding device usage logs and patient-specific settings.

Consumer Electronics: Storing user preferences and data in TVs, set-top boxes, and audio equipment.

Industrial Control Systems: Saving machine parameters and operational history.

ICGOODFIND: The Microchip 24LC04BT-I/OT is a highly integrated and dependable serial EEPROM solution. Its combination of a simple I2C interface, hardware write-protection, exceptional endurance, and a miniature package makes it an outstanding choice for designers seeking a proven non-volatile memory component for their next project.

Keywords: I2C Interface, Non-Volatile Memory, Serial EEPROM, SOT-23 Package, Hardware Write-Protection