The Microchip 24LC08BT-I/ST: A Deep Dive into an 8K I2C Serial EEPROM

In the realm of embedded systems and electronics design, reliable non-volatile memory is a fundamental component for storing configuration data, calibration constants, or event logs. The Microchip 24LC08BT-I/ST stands as a robust and versatile solution in this space. This integrated circuit is an 8-Kbit (1-Kbyte) serial Electrically Erasable Programmable Read-Only Memory (EEPROM) that utilizes the ubiquitous I²C (Inter-Integrated Circuit) protocol for communication.

Housed in a space-saving TSSOP-8 package, this memory chip is designed for a wide operating voltage range of 1.7V to 5.5V, making it exceptionally suitable for both 5V and modern low-power 3.3V systems. Its low power consumption characteristics are a key advantage; the device features a standby current of just 1 µA (max.) and an active read current of 1 mA (max.), which is crucial for battery-powered applications.

The internal 8K of memory is organized as a block of 1024 x 8 (1024 bytes), which is further segmented into four 256-byte pages. This page structure is vital for efficient writing, as the device allows for page write operations of up to 16 bytes at a time, significantly speeding up the data storage process compared to writing single bytes. For data integrity, the 24LC08BT incorporates hardware write-protection. When the WP (Write Protect) pin is tied to VCC, the entire memory array is locked from write operations, preventing accidental data corruption.

Communication is handled via the two-wire I²C bus (SDA and SCL), supporting clock frequencies of up to 400 kHz. The device offers configurable addressing, with three address pins (A0, A1, A2) allowing users to connect up to four of these EEPROMs on the same bus, expanding the total available memory seamlessly. It is rated for over 1 million erase/write cycles and boasts data retention of over 200 years, ensuring long-term reliability.

Typical applications are vast and include:

Storing system parameters in smart meters and IoT sensors.

Data logging in industrial control systems.

Preserving user settings and calibration data in consumer electronics.

Use in automotive subsystems for non-critical data storage.

ICGOOODFIND: The Microchip 24LC08BT-I/ST is a highly reliable, low-power, and compact serial EEPROM. Its I²C interface, page write capability, and hardware write-protection make it an industry-standard choice for designers seeking a simple and effective method for adding non-volatile memory to their electronic designs.

Keywords:

1. I2C EEPROM

2. Non-volatile Memory

3. Page Write

4. Low Power Consumption

5. Hardware Write-Protection