The Microchip 24LC32AT-I/SN: A Robust 32K I2C Serial EEPROM Solution

In the realm of embedded systems and electronics design, reliable non-volatile memory is a fundamental component for data storage and configuration. The Microchip 24LC32AT-I/SN stands out as a premier solution, offering designers a robust and highly accessible memory chip for a vast array of applications.

This device is a 32Kbit (4096 x 8) serial Electrically Erasable PROM (EEPROM). It is organized as a block of 4K bytes, each byte being individually addressable, providing fine-grained control over data storage. A key feature of this chip 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), drastically reduces the number of pins required to connect the memory to a microcontroller, simplifying board layout and minimizing component count.

The 24LC32AT-I/SN is designed for broad operational compatibility, supporting a wide voltage range from 1.7V to 5.5V. This low-voltage operation makes it an ideal choice for both modern low-power microcontrollers and legacy 5V systems, ensuring design flexibility across generations of technology. Its low power consumption is further highlighted by its standby current of just 1 µA (max.), which is critical for battery-powered and energy-sensitive applications.

Hardware write-protection is implemented via a dedicated WP (Write Protect) pin. When this pin is tied to VCC, the entire memory array is locked against write operations, safeguarding critical data from accidental corruption. When connected to GND, write operations are permitted, allowing for full read and write functionality.

Housed in a compact 8-lead SOIC (SN) package, this EEPROM is well-suited for space-constrained PCB designs. Its industrial temperature rating (-40°C to +85°C) ensures reliable performance in demanding environments beyond standard commercial use. With a maximum clock frequency of 400 kHz, it offers sufficient speed for most configuration and data logging tasks.

Typical applications are extensive, including storage for:

System configuration and calibration data in industrial controls.

User preference and usage data in consumer appliances.

Data logging in portable medical devices.

Parameter storage in automotive subsystems.

ICGOODFIND: The Microchip 24LC32AT-I/SN is a quintessential serial EEPROM, delivering a perfect balance of density, low-power operation, and the simplicity of the I2C interface. Its hardware write-protection and wide voltage range make it an exceptionally versatile and reliable choice for safeguarding critical non-volatile data in countless electronic designs.

Keywords: I2C EEPROM, Non-volatile Memory, Low-power, Serial Communication, Hardware Write-Protection.