The Microchip AT25020B-SSHL-T: A Robust 2-Wire Serial EEPROM for Modern Designs

In the realm of embedded systems and IoT devices, reliable non-volatile memory is a fundamental component for storing critical configuration data, calibration constants, and operational parameters. The Microchip AT25020B-SSHL-T stands out as a premier solution in this space, offering a robust and efficient method for data storage in a compact package. This 2-Kbit (256 x 8) Serial EEPROM memory chip leverages the ubiquitous 2-wire serial interface (I²C protocol) to provide a simple yet powerful connection to a host microcontroller, making it an ideal choice for a vast array of applications.

A key advantage of the AT25020B-SSHL-T is its low-power operation, which is critical for battery-powered and portable devices. It features an active current consumption of just 1 mA and a standby current of only 5 µA, ensuring minimal drain on power resources. The device supports a wide voltage range from 1.8V to 5.5V, providing significant design flexibility across various logic levels and enabling its use in both modern low-voltage and legacy systems.

Data integrity and reliability are paramount, and this EEPROM addresses these concerns with several built-in features. It offers a high endurance of 1,000,000 read/write cycles and a data retention period of 100 years. The memory array is organized in 8-byte page mode, allowing for efficient writing of small data blocks. Furthermore, the chip incorporates advanced write protection mechanisms. A dedicated Hardware Write Protect (WP) pin, when asserted, prevents any changes to the status register or memory array, safeguarding data from accidental corruption. Software write protection is also available, allowing users to protect either a quarter, half, or the entire memory array.

Housed in an 8-lead SOIC package (SSHL), the device is suitable for automated assembly processes and is designed to operate reliably across the industrial temperature range of -40°C to +85°C. Its small footprint makes it perfect for space-constrained PCB designs. The simple two-wire interface reduces the number of GPIOs required on the host microcontroller, simplifying board layout and lowering overall system cost.

ICGOOODFIND: The Microchip AT25020B-SSHL-T is a highly reliable and efficient serial EEPROM solution. Its combination of a simple I²C interface, wide voltage range, ultra-low power consumption, and robust hardware and software data protection features makes it an excellent choice for designers seeking dependable non-volatile memory in consumer, industrial, and automotive applications.

Keywords: I²C Interface, Low-Power Operation, Hardware Write Protect, Serial EEPROM, Data Retention.