Microchip Technology 24LC02BT-E/SN

Microchip 24LC02BT-E/SN Product Introduction

The Microchip 24LC02BT-E/SN is a 2-Kbit (256x8) serial Electrically Erasable Programmable Read-Only Memory (EEPROM) with an I²C-compatible interface. Designed for a wide range of embedded applications, this EEPROM offers non-volatile data storage for parameter retention, calibration constants, and system data logging. The device operates over a voltage range of 2.5V to 5.5V and supports data rates up to 400 kHz, making it ideal for resource-constrained designs where size, power, and reliability are paramount. Manufactured by Microchip Technology, the 24LC02BT-E/SN addresses the requirements of both industrial and automotive sectors, with AEC-Q100 qualification and extended temperature range options.

Main Features and Benefits of 24LC02BT-E/SN

The 24LC02BT-E/SN stands out through a rich feature set tailored for robustness, integration simplicity, and long-term data integrity:

I²C Serial Interface: Supports standard and fast-mode operation (compatible up to 400 kHz), simplifying system integration using a two-wire bus topology.

Single Supply Operation: Requires only 2.5V minimum supply voltage, suitable for modern energy-efficient platforms.

Low Power Consumption: Maximum read current of 1mA; maximum standby current of 1μA, enabling battery-powered/portable system use.

Write Protection: Hardware write-protect pin supports comprehensive data security scenarios by inhibiting inadvertent writes.

High Endurance and Retention: More than 1,000,000 erase/write cycles and data retention exceeding 200 years ensure suitability for mission-critical and long-lifetime applications.

Page Write Buffer: An 8-byte page write buffer allows for efficient burst data writing, optimizing throughput and system bandwidth.

Industrial and Automotive Qualification: Full support for -40°C to +85°C (industrial) and -40°C to +125°C (extended automotive) environments.

RoHS Compliance: Ensures environmental compatibility for global markets.

Integrated Schmitt Trigger Inputs and Output Slope Control: Enhances noise immunity and reduces system-level EMI/Ground bounce.

24LC02BT-E/SN Packaging Variants and Labeling

The 24LC02BT-E/SN series caters to diverse assembly and form factor requirements through an extensive set of packages:

8-Lead SOIC (3.90 mm), the standard for most PCB-level applications and the focus for the “-E/SN” variant.

Other available footprints in the 24LC02 family include 8-Lead DFN, MSOP, PDIP, TDFN, TSSOP, UDFN, and small 5-Lead SC-70/SOT-23 variants.

All packages conform to JEDEC standards, aiding in streamlined PCB design and manufacturing.

Markings follow the Microchip part numbering system with temperature range codes, year/week information, and traceability.

Automotive and industrial grades are clearly differentiated to facilitate proper part selection in qualified environments.

Comprehensive Electrical Specifications of 24LC02BT-E/SN

For product selection engineers, the electrical performance envelope is vital:

Absolute Maximum Ratings:

- Vcc supply voltage tolerance up to 6.5V.

- I/O voltage: -0.3V to (Vcc + 1.0V).

- Storage temperature: -65°C to +150°C.

- ESD protection rated above 4kV on all pins.

Operating Parameters:

- Vcc range for 24LC02B devices: 2.5V to 5.5V.

- Compatible with I²C bus speeds at 100 kHz and 400 kHz (1 MHz for certain family variants).

Power Consumption:

- Active read: max 1mA; Standby: max 1μA (industrial temp).

- Page write time: maximum 5ms per 8-byte page.

Endurance and Data Retention:

- Over 1 million program/erase cycles and 200-year data integrity assurance.

Robustness against external noise and ESD events thanks to integrated input protection and filtering.

Pin Description and Configuration for 24LC02BT-E/SN

A detailed appreciation of pin assignments simplifies system integration:

A0, A1, A2: (Not internally connected in 24LC02BT-E/SN) – can be grounded, pulled high, or left floating as recommended for mechanical stability.

Serial Clock (SCL): Receives the clock from the host; synchronizes communication on the I²C bus.

Serial Data (SDA): Bidirectional open-drain data line, requiring an external pull-up resistor as specified for desired I²C speed.

Write Protect (WP): Enables hardware write protection by tying to Vcc (all memory array write-inhibited). Tie to Vss for normal operation.

Power and Ground: Standard Vcc and Vss pins are included.

Functional Overview and Communication Methods of 24LC02BT-E/SN

Engineered for I²C-compliant communication, the 24LC02BT-E/SN features a robust, yet straightforward protocol:

Host-centric Bus Control: The host (microcontroller or processor) dictates SCL timing, initiates all bus transactions, and defines data direction.

Command Flow: Every transaction begins with a Start condition and ends with a Stop condition, ensuring bus discipline and data integrity.

Device Addressing: The device responds to a fixed address (control byte '1010xxxx') with the last bits and R/W bit determining read/write operations.

Data Transmission:

- Write transactions include a control byte, word address, and up to eight data bytes (page buffered).

- Read operations are flexible, supporting current address, random, and sequential reads.

Acknowledge Mechanism: Each data/command byte is followed by an acknowledge from the receiving party.

Protocol Safeguards: Integrated noise filtering (Schmitt triggers), stable data requirements during SCL high, and a requirement for Start/Stop framing minimize communication errors in real-world conditions.

Data Write/Read Procedures for 24LC02BT-E/SN

An understanding of 24LC02BT-E/SN memory operations is crucial for robust system firmware design:

Byte Write: Single-byte transferred after device and word address selection; committed to memory after write cycle.

Page Write: Between 2 and 8 bytes may be written in rapid succession; wrapped within single physical page (software must ensure page boundaries are not violated to prevent data overwrite).

Acknowledge Polling: During internal write cycles, the device temporarily ignores bus communication. After initiating a write, hosts can repeatedly poll the device by sending a start condition and checking for an acknowledge, allowing for efficient bus usage.

Read Modes:

- Current Address Read: Retrieves the value at the current internal address pointer.

- Random Read: Allows setting an arbitrary word address, enabling flexible access patterns.

- Sequential Read: After initial random read, the device will auto-increment its internal pointer, providing successive data bytes on receiving host-acknowledge pulses—ideal for bulk data transfers.

Write Protection: By tying the WP pin high, all write commands are ignored by the EEPROM, adding an effective guard against unintentional data modification.

Reliability, Lifespan, and Environmental Specifications of 24LC02BT-E/SN

Engineers targeting harsh or high-reliability markets will note:

High intrinsic endurance (1M+ cycles per cell) makes the 24LC02BT-E/SN suitable for applications with frequent parameter updates or configuration changes.

Data retention of over 200 years ensures non-volatile storage, supporting “set-and-forget” embedded systems and calibration data.

Wide Operating Temperature:

- Industrial: -40°C to +85°C

- Extended: -40°C to +125°C (automotive applications)

RoHS and AEC-Q100 qualification secure compliance in applications from standard industrial controllers to demanding automotive ECUs and safety-critical systems.

ESD robustness over 4,000V adds further protection for deployment in noisy industrial environments, automotive systems, and field-installed modules.

Compatible or Alternative Models to 24LC02BT-E/SN

When seeking compatible alternatives, consider these solutions from Microchip:

24AA02: Nearly identical I²C EEPROM from the same family, with an extended supply range starting at 1.7V for power-sensitive or battery-powered designs.

24FC02: A faster variant of the same core architecture, supporting I²C speeds up to 1 MHz if higher data rates are required.

Other key parameters (write cycles, data retention, pinout, and package) remain consistent or nearly so across the series, enabling straightforward multi-sourcing or last-minute substitutions.

For legacy or cross-reference purposes, other industry-standard 2Kbit I²C EEPROMs with similar footprints may also serve as alternatives, though system-level validation is recommended especially for firmware compatibility.

Conclusion

The Microchip 24LC02BT-E/SN presents a compelling EEPROM solution for engineers requiring reliable non-volatile storage in embedded designs. Its combination of low power consumption, robust communication protocol, write protection, high endurance, and comprehensive packaging options makes it an attractive choice for industrial, consumer, and automotive applications. The compatibility with the broader 24AA02/24LC02B/24FC02 family and a wealth of proven integration features ensure design flexibility and long lifecycle support. For engineers and procurement teams seeking a dependable, industry-standard I²C EEPROM, the 24LC02BT-E/SN should be a leading candidate.