Microchip Technology 11AA02E64T-I/TT

Overview

11AA02E64T-I/TT from Microchip Technology Inc. is a 2 Kbit serial EEPROM with preprogrammed EUI-64™ node identity, UNI/O® single-I/O interface, 256 × 8-bit organization, and industrial temperature range (–40°C to +85°C). It delivers 1 µA standby current, 100 kbps bit rate, and built-in write protection for secure device identification in networked embedded systems.

For engineers reviewing the 11AA02E64T-I/TT datasheet, 11AA02E64T-I/TT pinout, 11AA02E64T-I/TT application, or 11AA02E64T-I/TT equivalent, this page provides verified pin mapping, real-world timing behavior under voltage drift and jitter, block write protection configuration, endurance/reliability metrics, and direct alternatives for EUI-64™-enabled serial EEPROM replacement.

Technical Context

The 11AA02E64T-I/TT implements Manchester-encoded UNI/O® protocol over a single SCIO line, eliminating need for separate clock and data lines. Its internal re-synchronization circuitry tolerates ±0.50% bus frequency drift per byte and ±5% total drift per command, with ±0.06 UI input edge jitter tolerance.

It features a 16-byte page-write buffer, STATUS register with WIP/WEL/BP bits, Schmitt-trigger SCIO input for noise immunity, and slope-controlled output to suppress ground bounce. Write operations are self-timed (≤5 ms per byte/page), with automatic erase and power-loss write protection.

Key Specifications

Pinout & Package

11AA02E64T-I/TT is housed in a Pb-free, RoHS-compliant 3-lead SOT-23 package (TT suffix), optimized for high-density PCB layouts. Pin 1 = SCIO, Pin 2 = VSS, Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM with unique node identity applications.

Compared with 11AA02E64T-I/TT, the 11AA02E48T-I/TT offers identical footprint and electrical behavior but with shorter node identity, while AT24C02C-SSHM-T trades integrated EUI-64™ and single-wire simplicity for higher speed and broader ecosystem support - necessitating redesign of both hardware interface and identity management firmware.

Availability

11AA02E64T-I/TT is available at Aetrix Electronics and suitable for IoT edge node identity, industrial sensor calibration storage, smart meter device authentication, and medical wearable serial ID requiring stable component supply across extended production lifecycles.

Supply support for 11AA02E64T-I/TT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 11AA02E64T-I/TT belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for space-constrained, low-power embedded systems requiring factory-programmed unique identifiers and minimal pin count interfaces.

FAQ

What is the exact memory organization of the 11AA02E64T-I/TT?

The 11AA02E64T-I/TT contains 256 words of 8-bit memory (2 Kbit total), organized as a linear 256-byte array with byte-addressable access. The device uses an internal address pointer that increments automatically during sequential reads or writes, and supports both random-address READ and current-address CRRD commands. Physical page boundaries occur every 16 bytes (0x00–0x0F, 0x10–0x1F, etc.), constraining page-write operations to stay within those bounds.

How does the UNI/O® interface of the 11AA02E64T-I/TT differ from standard I²C or SPI?

The 11AA02E64T-I/TT uses a patented single-wire UNI/O® bus with Manchester encoding, combining clock and data on the SCIO line - unlike I²C (2-wire) or SPI (4-wire). This eliminates dedicated clock lines and reduces routing complexity. Communication is master-initiated with start headers, ACK sequences (MAK/SAK), and standby pulses. It operates at up to 100 kbps (equivalent to 100 kHz clock), with built-in resynchronization to tolerate frequency drift and edge jitter - features absent in basic I²C/SPI peripherals.

Can the 11AA02E64T-I/TT be used in 1.8V systems, and what are its current consumption specs?

Yes, the 11AA02E64T-I/TT is fully specified for 1.8V–5.5V operation. At 1.8V, it draws ≤1 mA active current during READ/WRITE and ≤50 µA in Idle mode; standby current is ≤1 µA maximum at 85°C. These values are confirmed in DS20002122E Table 1-1 (D9–D12), enabling reliable use in battery-powered applications such as wearables and remote sensors where low-voltage operation is mandatory.

What protection mechanisms prevent accidental writes to the 11AA02E64T-I/TT?

The 11AA02E64T-I/TT employs three layered protections: (1) a volatile Write Enable Latch (WEL) that must be set via WREN before any write, (2) nonvolatile Block Protection bits (BP0/BP1) configurable via WRSR to lock 0%, 25%, 50%, or 100% of memory, and (3) power-on/off write protection circuitry that disables writes during brown-out conditions. All are documented in Sections 4.4 and 4.6 of DS20002122E, and the STATUS register (RDSR) provides real-time visibility into WEL and BP states.

Is the EUI-64™ address in the 11AA02E64T-I/TT user-programmable or factory-only?

The EUI-64™ address in the 11AA02E64T-I/TT is factory-preprogrammed and permanently stored in ROM - it cannot be altered by the user. This ensures global uniqueness and compliance with IEEE EUI-64™ standards for network interface identification. The device does not expose an address programming interface; the identity is read-only via the standard READ or CRRD commands starting at address 0x00, as confirmed in the Device Selection Table and Section 2.1 of DS20002122E.