11AA02UIDT-I/TT

Overview

The Microchip Technology 11AA02UIDT-I/TT is a 2 Kbit Serial Electrically Erasable PROM featuring a preprogrammed, unique 32-bit serial number. It utilizes the UNI/O single I/O serial interface bus with Manchester encoding for clock and data transmission on the SCIO pin. The device operates within a supply voltage range of 1.8V to 5.5V and supports an industrial temperature range of -40°C to +85°C. Memory organization is 256 x 8 bits with a page size of 16 bytes. Key electrical characteristics include a maximum bit rate of 100 kbps, typical active current of 1 mA, and maximum standby current of 1 µA. Endurance is rated at 1,000,000 erase/write cycles with data retention exceeding 200 years.

Feature Summary

• Preprogrammed 32-bit unique serial number scalable to other lengths
• Single I/O UNI/O serial interface using Manchester encoding
• Built-in write protection including power-on/off data protection and block write protection
• Low-power CMOS technology with Schmitt trigger inputs for noise suppression

Applications

• Microcontroller system identification
• Secure authentication in embedded devices
• Inventory tracking and serialization
• Configuration storage requiring unique device IDs

Procurement Notes

Verify the specific suffix 'I/TT' corresponds to the Industrial temperature range (-40°C to +85°C) and SOT-23-3 package as documented in the official datasheet. Confirm that the preprogrammed 32-bit serial number is factory-set and non-modifiable. Ensure compatibility with the UNI/O protocol implementation in the host microcontroller. Check for RoHS compliance status if required by regulatory standards.

Selection Notes

Select this component when a unique hardware identifier is required for each unit without external programming overhead. The UNI/O interface minimizes pin count to three (SCIO, VCC, VSS), suitable for space-constrained designs. Consider the 1.8V minimum operating voltage for low-power applications. The 16-byte page buffer facilitates efficient sequential writes. Verify that the host controller can generate the specific Manchester-encoded timing required by the UNI/O protocol.

Part Context

The 11AA02UID belongs to Microchip's UNI/O serial EEPROM family, distinguished by its factory-programmed unique ID feature. Unlike standard EEPROMs, this variant integrates a permanent serial number for device identification. It shares the same physical footprint and interface as other 11AA02 series parts but adds security and traceability functions. The device complements Microchip's broader memory portfolio by offering a compact solution for secure embedded systems.

Replacement Considerations

Direct substitutes within the same family include the 11AA020T-I-TT for standard EEPROM functionality without the unique ID. For different densities, consider the 11LC010T-I/TT or 11LC020T-I/TT, though these lack the preprogrammed serial number. Ensure any replacement maintains the SOT-23-3 package and UNI/O interface compatibility.

FAQ

Can the preprogrammed 32-bit serial number be modified?

No, the 32-bit serial number is factory-programmed and permanently stored in the device. It cannot be altered by the user.

What is the function of the SCIO pin?

The SCIO pin serves as the single bidirectional serial clock and data input/output line for the UNI/O interface, using Manchester encoding to combine clock and data signals.

How does the device handle write protection?

The device features block write protection via the STATUS register, allowing users to protect none, the upper 1/4, the upper 1/2, or all of the memory array. It also includes built-in power-on/off data protection.