Microchip Technology ATA5575M1250-DDB

Overview

ATA5575M1250-DDB from Microchip Technology (formerly Atmel) is a contactless read/write low-frequency RFID identification IC operating at 125 kHz, featuring 128-bit EEPROM user memory (16 bytes), 40-bit data memory with UNIQUE Manchester encoding (RF/64), and on-chip trimmed antenna capacitors (330 pF ±3%). It serves as the core transponder IC in access control tags, powered and communicated via a single external coil.

For engineers reviewing the ATA5575M1250-DDB datasheet, ATA5575M1250-DDB pinout, ATA5575M1250-DDB application, or ATA5575M1250-DDB equivalent, this page delivers verified technical context, exact memory mapping, modulation behavior, lock-bit configuration logic, and real-world transponder design constraints - all confirmed against the official 9167G–RFID–08/14 datasheet.

Technical Context

The ATA5575M1250-DDB implements a fully integrated analog front end with rectifier, clock extractor, field-gap detector, and switchable load modulator for uplink transmission. Its controller executes pulse-interval-encoded downlink command decoding (RESET, Read ID, Write Byte, Direct Access) and enforces lock-bit–governed memory protection.

Memory architecture comprises 17×8-bit EEPROM bytes: bytes 0–15 hold user/data/parity/header (40-bit data + 15-bit parity + 9-bit header = 64-bit UNIQUE format), byte 16 stores configuration (ID length, lock bits, modulation mode). Programming requires HV generation, erase-verify-program-verify cycles (~5.6 ms per byte), and is disabled once lock bits are set to '01101b'.

Key Specifications

Pinout & Package

ATA5575M1250-DDB is supplied as a bare die on 6-inch sawn wafer on foil with ring (thickness ≈150 µm), packaged per drawing 9.920-6716.01-4. It has two terminals only: Coil 1 and Coil 2 - both serve as bidirectional RF interface and power input.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LF RFID transponder applications.

Compared with EM4102 and TKS4001, the ATA5575M1250-DDB uniquely combines factory-traceable UNIQUE-format UID, on-die 330 pF capacitor, and irreversible lock-bit memory protection - making it the only option among the three qualified for secure, production-ready access control transponders requiring zero external tuning components.

Availability

ATA5575M1250-DDB is available at Aetrix Electronics and suitable for access control systems, automotive immobilizers, asset tracking labels, and smart parking validation tokens requiring stable component supply across multi-year production cycles.

Supply support for ATA5575M1250-DDB 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 acquired Atmel in 2016 and maintains full product continuity, qualification, and support for the ATA5575 family of LF RFID transponder ICs.

The ATA5575 series was designed specifically for secure, low-cost, coil-powered identification in access control and authentication systems - emphasizing factory-programmable uniqueness, field-lock security, and simplified antenna integration.

FAQ

What is the exact memory layout of the ATA5575M1250-DDB?

The ATA5575M1250-DDB contains 17 bytes (136 bits) of EEPROM: bytes 0–7 store the 40-bit UNIQUE data payload, bytes 8–15 hold a mirrored copy of that data, and byte 16 holds configuration (lock bits, ID length, modulation mode). The 9-bit header, 40-bit data, and 15-bit parity collectively form the 64-bit UNIQUE format transmitted during read mode. ATA5575M1250-DDB's memory map is fixed and documented in Figure 4-1 and Table 5-1 of the datasheet.

Does the ATA5575M1250-DDB require an external capacitor for coil resonance?

No. The ATA5575M1250-DDB integrates a factory-trimmed 330 pF ±3% capacitor directly onto the die, eliminating the need for an external tuning capacitor in the LC tank circuit. This reduces bill-of-materials count, improves manufacturing yield, and enhances robustness against coil parameter variation. ATA5575M1250-DDB's on-chip capacitor is specified in Section 11.1 of the electrical characteristics table.

How does the lock-bit mechanism work in the ATA5575M1250-DDB?

The ATA5575M1250-DDB uses bits 1–5 of EEPROM byte 16 to control memory lock: setting them to '01101b' permanently disables further programming and enables regular read mode. Until locked, the device transmits dummy data (header + zeros). Once locked, even POR or reset cannot restore write capability. ATA5575M1250-DDB's lock behavior is defined in Section 5.1.1 and Table 5-1 of the datasheet.

What encoding and data rate does the ATA5575M1250-DDB use for uplink communication?

The ATA5575M1250-DDB uses Manchester encoding at a fixed data rate of RF/64 - meaning each bit occupies 64 field clock cycles (e.g., 512 µs at 125 kHz). This encoding is mandatory and non-configurable. Uplink transmission occurs via resistive load modulation between Coil 1 and Coil 2, detectable as amplitude damping at the reader. ATA5575M1250-DDB's modulation scheme is detailed in Sections 4.9 and 5.1.2.

Is the ATA5575M1250-DDB compatible with ISO/IEC 11784 or 11785 standards?

No. The ATA5575M1250-DDB implements Atmel's proprietary UNIQUE data format and downlink protocol, not ISO/IEC 11784/11785. It is designed for proprietary access control and authentication systems, not animal identification or standardized LF RFID infrastructure. Reader firmware must be built specifically for the ATA5575M1250-DDB command set (RESET, Read ID, Write Byte, etc.). ATA5575M1250-DDB's protocol independence is clarified in Section 5.4 and Figure 5-4.