Microchip Technology ATA5577M1330C-UFPW

Overview

ATA5577M1330C-UFPW from Microchip Technology (formerly Atmel) is a contactless 125–134 kHz LF RFID read/write identification IC with 363-bit EEPROM, load modulation uplink, OOK pulse-interval downlink, and on-chip antenna capacitor trimming. It operates in Basic or Extended mode and supports ISO/IEC 11784/11785 compatibility for animal ID and access control transponders.

For engineers reviewing the ATA5577M1330C-UFPW datasheet, ATA5577M1330C-UFPW pinout, ATA5577M1330C-UFPW application, or ATA5577M1330C-UFPW equivalent, key selection criteria include RF frequency range (100–150 kHz), EEPROM block structure (11 × 33-bit blocks with lock bits), coil interface tolerance, modulator protocol support (Manchester, bi-phase, FSK, PSK, NRZ), and compatibility with T5557/ATA5567 configuration registers.

Technical Context

The ATA5577M1330C-UFPW integrates an analog front end with rectifier, clock extractor, field-gap detector, and switchable load modulation between Coil 1 and Coil 2. Its HV generator enables EEPROM programming without external high-voltage sources, and the data-rate generator supports binary-programmable rates from RF/2 to RF/128 plus fixed Basic mode rates (RF/8, RF/16, etc.).

Memory is organized into two pages: Page 0 (8 blocks) holds configuration and user data; Page 1 (4 blocks) contains traceability data and analog option settings. Block 0 stores mode/configuration data not transmitted during reads, while Block 7 of Page 0 may serve as a write-protection password - all blocks include individual lock bits that permanently disable reprogramming once set.

Key Specifications

Pinout & Package

ATA5577M1330C-UFPW is supplied in a bare die format with 200 µm × 400 µm pad layout optimized for direct coil bonding (ATA5577M2 variant). No wire-bonding pads or leadframe are included.

Key Features

Applications

Equivalent & Alternatives

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

Compared with T5557 and ATA5567, the ATA5577M1330C-UFPW provides verified on-chip 330 pF capacitance and M2 pad geometry for direct coil bonding - reducing external component count and enabling tighter antenna integration in compact transponder modules without sacrificing protocol flexibility or EEPROM security.

Availability

ATA5577M1330C-UFPW is available at Aetrix Electronics and suitable for access control, animal identification, and industrial asset tracking applications requiring stable component supply, long-term data retention, and LF RFID protocol flexibility.

Supply support for ATA5577M1330C-UFPW 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 support for its legacy RFID product portfolio, including design resources, application notes, and qualification data.

The ATA5577 series was developed as a drop-in upgrade path for T555x and e555x transponder ICs, targeting high-reliability, battery-free identification in harsh environments where mechanical durability and long-term data integrity are critical.

FAQ

What is the primary function of the ATA5577M1330C-UFPW in an RFID system?

The ATA5577M1330C-UFPW serves as a passive, contactless read/write identification IC (IDIC®) operating at 125–134 kHz. It harvests power from the reader's RF field via a single coil, stores data in 363-bit EEPROM, and communicates using load modulation (uplink) and pulse-interval-encoded OOK commands (downlink). The ATA5577M1330C-UFPW is designed for transponder applications where no onboard power source is permitted.

Does the ATA5577M1330C-UFPW support ISO/IEC 11784 and 11785 standards?

Yes, the ATA5577M1330C-UFPW is configurable for ISO/IEC 11784/11785 compatibility through its mode register settings. This enables compliance with both FDX-B (full-duplex) and HDX (half-duplex) animal identification protocols, as well as access control formats requiring specific modulation and timing parameters defined in those standards. Configuration is performed via EEPROM block 0, and the ATA5577M1330C-UFPW supports all required data structures and transmission modes.

What is the significance of the "M1330" suffix in ATA5577M1330C-UFPW?

The "M1330" suffix denotes the mask option specifying a nominal on-chip resonance capacitor value of 330 pF ±10 pF and the ATA5577M2 pad geometry (200 µm × 400 µm) optimized for direct coil bonding. This distinguishes it from M1 variants (100 µm × 100 µm, 320 pF) and ensures precise LC tank tuning without external capacitors. The ATA5577M1330C-UFPW leverages this fixed capacitor to improve production yield and reduce antenna calibration effort.

How does the ATA5577M1330C-UFPW handle EEPROM write protection?

The ATA5577M1330C-UFPW implements per-block write protection using a dedicated lock bit in each of its 11 × 33-bit EEPROM blocks. Once a lock bit is set (programmed to '1'), the entire block-including the lock bit itself-becomes permanently read-only and cannot be reprogrammed via the RF field. This allows selective protection of configuration data (Block 0), passwords (Block 7 of Page 0), or traceability fields (Blocks 1–2 of Page 1) while leaving other blocks user-writable. The ATA5577M1330C-UFPW enforces this at the hardware level during write command execution.

Can the ATA5577M1330C-UFPW replace the T5557 or e5551 in existing designs?

Yes, the ATA5577M1330C-UFPW is explicitly designed as a functional replacement for T5557 and e5551/T5551 in most common operation modes, with identical configuration register structure and Basic/Extended mode behavior. However, due to its integrated 330 pF capacitor and M2 pad layout, PCB or coil bonding changes may be required. The ATA5577M1330C-UFPW retains full command-set compatibility but adds ISO configurability and enhanced antenna tolerance - validation in the target reader environment is recommended before full migration.