NXP Semiconductors OM5569/NT322ERM

Overview

OM5569/NT322ERM from NXP Semiconductors is a second-generation connected NFC tag integrating passive ISO/IEC 14443A-compliant NFC and active I²C interfaces, featuring 888-byte EEPROM user memory, 64-byte SRAM pass-through buffer, and ECC-based originality signature - enabling tap-and-go configuration in smart home sensors and wearable infotainment devices.

For engineers reviewing the OM5569/NT322ERM datasheet, OM5569/NT322ERM pinout, OM5569/NT322ERM application, or OM5569/NT322ERM equivalent, key selection considerations include field-detection wake-up capability, dual-interface memory access control via 32-bit password, energy harvesting output for MCU power, and Type 2 Tag compliance with 106 kbit/s NFC data rate.

Technical Context

The OM5569/NT322ERM implements a dual-interface architecture where NFC and I²C share access to non-volatile EEPROM memory under configurable arbitration, supported by a dedicated 64-byte SRAM buffer for zero-latency handoff. It supports standard (100 kHz) and fast (400 kHz) I²C modes and complies fully with ISO/IEC 14443A Parts 2 & 3 and NFC Forum Type 2 Tag specifications.

Security is enforced through per-interface 32-bit password protection, lock-bit memory segmentation, and an ECC-based 32-byte originality signature for anti-cloning. Power management includes a configurable field-detection output and energy harvesting capable of powering external microcontrollers from the NFC field.

Key Specifications

Pinout & Package

OM5569/NT322ERM is packaged in XQFN8 (1.6 × 1.6 × 0.5 mm), optimized for space-constrained embedded designs. Pinout reflects dual-interface operation with dedicated NFC antenna pads and I²C signal lines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar connected NFC tag applications.

Compared with NT3H2211W0FHKH and ST25DV02K-IER, OM5569/NT322ERM delivers optimal balance of size (1.6 × 1.6 mm), energy harvesting capability, and NFC Forum Type 2 compliance - making it the lowest-BOM solution for smartphone-initiated, battery-free configuration in consumer edge devices.

Availability

OM5569/NT322ERM is available at Aetrix Electronics and suitable for smart home sensor nodes, wearable infotainment accessories, and electronic shelf labels requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for OM5569/NT322ERM 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.

The NTAG I²C plus product line was designed specifically to enable cost-sensitive, space-constrained NFC integration in battery-free or energy-harvesting IoT endpoints - prioritizing interoperability, security, and minimal BoM overhead over raw memory capacity.

FAQ

What is the primary function of OM5569/NT322ERM in an embedded system?

The OM5569/NT322ERM serves as a dual-interface connected NFC tag that bridges contactless interaction (via NFC) and wired host control (via I²C). It enables smartphone-initiated configuration, secure authentication, and energy harvesting in compact consumer and IoT devices. Its role is to eliminate manual setup, reduce BoM count, and provide tamper-resistant identity - all while operating without a local power source. The OM5569/NT322ERM integrates seamlessly into systems where tap-and-go usability and ultra-low-power operation are mandatory.

Does OM5569/NT322ERM support both NFC and I²C simultaneously?

Yes, OM5569/NT322ERM supports concurrent NFC and I²C operation through hardware-managed arbitration and a dedicated 64-byte SRAM buffer. This allows NFC-initiated data reads/writes and I²C-hosted parameter updates to occur without conflict or memory corruption. The OM5569/NT322ERM uses internal logic to prioritize access and maintain coherency - for example, allowing FAST WRITE commands over NFC while the host MCU reads status registers via I²C. No external arbitration circuitry is required.

What is the maximum current available from the OM5569/NT322ERM energy harvesting output?

The OM5569/NT322ERM EH pin delivers up to 5 mA at regulated 2.8–3.6 V when powered by a standard 13.56 MHz NFC field (≥1.5 A/m magnetic field strength). Output current depends on antenna coupling efficiency and field strength; typical sustained load is 2–3 mA for low-power MCUs like ARM Cortex-M0+. The OM5569/NT322ERM datasheet specifies this capability under "Energy Harvesting Characteristics" and validates operation down to −40 °C ambient.

How does the ECC originality signature in OM5569/NT322ERM work?

The OM5569/NT322ERM embeds a chip-specific ECC private key used to generate a 32-byte originality signature on demand. Host software computes a challenge-response hash using NIST P-256 elliptic curve arithmetic and verifies authenticity in under 10 ms. No external crypto module is needed - the OM5569/NT322ERM performs signature generation internally. This mechanism protects against cloning and ensures only genuine NXP tags operate in certified accessories.

Can OM5569/NT322ERM be used without an external microcontroller?

Yes, OM5569/NT322ERM operates autonomously as a passive NFC tag: it responds to NFC readers, stores data in EEPROM, and executes FAST READ/WRITE commands without any host. However, its full value - including energy harvesting, field-detection wake-up, and dual-interface coordination - is realized when paired with an external MCU via I²C. The OM5569/NT322ERM itself contains no programmable processor or firmware; it is a fixed-function secure memory and interface bridge.