onsemi SPS1M002B

Overview

SPS1M002B from ON Semiconductor is a battery-free UHF RFID sensor tag designed for direct moisture sensing on non-metal surfaces, operating in the ETSI 866–868 MHz band, with −16 dBm read sensitivity, 5-bit sensor code resolution (0–31), and integrated RSSI measurement. It leverages the RF Micron Magnus-S2® Sensor IC with self-tuning Chameleon engine for environmental adaptation.

For engineers reviewing the SPS1M002B datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, ETSI-band-specific performance data, moisture-sensing calibration behavior, memory bank configuration options, and reader interoperability requirements per EPC Gen 2 v2.0.0.

Technical Context

The SPS1M002B integrates the Magnus-S2® RFID IC with a patented Chameleon engine that dynamically adjusts input impedance via 32-level capacitor tuning to maximize reflected power under varying moisture conditions. Its sensor code (B0h–BFh) reflects real-time antenna detuning caused by moisture contact, digitized as a 5-bit value (0–31).

It supports full EPCglobal Gen 2 v2.0.0 (ISO 18000-6C) compliance, including 64-bit TID, 128-bit EPC, and 144-bit user memory - configurable as EPC extension - plus on-chip RSSI measurement (5-bit code, D0h–DFh) and threshold-based selective interrogation via SELECT command with MemBank=3h and Pointer=A0h.

Key Specifications

Pinout & Package

SPS1M002B is a monolithic RFID sensor tag in Case 888AE package: 101.60 × 31.75 mm flexible label format with aluminum antenna embedded in 0.076 mm PET tape. No discrete pins - RF coupling occurs via integrated antenna terminals (RF1/RF2) connected internally to the Magnus-S2 die. Antenna dimensions define impedance matching and moisture-sensitive region per Figure 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar passive UHF moisture sensing applications.

Compared with SPS1M002A and RFM2020-ETSI, the SPS1M002B uniquely combines ETSI-band operation with the Magnus-S2's self-tuning Chameleon engine and on-chip RSSI - enabling robust, frequency-adaptive moisture detection and reader-side proximity filtering without external components or firmware modifications.

Availability

SPS1M002B is available at Aetrix Electronics and suitable for medical device monitoring, industrial asset tracking, and facilities management applications requiring stable component supply, regulatory-compliant UHF operation, and maintenance-free passive sensing.

Supply support for SPS1M002B 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and medical markets.

The SPS1M002B belongs to ON Semiconductor's Smart Passive Sensor family, co-developed with RF Micron to deliver battery-free, RFID-integrated environmental sensing for asset integrity and condition monitoring in regulated environments.

FAQ

What is the operating frequency range of the SPS1M002B?

The SPS1M002B operates exclusively in the ETSI-defined UHF band of 866–868 MHz. This frequency range ensures regulatory compliance for use in Europe and other ETSI-aligned regions. Unlike the SPS1M002A variant, the SPS1M002B is not certified for FCC-band operation and will not reliably communicate with readers tuned outside the 866–868 MHz window.

How does the SPS1M002B detect moisture without a battery or external power?

The SPS1M002B harvests RF energy from a compatible ETSI-band UHF reader to power the internal Magnus-S2® IC. Moisture alters the antenna's resonant frequency and impedance, which the Chameleon engine detects via real-time tuning adjustments - digitized as a 5-bit sensor code (0–31) stored in Reserved memory address B0h–BFh. No external power source is required.

Can the SPS1M002B be used with standard EPC Gen 2 readers?

Yes, the SPS1M002B is fully compliant with EPCglobal Class 1 Gen 2 v2.0.0 (ISO 18000-6C) specifications. It supports standard commands including READ, WRITE, LOCK, and SELECT - including advanced features like On-Chip RSSI Request using MemBank=3h and Pointer=A0h. No proprietary reader firmware is needed.

What is the meaning of the sensor code value returned by the SPS1M002B?

The SPS1M002B returns a 5-bit sensor code (0–31) reflecting the current tuning state of its Chameleon engine. A dry baseline averages ~18; moisture contact typically lowers the code by ~5 units. Because tuning shifts across frequency (±5 codes over 866–868 MHz), reader software must correlate sensor code with actual read frequency to ensure consistent wet/dry discrimination.

Does the SPS1M002B support password protection and memory locking?

Yes, the SPS1M002B implements full EPC Gen 2 security features: a 32-bit Access Password (default 0000h) stored at Reserved addresses 20h–3Fh, and a 32-bit Kill Password (default 0000h) at 00h–1Fh. Both passwords can be written and used to restrict memory access or permanently disable the tag - critical for secure medical or industrial deployments where tag tampering must be prevented.