STMicroelectronics ST25DV02K-W1R8T3

Overview

ST25DV02K-W1R8T3 from STMicroelectronics is a dynamic NFC/RFID tag IC compliant with ISO/IEC 15693 and NFC Forum Type 5, integrating one PWM output (PWM1), 2-Kbit EEPROM, and contactless configuration capability. It operates with independent RF and wired power domains (VCC 1.8–5.5 V), delivers ±10% PWM accuracy over temperature, supports live parameter updates via RF, and features TruST25 digital signature for authentication in industrial sensor tagging and smart packaging applications.

For engineers reviewing the ST25DV02K-W1R8T3 datasheet, ST25DV02K-W1R8T3 pinout, ST25DV02K-W1R8T3 application, or ST25DV02K-W1R8T3 equivalent, this device serves as a secure, dual-interface timing and memory solution where contactless reconfiguration of analog outputs is required - especially in battery-free or low-power embedded systems with space-constrained PCB layouts.

Technical Context

The ST25DV02K-W1R8T3 implements an ISO/IEC 15693-compliant analog front-end with integrated 28.5 pF tuning capacitance, enabling direct coil connection without external matching components. Its PWM subsystem uses an internal oscillator to generate frequencies from 488 Hz to 31.25 kHz with 62.5 ns resolution, scaling bit depth from 9-bit (31.25 kHz) to 15-bit (488 Hz).

RF and PWM interfaces operate independently: the RF interface powers and communicates via AC0/AC1 antenna coils, while PWM1 is driven from VCC/VSS with push-pull topology (4 mA sink/source), configurable drive strength (¼–full), and coexistence modes (HiZ/reduced drive/frequency shift during RF commands) controlled by the PWM_CFG register.

Key Specifications

Pinout & Package

ST25DV02K-W1R8T3 is packaged in RoHS-compliant SO8N (ECOPACK2), an 8-pin surface-mount package with exposed pad for thermal stability in compact designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dynamic NFC tag with PWM output applications.

Compared with ST25DV02KC-W1R8T3, this part trades advanced crypto for lower BOM cost and identical EEPROM/PWM feature set; versus NXH3670UK/N1E, it retains full memory security architecture and independent power domains at the expense of integrated regulation.

Availability

ST25DV02K-W1R8T3 is available at Aetrix Electronics and suitable for smart industrial sensors, NFC-enabled LED drivers, secure asset tagging, and low-power motor control feedback requiring stable component supply and long-term traceability.

Supply support for ST25DV02K-W1R8T3 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and secure connectivity solutions for industrial, automotive, and consumer markets.

The ST25DV series targets secure, battery-free, and hybrid-powered IoT edge nodes - combining NFC communication, nonvolatile memory, and programmable analog outputs to simplify system-level integration in space- and power-constrained applications.

FAQ

Can ST25DV02K-W1R8T3 operate without a wired VCC supply?

Yes - the RF interface functions autonomously using energy harvested from the reader's electromagnetic field, enabling full EEPROM read/write and PWM parameter updates even when VCC is unconnected. However, PWM1 output only activates when VCC (1.8–5.5 V) is applied; without VCC, PWM1 remains in high-impedance state regardless of RF activity.

What is the minimum RF field strength required to reliably configure PWM parameters?

The device requires ≥1.5 A/m RMS magnetic field strength at 13.56 MHz for guaranteed command execution, per ISO/IEC 15693-2. Field strength below this threshold may cause incomplete Write Single Block operations to address F8h, resulting in corrupted PWM1_PERIOD or PWM1_PULSEW values - verified via post-write readback and CRC validation in application firmware.

How does the PWM coexistence mode affect timing during RF communication?

When DUALITY_MNGT = 1xx in PWM_CFG, PWM1 is forced into high-impedance during RF command frames (from SOF to EOF), introducing up to 120 µs interruption. At 31.25 kHz, this equals ≤4 missed pulses - acceptable for LED dimming but may disrupt precision motor gate timing; use 000 mode (full coexistence) if uninterrupted PWM is critical.

Is the 28.5 pF internal tuning capacitance sufficient for all antenna designs?

The 28.5 pF value targets standard 50 Ω, 1 µH–10 µH loop antennas resonating at 13.56 MHz. For custom coils with significantly different inductance or parasitic capacitance, external parallel capacitance (±2–5 pF trim) may be needed to achieve optimal Q factor and read range - confirmed via network analyzer sweep of S11 < −10 dB at 13.56 MHz.