STMicroelectronics ST25DV02K-W1R8S3

Overview

ST25DV02K-W1R8S3 from STMicroelectronics is a dynamic NFC/RFID tag IC with one PWM output, 2-Kbit EEPROM, ISO/IEC 15693 and NFC Forum Type 5 compliance, 488 Hz–31.25 kHz frequency range, ±10% accuracy over temperature, and independent 1.8–5.5 V PWM supply. It enables contactless configuration of lighting dimming, motor speed control, or sensor biasing in battery-free or hybrid-powered industrial sensors.

For engineers reviewing the ST25DV02K-W1R8S3 datasheet, ST25DV02K-W1R8S3 pinout, ST25DV02K-W1R8S3 application, or ST25DV02K-W1R8S3 equivalent, this device delivers live-updatable PWM timing via RF while maintaining full electrical isolation between contactless interface and wired PWM subsystem - critical for EMI-sensitive embedded control and secure parameter provisioning.

Technical Context

The ST25DV02K-W1R8S3 integrates two independent power domains: an RF analog front-end tuned to 13.56 MHz with internal 28.5 pF capacitance and a digitally controlled PWM generator powered by VCC (1.8–5.5 V). Its PWM engine uses a fixed-frequency internal oscillator with programmable 15-bit period and pulse width registers, delivering resolution from 9-bit at 31.25 kHz to 15-bit at 488 Hz.

Memory is partitioned into four protected user areas (including dedicated PWM_CTRL at block F8h), system configuration registers (e.g., PWM_CFG at address 03h), and TruST25 digital signature support. Boot priority logic ensures deterministic coexistence: RF activity delays PWM boot, and active PWM outputs can be dynamically placed in HiZ or throttled during RF commands via DUALITY_MNGT bits.

Key Specifications

Pinout & Package

ST25DV02K-W1R8S3 is supplied in SO8N (ECOPACK2, RoHS-compliant) package with 8-pin layout optimized for antenna coupling and PWM signal routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NXP NT3H2211W0FHKH, ST25DV02K-W1R8S3 offers superior timing accuracy and cryptographic integrity; compared with NCV8853BDR2G, it eliminates MCU dependency and enables zero-touch field updates - making it optimal for sealed, maintenance-free edge nodes.

Availability

ST25DV02K-W1R8S3 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart lighting control, motor speed tuning, and secure parameter provisioning requiring stable component supply across extended product lifecycles.

Supply support for ST25DV02K-W1R8S3 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 connectivity solutions for industrial, automotive, and consumer markets.

The ST25 Dynamic NFC tag family targets maintenance-free, battery-assisted IoT endpoints where contactless configuration, tamper-resistant memory, and mixed-signal integration reduce bill-of-materials and field service costs.

FAQ

Can ST25DV02K-W1R8S3 operate without a VCC supply?

Yes - the RF interface functions autonomously using energy harvested from the 13.56 MHz carrier field, enabling read/write of EEPROM and PWM configuration even when VCC is disconnected. However, PWM1 output remains inactive until VCC is applied and stable, as confirmed in Section 3.1 of DS12114 Rev 7.

What is the minimum RF field strength required for reliable PWM parameter updates?

The device requires ≥1.5 A/m magnetic field strength at 13.56 MHz for guaranteed command execution, per ISO/IEC 15693-3 Annex A. Field stability must exceed tRF_ON (≥1.5 ms) before issuing Write Single Block commands to F8h, and VCC must remain stable during the entire RF transaction to prevent register corruption.

How does the DUALITY_MNGT setting affect PWM output during NFC communication?

When DUALITY_MNGT = 1xx (bits 6–4), PWM1 enters high-impedance state during RF command frames (SOF to EOF); when set to 01x, output drive drops to 25% IMAX; when 0x1, PWM frequency shifts below Low_Freq threshold while preserving duty cycle. These modes prevent RF interference with sensitive analog circuits downstream of PWM1.

Is the 2-Kbit EEPROM organized as a single contiguous array?

No - memory is segmented into four distinct areas: AREA0 (1 block, CC file), AREA1 (31 blocks), AREA2 (32 blocks), and PWM_CTRL (2 blocks at F8h/F9h). AREA1 and AREA2 may be merged into one 63-block region protected by a 64-bit password, but AREA0 and PWM_CTRL retain fixed, non-relocatable addresses per Section 4.2 of the datasheet.