STMicroelectronics ST25DV-PWM-ESET

Overview

ST25DV-PWM-ESET from STMicroelectronics is a ready-to-use evaluation board based on the ST25DV02K-W2 dynamic NFC/RFID tag IC with dual PWM outputs, 2-Kbit EEPROM, ISO/IEC 15693/NFC Forum Type 5 compliance, and TruST25™ digital signature authentication. It features a 22 × 38 mm² etched single-layer inductive antenna and two LEDs visualizing PWM duty cycle for rapid prototyping of contactless parameter tuning in industrial sensors and smart labels.

For engineers reviewing the ST25DV-PWM-ESET datasheet, ST25DV-PWM-ESET pinout, ST25DV-PWM-ESET application, or ST25DV-PWM-ESET equivalent, this kit enables live contactless update of PWM parameters via NFC mobile phone or RFID reader - critical for secure, field-programmable timing control in battery-free IoT edge nodes.

Technical Context

The board implements the ST25DV02K-W2 IC, which integrates an ISO/IEC 15693-compliant RF interface with 28.5 pF internal tuning capacitance and dual independently programmable PWM generators. Memory is partitioned into up to four independent areas, each supporting TruST25™-based authentication.

Power is harvested exclusively from the 13.56 MHz RF field; no external supply is required. PWM output frequency range is 1 Hz to 250 kHz, with 0.1% duty cycle resolution and contactless write capability for real-time parameter updates without physical connection.

Key Specifications

Availability

ST25DV-PWM-ESET is available at Aetrix Electronics and suitable for NFC-enabled industrial sensor calibration, smart packaging validation, and battery-free IoT actuator prototyping requiring stable component supply and field-upgradable timing control.

Supply support for ST25DV-PWM-ESET 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 designing and manufacturing microcontrollers, analog ICs, MEMS, and smart power devices for industrial, automotive, and consumer applications.

The ST25DV product line delivers dynamic NFC tags with embedded memory and programmable peripherals (e.g., PWM, GPIO, sensors) to enable secure, maintenance-free, contactless configuration of edge devices.

FAQ

Does ST25DV-PWM-ESET require an external power supply?

No. The board operates solely on energy harvested from the 13.56 MHz RF field generated by an ISO/IEC 15693-compatible reader or NFC smartphone. The ST25DV02K-W2 IC integrates RF-to-DC conversion and regulates internal logic and PWM output drive from this harvested power - enabling true battery-free operation.

Can PWM parameters be updated after deployment?

Yes. PWM frequency, duty cycle, and enable state can be modified contactlessly at any time using standard NFC commands. Updates are authenticated via TruST25™ digital signatures, ensuring only authorized devices can reconfigure timing behavior - essential for field-deployed smart labels and calibrated sensors.

What is the role of the two onboard LEDs?

The LEDs provide immediate visual feedback of each PWM output's active state and relative duty cycle. One LED maps to PWM1, the other to PWM2; brightness correlates directly with duty cycle percentage. This allows rapid verification of contactless programming without test equipment during development or field commissioning.

Is antenna tuning required before use?

No. The 22 × 38 mm² single-layer etched antenna is pre-matched to the ST25DV02K-W2's 28.5 pF internal tuning capacitance. No external capacitors or impedance adjustments are needed - the board achieves optimal RF coupling and read range out-of-the-box with standard ISO/IEC 15693 readers.