NFC dynamic tag ICs from STMicroelectronics

STMicroelectronics has introduced a contactless way to program presets for products on the production line or in-situ and simplify setup or fine-tuning at the point of use, with its ST25DV-PWM NFC dynamic tags.

The dynamic tag ICs target all applications featuring PWM (Pulse Width Modulation)-based controllers, such as lighting products, motorised appliances, fans, and thermostats, using an ISO15693 RFID reader or NFC-enabled smartphone or other mobile device.

Combining ST’s NFC technology with PWM logic for the first time, the dynamic tag ICs generate control signals using an embedded pulse-width/period mechanism based on settings received via the RFID interface and stored in on-chip EEPROM. The PWM outputs work as soon as the PWM block of the device is powered up and operate independently from RF activity. The PWM configuration can be modified via the NFC interface on the go, while the device is operating.

Two variants, the ST25DV02K-W1 and ST25DV02K-W2, allow a choice of single or dual 4mA push-pull PWM outputs for dimming control of up to two LED lights or adjusting the speed of up to two motors independently. The PWM generator has pulse-width resolution of 62.5ns, equivalent to 15-bit resolution at the lowest frequency of 488Hz and 9 bits at the 31.25kHz maximum. The operating temperature range is from -40°C to 105°C, and the tags don’t require any external oscillator or other components except a power supply decoupling capacitor.

Author
Amy Best