STMicroelectronics ST25DV-PWM NFC Dynamic tag ICs

ST25DV-PWM NFC Dynamic tags from STMicroelectronics introduce an innovative contactless way to program presets for products on the production line or in situ, and are designed to simplify set-up or fine-tuning at the point of use. 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, the dynamic tag ICs generate control signals using an embedded pulse-width/period mechanism based on settings received via the (NFC Type 5 and ISO/IEC 15693 compliant) 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 fly, while the device is operating.

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

PWM parameters can be updated via the contactless interface at any time during the manufacturing, distribution, installation or maintenance process. The Dynamic NFC tags provide multiple features for protecting assets and data, including the TruST25 digital-signature mechanism for authentication. In addition, independent 32/64-bit password-protected domains prevent unauthorised access to the tag’s EEPROM.

Two different package types are available, presenting a choice of TSSOP-8 or SO-8.

For more information: http://www.st.com/st25dv-pwm.