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Description

The ST25DV04K, ST25DV16K and ST25DV64K devices (hereinafter referred collectively to as ST25DVxxx) are NFC RFID tags offering, respectively 4, 16, and 64 Kbit of electrically erasable programmable memory (EEPROM). These devices feature two interfaces: the first one is an I2C serial link that can be operated from a DC power supply, the second one is an RF link activated when the device acts as a contactless memory powered by the received carrier electromagnetic wave. In I2C mode, the user memory contains up to 512, 2048, or 8192 bytes, which can be split in four flexible and protectable areas. In RF mode, following ISO/IEC 15693 or NFC Forum Type 5 recommendations, the user memory contains up to 128, 512, or 2048 blocks of 4 bytes, which can be split in four flexible and protectable areas. The ST25DVxxx devices offer a fast transfer mode between the RF and contact worlds, thanks to a 256 bytes volatile buffer (also called Mailbox). In addition, the GPO pin provides data about incoming events, like RF field detection, RF activity in progress, or mailbox message availability. An energy harvesting feature is also available, when external conditions make it possible.

Features

I2C interface

? Two-wire I2C serial interface supports 1 MHz protocol

? Single supply voltage: 1.8 to 5.5 V

? Multiple byte programming (up to 256 bytes)

Contactless interface

? Based on ISO/IEC 15693

? NFC Forum Type 5 tag, certified by the NFC Forum

? Supports all ISO/IEC 15693 modulations, coding, sub-carrier modes and data

rates

? Custom fast read access up to 53 Kbit/s

? Single and multiple blocks read (same for extended commands)

? Single and multiple (up to 4) blocks write (same for extended commands)

? Internal tuning capacitance: 28.5 pF

Memory

? Up to 64 kbits of EEPROM (depending on version)

? I2C interface accesses bytes

? RF interface accesses blocks of 4 bytes

? Write time:

– From I2C: typical 5 ms for 1 byte

– From RF: typical 5 ms for 1 block

? Data retention: 40 years

? Write cycles endurance:

– 1 million at 25 °C

– 600 k at 85 °C

– 500 k at 105 °C

– 400 k at 125 °C

Fast transfer mode

? Fast data transfer between I2C and RF interfaces

? Half-duplex 256-byte dedicated buffer

Energy harvesting

? Analog output pin to power external components

Data protection

? User memory: one to four configurable areas, protectable in read and/or write

by three 64-bit passwords in RF, and one 64-bit password in I2C

? System configuration: protected in write by one 64-bit password in RF, and one

64-bit password in I2C

GPO

? Interruption pin configurable on multiple RF events (field change, memory write, activity, Fast Transfer end,

user set/reset/pulse)

? Open drain or CMOS output (depending on version)

Low power mode (10-ball and 12-pin packages only)

? Input pin to trigger low power mode

RF management

? RF command interpreter enabled/disabled from I2C host controller

Temperature range

? Range 6:

– From -40 to 85 °C

? Range 8:

– From -40 to 105 °C (UDFPN8 and UDFPN12 only)

– From -40 to 125 °C (SO8N and TSSOP8 only, 105 °C max on RF interface)

Package

? 8-pin, 10-ball and 12-pin packages

? ECOPACK2 (RoHS compliant)