Hardware description and configuration
2 Hardware description and configuration
The X-NUCLEO-NFC04A1 expansion board allows the user to test the functionality of the
ST25DV04K NFC Type V/RFID tag IC with a dual-interface 4 kBit electrically erasable
programmable read-only memory (EEPROM) that also features an I²C interface.
The EEPROM is organized in blocks of 512 bytes, arranged by pages of 4 bytes in I²C
mode, and in 128 blocks of 4 bytes in RF mode. It can be powered by STM32 Nucleo
board or directly by the received carrier electromagnetic field.
The ST25DV04K features a low power down (LPD) pin, a general purpose output (GPO)
and an energy harvesting feature that lets you output the energy coming from the RF field
on the Vout analog pin and acts on ST1 jumper to enable it.
The ST25DV04K can act as a mailbox in fast transfer mode in both directions between the
RF terminal (such as an e-reader or a smart phone) and the microcontroller through the
I²C. In this case, messages are stored in the RAM instead of EEPROM. This mode allows
exchanging up to 256 byte payload data via RF and I²C interfaces.
A user configurable output pin can also be used as an interrupt for the microcontroller, and
toggles during field change
(e.g., RF Busy, MailBox filled, EEPROM update, RF user
Interrupt and RF User Set/Reset).
ST25DV04K device standby current consumption can be further lowered using the Low
Power Down input pin that switches the ST25DV04K internal LDO off
.
These functions can be exploited using the firmware package contained in the X-CUBE-
NFC4 software
.
The STM32 Nucleo and the X-NUCLEO-NFC04A1 boards are connected through
connectors CN5, CN6, CN8 and CN9, as detailed in the following tables.
Table 1: Interconnections between the STM32 Nucleo board and the X-NUCLEO-NFC04A1
expansion board (left side)
STM32 Nucleo board
(MCU port)
X-NUCLEO-NFC04A1
expansion board
available even when RF is disabled
See Table 2: "Interconnections between the STM32 Nucleo board and the X-NUCLEO-NFC04A1 expansion
board (right side)"
To program the microcontroller on the STM32 Nucleo board refer to user manuals UM1724," STM32 Nucleo-64
board", and UM1725, "Description of STM32F4 HAL and LL drivers", available on www.st.com.
