The ST25R3911B-AQFT is a NFC (Near Field Communication ) Reader IC from STMicroelectronics. It supports a wide variety of NFC standards and is used in applications such as contactless card readers, payment terminals, and industrial solutions.
Packaging and Pinout Details:
The ST25R3911B-AQFT comes in a QFN-48 (Quad Flat No-lead, 48 pins) package. Below is the detailed explanation of its pin function, including all 48 pins and their respective roles in the circuit.
Pin Function Table for the ST25R3911B-AQFT: Pin Number Pin Name Pin Function Description 1 VDDIO Power supply for IO circuitry 2 VSS Ground 3 VDD Power supply for core functionality 4 VSS_OUT Ground reference for external components 5 RESETB Reset pin (active low) 6 SWDIO Serial Wire Debug IO pin 7 SWCLK Serial Wire Debug Clock pin 8 RF _IO antenna connection for NFC communication 9 RF_GND Ground for RF section 10 IRQ_N Interrupt request pin (active low) 11 I2C_SDA I2C data line for communication 12 I2C_SCL I2C clock line for communication 13 SPI_MISO SPI master-in slave-out pin 14 SPI_MOSI SPI master-out slave-in pin 15 SPI_CLK SPI clock line 16 SPI_CS SPI chip select pin 17 UART_TX UART transmit pin 18 UART_RX UART receive pin 19 GND_RF Ground for RF section 20 VDD_RF Power supply for RF section 21 VDD_EXT External power supply pin 22 VSS_EXT External ground pin 23 SDA Data line for I2C communication 24 SCL Clock line for I2C communication 25 SDI SPI Data In (MISO) 26 SDO SPI Data Out (MOSI) 27 SCLK SPI Clock 28 RSTB Reset (active low) 29 TEST Test pin for debugging 30 NC No Connection 31 NC No Connection 32 NC No Connection 33 VSS_RF Ground for RF section 34 VDDIO_EXT External voltage supply for I/O circuitry 35 NC No Connection 36 NC No Connection 37 NC No Connection 38 NC No Connection 39 VDDRFEXT External voltage supply for RF 40 NC No Connection 41 NC No Connection 42 NC No Connection 43 NC No Connection 44 VSSRFEXT External ground for RF 45 NC No Connection 46 NC No Connection 47 NC No Connection 48 NC No Connection FAQs (Frequently Asked Questions) about ST25R3911B-AQFT What is the ST25R3911B-AQFT used for? The ST25R3911B-AQFT is used in applications requiring NFC and RFID communication, such as contactless payments, access control systems, and industrial solutions. What are the communication protocols supported by ST25R3911B-AQFT? The ST25R3911B-AQFT supports I2C, SPI, and UART communication protocols. How is the ST25R3911B-AQFT powered? The IC is powered through the VDD pin, with the power input typically provided at 3.3V to 5V. Can I use the ST25R3911B-AQFT with a 5V power supply? Yes, it supports a wide voltage range (3.3V to 5V) for its power supply. What is the function of the RESETB pin? The RESETB pin is used to reset the chip. It is active low, meaning the chip will reset when this pin is pulled low. What is the purpose of the IRQ_N pin? The IRQ_N pin is an interrupt request pin used to notify the microcontroller or other systems of events such as NFC communication completion. What does the RF_IO pin do? The RF_IO pin is used for connecting to the antenna for NFC communication. It handles the radio frequency signals. How does the chip communicate with a microcontroller? The ST25R3911B-AQFT communicates with a microcontroller using I2C, SPI, or UART interface s. What is the maximum data rate for communication? The IC supports data rates up to 848 kbps for NFC communication.What type of antenna should I use with the ST25R3911B-AQFT?
The antenna should be designed based on the IC’s specifications, typically using a loop or coil for efficient NFC communication.How do I connect the ST25R3911B-AQFT to my system?
The IC can be connected via I2C, SPI, or UART lines, ensuring appropriate connections for data, clock, and reset pins.Can the ST25R3911B-AQFT be used for both reading and writing NFC tags?
Yes, it can be used for both reading and writing NFC tags, depending on the application.What is the voltage range for the VDD pin?
The VDD pin supports a voltage range of 3.3V to 5V.Is the ST25R3911B-AQFT capable of supporting multiple NFC tags at once?
Yes, it can communicate with multiple NFC tags using standard NFC communication protocols.Can the ST25R3911B-AQFT operate in a battery-powered system?
Yes, the low power consumption of the ST25R3911B-AQFT makes it suitable for battery-operated systems.What is the function of the RF_GND pin?
The RF_GND pin provides a ground reference for the RF section of the IC.How do I reset the ST25R3911B-AQFT?
To reset the IC, you can pull the RESETB pin low for a brief period.What is the SPI clock speed for the ST25R3911B-AQFT?
The SPI clock speed is typically up to 10 MHz, but it depends on the specific configuration and microcontroller.What is the operating temperature range of the ST25R3911B-AQFT?
The typical operating temperature range is -40°C to +85°C.Does the ST25R3911B-AQFT support encryption?
Yes, it includes features to secure NFC communication through encryption standards.This concludes the detailed pin function and FAQ section for the ST25R3911B-AQFT NFC Reader IC. Please note that further information might be available in the specific datasheet provided by STMicroelectronics for precise technical details.