Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.
my application is NFC readers (ST25R3920B) polls whether there is an approaching card. Qi wireless charger searching devices with analog/digital ping, and start Qi wireless charging if WC device is found.I found the chips (ST25R3920B) is always broke...
We would prefer to not use SPI to interface to a NFC reader as we are I/O and peripheral constrained here.I didn't see I2C as an option for any of the ST25R95, ST25R3911B or CR95HF. UART is an option for the CR95HF, but it is not available for it's s...
Hello,Does sourcing the MCU clock from the ST25R3916(B) improve the RX sensitivity in card emulation mode? Is the strongest external load modulation obtained by setting the drain resistor (R301 in the X-NUCLEO-06A1/08A1) to zero?AN5768 states that th...
In follow up to my earlier question on reading Mailbox Memory from our iOS app, we are trying to pass the Read Msg command, but looks like this needs address flag set and UID needs to be passed. But when we try to pass the address flag and UID along ...
Hello, I have one ST25R3916B which is connected to 16 PCB spiral antennas, through DPST relays. It works well. To select the antenna I want to use I just power that relay and leave the other relays off. However, the sound of the relays clicking is no...
I have a specific application where I need to detect the presence (or absence) of a ISO15683 tag at a range of about 10 cm using a Molex 146236-2102 NFC Antenna. Is there an appropriate STMicro product?
We are working with ST25RU3993 eval board and controlling it from linux based STUHFL C code base.Could you please suggest best config for reading weakest tags with ST25RU3993 using C code base.
I thought I could send custom commands to the ST25DV Tag by using the NFC Tap app. Is that possible?In the app there are two fields when I chose "Custom":1) Custom Command. There I enter "AC", to Read Message (mailbox).2) Data: what to enter here? Ca...
I'm considering a ST25R3916B design to emulate a 14443 A&B device and preferably be powered by the field. It's not at all clear from the datasheet what the current draw is when not operating in an Active mode - there's a big gap between 4uA in Initi...
I'm USING ST25DV04 WITH STM32WB THROUGH 12C BUS.IAM ABLE TO WRITE FROM MCU AND READ IT IN APP,AND ALSO ABLE TO WRITE THROUGH APP INTO THE MEMORY,BUT COULDN'T READ THE SAME THING WHAT I WRITE IN THE APP.I CAN ONLY READ SAME GARBAGE VALUE OR ZERO