The EMC cutoff frequency of ST25R3911B is defined as 11.75MHz with L= 270 nH, C= 680p. However, the antenna resonates at 13.56MHz. I can understand if the cutoff frequency is defined between 14 -18 MHz to suppress the 2rd harmonic mode. Could you gi...
ST25R3917 doesn't commnicate on the I2C (Address 0x50) it seems like the chip doesn't start. Maybe a problem with the crystal?- Drawn current is 50uA- Signal on MCU_CLK is a 32.5kHz Squarewave- IRQ line stays lowI assume that the capacitance on the 2...
With the ST25R3916, how can filtering of the 3rd harmonic (40.5 MHz) be improved? Following the procedure outlined in AN5276, a matching network was made. Performance of the device was verified, and emissions in the 13.56 MHz band are within FCC limi...
We are communicating with the st25r3916 chip normally.But after about 14 minutes,The value of the IRQ pin is maintained at HIGH.You fall into an infinite loop in the function st25r3916CheckForReceivedInterruptts().What is the problem ?please I'd appr...
Hi,I'm not able to use the GUI (W7). The DFU driver is not detected and the guidelines to fix it are not clear.At page 5/32 the UM2517 claims:Enter “C:\Program Files (x86)\STMicroelectronics\ST25R3916_Discovery_GUI\Driver�? and install it.But the \Dr...
Hello, I'm working on a product that needs sixteen antennas, so we're looking at using the ST25R391x series but have it be single ended, with each output going to a 1:8 antenna MUX. I have the multiplexer to test but first need to get single ended ...
Dear All,Now I know that the ic ST25R3917B support Apple ECP.Here are my new questions:1. Can i get some guide files of Apple ECP for developing terminal product based on ST25R3917B?2. Should I gat Apple's authorization before sending authorization r...
All, I would like to first begin with saying thank you for your time in attempting to assist me.Library used: NFC st25r3911b LibraryI am attempting to read and write from/to a tag; more specifically a Type-2 and Type-4. I have been looking through ex...
How we can write data into type A T4 NFC card using st25r3911 RFAL stack code.Currently I'm using ST25R3914 NFC Reader IC interfaced over SPI with renesas microcontroller.For NFC card pairing can I read and write data from NFC card?
Hello, The datasheet mentions how to use external load modification on the ST25R3916B but it doesn't clearly describe *when* to use it. Under which circumstances does it make sense to add the diodes and FET for external load modulation?Thanks,Derek