dear all: i have received the error codes: 8E....(it is really a long data)from ST95HF,which means "reception lost without EOF received",i don not know why,are u guys have the same problem.and this error code occurs only when i use NFC function
ST25DV04 NFC I2C communication problem if ST25DV04 all time under Reader. There are cases (one per tens of minutes) that communication on I2C and RF is closed together and there is no way to reset if ST25DV04 to normal state. Recommended I2C long "start condition" not solve problem. How I can reset chip in this case.
My application will use NFC to either As a passive means of reading an identifier and to store or collect some simple information when a battery is discharged. In this case the I2C bus will be low. Also report that the battery condition. As a passive or powered means of doing the above plus pass information such as BlueTooth and Long range…(Show moreShow less)
I think the answer is that the I2C bus pins can be low when VCC of the NFC is low. It can't be any other way? Vout must not be held low eg because the power demanded by other things is too high or else the NFC can not operate in Passive mode. This means I will have to add a power switch of some kind?
Hi, is there a way to detect if a tag ISO14443A/B leave the field of CR95HF antenna? I need to detect the event "card removed" without change status of the card , therefore I can't send any messages to the card. Best regards, Ciro
Do you have CADSTAR 17 or lower footprint for either the 14x14mm square single sided or the double sided PCB version. I am working on a four layer design so a four layer coil or using any two or three layers design would be acceptable. It is for M24LRxx IC. DXF file format may also be acceptable?
Quadrasol who support CADSTAR in the UK have helped me with a PCB foil pattern that I can paste as a shape or wires. I can go with that but I was hoping to make a Library part with a symbol and footprint.
VPSTX is wired to 3.3Volts. I want to give it +5V to increase the power. This changes Rout from 27 ohms to 16 ohms. I tried using the CR95HF EMI FILTER CALULATION tool to work out component values, without success. As a baseline, I looked at the 3 volt case, since I already had the answer. I opened the tool and found most of the values default…(Show moreShow less)
Thank you for the reply. I had some minor success with it. For my "+5V at VPSTX" I increased RX1 and RX2 from 330 to 604, and (at the tool's recommendation) used 27pF for C11 and C12. I verified that the signal at pins RX1 and RX2 did not exceed 8V. The end result was performance roughly equal to the board's original performance. So, there…
This is a follow up question to my question elsewhere on obtaining a Coil footprint used in a reference design - IC to be used; M24LRxx but M24SRxx could be used. Which of the 14x14mm or 15x15mm square designs has the longest range in passive mode lowest data rate? There are two examples of one design that has the coil on one side and no…(Show moreShow less)