About LltWc

LltWc · 2025-02-12

We've had issue with reading NTAG215 cards with some devices, presumably due to the large spread-out antenna, so I'm working on a better understanding of the power output so that we can properly calibrate devices out of manufacturing.Currently, I do ...

LltWc · 2025-01-24

I've been implementing Wake Up mode with inductive wakeup on the ST25R3916 with custom firmware. It's all functioning as expected, except for the oscillator interrupt.As seen in the logs below, when I switch to Wake Up mode, I mask every IRQ except I...

LltWc · 2025-01-16

Where can I find details on inductive sensor wakeup for the ST25R3916? It's only even mentioned on pages 1 and 11 of the datasheet. My understanding is that inductive wake-up will detect tags only, whereas capacitive will detect other objects like a ...

LltWc · 2025-01-16

I'm adding Power-Down mode to my Listen Mode implementation, and have come across some unexpected behavior.I keep the chip in Power-Down, with the field detector set to automatic, and then see EON when a field is detected, as expected. The first time...

LltWc · 2024-12-18

I've been seeing some unexpected failure modes while reading T2Ts with an ST25R3916. Every ~300ms, the device sends a wake request, and if a tag is detected, goes ahead with the reading process. If a tag is detected and an error occurs anywhere in th...

LltWc · 2025-02-13

Thanks—that answers my question, I'm now setting the RFO resistance to 2x so that the typical measured RFI voltage is ~2.6 V.The actual solution to the problem, though, ended up being in hardware. A pin was left unsoldered (floating) in the antenna c...

LltWc · 2025-01-27

Yes, thank you, I'm aware that the bit will still be set. The IRQ readout in the log I posted only occurs when the IRQ line is set high, every 100ms, and you can see that the only bit set is the I_OSC bit. I don't see any way to interpret the behavio...

LltWc · 2025-01-27

Hi Brian, yes, I am aware that the oscillator is enabled in order to take inductive measurements. Why is the interrupt still being raised when I have the mask set?

LltWc · 2025-01-17

Got it. For others' reference, both phase and amplitude wakeup are inductive wakeup.

LltWc · 2025-01-16

Yet another one I solved right after posting!For anyone who comes across the same problem - the issue was that for some reason on the second EON, the OSC interrupt came earlier than the first time, which resulted in it being caught in the main interr...

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ST25R3916 Max Allowed Voltage Level on RFI

I_OSC raised unexpectedly during Wake Up mode

ST25R3916 Inductive Wake-Up

Oscillator interrupt is not raised after Ready -> Power Down -> Ready

Mitigating hard framing and CRC errors in Reader/Writer mode

Re: ST25R3916 Max Allowed Voltage Level on RFI

Re: I_OSC raised unexpectedly during Wake Up mode

Re: I_OSC raised unexpectedly during Wake Up mode

Re: ST25R3916 Inductive Wake-Up

Re: Oscillator interrupt is not raised after Ready -> Power Down -> Ready