About APant.2

APant.2 · 2022-10-12

All,BackgroundChip: ST25R3914Library: RFAL for ST253911BI am currently working on a project that uses the ST25R3914 nfc chip and would like to implement the Automatic Antenna Tuning (AAT) feature. After looking at the data sheet, it states that chip ...

APant.2 · 2022-10-04

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...

APant.2 · 2022-09-22

Hello,I want to apologize in advance for how long this post is. I wanted to provide as much information as I could so I can help you (the reader) get a better picture of what might be going on. Sorry.I am currently working on a project that uses a st...

APant.2 · 2022-10-25

Ulysses,I assume the equation, deg = 30 + [ ( (255 - x) / 255 ) * 120 ], is used to determine what value to write to the target register? Where if you want a 70 deg phase shift, you solve for x. The value you get for x is then written to the register...

APant.2 · 2022-10-24

I went through all 16 trim values as you recommended and it appears that no combination of tre bits gets the phase to exactly 90 deg. As mentioned before, the default 90 deg target was used.I have attached an excel document showing the results I obta...

APant.2 · 2022-10-24

Ulysses,I did not change the antenna target register, it was left at its default ( 90 deg ).I will discuss the potential hardware issues with the engineer and also record the data you suggest.We've already had the discussion on what we want to achiev...

APant.2 · 2022-10-21

It appears that when I add the algorithm, it causes the calibration to mess up. The values I got from the registers are:Phase - 129 or 89.3 degAmplitude - 255Calibration display - 248 (0b1111_1000)I then reset the system and checked the values right ...

APant.2 · 2022-10-21

Ulysses,I measured the phase and amplitude, along with the calibration display register, right after initialization (since the system automatically performs a calibrate call) and this is what I got:Phase - 130 or 88.8 deg.Amplitude - 255Calibration d...

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Automatic Antenna Tuning - ST25R3914

ST25R3914 Read/Write to Tag

ST25R3914 Library Issue

Re: Automatic Antenna Tuning - ST25R3914

Re: Automatic Antenna Tuning - ST25R3914

Re: Automatic Antenna Tuning - ST25R3914

Re: Automatic Antenna Tuning - ST25R3914

Re: Automatic Antenna Tuning - ST25R3914