Thanks in advance, I need some help!
First, I've read the programming and antenna/PCB layout guides completely. Several times. There just isn't a whole lot of detail about the layout/design for a loop antenna. I have a 24AWG wire wire loop attached to TX and TXGND. Can anyone confirm that the antenna is supposed to connect back to ground? It is about 22cm long and I will have it placed in a rectangular shape about 1in x 3.5in. It is naturally going to be perpendicular to the plane of my PCB board. Also, it seems that the inductance ~200nH is in the range tunable with the internal variactor/hardware. So, do I not add ANY external inductor/capacitor?
While I'm at it - I can't get the chip to communicate correctly via I2C. I am convinced the chip is mounted well - which is my biggest concern - but just by visual inspection. Without correct I2C coms I can only verify that the GPOI1 pulls to a high voltage while the 4713 is in reset, by way of confirming pins are connected well to PCB.
However, when I try to interface, my MCU hangs after sending NACK ending the status read. The data byte is "0b00000001" but I think the 4713 isn't releasing the I2C clock. So I can't even read successive times for a valid CTS bit. Is this a symptom anyone has had before?
One last question, I mount the chip using a low-temp solder paste and ~150°C. Is there any way that's too hot - and I've damaged the chip somehow?
Thanks again- Rick.
Moved to the relevant forum at https://www.silabs.com/community/audio-radio/forum.topic.html/si4713_antenna_andi2cissues-97oU