I am trying to configure an AS3933 wake up chip to work at 25 kHz using Manchester code. I configure the chip using a microcontroller and SPI, and generate the clock reference from the microcontroller as well. I am able to get it working at 125 kHz with a very low input peak-to-peak voltage signal (about 5 mV p2p). I am feeding the signal directly from the signal generator into the antenna input with a wired connection, I only use 1 channel. However, when I change frequency to 25 kHz the chip doesn’t wake up unless I increase the input voltage of about 100 times. I don’t know why this happens, based on the datasheet the sensitivity should improve with decreased carrier frequency and yet…

Any help would be greatly appreciated.
Thank you

I have forwarded your request to the Product Specialist. I will update as soon as I receive a reply.

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