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CC2543: Frequency spread tolerance

Part Number: CC2543

I have some Communication problem with two CC2543 devices communicating with each other.

Aproximately 20% of all button communications are not correctly received.

How off can we be and still have a reliable communication between two CC2543 devices running in 2MBps, 320kHz deviation with a 7byte payload? It runs in auto mode with 10 re-transmissions in case the com fails. And still ~20% of the coms is not received.
We have measured with a spectrum analyser the baseband frequency on both sides. This is the result:

Transmitter - 2420,06MHz

Receiver - 2420,25MHz


I found this in the datasheet. Is that what we can expect for our product aswell? 300kHz tolerance?


  • Hi Grusmacka,

    The device will tolerate up to +/- 300 kHz offset as listed in the datasheet. This seems to be ok in your setup. That being said, an offset of 250 kHz as you have on the receiver is a lot. Are you sure the 32 MHz crystal is tuned correctly?

    Have you tried running our PER Test on your devices? www.ti.com/.../swrc251 Or SmartRF Studio?

    Regards,
    Fredrik