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CC2540 F128/F256 difference

Brian Cho
Intellectual 420 points
Other Parts Discussed in Thread: CC2540

Hi,

I have two same boards that have simple circuit like CC2540 datasheet P.24. Also I used same source code - simpleBLEPeripheral in BLE stack 1.4.0. The only difference is one is CC2540F128 and the other one is CC2540F256. I confirmed that F128 transmits bluetooth signal and F256 doesn't.

So I checked RF_P and RF_N using oscilloscope and saw F256 doesn't send any wave to antenna. Both hit the peripheral state notification callback and indicate it is advertising. It seems like everything is okay. I checked couple other chips and F128 works and F256 doesn't work always. What would make the difference? If there is anything I can try, please let me know. I'd really appreciate it.

Thanks,

Brian