CCS/CC2640R2F: Improve BLE antenna performance

Giuseppe_pe

Expert 1930 points

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640

Tool/software: Code Composer Studio

Hi,

on my custom board I use the antenna in the document attached.

antenna_cc2640_design_1.pdf

In the code I use:

HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_5_DBM );
HCI_EXT_SetRxGainCmd(HCI_EXT_RX_GAIN_HIGH);

and I obtain good performance in the advertising power, but I have some problem in the connection with smartphone.

Is there some function that I can use to improve the connection performance?

Thanks.

Best regards.

Giuseppe

over 5 years ago

0 TER over 5 years ago

TI__Guru**** 317180 points

It's not clear if you suspect a hardware issue or not.

Before trying to connect with the phone, have you tried to look into this: to be able to establish is what you are seeing is a HW or SW issue.

If a SW issue,

please state the SDK version and the example you are using.

0 Giuseppe_pe over 5 years ago in reply to TER

Expert 1930 points

Hi,

I start from multi_role_cc2640r2lp_app, and I use 2.30.00.28 SDK,

Thanks.

Best regards.

Giuseppe

0 TER over 5 years ago in reply to Giuseppe_pe

TI__Guru**** 317180 points

Meaning you know it's a SW issue?

0 Giuseppe_pe over 5 years ago in reply to TER

Expert 1930 points

Hi,

I suppose,

i see the advertising from an acceptable distance (4-5 meters), but when i try to connect to it, I have to be 1-2 meters at most. So, I think that the problem is in the RX sensitivity.

0 Giuseppe_pe over 5 years ago in reply to TER

Expert 1930 points

I use the CC2640 in differential operation with internal bias, if I use it with external bias is it possible to improve performance significantly?

0 TER over 5 years ago in reply to Giuseppe_pe

TI__Guru**** 317180 points

Around 1 dB improvement.

If you believe this is a hardware issue, look into the app note I linked to.

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CCS/CC2640R2F: Improve BLE antenna performance