Cannot Extend range of CC2540 by using CC2590

Alex Tong

Other Parts Discussed in Thread: CC2540, CC2590, CC2541, CC2591

Hi,

I cannot extend the range of CC2540 by using CC2590. The result for adding CC2590 is the same as the normal PCB antenna I am using (keyfob antenna).

The project I am using to test is "SimpleBLEPeripheral" in BLEstack1.4 and I am using the iPhone TI Multitool apps to test the RSSI. I have been following the setting in Table8.2 in the document AN120. I have also tried the following code in "SimpleBLEPeripheral_Init()":

HCI_EXT_ExtendRfRangeCmd();

HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_0_DBM);

HCI_EXT_SetRxGainCmd(HCI_EXT_RX_GAIN_HIGH);

I could read the pins P1_2 and P1_3 in the Oscilloscope that there were 3 pulses(each 200~500us) producing in a period of 27ms.

However, it seemed not to be worked for me. I have even made a PCB using the layout of the CC2590EMK and use CC2541 to test. It still did not work. I could see that CC2590 is running as the RSSI drop a lot when I cut its power.

Have I missed something?Or anythings wrong?

For the PCB and the components, I am using bigger tolerances. Is this the reason?

Would you please give me some suggestions? Thanks.

Regards,

Alex

over 11 years ago

0 Fredrik K over 11 years ago

TI__Guru** 106705 points

Hi Alex,

Could you share your schematic and layout files?

Regards,
Fredrik

0 Alex Tong over 11 years ago in reply to Fredrik K

Prodigy 40 points

Hi Fredrik,

Thanks for your reply.

I referred to the below cc2541-2590 reference design
https://dl.dropboxusercontent.com/u/20717872/CC2541_CC2590_EM_Schematic.pdf

And also please find the below Gerber file.
https://dl.dropboxusercontent.com/u/20717872/BLE4.0%20tas-1.rar

Regards,

Alex

BLE4.0 tas-1.rar

0 Fredrik K over 11 years ago in reply to Alex Tong

TI__Guru** 106705 points

Hi Alex,

You must follow the layout of the reference design as closely as possible. There are numerous problems with your layout, including long and asymmetrical RF traces between CC2540 and CC2590, placement of decoupling capacitors, signals underneath the RF traces, antenna placement with respect to the surrounding ground plane, etc.

Regards,

Fredrik

0 Alex Tong over 11 years ago in reply to Fredrik K

Prodigy 40 points

Hi Fredrik,

Thanks.

But I am wondering why there were not any enhancement as I have also used the layout of 2590EMK TI reference design below.

https://dl.dropboxusercontent.com/u/20717872/swrc109.zip

I connected the RF_P and RF_N to the radio pin. However, it was not enhanced.

Regards,

Alex

0 Fredrik K over 11 years ago in reply to Alex Tong

TI__Guru** 106705 points

I am not sure I understand. Did you connect a CC2590EM board to your own CC2540 board? How did you do the connections? With wires?

0 Alex Tong over 11 years ago in reply to Fredrik K

Prodigy 40 points

Yes. with wires

0 Chunyang Zhang over 11 years ago in reply to Fredrik K

Prodigy 50 points

Hi Fredrik:

Recently, in my project, I also want to extend the range of CC2540 by using CC2590 or CC2591. May I ask some questions to you? Thanks a lot.

1. In the BLE4.0 Stack, according to swra422.pdf, I can find HCI_EXT_ExtendRfRangeCmd() in hci.h, but I can not find hci.c, so where can I find definition of HCI_EXT_ExtendRfRangeCmd()??

2. Due to special application, we can not connect P1_1 to HGM, P1_2 to PA_EN, P1_3 to EN, we want to connect to P1_1 to PA_EN, P1_4 to EN, P0_7 to HGM, but how and where can I modify the code??

thanks you a lot

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Cannot Extend range of CC2540 by using CC2590