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PSoC™ 4

diba_1468026
New Contributor

Hello,

Can anyone explain why  if we place a PSoC 4 BLE (CYBLE-224110-00), without respecting dimensions of the host PCB-keep out area, can lead us to an unacceptable BLE connection distance (RF-BLE connected at maximum 5cm RF from Tx)?

Based on Cypress datasheet "002-11264_CYBLE-224110-00_EZ-BLE_TM_CREATOR_XT_XR_MODULE.pdf" we have

pastedImage_0.png

Based on our board design we placed the antenna part of PSoC at the edge of host- PCB

pastedImage_1.png

What is the purpose of host PCB-keep out area concerning BLE RF propagation?

Keep in mind that we have an efficient VDD and VDDA in PSoC and also TX Power ,TXP, 0dBm!

Can this issue (the violation of respecting dimensions of the host PCB-keep out area for best RF perfomance) justify this unacceptable BLE RF connection or could be something wrong with other thing (bug)?

Thank you in advance

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1 Solution
GyanC_36
Employee

Hello,

        It is mandatory to configure/Enable the PA/LNA to reach the signal to antenna. For saving the power you can configure CSD/CPS pins further as mentioned in datasheet.

The range you are getting is just because of leakage current in Antenna pin.

-Gyan

View solution in original post

4 Replies
GyanC_36
Employee

Have you enabled the PA/LNA for this Module as described at page#16 of the Module datasheet ?

-Gyan

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diba_1468026
New Contributor

Hello Gyan,

Our application  in "CYBLE-224110-EVAL EZ-BLE™ PSoC XT/XR Evaluation Board", works fine (considering the BLE Tx Power, BLE has range > 5meters) . The same application(with the corresponding pinouts modifications) in our board, make Bluetooth Link with less range (<2cm) , Tx pwr 0dBm.

Our conserning is to use BLE with lower power consuption as possible without using Extended Range Feature . Is it nessesary to programing PA/LNA to be in Bypass mode (which

ensures that the RF signal reaches the antenna as reported in PAGE16 )? Or it is the default configuration of CSD - PA/LNA to be in Bypass mode?

We are trying to figure out, what it going wrong, we believe that it is only the Host PVB Keep-Out Area Around the chip Antenna that cause the limited bluetooth range.

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GyanC_36
Employee

Hello,

        It is mandatory to configure/Enable the PA/LNA to reach the signal to antenna. For saving the power you can configure CSD/CPS pins further as mentioned in datasheet.

The range you are getting is just because of leakage current in Antenna pin.

-Gyan

View solution in original post

diba_1468026
New Contributor

Hello Gyan,

We appreciate your guidelines in BLE configuration. Actually with LNA/PA standby mode and TxPower -6dBm we have 1m service area.

Again thank you very much.

Dimitris Babladimos

CEO

Beat4key

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