No Bluetooth Signal on Dev Board.

RE: No Bluetooth Signal on Dev Board.

ketiljo — Tue, 15 Jan 2019 12:55:13 GMT

Even with a bad layout, you should be able to get connection albeit with short range. The crystal you're using has a load capacitance of 6 pF. This means that the load caps, C10 and C14, should be 8.2 pF each. Try changing these first.

The formula is Ccap = CL * 2 - Cpin, where Cpin = 4 pF.

RE: No Bluetooth Signal on Dev Board.

sezai — Mon, 14 Jan 2019 23:01:13 GMT

xrcmd32m000fxp54r0 - Murata

RE: No Bluetooth Signal on Dev Board.

AmbystomaLabs — Mon, 14 Jan 2019 14:14:06 GMT

Sezai, I reviewed your design documents. There are so many layout issues with your board, it is not worth trying to debug. The ground plane is wrong, the stitching vias are missing, caps are in the wrong place or too far from the chip to do any good, the ground plane is broken, etc., etc.

You need to respin this board and follow the design guidelines for the nRF52832 in the reference design. You can also submit your design to the Nordic team prior to having it made.

RE: No Bluetooth Signal on Dev Board.

ketiljo — Mon, 14 Jan 2019 08:20:00 GMT

What is the part number of the 32 MHz crystal you're using?

RE: No Bluetooth Signal on Dev Board.

sezai — Sun, 13 Jan 2019 23:37:10 GMT

Hello,

thank for your answer. Here is my data..

devzone.nordicsemi.com/.../Thingy52_5F00_OutputFiles.zip devzone.nordicsemi.com/.../pca20020_5F00_sheet2_5F00_mcu.SchDoc

devzone.nordicsemi.com/.../NordicMeshV01.PcbDoc

RE: No Bluetooth Signal on Dev Board.

AmbystomaLabs — Sun, 13 Jan 2019 19:51:48 GMT

Your issues look like 100% layout problems. For starters the footprint for the epad is considerably too small. You should refer to the reference design for guidance on this.

If you want a more thorough review and explanation, please also post the ground plane layer.