Finding a matching part to X1 footprint

[sivi]

Hello, in the BOM of dev kit and thingy you use a component name BT- XTAL 2016. In your design this component has a footprint of 4 pads 

Yet in the BOM the selected matching part is: FC-135 32.7680KA-AC. This component has only 2 pads and do not match the BT- XTAL 2016 footprint. 

Can you help me resolve the issue? 

[Simonr]

Hi

Due to the Easter holiday you will have to expect a delay in replies, sorry for the inconvenience!

It seems you are mixing up the crystals here. BT-XTAL 2016 is a 32MHz external crystal with 4 pads which is required in our designs. The 32.7680KA-AC is an external optional 32.768 kHz crystal, with only 2 pads. The BT-XTAL 2016 has 4 pads, where two of them should be connected to ground, which is why it only appears as having 2 pads in our schematics.

Best regards and happy Easter,

Simon

[sivi]

I think the 32 MHz is optional and the 32.768 kHz is imperative am I wrong? 

[Simonr]

Yes, you're wrong. The 32MHz crystal is required, and the 32.768kHz is optional. Please refer to our reference design schematics for confirmation, which can be downloaded here.

Best regards,

Simon

[sivi]

Do you know/ Can you please check if the Fanstel's BT832 SoC already has a 32 MHz crystal integrated into it?  I don't find they refer to it in the specs more than in a drawing. Need to verify that my circuit has the required crystal

Cheers

[Simonr]

Hi

From the BT832 data sheet: "The following is a block diagram of BT832. Antenna circuit and main clock are integrated."

Yes, the 32MHz clock is integrated in the BT832 module.

Best regards,

Simon