nrf52810 schematic and layout verification

[hardikvala]

Hello,

We are considering bluetooth module of laird tech for our ongoing project, it has Nrf52810 chip.

Please verify the below things

Schematic:

1) this module has onboard crystal but we also use an external crystal of 32.768 Khz for better efficiency.
2) we are generating 3.3v form battery and supplying to the bluetooth module. Capacitor on the supply pin is 0.1uF (10v), please confirm.
3) We have connected this module with the controller using UART_TX & UART_RX, any external capacitor or any other component is required or not.

Layout:

1) Currently we keep maximum (6x28)mm route keepout all from the antenna, if any changes please correct me.
Please suggest any specific guideline to be followed for this bluetooth module.

2) is length matching is required in UART_TX & UART_RX trace?

Here i’m sharing schematic and layout pdf, so please verify and let me know if any correction is required.

BLUETOOTH.pdfBLUETOOTH KEEPOUT.pdf

[ketiljo]

1) this module has onboard crystal but we also use an external crystal of 32.768 Khz for better efficiency.

 Not sure if it has a onboard 32 kHz crystal, check the datasheet of the module. Most probably not since the XL1 and XL2 pins are available. Check the CL value of the crystal and select caps as follows:

Ccap = 2 * CL - 4pF

For example, if CL = 10 pF, you need 16 pF caps, round down to 15 pF.

 

2) we are generating 3.3v form battery and supplying to the bluetooth module. Capacitor on the supply pin is 0.1uF (10v), please confirm.

 100 nF sounds small. There might be an onboard capacitor as well, check the datasheet again. If not, you need much larger cap, > 1 µF

 

3) We have connected this module with the controller using UART_TX & UART_RX, any external capacitor or any other component is required or not.

 Normally not

 

1) Currently we keep maximum (6x28)mm route keepout all from the antenna, if any changes please correct me.

 Looks ok. But there might be special requirement in the modules datasheet

 

2) is length matching is required in UART_TX & UART_RX trace?

 No