RE: nrf52810 schematic and layout verification

ketiljo — Mon, 10 Dec 2018 12:27:18 GMT

[quote user=""]1) this module has onboard crystal but we also use an external crystal of 32.768 Khz for better efficiency.[/quote]

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.

[quote user=""]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.[/quote]

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

[quote user=""]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.[/quote]

Normally not

[quote user=""]1) Currently we keep maximum (6x28)mm route keepout all from the antenna, if any changes please correct me.[/quote]

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

[quote user=""]2) is length matching is required in UART_TX & UART_RX trace?[/quote]