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AN4630 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN4630
Description  PCB design guidelines for the BlueNRG and BlueNRG-MS devices
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4630 Datasheet(HTML) 27 Page - STMicroelectronics

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AN4630
Design recommendations when using
WLCSP34 package
Figure 22: Focus on BlueNRG biasing pins
On TOP layer avoid putting metal inside the red zone. This zone is very sensible to the
ground layer and the presence of a metal plane can affect the operation of the device.
The VBAT1 connection is improved using two laser filled vias.
Figure 23: Other TOP layer constraints
The RF ground in the TOP layer is “hot” so it could generate pulling power. To avoid this
risk, it is necessary to not merge the RF ground to the others ground on the TOP and
INNER2 layers, but merge all the different grounds in the INNER3 layer.
DocID027262 Rev 1
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