WT11i-E-AI4 Bluegiga Technologies, WT11i-E-AI4 Datasheet - Page 14

• Manufacturer Part Number: WT11i-E-AI4
• Description: Bluetooth / 802.15.1 Modules WT11i Class1 2.1+EDR uFL Conn iWRAP 4
• Manufacturer: Bluegiga Technologies

Specifications of WT11i-E-AI4

• Rohs: yes
• Class: 1
• Sensitivity: - 83 dBm
• Operating Supply Voltage: 3.3 V
• Interface Type: UART, USB
• Antenna Connector Type: Chip
• Maximum Operating Temperature: + 85 C
• Dimensions: 35.75 mm x 14.5 mm x 2.6 mm
• Mounting Style: SMD/SMT

– Place LC filtering and DC coupling capacitors symmetrically as close to
– Place MIC biasing resistors symmetrically as close to microhone as pos
– Make sure that the bias trace does not cross separated GND regions (D
– Keep the trace as short as possible
5 Layout Guidelines
Use good layout practices to avoid excessive noise coupling to supply voltage traces or sensitive analog
signal traces, such as analog audio signals. If using overlapping ground planes use stitching vias separated
by max 3 mm to avoid emission from the edges of the PCB. Connect all the GND pins directly to a solid GND
plane and make sure that there is a low impedance path for the return current following the signal and supply
traces all the way from start to the end.
A good practice is to dedicate one of the inner layers to a solid GND plane and one of the inner layers to
supply voltage planes and traces and route all the signals on top and bottom layers of the PCB. This
arrangement will make sure that any return current follows the forward current as close as possible and any
loops are minimized.
pins as possible
AGND) so that the path for the return current is cut. If this is not possibl
not separate GND regions but keep one solid GND plane.
Recommended PCB layer configuration
Figure 6: Use of stitching vias to avoid emissions from the edges of the PCB
Overlapping GND layers without
GND stitching vias
Figure 5: Typical 4-layer PCB construction
Bluegiga Technologies Oy
Overlapping GND layers with
GND stitching vias shielding the
RF energy
Signals
GND
Power
Signals
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