NORA-B1 series - System integration manual
UBX-20027617 - R02
Design-in
Page 28 of 58
C1-Public
Figure 7: Size of the RF keep-out area for the NORA-B106 module
4.4
Supply interfaces
4.4.1
Module supply design
A good connection of the module’s
VDD
and/or
VDDH
pins with DC supply source is required for proper
module operation. The guidelines are summarized below:
•
The
VDD
and
VDDH
connections must be sufficient to support the maximum current of the
application.
•
The
VDD
and
VDDH
connections must be routed through a PCB area separated from sensitive
analog signals and sensitive functional units. It is a good practice to interpose at least one layer of
PCB ground between the
VDD
track and other signal routing.
There is no strict requirement for adding bypass capacitance to the supply net close to the module.
But depending on the layout of the supply net and other consumers on the same net, r capacitors
might still be beneficial. Though the
GND
pins are internally connected, connect all the available pins
to solid ground on the application board, as a good (low impedance) connection to an external ground
can minimize power loss and improve RF and thermal performance.
4.5
Debug interface
NORA-B1 modules support Serial Wire Debug (SWD) and Serial Wire Viewer. When designing a host
board with the NORA-B1, the SWD interface must be made available. The module does not contain
any software from the factory and to initially flash the module the SWD interface must be used.
During software development, a debug connector to the module is useful.
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