CC400

SWRS050

Page 22 of 32

28.

PCB Layout Recommendations

A two layer PCB is highly recommended.

The bottom layer of the PCB should be the

“ground-layer”.

The top layer should be used for signal

routing, and the open areas should be

filled with metallization connected to

ground using several vias.

The ground pins should be connected to

ground as close as possible to the

package pin. The decoupling capacitors

should also be placed as close as possible

to the supply pins and connected to the

ground plane by separate vias.

The external components should be as

small as possible and surface mount

devices should be used.

Precaution should be used when placing

the microcontroller in order to avoid

interference with the RF circuitry.

In most applications the ground plane can

be one common plane, but in certain

applications where the ground plane for

the digital circuitry is expected to be noisy,

the ground plane may be split in an

analogue and a digital part. All AGND pins

and AVDD decoupling capacitors should

be connected to the analogue ground

plane. All DGND pins and DVDD

decoupling capacitors should be

connected to the digital ground. The

connection between the two ground

planes should be implemented as a star

connection with the power supply ground.

The

CC400DB reference design is available

from Chipcon’s web site, and should be

used as a guideline for PCB layout.

29.

Configuration registers

The configuration of

CC400 is done by programming the 8 13-bit configuration registers. The

configuration data based on selected system parameters are most easily found by using the

SmartRF Studio software. A complete description of the registers is given in the following

tables.

REGISTER OVERVIEW

Address

Register Name Description

000

A

Main control register

001

B

General control register

010

C

General control register

011

D

General control register

100

E

General control register

101

F

General control register

110

G

General control register

111

H

General control register