Telink FR1 PCB Design Guideline
AN-22051900-E1 Ver. 1.0.0
8
2.2
Doulbe-layer board
2.2.1
Component and copper wire layer + carbon film routing layer
One layer of this double-layer board is used to place components and route copper wire, and the other layer
is for carbon film routing. For example, in a remote control design, we place the components on one layer
and the keys on the other layer. The keys need to be designed as carbon film keys and the keys routing is
connected to the component layer via carbon film via holes. Note that carbon film vias are chosen for cost
concerns.
The remote control board shown below can be designed as this type of double-layer board.
Figure 2-2 Component layer + carbon film layer
