How to Design to Accept Any of the A2530 or A2541 Modules in One Layout

The AIR A2530x24x and A2541x24x modules are mechanically identical (i.e. same size and pad locations). And the two module families are to a certain extent pin-for-pin compatible (i.e. same electrical uses for the pins). But there are some pins that require special consideration when trying to create a "one-layout-fits-all" design. This one-layout-fits-all design will make some features of the individual chips unavailable. But it may be acceptable.

These are the factors regarding creating a single layout to take all four module types: A2530R24x, A2530E24x, A2541R24x, A2541E24x.


 * 1) There are three signals (EN, PA_EN and HGM) used for the A25xxE modules to connect the CC25xx to the CC259x Range Extender.  To create one layout to accept all four types, they should be left unconnected externally.
 * 2) There is a DC-DC converter inside the A2541R modules.
 * 3) There is a 32KHz crystal inside the A2541E modules.

As a result, the following table describes the special actions required to done the one-layout-fits-all design.

Special Pins
The following module pins need special consideration to accommodate all four variations of the A2530 and A2541 modules.

Special Pin
Pin 20 is used as either P1_2, or as CFG0, or as PA_EN depending on the software used in the module and on the module itself.

As such, it needs three states that can be controlled by a jumper: