My customer is trying to use the KW40Z in their ZigBee products.
And they need to add external power amplifier and LNA to extend the RF Range for the product. However, they have encountered a problem on this part.
They use single antenna configuration and use only one GPIO PTC2 to control the TX/RX switch of the FEM (Front End Module).
Refer to the chapter 31 (FEM) and chapter 51 (ZLL) of the reference manual (Document Number: MKW40Z160RM Rev. 1.2, 10/2015):
Setting1 (Use TSM)
Setting 2 (Use FAD)
Output GPIO (MUX=1)
MUX = 4
Have tried the following values with the above FAD Control Register value:
Base on the above settings, the PTC2 always stays low even when the KW40Z transmitting and receiving data.
Also the gpio pin mapping shown in page 1036 and page 1408 of the reference manual are not consistent.
Can anyone advise the correct setting to enable the TX/RX Switch pin (PTC2) for 802.15.4.
Thank you very much!