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S2-LP real output power at +10dBm

MNyff.4
Associate

Hello

I measured the output power with several S2-LP development kits with the S2-LP DK – Application v1.2.1. If I set the HPM maximum output power of +14dBm, I can measure the following output power:

KIT1 (STEVAL-FKI433V2): 12.9dBm

KIT2 (STEVAL-FKI433V2): 12.7dBm

KIT3 (STEVAL-FKI868V2): 14.2dBm

KIT4 (STEVAL-FKI868V2): 14.1dBm

The 433MHz versions are a bit weaker, but the output power is ok.

If a output power of +10dBm is set, I measure the following output power:

KIT1 (STEVAL-FKI433V2): 5.3dBm

KIT2 (STEVAL-FKI433V2): 5.9dBm

KIT3 (STEVAL-FKI868V2): 7.4dBm

KIT4 (STEVAL-FKI868V2): 7.6dBm

The output power is 3 to 5dB too weak. Why? Are the register values calculated incorrectly?

From the datasheet:

 0690X000008BT8iQAG.jpg

 The application uses a 0.5dB output power step for the complete range. Is this wrong?

Below the table is a note to the PA_CONFIG0 (0x64) register. Which values should be used for PA_DEGEN_TRIM for different output powers?

Kind regards,

Martin

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