Kinetis Microcontrollers中的主题 Re: Transmitter output power configuration in KW36

Transmitter output power configuration in KW36

nsuresh2 — Mon, 18 Nov 2019 11:04:45 GMT

Hi XingChang,

As per the KW36 datasheet attached, the transmitter output power can be configured from -30 dBm to +3.5 dBm.

Please let us know the parameter needs to be set to configure the transmitter output power.

Thanks,

Regards,

Naven Suresh

Re: Transmitter output power configuration in KW36

xing_chang — Tue, 19 Nov 2019 01:55:21 GMT

Hi nsuresh2@visteon.com‌,

Add the following 2 MACROs in the file preinclude.h. The relationship between the set value and the transmit power can be calculated by the following table.

#define mAdvertisingDefaultTxPower_c 20

#define mConnectionDefaultTxPower_c 20

0x0028 = 40, so if the setting value is 20, the Tx power is 0.3dBm at 25 ℃.

Re: Transmitter output power configuration in KW36

nsuresh2 — Tue, 19 Nov 2019 07:00:59 GMT

Hi XingChang‌,

Thanks for your quick response.

So as mentioned above both the macros are enabled and set to the default value of 20

When we measure the power it shows -2.39 dBm at room temperature, but as per the above table it should be 0.3 dBm

What could be the reason for this? Any other parameters that need to be looked into this for power deviation?

Thanks!

Regards,

Naven Suresh

Re: Transmitter output power configuration in KW36

xing_chang — Tue, 19 Nov 2019 07:46:48 GMT

Hi nsuresh2@visteon.com‌，

The transmit power we measured at the PIN of the chip, if you measure from the SMA, your measurement is reduced by the RF line loss. This is usually around 1dBm, but your loss is a bit big. Please check if the matching network is suitable.