Set the RF to a fixed transmission frequency

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Set the RF to a fixed transmission frequency

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guwenlong_l
Contributor I

Is there any software to set the fixed frequency of RF transmission on NXP website?

Or a test software that sets a fixed RF transmission frequency.

I'm currently developing a project for TPMS, The chip used is FXTH87E.

Now we are testing the RF sending data, I'm going to set the RF fixed frequency to 433.92MHz.

f1ef8691077ba8de1a28fb71f80d432.png

I used the TPMS 87E WheelLoc sample project. Above is some code from the function RF init().

I've done this multiple times, The center frequency signal captured during the test could not be accurate to 433.92MHz.

Do I need to set other parameters for RF transmission frequency?

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TomasVaverka
NXP TechSupport
NXP TechSupport

Hi,

Please refer to the attached presentation which explains how to configure the frequency(ies) of the modulated signal.

The precision of the RF XTAL has a direct impact on the output frequencies: if the XTAL deviates from 26 MHz, then the output frequencies will deviate from their expected values.

We recommend the use of the RF XTAL NX3225SA from NDK for an optimal precision.

Best regards,

Tomas

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