About the sliding factors of the LPO frequency

[Hozumi]

The S32K1xx LPO frequency has the following specifications:
Min. 113kHz, Typ. 128kHz, Max 139 kHz

What is the LPO frequency sliding factor?
temperature? Or is it a manufacturing issue?
Can NXP provide the probability of working with Typical?

[danielmartynek · Accepted solution]

Hello @Hozumi,

It depends on the temperature and it differs part-to-part from the manufacturing too.

The LPO is trimmed as close to 128KHz as possible in the production.

For example, LPOTRIM can be pre-programmed to 0x1D in the production.

One LPOTRIM step gives about 3kHz difference in the LPO frequency.

Measured default frequency 129kHz (CLKOUT).

Trimmed to 0x1C (one step up) = 132kHz

Trimmed to 0x1E (one step down) = 126kHz

That means that just from the production, the LPO can be 128KHz +- 1.5kHz.

Regards,

Daniel

[Hozumi]

Thank you for your prompt reply.

Just to make sure, is the trimming done by the NXP side before shipping?

And one more question, Is it possible for the LPO frequency to fluctuate during operation?

[danielmartynek]

Hello @Hozumi,

Yes, it is trimmed by NXP.

The frequency depends on the operational conditions like temperature, but the dependency is not specified.

BR, Daniel