S32K中的主题 S32K ADC transfer function

S32K ADC transfer function

muellermathias — Wed, 15 Jun 2022 08:06:07 GMT

In the application note AN12217 two different ADC transfer functions are presented:https://www.nxp.com/docs/en/application-note/AN12217.pdf

Unfortunately I could not find any information _which_ is actually implemented in the S32k controllers (in our case S32K144).

Are you able to provide this information?

Thank you in advance!

Re: S32K ADC transfer function

Robin_Shen — Thu, 16 Jun 2022 01:02:04 GMT

Hi muellermathias,

Sorry. We did not offer ADC Actual Transfer Function.(You can not find the curve describing this behavior is the actual transfer function and includes all the errors inherent to the ADC module itself.)

The following ADC specifications can be known from S32K1xx MCU Family - Data Sheet:
Differential Non-Linearity (DNL)
Integral Non-Linearity(INL)
Total Unadjusted Error (TUE)

Best Regards,
Robin
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Re: S32K ADC transfer function

muellermathias — Thu, 23 Jun 2022 07:44:34 GMT

Hello Robin,

I realize that the ideal transfer function cannot be represented by the actual hardware, but surely there must have been a design goal which type of transfer function should be implemented (compensated or uncompensated)?

But maybe I still have an understanding problem there...

Regards,

Mathias

Re: S32K ADC transfer function

Robin_Shen — Mon, 04 Jul 2022 09:31:45 GMT

Hi Mathias,

I'm not sure if I understand what you need, can you show me an example. For the case of 12-bit ADC reference voltage of 5V, does ideal transfer function mean: result=4096*Vin/5 ?

Best Regards,
Robin

Re: S32K ADC transfer function

muellermathias — Tue, 05 Jul 2022 09:50:47 GMT

First of all sorry for the late reply (project priorities currently have changed).

I'll try to give an example:

Would I read (in an ideal world) a 1 from the result register if the analog input's voltage reaches

0.5 LBS

or only if it reaches

1 LSB?

Re: S32K ADC transfer function

Robin_Shen — Wed, 06 Jul 2022 02:22:12 GMT

AN5250 How to Increase the Analog-to-Digital Converter Accuracy in an Application