S32K312 temperature sensor inaccurate reading

[SunLucas]

Hello NXP Team,

I am working on the S32K312​ internal temperature sensor and need help with incorrect temperature readings.

I have reviewed similar threads and confirmed the basic configurations, but the ADC results do not reflect the ambient temperature.

What I have done so far：

(1) TEMPSENSE clock enabled​-Screenshot attached 

SunLucas_0-1784265425989.png

(2)ADC configuration

• ADC instance: ADC0

• Channel: Temperature Sensor (TEMPSENSE)

• Trigger mode: Software trigger

SunLucas_1-1784265855587.png

(3)Measurement routine

• Periodically start ADC conversion

• Wait for conversion complete flag

• Read ADC data register

SunLucas_3-1784266057594.png

(4)Result

However, the converted temperature value does not match the actual ambient temperature.

SunLucas_4-1784266156349.png

Any guidance, clarification, or reference code for the S32K312 temperature sensor would be greatly appreciated.

Thanks in advance for your support!

Best regards,

[Senlent]

Hi@SunLucas

Please check the "TempSense Voltage Supply" and tell me what your current hardware's VDD_HV_A supply voltage is.

[SunLucas]

The TempSense voltage supply is configured as 0x58, hardware's VDD_HV_A supply voltage is 5V

SunLucas_1-1784274126228.png

[Senlent]

Hi@SunLucas

You can send me your EB configuration file, and I'll check it for you.

There are two points to note: first, the reference voltage of the Temper Sensor must match the onboard VDD_HV_A; second, the sampling time. Once you've verified that these two points are correct, then there are no other points to note for this module.

[Senlent]

Hi@SunLucas

Then you should set TempSense voltage supply to: 5V * 16 = 0x50

[SunLucas]

I further switched the ADC voltage reference to 0x50, but the issue persists:

1. The temperature readings deviate significantly from the ambient temperature (28°C).

2. Temperature data retrieved via the API exhibits severe fluctuations, as shown in the attached plot.

SunLucas_2-1784276930276.png

SunLucas_1-1784276815975.png

[Senlent]

Hi@SunLucas

The temperature channel requires a relatively long sampling time, with a minimum of 1.2 microseconds.

Therefore, please check the sampling time settings.

[SunLucas]

changed the sampling time division ratio from 2 to 4, but the collected temperature data is still incorrect. Please help me troubleshoot the root cause. The detailed configuration is as follows:

SunLucas_0-1785819399965.png

SunLucas_1-1785819416950.png

SunLucas_2-1785819429465.png

SunLucas_3-1785819445393.png