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 

(2)ADC configuration

• ADC instance: ADC0

• Channel: Temperature Sensor (TEMPSENSE)

• Trigger mode: Software trigger

(3)Measurement routine

• Periodically start ADC conversion

• Wait for conversion complete flag

• Read ADC data register

(4)Result

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

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

[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.

[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: