Association between 13 RMOX raw values and heating temperature

Hello David,

Thanks for your request, I assume you are referring to the heater temperature that is measured on each stage of an active measurement depending the RMOX value measured on each stage? As shown in the programming manual:

Is that right? Could you please confirm. Also please specify to us which operating mode are you using  and which library?

Thank you.

Best Regards,

IK_Renesas 

Hello David,

Thanks for your request, I assume you are referring to the heater temperature that is measured on each stage of an active measurement depending the RMOX value measured on each stage? As shown in the programming manual:

Is that right? Could you please confirm. Also please specify to us which operating mode are you using  and which library?

Thank you.

Best Regards,

IK_Renesas 

Hello,

Yes, you are right. I am referring to the heater temperature measured on each stage. Thank you for the information of programming manual that you shared. The plot on the bottom right is very useful; however, in addition, I would need the information on temperature in degrees associated to each stage.

In another topic I read that the rmox[6] has been associated to MOX_400C (see link below)

https://en-support.renesas.com/knowledgeBase/20684484

Now, I can suppose that rmox[0] is obtained at 100°C and there are increments of 50° C until rmox[6] is reached. The same reasoning also applies to the descending part of the curve. Is it correct?

I am starting fromj EU045 indoor air quality kit and I am using the ULP mode.

Where can I find the library version?

Thank you for your support.

Best Regards,

David

Hello David,

Apologies for the delay.

You can find the different libraries we provide for the different operation modes and algorithms in the webpage of ZMOD4410 sensor. (https://www.renesas.com/us/en/products/sensor-products/environmental-sensors/metal-oxide-gas-sensors/zmod4410-firmware-configurable-indoor-air-quality-iaq-sensor-embedded-artificial-intelligence-ai#design_development)

For ULP this is the library:

You can download it here: (https://www.renesas.com/us/en/document/swo/zmod4410-iaq-and-tvoc-firmware-ultra-low-power-ulp?r=454426) and we provide precompiled libraries for ULP operation for many different target MCUs and toolchains.

Current version of this library as mentioned in the release note of the ULP operation mode library is 1.3.0:

The sampling rate is 90 s for this operation mode:

An active measurement is indicated when the heater temperature is greater than zero.

Now regarding the heater temperature depending on the rmox value during active phase, yes your assumption is correct:

rmox[0]-> heater temp is 100 Celsius degrees.

rmox[1]-> heater temp is 150 Celsius degrees.

rmox[2]-> heater temp is  200 Celsius degrees

rmox[3]-> heater temp is  250 Celsius degrees

rmox[4]->heater temp is  300 Celsius degrees

rmox[5]-> heater temp is  350 Celsius degrees

rmox[6]-> heater temp is  400 Celsius degrees

rmox[7]-> heater temp is  350 Celsius degrees

rmox[8]-> heater temp is  300 Celsius degrees

rmox[9]-> heater temp is  250 Celsius degrees

rmox[10]-> heater temp is  200 Celsius degrees

rmox[11]->heater temp is  150 Celsius degrees

rmox[12]-> heater temp is  100 Celsius degrees

Generally as mentioned in the datasheet the maximum temp of the heat sensor element can reach up to 500 Celsius degrees.

Hope it helps.

Best Regards,

IK_Renesas

Hello,

thank you for the detailed explanation and for the references to documentation/libraries.

Now it's all clear.

Best Regards,

David