Difference between revisions of "AXIOM Beta/Temperatures"
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temperature [°C] = (RETURN_VALUE - 572.92) / 2.43 | temperature [°C] = (RETURN_VALUE - 572.92) / 2.43 | ||
</pre> | </pre> | ||
The CMV12000 is meant to operate as cool as possible as a temperature increase means visible image noise increase. In normal operation the image sensor is just a few degrees above room temperature. | |||
Revision as of 06:56, 20 July 2020
1 Different Temperature Sensors
The AXIOM Beta hardware contains several temperature sensors (some dedicated sensors some integrated in other chips) the different chips and components are also operating at different temperature ranges. The Zynq for example has a rather hot operation range but the image sensor is meant to be as cold as possible meaning just a few degrees above room temperature. This page is a collection of information related to reading the different temperatures throughout the hardware.
1.1 MicroZed™ Zynq 7020
The Zynq 7020 has a maximum operating temperature of 85°C and has a special heat sink attached.
The temperature can be read with the
axiom-zynq-info.sh
script (AXIOM Beta Firmware Version 2.0) which contains the following code lines:
ZTO=`cat /sys/devices/soc0/amba/*.adc/iio*/in_temp0_offset`
ZTR=`cat /sys/devices/soc0/amba/*.adc/iio*/in_temp0_raw`
ZTS=`cat /sys/devices/soc0/amba/*.adc/iio*/in_temp0_scale`
ZT=`dc -e "5k $ZTR ${ZTO/-/_} + $ZTS * 1000 / p"`
printf "%-14.14s\t%8.4f °C\n" "Temp" $ZT
1.2 Power Board
The AXIOM Beta Power Board contains a dedicated LM75 digital thermometer (datasheet) which can be read with the following command:
cat /sys/class/hwmon/hwmon0/temp1_input
The output divided by 1000 is provided in °C.
The normal operation range of the Power Board goes until 60°C but should not exceed 75°C.
1.3 CMV12000 Image Sensor
The image sensor contains an integrated temperature sensor, see CMV12000 datasheet chapter 7.6.5 Temperature Sensor for reference.
This value can be read by running (AXIOM Beta Firmware Version 2.0):
axiom-cmv-reg.sh 127
The return value needs to be processed to acquire the temperature in degrees (the 𝐶𝐿𝐾_𝐼𝑁 is currently 20.833):
temperature [°C] = (RETURN_VALUE - 572.92) / 2.43
The CMV12000 is meant to operate as cool as possible as a temperature increase means visible image noise increase. In normal operation the image sensor is just a few degrees above room temperature.