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ARM7TDMI - Obtain ARM Core Temperature

Note: This was originally posted on 9th June 2011 at http://forums.arm.com

Hi All,

I want to measure the temperature of LPC2129 ARM processor core.
The LPC2129 manual doesnt show if there is a temperature sensor in the ARM core.
Is there any other way to obtain the temperature using some tools or code?
Is is possible to code in some RTOS to get the temperature details?

Thanks & Regards,

Bijju Kranthi V,
MTech Final Year Student,
IIT Kharagpur

Offline Pheonix Ashes over 9 years ago

Note: This was originally posted on 9th June 2011 at http://forums.arm.com

Can I use lm_sensors package for monitoring temperature for those ARM cores that support Embedded Linux on them ?

Thanks.
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Offline Pheonix Ashes over 9 years ago

Note: This was originally posted on 10th June 2011 at http://forums.arm.com

That was very informative.

Now assuming that I have the I2C code in place; can I port the lm_sensors package to the ARM processor without an underlying Embedded Linux ?
Does the package require other supporting files that are part of the kernel?

Thanks & Regards,
Bijju Kranthi V
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Offline Pheonix Ashes over 9 years ago

Note: This was originally posted on 10th June 2011 at http://forums.arm.com

Thanks very much Joseph.
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Offline Joseph Yiu over 9 years ago

Note: This was originally posted on 9th June 2011 at http://forums.arm.com

Hi there,

There is no temperature sensor in the processor core (ARM7TDMI).
Since the microcontroller you're using doesn't seem to have any temperature sensor, you need to add an external temperature sensor component. There are many temperature sensors you can use, for example, one with SPI interface, which can be (should be) connected to the SPI interface on you microcontroller chip. Google for "spi temperature sensor" will give you plenty of choices.
You will then need to program the SPI interface to detect the temperature.

For NXP chip specific questions, there is a public forum at http://tech.groups.yahoo.com/group/lpc2000/

regards,
Joseph
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Offline Joseph Yiu over 9 years ago

Note: This was originally posted on 10th June 2011 at http://forums.arm.com

I don't know about what is in the lm_sensors software package, but it seems to ise i2C rather than SPI.
So you will need software to control the I2C interface of your microcontroller, as well as code to wotk with the temperature sensor.
You might be able to port the lm_sensors code across, but still need to have the suitable I2C interface control code to work with it.

regards,
Joseph
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Offline Joseph Yiu over 9 years ago

Note: This was originally posted on 10th June 2011 at http://forums.arm.com

I don't know. It is best if you can download the source from http://www.lm-sensors.org/ and try it out.
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