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Hi,
My name is Jerry George and I work with a inverter design company in Melbourne, Australia.
We are using two LM35DZ temperature sensors in our power modules but when we run the end of line tests it shows as high temperature alert and one of the LM35DZ temperature sensors fail 90% of the time and the other temperature sensor fails 10% of the time.
We keep replacing the temperature sensors but they fail most of the time.
Does it have something to do with the conditions in the inverter?
Also, can the output of one LM35DZ temperature sensor be connected to the output of the other LM35DZ temperature sensor?
I am hoping to hear from you soon.
I appreciate your help.
Thanks.
Kind regards,
Jerry George
Hi Jerry,
Thank you for posting to the Sensing forum.
Can you please provide your schematic of the LM35?
Best regards,
Nicole
Hi Nicole,
Thank you for replying.
I cannot provide the schematic of the LM35 as it is company intellectual property.
Can I connect the output of one LM35 to the output of another LM35?
I am hoping to hear from you soon.
I appreciate your help.
Thanks.
Kind regards,
Jerry
Hi Jerry,
The LM35 devices can share a common power/ground but should not share an output.
Best regards,
Nicole
So, in essence, we cannot connect the output of one LM35 to another LM35 temperature sensor. Am I right?
Hi Jerry,
The output pins should not be shorted together, as this implementation is outside of normal operating conditions and may damage the devices. Both VOUT pins will be forcing a voltage proportional to the measured temperature, effectively disabling the measurement capability of each device.
Best regards,
Nicole