Electronics > Projects, Designs, and Technical Stuff

High temperature part suggestion

(1/6) > >>

ali_asadzadeh:
Hi,
I want to design a data logger with a 170C working parts for a customer, they have a sensor with a 0-250mV full scale output, so I should read the sensor data with a 0.05% full scale and store it in a RAM and later I should send it to the PC, I need a 16-24Bit ADC, a MCU and about 4-8MB of RAM, a RTC for time tag and the whole system should work with a single 3.7V Li-ion battery for 3 days(72hours), it would be used in a high temperature environment, so the parts should with stand the environment (170C).

I'm trying to find the parts for the system, The parts seems pricey, so I came here to ask for advise and better priced parts. so far I could only find some parts for the ADC, something like ads1278,
But it's pricey, I need to find the MCU (I prefer ARM Cortex) and RAM  and RTC too, But digikey does not seems helping me in here. do you have any parts in mind?
There seems to be no RAM and RTC in this working temp |O

DO we have chinese parts?

Whales:
I often see parts rated to 150C, but not often anything more than high-power discretes rated above that.  I suspect it's a limitation of the IC processes/chemistries commonly used for memory & dense logic.

Sadly I don't think automotive parts are rated that high either, which knocks out a big possible market.  Hopefully you're not stuck with space-rated level parts.

Ordinary search engines might be a better idea for researching this.  There are some companies that claim to provide such parts, but I am going to assume they're $$$ and slow/clunky ordering.

https://www.voragotech.com/products-main/#arm-microcontrollers

EDIT: 3 days of operation.  Hmm, I wonder how much thermal mass and insulation you would need to get away with more standard 100-150degC parts.

I wanted a rude username:
You might need to think (literally) outside the box.

You could run the sensor cables to a monitor outside the environment. If the length is too long, devise a primitive modulator.

An IR thermometer could perform measurements from outside the environment through the correct type of glass.

You could use sacrificial cooling, e.g. water with a steam vent. An insulated device containing a sizeable water bath would be able to stay at 100° for a long time.

Etcetera ...

mzzj:
Small-ish thermos bottle filled with water, boiling keeps the temp at 100C

ali_asadzadeh:
It would be used for deep down hole drilling for oil! so these solutions would not apply! Now I need to find a RAM and the RTC :-X

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod