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'[EE]: uA TO-92 temp sensor'
2004\09\25@124334 by Charles Craft

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I've been using a Microchip TC1047A (3/SOT-23) for a project.
Microchip doesn't make a TO-92 temp sensor.

National makes the LM19, LM34 and LM35 low current sensors in TO-92.
I looked at the Maxim/Dallas 1-wire devices but their active current is 1mA which is
my current budget for the whole board.

Anyone used an analog or serial output low current temp sensor in a TO-92 package?

thanks
chuckc



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2004\09\25@204612 by Mike Hord

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Why limit yourself to the TO92 sensor?  Simplicity?

I have a system in development now that uses <400 uA
to do temp measurement (and lots of other stuff), and it
uses a thermistor.  And gets accuracy to .1 deg C.

OTOH, it can't just pull a binary value for the temp over
SPI, so that's the tradeoff:  needing to calculate the value
rather than having it handed to you.  Cost may be an issue
too.

Mike H.

On Sat, 25 Sep 2004 12:43:33 -0400 (GMT-04:00), Charles Craft
<spam_OUTchuckseaTakeThisOuTspammindspring.com> wrote:
{Quote hidden}

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2004\09\25@232411 by Charles Craft

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I've built a SMT prototype and now working on a thru-hole version that people could build on
one of those dreaded plastic prototyping boards or a chunk of perfboard from Radio Shack.

So far it's an exercise in a simple temp reading, low power consumption and bit bang RS-232 comms.
Thermistors aren't rocket science but more than I want to tackle in this project.

{Original Message removed}

2004\09\26@045329 by Roland

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But they do have the TC74 in a TO220 package, so you can bolt it to things;

200uA operating
5uA standby
I2C bus

Regards
Roland


At 12:43 PM 25/09/04 -0400, you wrote:
>I've been using a Microchip TC1047A (3/SOT-23) for a project.
>Microchip doesn't make a TO-92 temp sensor.
>
>National makes the LM19, LM34 and LM35 low current sensors in TO-92.
>I looked at the Maxim/Dallas 1-wire devices but their active current is
1mA which is
>my current budget for the whole board.
>
>Anyone used an analog or serial output low current temp sensor in a TO-92
package?
{Quote hidden}

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2004\09\27@030908 by SO-8859-1?Q?Ruben_J=F6nsson?=

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Hi,

> I've been using a Microchip TC1047A (3/SOT-23) for a project.
> Microchip doesn't make a TO-92 temp sensor.
>
> National makes the LM19, LM34 and LM35 low current sensors in TO-92.
> I looked at the Maxim/Dallas 1-wire devices but their active current is 1mA which is
> my current budget for the whole board.

The active current is only during conversion, which takes less than 100ms for 9 bit resolution (0.5 degrees). If you don't need continous temperature conversion (temperature change is usually very slow), you could perhaps use stored enery in a capacitor to supply the sensor during temperature conversion. Depending on how often the conversion is done, you can get a very low average current consumption.

==============================
Ruben Jönsson
AB Liros Electronic
Box 9124, 200 39 Malmö, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
.....rubenKILLspamspam@spam@pp.sbbs.se
==============================

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2004\09\27@091950 by markp

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>
>
>Anyone used an analog or serial output low current temp sensor in a TO-92
package?
>
>thanks
>chuckc


I've used Analog Devices' AD590 and AD592 temp sensors and they have worked
very well for me.  The AD592 is in a TO92 package.  It limits current
through it to 1 uA per degree Kelvin.  Check it out at:

http://www.analog.com/UploadedFiles/Data_Sheets/136700329AD592_a.pdf

Mark Peterson

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