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'[PIC:] Micro with internal temp sensor'
2004\05\12@021456 by Charles Craft

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www.silabs.com/products/microcontroller/mlp.asp

I want an easy to build RS-232 temperature probe.

With Microchip parts it's MAX-232, PIC and a Microchip temp sensor chip.
Not interested in using the watchdog timer variance to measure temp. %-)

Anyone seen a microprocessor/microcontroller with integrated temp sensor?
The Silicon Labs chips are overkill and come in a funky little package.

Does Dallas Semi / Maxim offer a temp chip that just needs a MAX-232?

thanks
chuckc

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2004\05\12@024025 by hael Rigby-Jones

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{Quote hidden}

Why not just use a thermistor coupled with the A/D module?

Regards

Mike




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2004\05\12@025307 by Charles Craft

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Component count.

For the small quantity of devices I want to build I'm more interested in cutting number of components that
have to be sourced/acquired and installed. Cost difference between temp chip and thermistor doesn't matter.

A MAX232 with internal caps (expensive -yes!) and one other chip is the lowest parts count I could think of.

{Original Message removed}

2004\05\12@031629 by hael Rigby-Jones

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>-----Original Message-----
>From: Charles Craft [.....chuckseaKILLspamspam.....MINDSPRING.COM]
>
>Component count.
>
>For the small quantity of devices I want to build I'm more
>interested in cutting number of components that have to be
>sourced/acquired and installed. Cost difference between temp
>chip and thermistor doesn't matter.
>
>A MAX232 with internal caps (expensive -yes!) and one other
>chip is the lowest parts count I could think of.
>

Fair enough.  Analog Device MicroConverter series have on board temperature
sensors.  The available parts are based around an 8051 core (12 clock per
cycle, and 1 clock per cycle), but some nice looking ARM based parts should
be available soon.  Not too bad on pricing, <$5 for a basic 28pin device
with the 12 clock core, six 12bit ADC channels, two 12bit DAC channels
(proper DACs, not PWM), SPI/I2C and a UART.  Been looking at these and the
Silicon Labs parts for a while.

Don't know any micro's with inbuilt RS232 level shifters though ;o)

Regards

Mike




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2004\05\12@033327 by Charles Craft
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Thanks!

That's the family of devices that was discussed in the last couple weeks but I couldn't find the thread.

<$5 is 1000 qty pricing. Digikey is $8.56 in small qty and that 28-pin TSSOP package makes it tough
(not impossible) for home assembly. Probably no worse than the funky 11pin package from Si Labs. %-)

Thanks again
chuckc


{Original Message removed}

2004\05\12@041341 by Omer YALHI

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>Anyone seen a microprocessor/microcontroller with integrated temp sensor?

The MSP430F1232 (and some others) have what you are asking.  I don't know
how accurate it is though.  Look at the below example from TI's site:

void main(void)
{
 WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
 ADC10CTL1 = INCH_10+ADC10DIV_3;       // Temp Sensor ADC10CLK/4
 ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;

 while(1)
 {
   ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion start
   _BIS_SR(CPUOFF + GIE);              // LPM0 with interrupts enabled

//  oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = x*761/1024 - 468
   temp = ADC10MEM;
   IntDegF = ((temp - 630) * 761) / 1024;

//  oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = x*423/1024 - 278
   temp = ADC10MEM;
   IntDegC = ((temp - 673) * 423) / 1024;

   _NOP();                             // SET BREAKPOINT HERE
 }
}

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2004\05\12@042419 by steve

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> Anyone seen a microprocessor/microcontroller with integrated temp
> sensor?

Cypress PSoC's have a temperature sensor as part of the analog block.

Steve.


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TLA Microsystems Ltd             Microcontroller Specialists
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2004\05\12@112454 by Charles Craft

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Guess I've been using the Microchip web site too much.
Cypress gets the stealth website award for hiding data.
I looked there last night and didn't see anything.
Dug some more today based on your email and found Vtemp and flashtemp.
No sample code that I could find anywhere for Vtemp and flashtemp has 20 degree C accuracy. Ugh!

thanks for ACKing that they do have temp monitoring
chuckc


{Original Message removed}

2004\05\12@124627 by Matt Pobursky

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I'm an MSP430 and Cypress PSOC user and I know the MSP430's temp sensor
accuracy is better than the Cypress sensor -- something like +/- 4:C
error, uncalibrated. While better, that's still not great. If it were
me, I'd opt for a TO92 or SOT-23 temp sensor such as an LM34 (TO92) or
one of the SOT-23 parts from Microcjip. While adding another component,
it will be much more accurate than either of the on-board
microcontroller temp sensors.

BTW, I did a flowmeter/temperature meter for monitoring coolant in
plastics molding machines for one client that used an MSP430F437 chip.
It also uses an LM34. Just for grins, I wrote some code that calibrated
the onboard sensor and output data from both it and the external LM34
(also calibrated). Surprisingly, the response time was about the same
(in free air) and they tracked to within a tenth of a :F or two...
So I believe that if you go to the trouble of calibrating it, the
MSP430 sensor can actually be quite useful.

Matt Pobursky
Maximum Performance Systems

On Wed, 12 May 2004 11:25:05 -0400, Charles Craft wrote:
> Guess I've been using the Microchip web site too much. Cypress gets
> the stealth website award for hiding data. I looked there last night
> and didn't see anything. Dug some more today based on your email and
> found Vtemp and flashtemp. No sample code that I could find anywhere
> for Vtemp and flashtemp has 20 degree C accuracy. Ugh!
>
> thanks for ACKing that they do have temp monitoring

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2004\05\13@083305 by al smith

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BUT.....Cypress has indicated to me that using it as a temp sensor may not
be the best application. It is attached to the die of the chip, and not
really designed to be used like a LM75 temp sensor type application.

{Quote hidden}

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2004\05\13@084315 by Jan-Erik Soderholm

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al smith wrote :

> BUT.....Cypress has indicated to me that using it as a temp
> sensor may not be the best application. It is attached to the
> die of the chip, and not really designed to be used like a
> LM75 temp sensor type application.

Probably due to self-heating. You are actualy measuring the
temp of the chip itself, not the surounding environment.

But it might be used for adjustment of temp depending
peripherials in the chip itself, such as an INTOSC or baud
rate registers (if available, I don't know the PSoc at all...).

Jan-Erik.

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