HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
You must login to participate in this chat. Please login.

Power outage hit halfway through yesterday -- catching up.

Iron

Thank you Randy and Lauren.

Iron

16 bitsis good enough

Iron

error detection and filtering

Iron

Milli-volt to volts

Iron

Hello from Thornville, Ohio

Iron

Thanks Randy and Digi-Key.

Iron

@Randy Frank
Thanks Randy ; very informative
Thanks Design News & DigiKey

Iron

That's going to do it for today. Im sending the revised slide deck in now. Sorry for any confusion but thanks for attending

Blogger

Thank you Randy and have a great day. Signing off now.

Iron

I didnn't know of ZMDI (although admitedly, sensors aren't my field) ; besides TI, ADI, Maxim, Freescale : any other IC makers out there dedicated to smart sensors ?
MicroChip seems to have some chips with a "tendancy" towards sensors...

I also showed Analog Micro Systems IC. I'm not sure how many others they may offer. It turns out that sensor interfaces are often a target for startups. Sensor suppliers rarley offer signal conditioning/sensor interface circuits separte from sensors that they offer. The well established MCU suppliers address many sensor applications with general purpose MCUs.

Blogger

@Randy Frank

Have you used ICs and sensors from all of the mfrs shown on the slides in your production projects?

The last time I checked, Honeywell was making their own.  They also have some force sensors that could be useful for some applications.

Iron

@Randy, on slide 21 for altimeter application, differential pressure is used right? and low voltage for capacitance?

Slide 17  discusses the altimeter but I found that the link on slide 21 (soon to be slide 23) is worng. Use

http://zmdi.cdistore.com/datasheets/zmdi/ZSSC3123_cLite_Data_Sheet_rev_1_60_2013_05_20.pdf

 

For altimeters an absolute prssure senor is used with a reference sealed inside.

Blogger

Lauren - Is there a way for me to check if I have completed course evaluation forms for classes I have taken?

Iron

Does Honeywell make their own sensors, or just re-label chips from another vendor?

for 110$ and up!!!

Iron

Thanks Randy, Lauren, Digikey and ieee...

Honeywell might have some smart sensors, they surely have fully calibrated and buffered ones.

Iron

@Randy Frank
I didnn't know of ZMDI (although admitedly, sensors aren't my field) ; besides TI, ADI, Maxim, Freescale : any other IC makers out there dedicated to smart sensors ?
MicroChip seems to have some chips with a "tendancy" towards sensors...

Iron
dhajicek I had this in past with LEDS, you can't mask the components, we had to solder them after.

 

Iron

Randy's question was: What other output type have you had to deal with?

     Not much really different than you listed.

Iron

You'd have to mask the sensor openings so conformal coat did not get into the sensor itself.

Iron

Thank you so much Randy!

Iron

?Randy, I would think the general shape of the curve would be consistent for a given sensor design.  So maybe a simpler 2 or 3 point calibration would suffice for a lot of applications.  I'd go for a pre-compensated sensor myself, they aren't that much more expensive.

Iron

Randy, for pressure sensor chips that have the transducer built in (MEMS) must the PCB installation be free from any conformal coating?

From my experience, the sensor would be installed prior to any conformal coating that may be required for the targetted applications. Otherwise, a reliable  circuit connection would be very difficult to achieve unless you were hand soldering units one at a time.

Blogger

@Randy, on slide 21 for altimeter application, differential pressure is used right? and low voltage for capacitance?

Iron

@Randy Slightly OT, but, is there anything new in the works that you're aware of in the realm of absolute measurement gas sensors? (eg CO, NO2, CO2, etc) By which I mean factory-calibrated and/or self-calibrating integrated devices? (I ask particularly because you're from the world of automotive.)

Iron

Does a 16-bit ADC provide sufficient resolution for your designs or in some cases do you need more? How much?

16 bits for most applications, and 24 bits for others

Thanks Randy.  I go alot out of this presentation.

Iron

One expensive recurring cost is calibrating pressure sensors using either offset / gain adjustments or programmable constants stored in memory. Have you used any techniques for automating pressure sensor calibration over temperature and pressure using programmable memory? What did those steps look like?

Unless yuo buy a sensor with the cirucitry built in where the supplier guarantees a level of calibration/compentation and accuracy, I  do not know how to avoid making a measurement or two to determine how much offset exists and how different the output is from the required value once the sensor is added to the subsequent circuitry. After that is is a mtter of whether extenral resistors have to be trimmed or whether the circuit stores the values in digital memory

Blogger

Thank you Randy

I will try to downl;oad the slide deck again later to see if is complete.

 

What other factors have been required in your designs that would or could be provided by the signal conditioning interface?

Self-compensating and filtering

Thanks, Good presentation

Iron

@rlait, You complete the course survey or Evaluation form after the last class tomorrow.  You can be directed to the online form just above the chat window where it says "Course Evaluation Form: and Click here to be Directed to the Form.

Gold

@ElRoy - My experience has been that you must operate the sensor and the conditioning electronics over temperature and pressure, collect the output data points for temperature and pressure, then use a curve-fitting algorithm to get a set of coefficients for a polynomial that fits the data.  This process is called "self-characterization". The derived coefficients are stored with the device.  The system software uses the coefficients to evaluate the polynomial using temperature and pressure data from the device.  The polynomial will be a functiuon of both temperature and pressure, so it is a 2-dimensional curve fit.  There are many algorithms for the curve fit.  One program is called "crvfit" that lets you pick a polynomial model, then fits the data for you.  There are other programs out there that do this as well.

Randy, for pressure sensor chips that have the transducer built in (MEMS) must the PCB installation be free from any conformal coating?

What other output type have you had to deal with?

Resistive, capacitive and frequency

Randy, the ZSSC3170 IC features a max analog gain of 420.  Are these gains reproducible between chip batches or is this a dynamic gain that relative to the span of the signal itself?

Iron

I just rechecked the slide deck I submitted and it is short two slides (14 & 15)- the ones about the TI AFE lMP91200 and LMP91000. Sorry. I'll resubmit and you should be able to access the right slides perhaps later today.

Blogger

Cannot seem to get to the course survey.  Is there a URL other than the link above?  Or is this just a problem between my keyboard and chair?

Iron

?? Randy, What wireless protocols are typically used in pressure sensors -- LIN, CAN?

Gold

Have downloaded the ppt 3 times .. only 25 slides !!

Iron

Thanks Randy and Lauren

Iron

@Randy Frank

I downloaded the slide deck during the presentation and it is still out of sequence.

Thanks Randy, but I noticed only 25 slides on this presentation, not 27 as you described , is there a problem?

Iron

@Randy, my deck had only 25 slides and was missing a picture you were referring to. I tried downloading again just now and got the same result.

Gold

I wish these systems-on-chips were available years ago when I was designing air data systems for airplanes.

Randy the PPT we downloaded is different that what you have

Are you sure? Someone mentioned the TPMS and that should mean the slide deck is the one I provded.

Blogger

Thanks Rabdy.

My downlowd slide contains only 25 pages (tried twice)

Iron

@Randy our slide deck is a little different from what you have. Please re-post the correct slide deck. Thanks

Iron

Thanks Randy and Lauren.

Iron

Thank you Randy, Lauren, and Digi-Key.
Looking forward to downloading the latest slide deck.

Gold

Thanks Randy and Lauren.  Interesting to see how far the integration has come.

Iron

@Randy

One expensive recurring cost is calibrating pressure sensors using either offset / gain adjustments or programmable constants stored in memory. Have you used any techniques for automating pressure sensor calibration over temperature and pressure using programmable memory? What did those steps look like?

thanks,

Iron

Thanks Randy.  Good stuff again.

Looking forward to the session tomorrow as I am dealing with sensors and MCU's used in underwater products that have depth ratings of greater than 500 ft.

 

Iron

Thanks Randy and Lauren, thanks everyone.

Thanks for some good ideas Randy.

Iron

Thank you Randy, Design News, Digi-Key and Lauren!

Iron

Thanks. Please repost corrected slides.

Iron

Great presentation. Had no idea smart chips were so advanced.

Thanks Randy for another good session on sensors.

Thanks Randy for another very informative lecture.

Thanks Randy.  

 

Can we get an updated slide deck?

Iron

Thanks anyway Randy. Lots of good IC's to look at.

Iron

Thank you Lauren and Randy.

Iron

Thanks Randy and Lauren!

thank you Randy and Lauren

Iron

Thanks Randy and Lauren.

Iron

Thanks Randy and Lauren!

Iron

Thanks Randy for a great lecture.

Iron

Thanks the TPMS block diagram, automotive applications and discussion are great; thanks Randy.

Iron

Randy the PPT we downloaded is different that what you have

Same here... 25 is the last one

Iron

I WISH I HAD THE SAME SLIDE DECK THAT RANDY IS USING.

Iron

Redownloaded and slides are same

ditto here - slide 25 is "Later this week"

Iron

thanks Randy and Lauren

Iron

Thanks,

Today it was a confusing presentation,

 

Iron

Thank you Randy, Lauren & Digi-Key!

Iron

16 bits is adequate for most of our sensor apps

 

Iron

Zwilrich if your are missing slides, you migt want to re-download the set

Iron

I downloaded my slides before class and it seems to be alright.

my slides only go to 25???

Iron

Does the Freescale TPMS chip self calibrate? Can it actually read the pressure? (some sensors systems just provide an alarm point)

Summary is slide 24 for me

Iron

try to download it again

Iron

@Randy Frank
Could you re-post your slides ?  (or post two slides tomorrow...)
Today's session is obviously out of synch with yours !

Iron

@Randy Frank

Please post a PPT file with the correct sequency of slides.  Thanks!

@Randy I think some of your slides were out of sequence for this lecture 

Iron

TPMS diagram is slide 23

Iron

Could Randy set out the slide deck again.  Seems like we missed a few sheets.

Iron

slides not right for me either.. only have 25

there is no picture on slide 25

Freescale TPMS is slide 22 for me

Iron

I think some of the slides were out of sequence in the lecture

Iron

cLite is on slide 20 for me

Iron

16-bit OK in most cases

Iron

Allowing for the missing slides, we are on slide 18.

Iron

altimiter mentioned on slide 17

Iron

16 bit ias enough for moast applications 

Iron

Looks like slides got a little out of order Randy, around slide 15 to 18

Iron

missed a few slides

Iron

LIN is mentioned on slide 15

Iron

Looks like we're missing a couple of TI slides: 14 & 15

@Alaskaman66, 16 bits gives up to 65,535 values.  It's a measure of resolution, not accuracy, per se.

Gold

We are on slide 17. 

Platinum

I'd like to buy lower (cheaper) or higher (more expensive) resolution as needed.

 

Iron

16bits is just enough I beleieve unless floating point required then 24bits 

Iron

We are on slide 16. 

Platinum

16 bits is usually sufficient resolution.

Iron

16 bits is pleanty for my needs.

I can usually get by with about 7 bits if signal quality is good

Iron

Randy's? use just 12bits

16-bit it was usually more than enough

Iron

We are on slide 15. 

Platinum

16 bits works for my appplications

Iron

I deal with HVAC systems. we use 8-12 bits and that has been plenty for all our needs

Iron

16 bit is standard

 

Iron

16 bits is usually more than enough.

Iron

Audio seems to be cutting out intermittently, anyone else experiencing this?

Iron

24 Bit resolution  enough

Iron

16 bit is sufficient for our applications

Iron

I usually don't need more than 16 bits

Depends on proyect and its cost. I would like to work with more resolution bits.

Iron

What percent accuracy would a 16 bit device be able to provide?

16 is good enough for some applications.  24 bit for others.

Iron

Randy's question was: Does a 16-bit ADC provide sufficient resolution for your designs or in some cases do you need more? How much?

Platinum

24 bit would be fine.

Iron

serial connection

 

Iron

16 bits sounds like pretty good resolution

Gold

16 bits is more than enough for my application. Currently using 12 bits.

Iron

Twelve bit is usually sufficient for my projects.

Iron

We are on slide 13. 

Platinum

16 is more than adequate

Iron

Usually I use 16 bits and sometimes use a 24 bit delta-sigma

Iron

16 bit works adequately for my needs

Iron

16 bit resolution is adequate

Iron

16 bits is not quite enough for altimetry, 18 bits is much better.  24 is overkill.

16 bits has satisfied my resolution requirements up to this point

HI resolution and low noise

We are on slide 12. 

Platinum

joining late, sorry.

 

Iron

I like the idea fo built in test capability

Iron

We are on slide 11. 

Platinum

Isolation might be needed.

Iron

Averaging for specific periods.

Iron

Filtering and temperature measurement

Iron

High PSRR and low noise.

Iron

We are on slide 10. 

Platinum

I need at least 30 Hz frequency response.

Iron

some noise filtering

Iron

internal temperature reading

Iron

high noise isolation

Iron

High voltage isolation

Iron

Noise interferance and filtering

Iron

Operation in high noise environment

 

Iron

We are on slide 9. 

Platinum

Our default sensor output is 0.5 to 4.5Volts output. That way the PLC can detect wire breaks (0v)

Iron

band pass filtering and voltage isolation

 

Iron

just TTL level voltage only

Iron

jumper to select from current output to voltage output

Iron

I just want everything done for me... I'll take of the SPI or I2C data -- thanks. :-)

Iron

We are on slide 8. 

Platinum

Having to read higher frequencies from low level sensor in high noise environment.

I'd love to just see output as SPI, I2C etc. Bring it into my uC and not worry about anything else. Price concerns don't always allow that though.

Iron

I think you have covered my applications.

Iron

high voltage isolation would be provided in signal conditioning 

Iron

One of the difficult requirements for my sensor was an extreme cold environment -40 degrees C.

Frequency response and detection; for resonance identification for example

 

Large common mode voltage range

Iron

High electrical noise interference in immediate area

Iron

industry standard analog outputs

Iron

Error Detection, including bridge opens and shorts

self compensating and filtering to get a more stable signal

Iron

I wpuld need very low noise

Iron

Low power requirement which is affected by everything...

Iron

Sampling period for TDM signal

Iron

Randy's question was: What other factors have been required in your designs that would or could be provided by the signal conditioning interface?

Platinum

Mainly digital and analog voltage.

Iron

standard 4-20 mA mostly

Iron

Load cell or strin gauge and one similar to LVDT but was actually a variable transormer using AC.

Iron

Resistive and Capacitive only

Iron

Digital, Analog, SPI, I2C whatever

Iron

Nothing exotic - mainly an analog voltage connected to an ADC.  Smart sensors usually I2C

just the basics. using op-amps to amplify

Iron

I had a pressure sensor on glass fiber use interferometric optical output.

Iron

resistive and also SPI

Iron

mostly what you listed.

Iron

Piezoresistive, piezoelectric, and optical for clinical applications

Iron

Just resistive and voltage outputs so far.

I think you have covered them all, unless you mean a custom sensor with strain gages (resistive).

Iron

I have not yet used any outputs that are more exotic than those listed.

same the list, no other types

Iron

I've not really dealt with any exotic types: resistive thermocouple, hall effect switch that was preconditioned

Iron

light, microwave, electrochemical reactions

primarily resistive, optical, occasionally inductive...

 

Iron

Nothing exotic, just resistive, capacitive, inductive, and piezoelectric.

Iron

One of my designs used a PWM output, converted to digital with a counter.

just low-level bridge output voltages

Iron

Same as listed in slide 3

Iron

Randy's? dealt with all and voltage output as well.

nothing exotic; just analog

Gold

You have listed the ones I have had to deal with.

 

Iron

Have just been involved with those listed.

Iron

Just resistive and capactive so far.......

Iron

We are on slide 5. 

Platinum

Randy's question was: What other output type have you had to deal with?

Platinum

Hello from Pittsburg

Iron

audio clear on chrome

Iron

I hav eaudio in Firefox

 

Iron
Tried a few times. Sorry but no audio for me. I log out
Iron

We are on slide 4. 

Platinum

Hello from Montreal, QC

 

Iron

band-pass filtering, DC blocking caps, isolation transformers, what else for signal conditioning?

 

Iron

Hi Good afternoon from Boston, MA

I hace audio ; try refreshing : F5

Iron

audio is clear and steady

 

Iron

Good afternoon from Winston-Salem

 

Iron

Hi from Calgary Alberta

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Good afternoon from Minnetonka, MN.

Iron

Hello from SW Michigan

Iron

Hello from Fremont, CA

Iron

Hello from Chicago

Iron

Hello from Austin, TX

Iron

Hello from Cedar Park TX

Iron

Hello from windy Beavercreek, OH where the garden planting frenzy is in full swing

Hello from Oviedo, Spain

Iron

 

hello from Mishawaka

 

Iron

greetings from slc ut..

Good evenning from Valladolid, Spain, the land of "Ribera de Duero" wine.

Iron

Hello from Co Springs!

Iron

Good Morning from sunny Valdez

Hi. We'll start in about 13 minutes - until then...

Blogger

Hello from Albuquerque.

Iron

Lauren - Is there a way for me to check if I have completed course evaluation forms for classes I have taken?

Iron

hello everyone from Timisoara, Romania

Iron

You are eligible to earn IEEE Professional Development Hours by attending these courses and participating in the chat function. Additionally, we are no longer using the points system, offering "graduation", or giving grades. The IEEE hours are taking the place of that. There are some important things for you to know about earning the hours. The most important ones are that you need to attend these courses live, you need to attend a minimum of two of them per semester, you need to fill out a course evaluation form within 2 weeks of the end of the class, you need to attend 4 out of the 5 classes per course, and you need to participate in the chat function every day you attend. Please click on the link at the top of this page that says "How do I earn IEEE professional development hours" to read all of these important details and more.

Platinum

greetings from classy san diego

Iron

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY and be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using #DigiKeyCEC.

Platinum

How are you Randy? I am looking forward for another great lecture.

Iron

Hello from Summerville, SC

Iron

Hello from sunny SE Lake Simcoe Ontario Canada

Iron

Howdy from Tomball, TEXAS!

Iron

The streaming audio player will appear at the top of this web page when the show starts at 2 PM Eastern time today. When you see it, click on the play button to start the audio. Note however, that some companies block live audio streams. If when the show starts, the audio bar doesn't appear or you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. Also, make sure your flash player is updated with the current version. If that doesn't work, the class will be archived immediately following our live taping. You shouldn't experience any problems with the audio when listening on-demand.

Platinum

Hi from Panama City FL.

Iron

(and I'm in today using Chrome)

Iron

Other sites loaded just fine. We don't block sites to my knowledge.

Iron

I tried IE and chrome and it kept telling me that the URL couldn't be resolved. I even tried PINGing the www.designnews.com - no luck - probably a problem on my end. Thanks for the update.

Iron

JMax - the webinar worked fine yesterday

Iron

Greetings from sunny Buffalo, NY!

(Did anybody else have trouble accessing designnews.com yesterday? I couldn't get in until after 4pm EDT - I did get the archived class and slides)

Iron

Hi Goodafternoon from Boston, MA

Hello from sunny warm Montana

Gold

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Platinum

3rd consecutive Gorgeous Day - in Houston! (That's why I live here...well the employment situation here for Engrs is pretty kickin' too..)

Iron

Greetings and felicitations from North Pole, Alaska (AK)

Iron

Greetings from Somewhere on the Niagara Frontier.

Iron

Greetings from Plymouth, MN!

 

Iron

Good morning from Edmonton, AB

Iron

Greeting from Ghana @work

Iron

Hello from Oregon! Getting slides,



Partner Zone
Latest Analysis
This Gadget Freak Review looks at a keyless Bluetooth padlock that works with your smartphone, along with a system that tracks your sleep behavior and wakes you at the perfect time in your sleep cycle to avoid morning grogginess.
Siemens released Intosite, a cloud-based, location-aware SaaS app that lets users navigate a virtual production facility in much of the same fashion as traversing through Google Earth. Users can access PLM, IT, and other pertinent information for specific points on a factory floor or at an outdoor location.
Since 1987, teams of engineers around the world have built solar cars to participate in a road race around Australia called the World Solar Challenge, being tested on the race time, kilometers traveled, practicality, and energy used by the vehicles they invent.
An Israeli design student has created a series of unique pieces of jewelry that can harvest energy from default movements of the body and even use human blood as a way to conduct energy.
Made By Monkeys highlights products that somehow slipped by the QC cops.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 18 - 22, Embedded Software Development With Python & the Raspberry Pi
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service