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Discussion Groups | | 68HC11 ADC12138 interface

68HC11 ADC12138 interface - A Demir - Jul 19 16:11:00 2002

Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam


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RE: 68HC11 ADC12138 interface - Alowonle, Musibau - Jul 19 16:24:00 2002

Hi Adam,

I did this on my last project. What kind of information are you looking for,
hardware/Software implementation?

Regards,
Musibau

-----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 4:11 PM
To:
Subject: [m68HC11] 68HC11 ADC12138 interface Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam
To unsubscribe from this group, send an email to:





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Re: 68HC11 ADC12138 interface - A Demir - Jul 19 17:20:00 2002

Hi Musibau
I used National's AN-929 application sheet which interfaces HC11 to ADC
12038 chip .The application included an HC11 assembly software for the
project . I spent a considerable time on the project but the end result
was of no avail .If you have a working project (hardware /software ) to
share , I would be grateful .
Regards
Adam
--- Original Message -----
From: "Alowonle, Musibau" <>
To: <>
Sent: Saturday, July 20, 2002 9:24 AM
Subject: RE: [m68HC11] 68HC11 ADC12138 interface > Hi Adam,
>
> I did this on my last project. What kind of information are you looking
for,
> hardware/Software implementation?
>
> Regards,
> Musibau
>
> -----Original Message-----
> From: A Demir [mailto:]
> Sent: Friday, July 19, 2002 4:11 PM
> To:
> Subject: [m68HC11] 68HC11 ADC12138 interface > Hi All
> Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
> converter with 68HC11 using its serial perifheral interface . Any
> suggestions will be appreciated .
> Regards
> Adam >
> To unsubscribe from this group, send an email to: > To unsubscribe from this group, send an email to:




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RE: 68HC11 ADC12138 interface - Peter Mackel - Jul 22 2:42:00 2002

Adam

I have interfaced an ADS1212 with a HC11E1CFN2 in my current design and it
works well. If you like I will be happy to send you some info on it. If
you email me at my private address I will send on anything that may help you
(don't think I can attach files on this list).

Regards

Peter

****************************************************
Peter Mackel
Design Engineer
Tel: +44 2891 278528
Fax: +44 2891 270156
Email:
**************************************************** -----Original Message-----
From: A Demir [mailto:]
Sent: 19 July 2002 23:20
To:
Subject: Re: [m68HC11] 68HC11 ADC12138 interface Hi Musibau
I used National's AN-929 application sheet which interfaces HC11 to ADC
12038 chip .The application included an HC11 assembly software for the
project . I spent a considerable time on the project but the end result
was of no avail .If you have a working project (hardware /software ) to
share , I would be grateful .
Regards
Adam
--- Original Message -----
From: "Alowonle, Musibau" <>
To: <>
Sent: Saturday, July 20, 2002 9:24 AM
Subject: RE: [m68HC11] 68HC11 ADC12138 interface > Hi Adam,
>
> I did this on my last project. What kind of information are you looking
for,
> hardware/Software implementation?
>
> Regards,
> Musibau
>
> -----Original Message-----
> From: A Demir [mailto:]
> Sent: Friday, July 19, 2002 4:11 PM
> To:
> Subject: [m68HC11] 68HC11 ADC12138 interface > Hi All
> Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
> converter with 68HC11 using its serial perifheral interface . Any
> suggestions will be appreciated .
> Regards
> Adam >
> To unsubscribe from this group, send an email to: > To unsubscribe from this group, send an email to:
To unsubscribe from this group, send an email to:



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RE: 68HC11 ADC12138 interface - Grodevant, Scott - Jul 22 9:13:00 2002

Hi all and Adam,

Yes. I used the AD12130 with a 68HC11A1 several years ago. After spending
lots of time on the phone with National's technical support, we found a
solution. The problem is that this family of ADC is particularly
susceptible to digital switching noise caused by fast rise and fall times on
it's control signals. These transients cause ground bounce in the chip and
apparently put it into some odd state where it doesn't respond properly.

The solution is to put R-C low-pass filters on all of it's digital input
signals. I found series 1.5K ohm resistors and 22 pF capacitors to digital
ground did the trick. Unfortunately this solution is pretty messy for
existing boards. Our boards were built with surface mount components. I
lifted the ADC leads and placed 1206 resistors between the PCB pads and
lifted leads. I then tacked the caps to the leads, and wired their free
ends to ground. I wasn't too pretty but did solve the problem.
Best Regards,
Scott Grodevant
Sr. Electronics Engineer
Lucid, Inc. -----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 5:11 PM
To:
Subject: [m68HC11] 68HC11 ADC12138 interface Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam

[Non-text portions of this message have been removed]




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RE: 68HC11 ADC12138 interface - Peter Mackel - Jul 22 11:11:00 2002

Scott

All these emails are starting to get me slightly concerned. Are you talking
about the Burn Brown (now owned by Texas) ADS1212? I didn't have any
problems (apart from the initial teething problems with initialising and
calibrating etc) with it, but that doesn't reassure me that I've covered
everything on it?

It's just that you mentioned the AD1213 and Adam mentioned the ADC1213. Is
is the same family?

Thanks

Pete

-----Original Message-----
From: Grodevant, Scott [mailto:]
Sent: 22 July 2002 15:14
To: '
Subject: RE: [m68HC11] 68HC11 ADC12138 interface Hi all and Adam,

Yes. I used the AD12130 with a 68HC11A1 several years ago. After spending
lots of time on the phone with National's technical support, we found a
solution. The problem is that this family of ADC is particularly
susceptible to digital switching noise caused by fast rise and fall times on
it's control signals. These transients cause ground bounce in the chip and
apparently put it into some odd state where it doesn't respond properly.

The solution is to put R-C low-pass filters on all of it's digital input
signals. I found series 1.5K ohm resistors and 22 pF capacitors to digital
ground did the trick. Unfortunately this solution is pretty messy for
existing boards. Our boards were built with surface mount components. I
lifted the ADC leads and placed 1206 resistors between the PCB pads and
lifted leads. I then tacked the caps to the leads, and wired their free
ends to ground. I wasn't too pretty but did solve the problem.
Best Regards,
Scott Grodevant
Sr. Electronics Engineer
Lucid, Inc. -----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 5:11 PM
To:
Subject: [m68HC11] 68HC11 ADC12138 interface Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam

[Non-text portions of this message have been removed]
To unsubscribe from this group, send an email to:



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RE: 68HC11 ADC12138 interface - Grodevant, Scott - Jul 22 13:02:00 2002

Hi all and Pete,

I mistyped, the part I used was National Semiconductor's ADC12130. Sounds
like you had considerably less trouble with it than I did. I suspect they
have redone the design and/or chip layout to reduce that ground bounce
problem I was talking about. It drove me nuts for weeks. After changing
chips and having the second chip behave identically to the first, I had no
choice but to doubt my code. After painstakingly checking out all signal
timing with an oscilloscope and finding everything within specifications, I
finally called National's support line.

I spoke with Jack Thornton (I'm not sure of the spelling of his last name),
who is an incredible support engineer! He is knowledgeable and very
helpful. His number is (800) 272-9959. The problem is that the ground
bounce causes the CPU and ADC SPI transactions to intermittently get out of
sync with one and other, causing my problem. I had used many SPI and I2C
devices before this and never had any sort of problems. My notes are back
from 1998, I suspect the chip was pretty new back them, maybe just released.

Regards,
Scott
-----Original Message-----
From: Peter Mackel [mailto:]
Sent: Monday, July 22, 2002 12:11 PM
To:
Subject: RE: [m68HC11] 68HC11 ADC12138 interface Scott

All these emails are starting to get me slightly concerned. Are you talking
about the Burn Brown (now owned by Texas) ADS1212? I didn't have any
problems (apart from the initial teething problems with initialising and
calibrating etc) with it, but that doesn't reassure me that I've covered
everything on it?

It's just that you mentioned the AD1213 and Adam mentioned the ADC1213. Is
is the same family?

Thanks

Pete

-----Original Message-----
From: Grodevant, Scott [mailto:]
Sent: 22 July 2002 15:14
To: '
Subject: RE: [m68HC11] 68HC11 ADC12138 interface Hi all and Adam,

Yes. I used the AD12130 with a 68HC11A1 several years ago. After spending
lots of time on the phone with National's technical support, we found a
solution. The problem is that this family of ADC is particularly
susceptible to digital switching noise caused by fast rise and fall times on
it's control signals. These transients cause ground bounce in the chip and
apparently put it into some odd state where it doesn't respond properly.

The solution is to put R-C low-pass filters on all of it's digital input
signals. I found series 1.5K ohm resistors and 22 pF capacitors to digital
ground did the trick. Unfortunately this solution is pretty messy for
existing boards. Our boards were built with surface mount components. I
lifted the ADC leads and placed 1206 resistors between the PCB pads and
lifted leads. I then tacked the caps to the leads, and wired their free
ends to ground. I wasn't too pretty but did solve the problem.
Best Regards,
Scott Grodevant
Sr. Electronics Engineer
Lucid, Inc. -----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 5:11 PM
To:
Subject: [m68HC11] 68HC11 ADC12138 interface Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam

[Non-text portions of this message have been removed]
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RE: 68HC11 ADC12138 interface - Grodevant, Scott - Jul 22 13:05:00 2002

One last thing:

I forgot to say that once this initial problem was solved, I had no other
problems with the part. I'd like to tell you we built thousands of the
device, but as it turns out the project was cancelled. I think at best I
used maybe five of these parts. They did all behave consistently.

Scott -----Original Message-----
From: Peter Mackel [mailto:]
Sent: Monday, July 22, 2002 12:11 PM
To:
Subject: RE: [m68HC11] 68HC11 ADC12138 interface Scott

All these emails are starting to get me slightly concerned. Are you talking
about the Burn Brown (now owned by Texas) ADS1212? I didn't have any
problems (apart from the initial teething problems with initialising and
calibrating etc) with it, but that doesn't reassure me that I've covered
everything on it?

It's just that you mentioned the AD1213 and Adam mentioned the ADC1213. Is
is the same family?

Thanks

Pete

-----Original Message-----
From: Grodevant, Scott [mailto:]
Sent: 22 July 2002 15:14
To: '
Subject: RE: [m68HC11] 68HC11 ADC12138 interface Hi all and Adam,

Yes. I used the AD12130 with a 68HC11A1 several years ago. After spending
lots of time on the phone with National's technical support, we found a
solution. The problem is that this family of ADC is particularly
susceptible to digital switching noise caused by fast rise and fall times on
it's control signals. These transients cause ground bounce in the chip and
apparently put it into some odd state where it doesn't respond properly.

The solution is to put R-C low-pass filters on all of it's digital input
signals. I found series 1.5K ohm resistors and 22 pF capacitors to digital
ground did the trick. Unfortunately this solution is pretty messy for
existing boards. Our boards were built with surface mount components. I
lifted the ADC leads and placed 1206 resistors between the PCB pads and
lifted leads. I then tacked the caps to the leads, and wired their free
ends to ground. I wasn't too pretty but did solve the problem.
Best Regards,
Scott Grodevant
Sr. Electronics Engineer
Lucid, Inc. -----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 5:11 PM
To:
Subject: [m68HC11] 68HC11 ADC12138 interface Hi All
Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
converter with 68HC11 using its serial perifheral interface . Any
suggestions will be appreciated .
Regards
Adam

[Non-text portions of this message have been removed]
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RE: 68HC11 ADC12138 interface - Alowonle, Musibau - Jul 22 14:30:00 2002

Hi Adam,

I'm glad you mentioned the Ap-note 929. This is all you need to develop the
hardware and software, but there is a mistake on figure-7 of the Ap-note.
The mistake is that MOSI and MISO are interchanged on that figure. It is
very critical to have this connection right in order for the device to work
properly. My application interfaces the ADC12034 to MC68HC11k4. Not all
connections are shown in figure-7 of AP-929. Connections not shown that I
made are the following: see data sheet for ADC12034

1. Pin6 tied to Pin7
2. Pin8 tied to Pin9
3. Pin5, 15 and 17 tied to GND.
4. CCLK (pin22) is supplied to the ADC by the HC11

Once you have all your connections right, check out page7 (flow chart) of
AP-929 for software implementation. It's very easy to follow. For additional
information you can go to the National website and look at the data sheet
for this family of parts. There are lots of helpful information in this data
sheet.

Also Jack Thorton (1-800-272-9959)of NSC is a very helpful resource, I spoke
to him several times while working on my project.

Regards,
Musibau

-----Original Message-----
From: A Demir [mailto:]
Sent: Friday, July 19, 2002 5:20 PM
To:
Subject: Re: [m68HC11] 68HC11 ADC12138 interface Hi Musibau
I used National's AN-929 application sheet which interfaces HC11 to ADC
12038 chip .The application included an HC11 assembly software for the
project . I spent a considerable time on the project but the end result
was of no avail .If you have a working project (hardware /software ) to
share , I would be grateful .
Regards
Adam
--- Original Message -----
From: "Alowonle, Musibau" <>
To: <>
Sent: Saturday, July 20, 2002 9:24 AM
Subject: RE: [m68HC11] 68HC11 ADC12138 interface > Hi Adam,
>
> I did this on my last project. What kind of information are you looking
for,
> hardware/Software implementation?
>
> Regards,
> Musibau
>
> -----Original Message-----
> From: A Demir [mailto:]
> Sent: Friday, July 19, 2002 4:11 PM
> To:
> Subject: [m68HC11] 68HC11 ADC12138 interface > Hi All
> Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
> converter with 68HC11 using its serial perifheral interface . Any
> suggestions will be appreciated .
> Regards
> Adam >
> To unsubscribe from this group, send an email to: > To unsubscribe from this group, send an email to:
To unsubscribe from this group, send an email to:



______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!


(You need to be a member of m68hc11 -- send a blank email to m68hc11-subscribe@yahoogroups.com )

Re: 68HC11 ADC12138 interface - A Demir - Jul 22 17:31:00 2002

Hi All
Thank you all for your suggestions .
Regards
Adam
----- Original Message -----
From: "Grodevant, Scott" <>
To: <>
Sent: Tuesday, July 23, 2002 2:13 AM
Subject: RE: [m68HC11] 68HC11 ADC12138 interface > Hi all and Adam,
>
> Yes. I used the AD12130 with a 68HC11A1 several years ago. After spending
> lots of time on the phone with National's technical support, we found a
> solution. The problem is that this family of ADC is particularly
> susceptible to digital switching noise caused by fast rise and fall times
on
> it's control signals. These transients cause ground bounce in the chip
and
> apparently put it into some odd state where it doesn't respond properly.
>
> The solution is to put R-C low-pass filters on all of it's digital input
> signals. I found series 1.5K ohm resistors and 22 pF capacitors to
digital
> ground did the trick. Unfortunately this solution is pretty messy for
> existing boards. Our boards were built with surface mount components. I
> lifted the ADC leads and placed 1206 resistors between the PCB pads and
> lifted leads. I then tacked the caps to the leads, and wired their free
> ends to ground. I wasn't too pretty but did solve the problem. >
> Best Regards,
> Scott Grodevant
> Sr. Electronics Engineer
> Lucid, Inc. > -----Original Message-----
> From: A Demir [mailto:]
> Sent: Friday, July 19, 2002 5:11 PM
> To:
> Subject: [m68HC11] 68HC11 ADC12138 interface > Hi All
> Has anyone intrerfaced ADC12138 (or ADC12xxx series ) analog to digital
> converter with 68HC11 using its serial perifheral interface . Any
> suggestions will be appreciated .
> Regards
> Adam >
>
> [Non-text portions of this message have been removed] >
> To unsubscribe from this group, send an email to:



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