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Groups > sci.electronics.design > #447672 > unrolled thread
| Started by | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| First post | 2017-02-14 14:47 -0800 |
| Last post | 2017-02-17 11:06 -0800 |
| Articles | 20 on this page of 89 — 21 participants |
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analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-14 14:47 -0800
Re: analog failures Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-14 15:05 -0800
Re: analog failures Reinhardt Behm <rbehm@hushmail.com> - 2017-02-15 10:52 +0800
Re: analog failures bill.sloman@ieee.org - 2017-02-14 19:00 -0800
Re: analog failures Reinhardt Behm <rbehm@hushmail.com> - 2017-02-15 11:55 +0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-15 07:53 -0800
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-15 08:30 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-15 10:19 -0800
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-15 10:53 -0800
Re: analog failures Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-15 10:58 -0800
Re: analog failures "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-15 21:25 -0600
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-15 20:18 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 15:44 -0500
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 15:30 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 14:05 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 17:16 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 14:38 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 17:58 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 15:37 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 18:51 -0500
Re: analog failures krw@notreal.com - 2017-02-17 20:27 -0500
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-17 17:56 -0800
Re: analog failures "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-17 21:03 -0600
Re: analog failures krw@notreal.com - 2017-02-17 22:36 -0500
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-19 00:45 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-19 08:32 -0800
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-21 12:31 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-23 14:57 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-23 12:02 -0800
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-17 17:27 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-17 20:39 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-18 07:41 -0800
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-18 08:04 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-18 08:16 -0800
Re: analog failures Reinhardt Behm <rbehm@hushmail.com> - 2017-02-16 06:49 +0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-16 07:14 -0800
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-16 07:24 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-16 07:41 -0800
Re: analog failures Reinhardt Behm <rbehm@hushmail.com> - 2017-02-17 13:22 +0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 06:58 -0800
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-17 12:26 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 14:03 -0800
Re: analog failures "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-17 21:05 -0600
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-18 08:07 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-18 08:20 -0800
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-18 09:20 -0800
Re: analog failures rickman <gnuarm@gmail.com> - 2017-02-19 00:48 -0500
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-21 12:39 -0800
Re: analog failures "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-21 22:54 -0600
Re: analog failures krw@notreal.com - 2017-02-17 20:33 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-18 07:37 -0800
Re: analog failures dagmargoodboat@yahoo.com - 2017-02-22 15:45 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-23 10:43 -0800
Re: analog failures krw@notreal.com - 2017-02-23 20:42 -0500
Re: analog failures "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-24 03:31 -0600
Re: analog failures grahamholloway@graham65.plus.com - 2017-02-24 06:39 -0800
Re: analog failures Don Kuenz <g@crcomp.net> - 2017-02-24 14:58 +0000
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-25 12:48 -0800
Re: analog failures pcdhobbs@gmail.com - 2017-02-26 04:39 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-26 07:52 -0800
Re: analog failures dagmargoodboat@yahoo.com - 2017-02-24 09:02 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-25 12:44 -0800
Re: analog failures dagmargoodboat@yahoo.com - 2017-02-26 08:29 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-26 09:46 -0800
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-26 10:11 -0800
Re: analog failures krw@notreal.com - 2017-02-26 17:55 -0500
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-26 15:09 -0800
Re: analog failures krw@notreal.com - 2017-02-26 19:30 -0500
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-27 10:37 -0800
Re: analog failures Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-24 09:14 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-25 12:46 -0800
Re: analog failures Klaus Kragelund <klauskvik@hotmail.com> - 2017-02-26 17:44 -0800
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-27 07:51 -0800
Re: analog failures Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-02-23 21:36 +0200
Re: analog failures dagmargoodboat@yahoo.com - 2017-02-24 08:38 -0800
Re: analog failures krw@notreal.com - 2017-02-24 20:20 -0500
Re: analog failures kevin93 <kevin@whitedigs.com> - 2017-02-24 17:36 -0800
Re: analog failures Ralph Barone <ralph@invalid.com> - 2017-02-15 03:25 +0000
Re: analog failures John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-14 19:20 -0800
Re: analog failures Tim Wescott <seemywebsite@myfooter.really> - 2017-02-14 17:46 -0600
Re: analog failures Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-14 17:50 -0700
Re: analog failures Tim Wescott <tim@seemywebsite.com> - 2017-02-14 23:49 -0600
Re: analog failures Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-15 07:03 -0700
Re: analog failures John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-15 10:18 -0800
Re: analog failures Tim Wescott <seemywebsite@myfooter.really> - 2017-02-15 15:06 -0600
Re: analog failures legg <legg@nospam.magma.ca> - 2017-02-16 23:06 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 07:00 -0800
Re: analog failures legg <legg@nospam.magma.ca> - 2017-02-17 13:22 -0500
Re: analog failures Joerg <news@analogconsultants.com> - 2017-02-17 11:06 -0800
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-02-17 12:26 -0800 |
| Message-ID | <8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com> |
| In reply to | #448002 |
On Fri, 17 Feb 2017 06:58:17 -0800, Joerg <news@analogconsultants.com> wrote: >On 2017-02-16 21:22, Reinhardt Behm wrote: >> AT Thursday 16 February 2017 23:14, Joerg wrote: >> >>> On 2017-02-15 14:49, Reinhardt Behm wrote: >>>> AT Wednesday 15 February 2017 23:53, Joerg wrote: >>>> >>>>> On 2017-02-14 19:55, Reinhardt Behm wrote: > >[...] > >>>>> >>>>>> I had the same with a part from Microchip. It has a config bit to >>>>>> automatically reset its I2C interface after a timeout period without >>>>>> any activity on the bus. This bit is reset after power on. So if the >>>>>> interface goes gaga because of a poor POR you never get it working. >>>>>> >>>>> >>>>> Oh-oh. Sounds like they built in a loose cannon for a sledgehammer. >>>>> However, a poor POR is something the circuit designer should take care >>>>> of. Never trust any on-chip POR/BOR. Ever. >>>> >>>> Good advice if the chip has no reset pin. :-( >>>> >>> >>> I've had designs where it was like your case and then my reset pin was >>> introduced by means of a P-channel in the VCC line. However, than meant >>> that the data lines had to be muxed and shut off as well or the chip >>> could be supplied through its diode paths. >>> >>> Only at the client's insistence. I prefer stuff that is more reliable. >>> In this case, for example, the LM35. Unfortunely that one needs a >>> negative supply if low temperatures have to be measured. >> >> I have already drawn my conclusions: Microchip is out. >> It was the same as with a DC/DC manufacturer. After the first heavy fail >> their sales called and I told him to come back when they have learned how to >> design. Never heard of him, maybe they have not yet learned it. >> > >I have had quite good experience with Microchip. Opamps, even some LDO >voltage regulators which were surprisingly stable (on the client's >insistence since I never use LDO). Most everybody has good parts and buggy parts. I want to start a web site about IC bugs, sort of an Angie's List of semiconductors. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-17 14:03 -0800 |
| Message-ID | <egpa97FdjfvU1@mid.individual.net> |
| In reply to | #448045 |
On 2017-02-17 12:26, John Larkin wrote: > On Fri, 17 Feb 2017 06:58:17 -0800, Joerg <news@analogconsultants.com> > wrote: > >> On 2017-02-16 21:22, Reinhardt Behm wrote: >>> AT Thursday 16 February 2017 23:14, Joerg wrote: >>> >>>> On 2017-02-15 14:49, Reinhardt Behm wrote: >>>>> AT Wednesday 15 February 2017 23:53, Joerg wrote: >>>>> >>>>>> On 2017-02-14 19:55, Reinhardt Behm wrote: >> >> [...] >> >>>>>> >>>>>>> I had the same with a part from Microchip. It has a config bit to >>>>>>> automatically reset its I2C interface after a timeout period without >>>>>>> any activity on the bus. This bit is reset after power on. So if the >>>>>>> interface goes gaga because of a poor POR you never get it working. >>>>>>> >>>>>> >>>>>> Oh-oh. Sounds like they built in a loose cannon for a sledgehammer. >>>>>> However, a poor POR is something the circuit designer should take care >>>>>> of. Never trust any on-chip POR/BOR. Ever. >>>>> >>>>> Good advice if the chip has no reset pin. :-( >>>>> >>>> >>>> I've had designs where it was like your case and then my reset pin was >>>> introduced by means of a P-channel in the VCC line. However, than meant >>>> that the data lines had to be muxed and shut off as well or the chip >>>> could be supplied through its diode paths. >>>> >>>> Only at the client's insistence. I prefer stuff that is more reliable. >>>> In this case, for example, the LM35. Unfortunely that one needs a >>>> negative supply if low temperatures have to be measured. >>> >>> I have already drawn my conclusions: Microchip is out. >>> It was the same as with a DC/DC manufacturer. After the first heavy fail >>> their sales called and I told him to come back when they have learned how to >>> design. Never heard of him, maybe they have not yet learned it. >>> >> >> I have had quite good experience with Microchip. Opamps, even some LDO >> voltage regulators which were surprisingly stable (on the client's >> insistence since I never use LDO). > > Most everybody has good parts and buggy parts. I want to start a web > site about IC bugs, sort of an Angie's List of semiconductors. > And then there are companies that have good ICs but they fall flat on their faces when you want to order ... <gasp> ... whole reels. -- Regards, Joerg http://www.analogconsultants.com/
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| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-02-17 21:05 -0600 |
| Message-ID | <o88di5$u9p$1@dont-email.me> |
| In reply to | #448045 |
"John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... > Most everybody has good parts and buggy parts. I want to start a web > site about IC bugs, sort of an Angie's List of semiconductors. Do it. Have one of those script kiddies in your basement* write one over the weekend. Stick ads on it, it'll pay for itself! (*I know, they moved out, and you moved out too for that matter. Just making reference to that.) Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-02-18 08:07 -0800 |
| Message-ID | <e5sgac9098ldom5ng23fp2esqnpkolp1hs@4ax.com> |
| In reply to | #448111 |
On Fri, 17 Feb 2017 21:05:27 -0600, "Tim Williams" <tiwill@seventransistorlabs.com> wrote: >"John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message >news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... >> Most everybody has good parts and buggy parts. I want to start a web >> site about IC bugs, sort of an Angie's List of semiconductors. > >Do it. Have one of those script kiddies in your basement* write one over >the weekend. Stick ads on it, it'll pay for itself! > >(*I know, they moved out, and you moved out too for that matter. Just >making reference to that.) > >Tim If there is someone out there who'd like to code and run a few web sites, a student maybe, I could pay them a modest stipend and share any ad revenue. I have too many ideas and too little time. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-18 08:20 -0800 |
| Message-ID | <egrai1FphoeU1@mid.individual.net> |
| In reply to | #448174 |
On 2017-02-18 08:07, John Larkin wrote: > On Fri, 17 Feb 2017 21:05:27 -0600, "Tim Williams" > <tiwill@seventransistorlabs.com> wrote: > >> "John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message >> news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... >>> Most everybody has good parts and buggy parts. I want to start a web >>> site about IC bugs, sort of an Angie's List of semiconductors. >> >> Do it. Have one of those script kiddies in your basement* write one over >> the weekend. Stick ads on it, it'll pay for itself! >> >> (*I know, they moved out, and you moved out too for that matter. Just >> making reference to that.) >> >> Tim > > If there is someone out there who'd like to code and run a few web > sites, a student maybe, I could pay them a modest stipend and share > any ad revenue. > If you had let off this statement on some of the newfangled social media your inbox would be flooded by Tuesday morning. > I have too many ideas and too little time. > Same here. I don't want to turn into a nerd but have time for some volunteering and sports activities which is why I ditch some ideas. -- Regards, Joerg http://www.analogconsultants.com/
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-02-18 09:20 -0800 |
| Message-ID | <cg0hacl7q4kl6ft2grssenkrofuvf61nl9@4ax.com> |
| In reply to | #448179 |
On Sat, 18 Feb 2017 08:20:30 -0800, Joerg <news@analogconsultants.com> wrote: >On 2017-02-18 08:07, John Larkin wrote: >> On Fri, 17 Feb 2017 21:05:27 -0600, "Tim Williams" >> <tiwill@seventransistorlabs.com> wrote: >> >>> "John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message >>> news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... >>>> Most everybody has good parts and buggy parts. I want to start a web >>>> site about IC bugs, sort of an Angie's List of semiconductors. >>> >>> Do it. Have one of those script kiddies in your basement* write one over >>> the weekend. Stick ads on it, it'll pay for itself! >>> >>> (*I know, they moved out, and you moved out too for that matter. Just >>> making reference to that.) >>> >>> Tim >> >> If there is someone out there who'd like to code and run a few web >> sites, a student maybe, I could pay them a modest stipend and share >> any ad revenue. >> > >If you had let off this statement on some of the newfangled social media >your inbox would be flooded by Tuesday morning. I want someone who understands a little about electricity. > > >> I have too many ideas and too little time. >> > >Same here. I don't want to turn into a nerd but have time for some >volunteering and sports activities which is why I ditch some ideas. OK, you can be a guest columnist. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | rickman <gnuarm@gmail.com> |
|---|---|
| Date | 2017-02-19 00:48 -0500 |
| Message-ID | <o8bbf2$nu2$2@dont-email.me> |
| In reply to | #448111 |
On 2/17/2017 10:05 PM, Tim Williams wrote: > "John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message > news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... >> Most everybody has good parts and buggy parts. I want to start a web >> site about IC bugs, sort of an Angie's List of semiconductors. > > Do it. Have one of those script kiddies in your basement* write one > over the weekend. Stick ads on it, it'll pay for itself! > > (*I know, they moved out, and you moved out too for that matter. Just > making reference to that.) Coding isn't the issue, the planning, designing and upkeep is the problem. -- Rick C
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-02-21 12:39 -0800 |
| Message-ID | <qt8pacd038hovko1m4r34st5ogul6phfv5@4ax.com> |
| In reply to | #448111 |
On Fri, 17 Feb 2017 21:05:27 -0600, "Tim Williams" <tiwill@seventransistorlabs.com> wrote: >"John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message >news:8vmeac9irgvsf06trp48fgddp7veksta7r@4ax.com... >> Most everybody has good parts and buggy parts. I want to start a web >> site about IC bugs, sort of an Angie's List of semiconductors. > >Do it. Have one of those script kiddies in your basement* write one over >the weekend. Stick ads on it, it'll pay for itself! > >(*I know, they moved out, and you moved out too for that matter. Just >making reference to that.) * They had to find real jobs. They returned what money that was left, to the investors. I thought that was good. We are just at the start of moving the company, working with architects and contractors and electricians. It's going to take a while. It's going to be fun, eventually. https://dl.dropboxusercontent.com/u/53724080/SF/650P/650_Potrero_Photo_WEB.jpg This was a family furniture business, and everybody was ready to retire. We were bidding against Uber, who had more money, but the Marco brothers wanted to lease to a San Francisco family business, so we got it. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-02-21 22:54 -0600 |
| Message-ID | <o8j5ea$m6l$1@dont-email.me> |
| In reply to | #448679 |
"John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message news:qt8pacd038hovko1m4r34st5ogul6phfv5@4ax.com... > https://dl.dropboxusercontent.com/u/53724080/SF/650P/650_Potrero_Photo_WEB.jpg > > This was a family furniture business, and everybody was ready to > retire. We were bidding against Uber, who had more money, but the > Marco brothers wanted to lease to a San Francisco family business, so > we got it. > Swanky. Put the PnP machine in one window, and bottles of wine in the other. Add outdoor chairs, and a table with an umbrella. "Risetimes under 20 picoseconds or the pizza's free!" Just be careful you don't tell the health inspector which oven you're putting the pizzas into. ;-) Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
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| From | krw@notreal.com |
|---|---|
| Date | 2017-02-17 20:33 -0500 |
| Message-ID | <kr8facps66hi0ro9dvcgoge9ggl7n9e60j@4ax.com> |
| In reply to | #448002 |
On Fri, 17 Feb 2017 06:58:17 -0800, Joerg <news@analogconsultants.com> wrote: >On 2017-02-16 21:22, Reinhardt Behm wrote: >> AT Thursday 16 February 2017 23:14, Joerg wrote: >> >>> On 2017-02-15 14:49, Reinhardt Behm wrote: >>>> AT Wednesday 15 February 2017 23:53, Joerg wrote: >>>> >>>>> On 2017-02-14 19:55, Reinhardt Behm wrote: > >[...] > >>>>> >>>>>> I had the same with a part from Microchip. It has a config bit to >>>>>> automatically reset its I2C interface after a timeout period without >>>>>> any activity on the bus. This bit is reset after power on. So if the >>>>>> interface goes gaga because of a poor POR you never get it working. >>>>>> >>>>> >>>>> Oh-oh. Sounds like they built in a loose cannon for a sledgehammer. >>>>> However, a poor POR is something the circuit designer should take care >>>>> of. Never trust any on-chip POR/BOR. Ever. >>>> >>>> Good advice if the chip has no reset pin. :-( >>>> >>> >>> I've had designs where it was like your case and then my reset pin was >>> introduced by means of a P-channel in the VCC line. However, than meant >>> that the data lines had to be muxed and shut off as well or the chip >>> could be supplied through its diode paths. >>> >>> Only at the client's insistence. I prefer stuff that is more reliable. >>> In this case, for example, the LM35. Unfortunely that one needs a >>> negative supply if low temperatures have to be measured. >> >> I have already drawn my conclusions: Microchip is out. >> It was the same as with a DC/DC manufacturer. After the first heavy fail >> their sales called and I told him to come back when they have learned how to >> design. Never heard of him, maybe they have not yet learned it. >> > >I have had quite good experience with Microchip. Opamps, even some LDO >voltage regulators which were surprisingly stable (on the client's >insistence since I never use LDO). The sales rep just told me they're shipping me something like ten reels of opamp samples (singles and quads in three power/noise tradeoffs). They were tired of sampling cut tapes, I guess. ;-) Really nice opamps at an excellent price. ADI and TI say they want the business but won't come close on price. Now that they own Atmel, I do a lot of business with them.
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-18 07:37 -0800 |
| Message-ID | <egr81eFp05jU2@mid.individual.net> |
| In reply to | #448098 |
On 2017-02-17 17:33, krw@notreal.com wrote: > On Fri, 17 Feb 2017 06:58:17 -0800, Joerg <news@analogconsultants.com> > wrote: > >> On 2017-02-16 21:22, Reinhardt Behm wrote: >>> AT Thursday 16 February 2017 23:14, Joerg wrote: >>> >>>> On 2017-02-15 14:49, Reinhardt Behm wrote: >>>>> AT Wednesday 15 February 2017 23:53, Joerg wrote: >>>>> >>>>>> On 2017-02-14 19:55, Reinhardt Behm wrote: >> >> [...] >> >>>>>> >>>>>>> I had the same with a part from Microchip. It has a config bit to >>>>>>> automatically reset its I2C interface after a timeout period without >>>>>>> any activity on the bus. This bit is reset after power on. So if the >>>>>>> interface goes gaga because of a poor POR you never get it working. >>>>>>> >>>>>> >>>>>> Oh-oh. Sounds like they built in a loose cannon for a sledgehammer. >>>>>> However, a poor POR is something the circuit designer should take care >>>>>> of. Never trust any on-chip POR/BOR. Ever. >>>>> >>>>> Good advice if the chip has no reset pin. :-( >>>>> >>>> >>>> I've had designs where it was like your case and then my reset pin was >>>> introduced by means of a P-channel in the VCC line. However, than meant >>>> that the data lines had to be muxed and shut off as well or the chip >>>> could be supplied through its diode paths. >>>> >>>> Only at the client's insistence. I prefer stuff that is more reliable. >>>> In this case, for example, the LM35. Unfortunely that one needs a >>>> negative supply if low temperatures have to be measured. >>> >>> I have already drawn my conclusions: Microchip is out. >>> It was the same as with a DC/DC manufacturer. After the first heavy fail >>> their sales called and I told him to come back when they have learned how to >>> design. Never heard of him, maybe they have not yet learned it. >>> >> >> I have had quite good experience with Microchip. Opamps, even some LDO >> voltage regulators which were surprisingly stable (on the client's >> insistence since I never use LDO). > > The sales rep just told me they're shipping me something like ten > reels of opamp samples (singles and quads in three power/noise > tradeoffs). They were tired of sampling cut tapes, I guess. ;-) > Really nice opamps at an excellent price. ADI and TI say they want > the business but won't come close on price. Now that they own Atmel, > I do a lot of business with them. > With all this consolidation going on I sure hope we'll see some fresh players barging into the market. Else it's going to be like with the airlines or the old Missy Bells who almost got their monopoly back. Choices go down, prices go up. With switcher chips and similar things I am seeing Chinese companies showing up, and not with copied designs but their own. I hope our semiconductor players see that. -- Regards, Joerg http://www.analogconsultants.com/
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| From | dagmargoodboat@yahoo.com |
|---|---|
| Date | 2017-02-22 15:45 -0800 |
| Message-ID | <004c4a1f-ecc9-422d-a982-ce163d9224a2@googlegroups.com> |
| In reply to | #448002 |
On Friday, February 17, 2017 at 9:58:12 AM UTC-5, Joerg wrote: > On 2017-02-16 21:22, Reinhardt Behm wrote: > > AT Thursday 16 February 2017 23:14, Joerg wrote: > > > >> On 2017-02-15 14:49, Reinhardt Behm wrote: > >>> AT Wednesday 15 February 2017 23:53, Joerg wrote: > >>> > >>>> On 2017-02-14 19:55, Reinhardt Behm wrote: > > [...] > > >>>> > >>>>> I had the same with a part from Microchip. It has a config bit to > >>>>> automatically reset its I2C interface after a timeout period without > >>>>> any activity on the bus. This bit is reset after power on. So if the > >>>>> interface goes gaga because of a poor POR you never get it working. > >>>>> > >>>> > >>>> Oh-oh. Sounds like they built in a loose cannon for a sledgehammer. > >>>> However, a poor POR is something the circuit designer should take care > >>>> of. Never trust any on-chip POR/BOR. Ever. > >>> > >>> Good advice if the chip has no reset pin. :-( > >>> > >> > >> I've had designs where it was like your case and then my reset pin was > >> introduced by means of a P-channel in the VCC line. However, than meant > >> that the data lines had to be muxed and shut off as well or the chip > >> could be supplied through its diode paths. > >> > >> Only at the client's insistence. I prefer stuff that is more reliable. > >> In this case, for example, the LM35. Unfortunely that one needs a > >> negative supply if low temperatures have to be measured. > > > > I have already drawn my conclusions: Microchip is out. > > It was the same as with a DC/DC manufacturer. After the first heavy fail > > their sales called and I told him to come back when they have learned how to > > design. Never heard of him, maybe they have not yet learned it. > > > > I have had quite good experience with Microchip. Opamps, even some LDO > voltage regulators which were surprisingly stable (on the client's > insistence since I never use LDO). > > -- > Regards, Joerg > > http://www.analogconsultants.com/ I just used some Microchip op amps--no complaints. And a quad i2c DAC. Nice stuff, actually. AIUI you can clear nearly all the i2c deadlocks by having the master cycle the clock 9 times (or by just cycling the power :). Cheers, James Arthur
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-23 10:43 -0800 |
| Message-ID | <eh8oq2Fgp7rU1@mid.individual.net> |
| In reply to | #448904 |
On 2017-02-22 15:45, dagmargoodboat@yahoo.com wrote: [...] > > AIUI you can clear nearly all the i2c deadlocks by having the master > cycle the clock 9 times (or by just cycling the power :). > Thing is, my clients typically do not want to hear the word "nearly" :-) A vendor wanted to convince a client to adopt press-fit for motherboards. Something I never liked and where I have seen failures. Big meeting. Went like this: "We guarantee 99.9% contact reliability on DIN connectors" ... a certain consultant raises hand ... "Sir, our motherboard has lots of DIN connectors and the pin number totals 3,456. According to your statement three to four of those could fail to connect reliably. Could you tell us which ones those would be?" The meeting sort of ended. -- Regards, Joerg http://www.analogconsultants.com/
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| From | krw@notreal.com |
|---|---|
| Date | 2017-02-23 20:42 -0500 |
| Message-ID | <6i3vaclt01f1ff9jftsuj2l0ds1nn3phjs@4ax.com> |
| In reply to | #448963 |
On Thu, 23 Feb 2017 10:43:23 -0800, Joerg <news@analogconsultants.com> wrote: >On 2017-02-22 15:45, dagmargoodboat@yahoo.com wrote: > >[...] > >> >> AIUI you can clear nearly all the i2c deadlocks by having the master >> cycle the clock 9 times (or by just cycling the power :). >> > >Thing is, my clients typically do not want to hear the word "nearly" :-) It's a design thing. If this works on a part, it will always work. (nearly ;-) >A vendor wanted to convince a client to adopt press-fit for >motherboards. Something I never liked and where I have seen failures. >Big meeting. Went like this: > >"We guarantee 99.9% contact reliability on DIN connectors" ... a certain >consultant raises hand ... "Sir, our motherboard has lots of DIN >connectors and the pin number totals 3,456. According to your statement >three to four of those could fail to connect reliably. Could you tell us >which ones those would be?" > >The meeting sort of ended. I was in one of those mettings when I worked in P'ok IBM. There was a problem that caused magic smoke to roll out of mainframes (customers were not happy). A VP demanded that after the fix it was impossible for this to happen again. Someone raised the point that never was a long time and nothing is perfect. The VP then said "OK, you can have _one_ failure, BUT IT HAD BETTER BE ON ONE OF OUR SYSTEMS!".
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| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-02-24 03:31 -0600 |
| Message-ID | <o8oueb$8ec$1@dont-email.me> |
| In reply to | #448963 |
"Joerg" <news@analogconsultants.com> wrote in message news:eh8oq2Fgp7rU1@mid.individual.net... > "We guarantee 99.9% contact reliability on DIN connectors" ... a certain > consultant raises hand ... "Sir, our motherboard has lots of DIN > connectors and the pin number totals 3,456. According to your statement > three to four of those could fail to connect reliably. Could you tell us > which ones those would be?" > > The meeting sort of ended. I remember you'd told that one before... ;) They're used pretty often in server gear (at least, the economically-vintage hardware I've seen torn down: < 5 years age, 1/4" thick, 32 layer PCBs, you know, that sort of thing...). Those have at least as many pins, probably more inside the whole box. Were they just a particularly shit supplier, or what? :-) Also DIN connectors, but nevermind that? Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com
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| From | grahamholloway@graham65.plus.com |
|---|---|
| Date | 2017-02-24 06:39 -0800 |
| Message-ID | <e34d698d-d953-45bc-9896-dad500aab9b9@googlegroups.com> |
| In reply to | #449016 |
On Friday, 24 February 2017 09:31:45 UTC, Tim Williams wrote: > "Joerg" <news@analogconsultants.com> wrote in message > news:eh8oq2Fgp7rU1@mid.individual.net... > > "We guarantee 99.9% contact reliability on DIN connectors" ... a certain > > consultant raises hand ... "Sir, our motherboard has lots of DIN > > connectors and the pin number totals 3,456. According to your statement > > three to four of those could fail to connect reliably. Could you tell us > > which ones those would be?" > > > > The meeting sort of ended. > > Oh Dear! Press-Fit 5 row DINs are used in flight control systems on Boeing 777s and some Airbuses. It's a good job that they have a certain level of redundancy. GH
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| From | Don Kuenz <g@crcomp.net> |
|---|---|
| Date | 2017-02-24 14:58 +0000 |
| Message-ID | <20170224b@crcomp.net> |
| In reply to | #449016 |
Tim Williams <tiwill@seventransistorlabs.com> wrote: > "Joerg" <news@analogconsultants.com> wrote in message > news:eh8oq2Fgp7rU1@mid.individual.net... >> "We guarantee 99.9% contact reliability on DIN connectors" ... a certain >> consultant raises hand ... "Sir, our motherboard has lots of DIN >> connectors and the pin number totals 3,456. According to your statement >> three to four of those could fail to connect reliably. Could you tell us >> which ones those would be?" >> >> The meeting sort of ended. > > I remember you'd told that one before... ;) > > They're used pretty often in server gear (at least, the economically-vintage > hardware I've seen torn down: < 5 years age, 1/4" thick, 32 layer PCBs, you > know, that sort of thing...). Those have at least as many pins, probably > more inside the whole box. > > Were they just a particularly shit supplier, or what? :-) > > Also DIN connectors, but nevermind that? This thread gives me deja vu. My keyboard, synthesizer, and Edirol DIN-5 to USB adapter all use DIN-5. "Don't shoot me, I'm only the piano player." Thank you, -- Don Kuenz KB7RPU
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-25 12:48 -0800 |
| Message-ID | <ehe8srFk2ehU3@mid.individual.net> |
| In reply to | #449016 |
On 2017-02-24 01:31, Tim Williams wrote: > "Joerg" <news@analogconsultants.com> wrote in message > news:eh8oq2Fgp7rU1@mid.individual.net... >> "We guarantee 99.9% contact reliability on DIN connectors" ... a certain >> consultant raises hand ... "Sir, our motherboard has lots of DIN >> connectors and the pin number totals 3,456. According to your >> statement three to four of those could fail to connect reliably. Could >> you tell us >> which ones those would be?" >> >> The meeting sort of ended. > > I remember you'd told that one before... ;) > > They're used pretty often in server gear (at least, the > economically-vintage hardware I've seen torn down: < 5 years age, 1/4" > thick, 32 layer PCBs, you know, that sort of thing...). Those have at > least as many pins, probably more inside the whole box. > We has some machines that had a lot more slots and probably close to 10,000 pins. > Were they just a particularly shit supplier, or what? :-) > > Also DIN connectors, but nevermind that? > Those 96-pin ones in large card cages. That's what we always called them. -- Regards, Joerg http://www.analogconsultants.com/
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-02-26 04:39 -0800 |
| Message-ID | <d246ea6c-92af-4a62-8207-4cefc479ec68@googlegroups.com> |
| In reply to | #449220 |
>Those 96-pin ones in large card cages. That's what we always called them. Eurocard/VME connectors, IOW. Cheers Phil Hobbs
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-02-26 07:52 -0800 |
| Message-ID | <ehgbtjF211tU1@mid.individual.net> |
| In reply to | #449294 |
On 2017-02-26 04:39, pcdhobbs@gmail.com wrote: >> Those 96-pin ones in large card cages. That's what we always called them. > > Eurocard/VME connectors, IOW. > We did often call the boxes VME boxes but for some reason never the connectors. I still have two nice single-height Euro boxes for ham radio projects from decades ago. Never really used them, the way how it often goes. -- Regards, Joerg http://www.analogconsultants.com/
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