1-wire specification
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From: Robert Baer on 12 Jan 2010 03:59 WangoTango wrote: > In article <jmtmk59k4quv15uoqtm9lv4h7s4mj59r43(a)4ax.com>, To-Email-Use- > The-Envelope-Icon(a)My-Web-Site.com/Snicker says... >>> Who writes app notes? Certainly no one who knows what they are doing. >> At Motorola it was a department separate from the design groups :-( >> >> I was constantly at clash with those idiots. >> >> > I still remember the convoluted spec on the NMOS MC68705P3S port A. > I went something like this : > > "The PORT A pull up option, available on the masked part, is not > optional on the ceramic (CS) part" > > OK, does that mean it is always in place, or not available? > When I called the regional FAE he didn't know either. > I interpret that as a direct implication of NO pullup.
From: WangoTango on 12 Jan 2010 11:49 In article <BfCdnY9cqqXupNHWnZ2dnUVZ_tRi4p2d(a)posted.localnet>, robertbaer(a)localnet.com says... > WangoTango wrote: > > In article <jmtmk59k4quv15uoqtm9lv4h7s4mj59r43(a)4ax.com>, To-Email-Use- > > The-Envelope-Icon(a)My-Web-Site.com/Snicker says... > >>> Who writes app notes? Certainly no one who knows what they are doing. > >> At Motorola it was a department separate from the design groups :-( > >> > >> I was constantly at clash with those idiots. > >> > >> > > I still remember the convoluted spec on the NMOS MC68705P3S port A. > > I went something like this : > > > > "The PORT A pull up option, available on the masked part, is not > > optional on the ceramic (CS) part" > > > > OK, does that mean it is always in place, or not available? > > When I called the regional FAE he didn't know either. > > > I interpret that as a direct implication of NO pullup. > I did too, but it could have been a lot more clearly stated. It was simple enough to test for, but I expect a bit more clarity when it comes to spec sheets. A non-optional option could be construed to mean it is a mandatory addition. Something along the lines of "The PORT A pull up is not available on the ceramic (CS) part." TADA.....
From: Robert Baer on 13 Jan 2010 05:00 WangoTango wrote: > In article <BfCdnY9cqqXupNHWnZ2dnUVZ_tRi4p2d(a)posted.localnet>, > robertbaer(a)localnet.com says... >> WangoTango wrote: >>> In article <jmtmk59k4quv15uoqtm9lv4h7s4mj59r43(a)4ax.com>, To-Email-Use- >>> The-Envelope-Icon(a)My-Web-Site.com/Snicker says... >>>>> Who writes app notes? Certainly no one who knows what they are doing. >>>> At Motorola it was a department separate from the design groups :-( >>>> >>>> I was constantly at clash with those idiots. >>>> >>>> >>> I still remember the convoluted spec on the NMOS MC68705P3S port A. >>> I went something like this : >>> >>> "The PORT A pull up option, available on the masked part, is not >>> optional on the ceramic (CS) part" >>> >>> OK, does that mean it is always in place, or not available? >>> When I called the regional FAE he didn't know either. >>> >> I interpret that as a direct implication of NO pullup. >> > I did too, but it could have been a lot more clearly stated. > It was simple enough to test for, but I expect a bit more clarity when > it comes to spec sheets. > A non-optional option could be construed to mean it is a mandatory > addition. > Something along the lines of "The PORT A pull up is not available on the > ceramic (CS) part." TADA..... > ...but....but........that is toooo symple!
From: Mark Zenier on 12 Jan 2010 16:55 In article <MPG.25b54940d2df79b098ae01(a)news.east.earthlink.net>, WangoTango <Asgard24(a)mindspring.com> wrote: .... >I still remember the convoluted spec on the NMOS MC68705P3S port A. >I went something like this : > >"The PORT A pull up option, available on the masked part, is not >optional on the ceramic (CS) part" > >OK, does that mean it is always in place, or not available? >When I called the regional FAE he didn't know either. Should be buried in the spec sheet somewhere. Dig, dig, dig ... ADI-1031, October, 1984. Compare the 6805P2 and 68705P3 "Port DC Characteristics" pages in the back. There's only one section for the 705P3 Port A characteristics. But for the P2, there are two. So find the one that's the best match. "Iih" for Port A in the 705P3 matched the characteristics of "Iih" for port A on the the P2 "with CMOS Drive Enabled". So, always enabled. Took me about 5 minutes to answer a question that's 25 years obselete. ;-) Mark Zenier mzenier(a)eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)
From: WangoTango on 13 Jan 2010 11:59
In article <hiksuv0he1(a)enews6.newsguy.com>, mzenier(a)eskimo.com says... > In article <MPG.25b54940d2df79b098ae01(a)news.east.earthlink.net>, > WangoTango <Asgard24(a)mindspring.com> wrote: > ... > >I still remember the convoluted spec on the NMOS MC68705P3S port A. > >I went something like this : > > > >"The PORT A pull up option, available on the masked part, is not > >optional on the ceramic (CS) part" > > > >OK, does that mean it is always in place, or not available? > >When I called the regional FAE he didn't know either. > > Should be buried in the spec sheet somewhere. Dig, dig, dig ... > ADI-1031, October, 1984. > > Compare the 6805P2 and 68705P3 "Port DC Characteristics" pages in the > back. There's only one section for the 705P3 Port A characteristics. > But for the P2, there are two. So find the one that's the best match. > "Iih" for Port A in the 705P3 matched the characteristics of "Iih" > for port A on the the P2 "with CMOS Drive Enabled". So, always enabled. > > Took me about 5 minutes to answer a question that's 25 years obselete. ;-) > > Mark Zenier mzenier(a)eskimo.com > Googleproofaddress(account:mzenier provider:eskimo domain:com) The point was that there should be a bit more clarity to begin with, not that the question couldn't be answered with some digging. And, shouldn't there be TWO listing for PORTA also? One for the masked part when the customer opts for the optional option and one for when they don't? :) |