1-wire specification
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From: Mark Zenier on 14 Jan 2010 15:08 In article <MPG.25b7c5f9e1380d9198ae14(a)news.east.earthlink.net>, WangoTango <Asgard24(a)mindspring.com> wrote: >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? :) I thought that's what I said. " But for the P2, there are two. " Meaning, they have two sections in the MC6805P2 (and 'P4 and 'P6) "Port DC Electrical Characteristics" table of the spec sheet, one for "Port A with CMOS Drive enabled", and one for "Port C and Port A with CMOS Drive Disabled". Giving VOL, VOH, VIL, and VIH under various conditions. The "drive enabled" section matches the '705P3' table in having both the additional "VOH with a 10 uA load" spec, and having the higher IIH spec. Mark Zenier mzenier(a)eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)
From: Jon Kirwan on 15 Jan 2010 14:33
On Thu, 14 Jan 2010 20:08:29 GMT, mzenier(a)eskimo.com (Mark Zenier) wrote: >In article <MPG.25b7c5f9e1380d9198ae14(a)news.east.earthlink.net>, >WangoTango <Asgard24(a)mindspring.com> wrote: >>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? :) > >I thought that's what I said. " But for the P2, there are two. " >Meaning, they have two sections in the MC6805P2 (and 'P4 and 'P6) >"Port DC Electrical Characteristics" table of the spec sheet, one >for "Port A with CMOS Drive enabled", and one for "Port C and >Port A with CMOS Drive Disabled". Giving VOL, VOH, VIL, and VIH >under various conditions. The "drive enabled" section matches >the '705P3' table in having both the additional "VOH with a 10 uA load" >spec, and having the higher IIH spec. > >Mark Zenier mzenier(a)eskimo.com >Googleproofaddress(account:mzenier provider:eskimo domain:com) Mark, I think your answer was tight and targeted at the OP's first post well. I think Asgard24's response tried to change the subject, writing "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." That hadn't been the OP's point, but it was a point Asgard24 tried to turn it into for reasons I don't fathom well. You were right to write as you did. It was on point and nicely said. Jon |