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annotate pirelli/pcb @ 56:fdfb57a1c5fe

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Pirelli PCB tracing: voice band i/f, MCSI and MODEM UART
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 20 Oct 2013 04:49:28 +0000
parents 8e4dac492552
children
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b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 The Pirelli DP-L10 PCB appears to have 8 layers. Following the good old DEC
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 convention, I shall refer to them as L1 through L8. Not knowing the original
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 designers' intended identification, I have arbitrarily assigned L1 to be the
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 battery/SIM side and L8 to be the display/keypad side. This numbering direction
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 makes it easier to work with steve-m's grind-down pictures.
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 Via structure: there don't seem to be too many all-the-way-through vias, if
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 any at all, other than maybe the grounding ones around the edges of the board.
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9 Instead most/all internal vias are blind, spanning from L2 through L7.
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 At both surfaces there are micro-vias (with many/most of them one can't even
54
8e4dac492552 another Pirelli PCB tracing session, focusing on the display subsystem
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 10
diff changeset
11 see the hole in steve-m's pictures, only a copper circle which one has to
10
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 infer is an "annulus" for a micro-via), and these micro-vias only go one layer
b0f7481efc8b Pirelli PCB rev eng: finally have something worthy to report:
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13 deep: from L1 to L2, and from L8 to L7.