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Add PrtSc to the numpad, filling the nav block

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Between Del and PgDn, which makes the nav block a solid 3x2 and leaves the
arrows isolated by a symmetric pair of gaps rather than three asymmetric ones.
26 keys. PrtSc earns a key because it is the screenshot key on every Linux
desktop; Insert, ScrLk and Pause stay on a layer.

Co-Authored-By: Claude Opus 5 <[email protected]>
This commit is contained in:
William RickertandClaude Opus 5 committed 2026-09-01 10:35:24 -05:00
1 parent 81abd43fdc
commit 04a52b1eea
3 files changed
+16 -12
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Documents/bom.csv
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@@ -23,7 +23,7 @@ HALF-L/R,Split,D-ESD,1,ESD 5V bidirectional,PESD5V0S1BA,C2827694,SOD-323,Extende
HALF-L/R,Split,J3,1,3-pin header DNF,JST SH,-,-,Consigned,0.02,"*** DNF INSURANCE *** VCC/GND/DATA fallback if SBU proves flaky (bad cables). 3 pads cost nothing"
HALF-L/R,Split,-,-,SBU1+SBU2 TIE,-,-,-,-,0.00,"Tie A8 and B8 together on the board. SBU is CROSSED in the cable, so this makes it orientation-proof and doubles the conductor"
NUMPAD,DNF,J1/U3/R3/R4/R5,0,DO NOT POPULATE,-,-,-,-,0.00,"*** From the ALL block: numpad MCU has NO connector of its own. Its D+/D- route internally to hub downstream port 1. No connector = no ESD part and no CC resistors needed. Saves ~$0.19"
NUMPAD,Matrix,D1-D25,25,1N4148W,1N4148W,C81598,SOD-123,Basic,0.011,"25 keys: 14 numpad + 9 nav + 2 thumb (Enter 2u, +). No Num key"
NUMPAD,Matrix,D1-D26,26,1N4148W,1N4148W,C81598,SOD-123,Basic,0.011,"26 keys: 14 numpad + 10 nav (incl. PrtSc) + 2 thumb (Enter 2u, +). No Num key"
NUMPAD,Hub,U4,1,USB2.0 4-port hub,CH334R,C4154405,QSOP-16-150mil,Extended,0.50,"Ports: 1=own MCU (internal FS) 2=left half 3=right half 4=spare"
NUMPAD,Hub,Y2,1,12MHz crystal,X322512MSB4SI,C9002,SMD3225-4P,Basic,0.101,"CH334 has built-in load caps - verify internal value vs this 20pF CL crystal; fit DNF cap pads"
NUMPAD,Hub,C12-C14,3,100nF 0402,CL05B104KO5NNNC,C1525,0402,Basic,0.006,"hub decoupling"
@@ -37,6 +37,6 @@ NUMPAD,SBU,-,-,SBU PASS-THROUGH,-,-,-,-,0.00,"*** Passive trace *** Tie SBU1+SBU
NUMPAD,SBU,D-ESD2,2,ESD 5V bidirectional,PESD5V0S1BA,C2827694,SOD-323,Extended,0.036,"One per half-port SBU net"
HALF-L,Switches,SW-,34,MX hotswap socket,CPG151101S11,C41430893,SMD 14.5x5.9mm,Extended,0.037,"BOTTOM SIDE. Alt: C49352235"
HALF-R,Switches,SW-,41,MX hotswap socket,CPG151101S11,C41430893,SMD 14.5x5.9mm,Extended,0.037,"BOTTOM SIDE. Alt: C49352235"
NUMPAD,Switches,SW-,25,MX hotswap socket,CPG151101S11,C41430893,SMD 14.5x5.9mm,Extended,0.037,"One per key. BOTTOM SIDE"
NUMPAD,Switches,SW-,26,MX hotswap socket,CPG151101S11,C41430893,SMD 14.5x5.9mm,Extended,0.037,"One per key. BOTTOM SIDE"
NOTE,Assembly,-,-,SINGLE-SIDED,-,-,-,-,-,"Put ALL SMD on the BOTTOM: sockets, MCU, passives, diodes, and any reverse-mount SK6812MINI-E. Top face bare except switch holes. Keeps JLC to one assembly pass"
NOTE,Mechanical,-,-,PLATE REQUIRED,-,-,-,-,-,"Hotswap needs a switch plate or socket pads tear off during switch insertion. FR4 plate = just another JLC board"
1 Board Section Ref Qty Value MPN LCSC Package JLC Unit USD Notes
23 HALF-L/R Split J3 1 3-pin header DNF JST SH - - Consigned 0.02 *** DNF INSURANCE *** VCC/GND/DATA fallback if SBU proves flaky (bad cables). 3 pads cost nothing
24 HALF-L/R Split - - SBU1+SBU2 TIE - - - - 0.00 Tie A8 and B8 together on the board. SBU is CROSSED in the cable, so this makes it orientation-proof and doubles the conductor
25 NUMPAD DNF J1/U3/R3/R4/R5 0 DO NOT POPULATE - - - - 0.00 *** From the ALL block: numpad MCU has NO connector of its own. Its D+/D- route internally to hub downstream port 1. No connector = no ESD part and no CC resistors needed. Saves ~$0.19
26 NUMPAD Matrix D1-D25 D1-D26 25 26 1N4148W 1N4148W C81598 SOD-123 Basic 0.011 25 keys: 14 numpad + 9 nav + 2 thumb (Enter 2u, +). No Num key 26 keys: 14 numpad + 10 nav (incl. PrtSc) + 2 thumb (Enter 2u, +). No Num key
27 NUMPAD Hub U4 1 USB2.0 4-port hub CH334R C4154405 QSOP-16-150mil Extended 0.50 Ports: 1=own MCU (internal FS) 2=left half 3=right half 4=spare
28 NUMPAD Hub Y2 1 12MHz crystal X322512MSB4SI C9002 SMD3225-4P Basic 0.101 CH334 has built-in load caps - verify internal value vs this 20pF CL crystal; fit DNF cap pads
29 NUMPAD Hub C12-C14 3 100nF 0402 CL05B104KO5NNNC C1525 0402 Basic 0.006 hub decoupling
37 NUMPAD SBU D-ESD2 2 ESD 5V bidirectional PESD5V0S1BA C2827694 SOD-323 Extended 0.036 One per half-port SBU net
38 HALF-L Switches SW- 34 MX hotswap socket CPG151101S11 C41430893 SMD 14.5x5.9mm Extended 0.037 BOTTOM SIDE. Alt: C49352235
39 HALF-R Switches SW- 41 MX hotswap socket CPG151101S11 C41430893 SMD 14.5x5.9mm Extended 0.037 BOTTOM SIDE. Alt: C49352235
40 NUMPAD Switches SW- 25 26 MX hotswap socket CPG151101S11 C41430893 SMD 14.5x5.9mm Extended 0.037 One per key. BOTTOM SIDE
41 NOTE Assembly - - SINGLE-SIDED - - - - - Put ALL SMD on the BOTTOM: sockets, MCU, passives, diodes, and any reverse-mount SK6812MINI-E. Top face bare except switch holes. Keeps JLC to one assembly pass
42 NOTE Mechanical - - PLATE REQUIRED - - - - - Hotswap needs a switch plate or socket pads tear off during switch insertion. FR4 plate = just another JLC board