Updated for available parts

.gitignore

@@ -0,0 +1,2 @@
+
+pcb/3w6/3W6-backups/*

README.md

@@ -12,6 +12,14 @@ So no hotswap, no multiple switchtypes, no encoders, no LEDs.
 
 BUT with onboard controllers (so no extra ProMicros, Elite-C), production files including SMT assembly files, and sturdy through hole mounted USB-C connectors.
 
+## revision 3
+changes:
+- added second ground plane and stitching vias
+- accidentally removed mounting holes to support tenting puck from splitkb.com
+- package for the MCU was changed back to QFN44, since the previous one wasn't available
+- added ISP header to program MCU for models without factory bootloader
+- IO-expander was changed to TCA9535PWR alongside with adding external pull-up resistors to increase compatible part selection
+
 ## revision 2
 changes:
 - new middle plate (1.6mm, better 2.0mm) instead of diodes. Uses Aluminium PCBs as a cheaper alternative to lasered aluminium. 

pcb/3w6/3W6-cache.lib

@@ -1,6 +1,56 @@
 EESchema-LIBRARY Version 2.4
 #encoding utf-8
 #
+# 3W6-rescue_Trackball_Choc_Combi-weteor
+#
+DEF 3W6-rescue_Trackball_Choc_Combi-weteor SW 0 40 Y Y 2 L N
+F0 "SW" 600 550 50 H V C CNN
+F1 "3W6-rescue_Trackball_Choc_Combi-weteor" 50 500 50 H V C CNN
+F2 "" 0 350 50 H I C CNN
+F3 "" 0 350 50 H I C CNN
+DRAW
+C -80 0 20 1 1 0 N
+C 80 0 20 1 1 0 N
+S -200 250 200 -250 2 1 10 f
+P 2 1 1 0 0 50 0 120 N
+P 2 1 1 0 100 50 -100 50 N
+X 1 1 -200 0 100 R 50 50 1 1 P
+X 2 2 200 0 100 L 50 50 1 1 P
+X GND GND -300 -150 100 R 50 50 2 1 W
+X INT INT 300 -150 100 L 50 50 2 1 O
+X SCL SCL 300 50 100 L 50 50 2 1 B
+X SDA SDA 300 150 100 L 50 50 2 1 B
+X VCC VCC -300 150 100 R 50 50 2 1 W
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_02x03_Odd_Even
+#
+DEF Connector_Generic_Conn_02x03_Odd_Even J 0 40 Y N 1 F N
+F0 "J" 50 200 50 H V C CNN
+F1 "Connector_Generic_Conn_02x03_Odd_Even" 50 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_2x??_*
+$ENDFPLIST
+DRAW
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 150 150 -150 1 1 10 f
+S 150 -95 100 -105 1 1 6 N
+S 150 5 100 -5 1 1 6 N
+S 150 105 100 95 1 1 6 N
+X Pin_1 1 -200 100 150 R 50 50 1 1 P
+X Pin_2 2 300 100 150 L 50 50 1 1 P
+X Pin_3 3 -200 0 150 R 50 50 1 1 P
+X Pin_4 4 300 0 150 L 50 50 1 1 P
+X Pin_5 5 -200 -100 150 R 50 50 1 1 P
+X Pin_6 6 300 -100 150 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # Connector_USB_C_Receptacle_USB2.0
 #
 DEF Connector_USB_C_Receptacle_USB2.0 J 0 40 Y Y 1 F N
@@ -198,16 +248,16 @@ X IO0_5 9 500 300 100 L 50 50 1 1 B
 ENDDRAW
 ENDDEF
 #
-# MCU_Microchip_ATmega_ATmega32U4-AU
+# MCU_Microchip_ATmega_ATmega32U4-MU
 #
-DEF MCU_Microchip_ATmega_ATmega32U4-AU U 0 20 Y Y 1 F N
+DEF MCU_Microchip_ATmega_ATmega32U4-MU U 0 20 Y Y 1 F N
 F0 "U" -500 1750 50 H V L BNN
-F1 "MCU_Microchip_ATmega_ATmega32U4-AU" 100 -1750 50 H V L TNN
-F2 "Package_QFP:TQFP-44_10x10mm_P0.8mm" 0 0 50 H I C CIN
+F1 "MCU_Microchip_ATmega_ATmega32U4-MU" 100 -1750 50 H V L TNN
+F2 "Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm" 0 0 50 H I C CIN
 F3 "" 0 0 50 H I C CNN
-ALIAS ATmega16U4RC-AU ATmega32U4-AU ATmega32U4RC-AU
+ALIAS ATmega16U4RC-MU ATmega32U4-MU ATmega32U4RC-MU
 $FPLIST
- TQFP*10x10mm*P0.8mm*
+ QFN*1EP*7x7mm*P0.5mm*
 $ENDFPLIST
 DRAW
 S -500 -1700 500 1700 0 1 10 f
@@ -250,6 +300,7 @@ X PF0 41 600 -900 100 L 50 50 1 1 B
 X AREF 42 -600 900 100 R 50 50 1 1 P
 X GND 43 0 -1800 100 U 50 50 1 1 P N
 X AVCC 44 100 1800 100 D 50 50 1 1 P N
+X GND 45 0 -1800 100 U 50 50 1 1 P N
 X UGND 5 -100 -1800 100 U 50 50 1 1 P
 X UCAP 6 -600 200 100 R 50 50 1 1 P
 X VBUS 7 -600 700 100 R 50 50 1 1 I
@@ -345,27 +396,4 @@ X VSS 1 0 0 0 U 50 50 1 1 W N
 ENDDRAW
 ENDDEF
 #
-# weteor_Trackball_Choc_Combi
-#
-DEF weteor_Trackball_Choc_Combi SW 0 40 Y Y 2 L N
-F0 "SW" 600 550 50 H V C CNN
-F1 "weteor_Trackball_Choc_Combi" 50 500 50 H V C CNN
-F2 "" 0 350 50 H I C CNN
-F3 "" 0 350 50 H I C CNN
-DRAW
-C -80 0 20 1 1 0 N
-C 80 0 20 1 1 0 N
-S -200 250 200 -250 2 1 10 f
-P 2 1 1 0 0 50 0 120 N
-P 2 1 1 0 100 50 -100 50 N
-X 1 1 -200 0 100 R 50 50 1 1 P
-X 2 2 200 0 100 L 50 50 1 1 P
-X GND GND -300 -150 100 R 50 50 2 1 W
-X INT INT 300 -150 100 L 50 50 2 1 O
-X SCL SCL 300 50 100 L 50 50 2 1 B
-X SDA SDA 300 150 100 L 50 50 2 1 B
-X VCC VCC -300 150 100 R 50 50 2 1 W
-ENDDRAW
-ENDDEF
-#
 #End Library

pcb/3w6/3W6-rescue.dcm

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0
+#
+#End Doc Library

pcb/3w6/3W6-rescue.lib

@@ -0,0 +1,27 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Trackball_Choc_Combi-weteor
+#
+DEF Trackball_Choc_Combi-weteor SW 0 40 Y Y 2 L N
+F0 "SW" 600 550 50 H V C CNN
+F1 "Trackball_Choc_Combi-weteor" 50 500 50 H V C CNN
+F2 "" 0 350 50 H I C CNN
+F3 "" 0 350 50 H I C CNN
+DRAW
+C -80 0 20 1 1 0 N
+C 80 0 20 1 1 0 N
+S -200 250 200 -250 2 1 10 f
+P 2 1 1 0 0 50 0 120 N
+P 2 1 1 0 100 50 -100 50 N
+X 1 1 -200 0 100 R 50 50 1 1 P
+X 2 2 200 0 100 L 50 50 1 1 P
+X GND GND -300 -150 100 R 50 50 2 1 W
+X INT INT 300 -150 100 L 50 50 2 1 O
+X SCL SCL 300 50 100 L 50 50 2 1 B
+X SDA SDA 300 150 100 L 50 50 2 1 B
+X VCC VCC -300 150 100 R 50 50 2 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library