1. 17 Oct, 2020 1 commit
  2. 23 May, 2020 1 commit
  3. 21 May, 2019 1 commit
  4. 22 Sep, 2018 1 commit
  5. 20 Sep, 2018 1 commit
  6. 14 Aug, 2018 1 commit
    • Eric Kuzmenko's avatar
      Make the ENET_* traces on the top layer 53mils in order to ensure they have a... · 2456bfb3
      Eric Kuzmenko authored
      Make the ENET_* traces on the top layer 53mils in order to ensure they have a 50Ohm single-ended impedence, move one of the 5V_P bypass caps close to the SoM end of the USB2 diff pair, add meanders to the ENET_TXC, ENET_TX_CTL, ENET_RX_CTL in order to ensure these segments are matched to the long ENET_RXC segment (56.051mm, the rest of the RGMII signals are <10mm skew from this length and don't need adjusting, re-route the SIM card such that UIM-RESET is routed in between UIM-CLK and UIM-DATA as recommended by a BB manufacturer
      2456bfb3
  7. 03 Aug, 2018 1 commit
    • Eric Kuzmenko's avatar
      Add pi-matching circuit to the baseband modem antenna's feedline · 2f8fb756
      Eric Kuzmenko authored
      The return path for the antenna may have to have a 6.8nH Murata LQG15HN inductor installed on it (cutting the ground trace shorting the pads). The BoM was updated with the new components and everything was reannotated and updated (page 2's caps were out of order).
      2f8fb756
  8. 23 Jul, 2018 1 commit
  9. 17 Jul, 2018 1 commit
  10. 16 Jul, 2018 1 commit
  11. 09 Jul, 2018 1 commit
  12. 04 Jul, 2018 1 commit
    • Eric Kuzmenko's avatar
      Now using GPIO5_IO03 (P4.03) to put the class-D op-amp in shutdown and... · 3bf0094e
      Eric Kuzmenko authored
      Now using GPIO5_IO03 (P4.03) to put the class-D op-amp in shutdown and conserve energy when muted, make C1716 near the ETH PHY's DVDDL pin 47 220nF instead of 10uF (EmCraft suggested that this should be 100nF but their's is 220nF, asked why), added a 10k pull-down to PAM2841's ENA pin, added a 100nF cap to the smart card's C1 VCC pin, added a 1uF cap to the haptic motor circuit's 3V3_P rail
      
      Still need to use I2C3 instead of I2C1 according to EmCraft's suggestions.
      3bf0094e
  13. 24 Jun, 2018 1 commit
    • Eric Kuzmenko's avatar
      Add proper WWAN reset circuit using a MMBT2222A NPN BJT along with a 100nF cap... · 3b5880ca
      Eric Kuzmenko authored
      Add proper WWAN reset circuit using a MMBT2222A NPN BJT along with a 100nF cap and a TVS diode, make needed adjustements to the WWAN's SIM card circuit (UIM-CLK and UIM-RESET caps are NC & added 4.7k series resistor to SIM_DETECT_O#), assign the MMBT2222A footprint to KiCad's official SOT-23 footprint (identical to the spec sheet's recommended land pattern)
      
      If necessary, the NC cap pads on UIM-CLK and UIM-RESET can be tested with various values during the first prototype debugging phase.
      3b5880ca
  14. 23 Jun, 2018 1 commit
  15. 22 Jun, 2018 1 commit
  16. 20 Jun, 2018 2 commits
  17. 19 Jun, 2018 1 commit
  18. 17 Jun, 2018 2 commits
  19. 15 Jun, 2018 3 commits
  20. 13 Jun, 2018 3 commits
  21. 12 Jun, 2018 1 commit
    • Eric Kuzmenko's avatar
      Add GNSS antenna footprint including correct 50Ohm feed line dimensions and... · 05b25768
      Eric Kuzmenko authored
      Add GNSS antenna footprint including correct 50Ohm feed line dimensions and keepout area, add u-blox MAX-8 3D model, rename all instances of MAX-M8* to MAX-8* due to part selection, antenna feed line calculatos included (coplanar waveguide)
      
      Need to add placeholder footprints for the other four antennae which will be represented as simple rectangular areas where the antennae will occupy. After that, all that is left is to assign the various remaining IC footprints and finally import all footprints into PCBNew & begin layout!
      05b25768
  22. 11 Jun, 2018 3 commits
    • Eric Kuzmenko's avatar
      Create footprint for cap touch FPC connector and assign it, add cap touch FPC... · 96eb7c50
      Eric Kuzmenko authored
      Create footprint for cap touch FPC connector and assign it, add cap touch FPC connector 3D model, assign M.2 Key E socket footprint, assign JTAG header footprint (will be unpopulated)
      
      M.2 footprints will need mounting holes added to them for the modules to be brought close to the baseboard, this may pose a problem with the display mounted on the back and might need to be done a different way (needs evaluation). Cap touch and DSI connectors need to be carefully placed in the layout to make sure they are positioned correctly with respect to the display's FPCs and the outline of the display itself (need dimensions ASAP). JTAG header can be placed on the back of the board with the header unpopulated, will be hidden as it's only intended for intense last resort debugging option.
      96eb7c50
    • Christian Schilmoeller's avatar
      new structure of first page in the schematics · 37c3f7b5
      Christian Schilmoeller authored
      more direct connections instead of labels
      interconnection of schematic blocks (e.g. USB hub) is made visible
      format of page is now A3 instead of A2 -> better font quality when printed on small paper
      37c3f7b5
    • Christian Schilmoeller's avatar
      added company logo and designers email addresses into drawing area · 3d8a3def
      Christian Schilmoeller authored
      new library with symbol of Emcraft-SOM (for later use)
      3d8a3def
  23. 07 Jun, 2018 2 commits
  24. 06 Jun, 2018 2 commits
  25. 04 Jun, 2018 1 commit
    • Eric Kuzmenko's avatar
      Replace the AP22800 load switch with the P-channel AP22814 load switch IC due... · e1a47582
      Eric Kuzmenko authored
      Replace the AP22800 load switch with the P-channel AP22814 load switch IC due to its reverse current & over current protection capability, add level shifter circuit to the WWAN's DPR signal
      
      Reverse current is no longer an issue with the load switches. One more obvious "TODO" for the schematic left which is to simply place several 100nF bypass caps on the 5V_P, 3V3_P, and 1V8_P rails (investigate how EmCraft is placing these in their layout).
      e1a47582
  26. 02 Jun, 2018 1 commit
    • Eric Kuzmenko's avatar
      Add decoupling capacitors near the WLAN+BT M.2 Key E socket, assign the... · d9722ae3
      Eric Kuzmenko authored
      Add decoupling capacitors near the WLAN+BT M.2 Key E socket, assign the tantalum capacitors their various footprints, find suitable 220uF tantalum bulk capacitors for the M.2 modules which are rated to 10V
      
      Need to figure out if the load switch IC (AP22800) that derives 3V3_P is fine with having the large output capacitance (no unwanted reverse current).
      d9722ae3
  27. 01 Jun, 2018 2 commits
  28. 31 May, 2018 2 commits