1. 09 Jun, 2018 1 commit
  2. 08 Jun, 2018 1 commit
  3. 07 Jun, 2018 3 commits
  4. 06 Jun, 2018 2 commits
  5. 05 Jun, 2018 1 commit
  6. 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
  7. 02 Jun, 2018 2 commits
  8. 01 Jun, 2018 3 commits
  9. 31 May, 2018 3 commits
  10. 30 May, 2018 1 commit
  11. 29 May, 2018 2 commits
  12. 28 May, 2018 1 commit
    • Eric Kuzmenko's avatar
      Add camera/CSI circuit, include second switch that is part of the audio+camera... · 35715ac1
      Eric Kuzmenko authored
      Add camera/CSI circuit, include second switch that is part of the audio+camera DPDT for killing both simultaneously, level shifters used for camera's I/O that requires it, footprints for a 1.8V LDO which may be used by DVDD will be included
      
      External DVDD (1.8V LDO) needs to be tested if it's needed (datasheet says an internal DVDD can be used, as is the case with Boundary Devices' OV5640 camera).
      35715ac1
  13. 26 May, 2018 2 commits
  14. 25 May, 2018 2 commits
  15. 24 May, 2018 4 commits
  16. 23 May, 2018 1 commit
  17. 22 May, 2018 2 commits
    • Eric Kuzmenko's avatar
      Move MIPI DSI & CSI sheets into a "MIPI" sheet, both DSI and CSI will likely... · 01de221d
      Eric Kuzmenko authored
      Move MIPI DSI & CSI sheets into a "MIPI" sheet, both DSI and CSI will likely use the I2C level shifter
      01de221d
    • Eric Kuzmenko's avatar
      Begin assigning footprints to passive components, add component information to... · 37913757
      Eric Kuzmenko authored
      Begin assigning footprints to passive components, add component information to the common 10k resistors throughout the schematic, include TVS diodes on the switch/button I/O pins, use the DB2J20900L schottky diode throughout the design (in place of the ZLLS400)
      
      Added notes about the battery holder, battery size, and the fact that the 103HT thermistor can fit underneath the 18650 battery when the battery is insterted into the holder.
      
      Included frequency response curve for the new/cheaper SMD speaker (slightly thicker mechanical dimension).
      
      Included note about the RedPine RS9116's SDIO_RESET# line expecting a 2.31V VIH logic level, increased the pull-up to 100k (M.2 standard states that this is should be 1.8V level).
      
      Added a TODO note stating the 1.8V logic-level I2C devices should share the same level-shifter that will be on the top-level circuit (in next commit).
      37913757
  18. 18 May, 2018 4 commits
    • Eric Kuzmenko's avatar
    • Eric Kuzmenko's avatar
      Flip the direction of FULL_CARD_POWER_OFF# and W_DISABLE*# switches such that... · ac374526
      Eric Kuzmenko authored
      Flip the direction of FULL_CARD_POWER_OFF# and W_DISABLE*# switches such that the devices are on when the switch is open, this should ever so slightly reduce the power consumption when these devices are used (most likely more often than them being off)
      ac374526
    • Eric Kuzmenko's avatar
      Connect the USB/SDIO bridge to WLAN rather than the uSD, fix a few ERC... · 80b554e5
      Eric Kuzmenko authored
      Connect the USB/SDIO bridge to WLAN rather than the uSD, fix a few ERC violations (not has zero errors/warnings), use best schottky option
      80b554e5
    • Eric Kuzmenko's avatar
      Add current sense resistors and jumper symbols in the schematic, assign the... · e3d28d90
      Eric Kuzmenko authored
      Add current sense resistors and jumper symbols in the schematic, assign the various signals left unspecified, complete the PWR_EN assignment and verify that thepower sequence would be brought up in the correct order, add an LED to the VBAT_REG rail for debugging purposes (know when the board is receiving power)
      
      Both the GP_LED1 and the HAPTIC motor are able to be controlled via PWM2 by individually MUXing the corresponding pads to PWM2. Only one pin should be MUXed to PWM2 at a time whilst the other is a GPIO, otherwise they will behave identically.
      
      The I2C buses do not need the bus switch found on the EmCraft baseboard since the M.2 modules' power is controlled by PWR_EN and their I2C is level shifted between 1.8V<->3.3V, making it safe to leave them as is.
      
      The various sense resistors have their corresponding parts selected but will be "NC" in the BoM and will not be assembled during manufacturing. To measure the current on the various rails (and WLAN M.2), one will need to break the trace between the two pads and place the corresponding resistor. A jumper (1.27 or 2.45 still needs to be determined) can be used to re-short these pads.
      
      Notes have been added regarding which GPIO pins can easily be interchanged if it improves the layout.
      
      Selected a better/cheaper RJ45 receptacle. Also picked out a well-suited green LED to be used in various spots throughout the board.
      e3d28d90
  19. 17 May, 2018 2 commits
    • Eric Kuzmenko's avatar
      Include power load switch ICs to the 3.3V and 5V rails so that the SoC can... · 42c3333c
      Eric Kuzmenko authored
      Include power load switch ICs to the 3.3V and 5V rails so that the SoC can disable the peripherals' power using the PWR_EN signal
      
      Need to verify that 3V3's capacitance is greater than 3V3_P!
      
      Next step is to have PWR_EN control the various logic translator chips EN pins.
      42c3333c
    • Eric Kuzmenko's avatar
      Use a DP3T switch to select between eMMC, USB (serial download), and uSD boot... · 2bf85e1a
      Eric Kuzmenko authored
      Use a DP3T switch to select between eMMC, USB (serial download), and uSD boot devices, corrected the SW_BACK and SW_HOME buttons to have 33Ohm pull-ups instead
      of pull-downs since the respective boot config lines have pull-downs already set
      
      These buttons should be untouched during boot otherwise the board will not boot properly (pressing SW_HOME during boot causes "SD power cycle enable/eMMC reset enable" and pressing SW_BACK causes the uSD to be treated as a 4-bit bus if it's the boot device otherwise it's a BOOTCONFIG[6:4]=011 "reserved" condition)
      2bf85e1a
  20. 16 May, 2018 1 commit
    • Eric Kuzmenko's avatar
      Assign SAI5 to the WLAN/BT M.2, remove SIM2 slot due to conflicts between... · 1df2cd4d
      Eric Kuzmenko authored
      Assign SAI5 to the WLAN/BT M.2, remove SIM2 slot due to conflicts between modules (specifically the L830-EB being a Config_0 module where the TX_BLANKING signal would connected to USIM_PWR2 sink), reassign the corresponding M.2 config pin to handle HP_DET, remove the AMOLED buck-boost as a different regulator will be used
      
      The MIC_SEL, PROX_~INT, IMU_INT, and HAPTIC signals still need assigning
      1df2cd4d
  21. 15 May, 2018 1 commit