Dennis Field / dvk-mx8m-bsb - History

Modify the boot config/boot mode pins and switch such that only eMMC and USB (serial downloader) are boot options due to the uSD being attached to the USB<->SD bridge chip, add OV5460 notes about using the internal DVDD 1.5V regulator

Add smart card circuit using the SEC1110 USB to ISO/IEC 7816 bridge chip, include ID-0001/2FF/mini-SIM socket connector selection informatino (1010027182)

Need to create footprint for the mini-SIM socket

Move MIPI DSI & CSI sheets into a "MIPI" sheet, both DSI and CSI will likely use the I2C level shifter

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).

Add MIPI CSI sheet (contents need to be added once camera selection is complete)

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)

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

Added schematic page with USB hub/SD Card controller USB2660
deleted old USB hub and SDIO demultiplexer

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.

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.