Dennis Field / dvk-mx8m-bsb - History

Update the schematic symbols and footprints after upgrading to KiCad 5.0.0, fix all ERC and DRC violations after the new update/upgrade

Add a 100k pull-down resistor to the the class-D audio amplifier's SD# / MUTE pin

Move the charge controller, USB-C TCPC, and RTC to I2C1

Since each of these ICs will be powered at the same time as the SoM regardless of the PWR_EN state, they should share the same I2C bus as the PMIC.

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.

Move CAPTOUCH_~RST from BOOT_CFG_03 to GPIO1_IO05/P3.33 (was CSI_P2_PWDN), add a 10k pull-down to LCD_~RESET, make the corresponding changes to the BoM and netlist/layout

Having CAPTOUCH_~RST on BOOT_CFG_03 caused a voltage divider on the pin.

Fix all DRC violations in the layout by making corrections to various footprints

Rename all diff pairs such that they end in _P/_N rather than just P/N (underscore needed for diff pair routing)

Add 18pF capacitor to WLAN+BT M.2 circuit as is done on the WWAN bypass cap array

Replace camera's schottky+resistor level-shifter circuit with the more functional TXB0101 dedicated IC