Tiliqua R3 Motherboard: changelist (WIP)

[vk2seb]

required

• +5V SMPS: increase polyfuse ingress current for +VUSB host output
  • polyfuses on all external power outputs? IGNORE
• +5V SMPS + 3V3 linear: gets pretty hot - increase LED pull downs?
  • Swap all tantalums for 1206 X5R ceramics
  • More vias + ground standoff post
• +/- 12V ingress: check noise, add filtering
• USB2: review/revise footprint
  • And reduce PCB thickness - 1.2mm?
• Encoder: shuffle back (maybe shim between encoder + panel)
• GPDI: pinswap PMOD routing for cleaner GPDI routing
• GPDI: current limit +5V out (or switchable?)
• GPDI: Fix PCA VREF2 resistor, add ability to disable EDID I2C bridge using EN line.
• RP2040: switch to mfg-recommended XTAL (optional)
• SC3: MicroMod Hole alignment is slightly off. Center it.
• M2: reflowable standoffs, change source

nice

• RP2040: add LEDs
• RP2040: route encoder pins to spare hi-Z inputs
• RP2040: put it on the local and eurorack-pmod I2C buses
• RP2040: add ability to control PDN (I2S?)
• RP2040: connect some pins to PMOD output for internal Vex JTAG?
  • Could even use the same JTAG pins? worth testing.
  • Extreme: move JTAG loopback to SC itself?!
  • Try this bodge on old Tiliqua
• soldiercrab: second standoff hole for future?
• soldiercrab: Route new I2C pins to RP2040 (or somewhere else)