ELogs/Electronics

Electronic Log for Electronics Development

Oxford

Pete Hastings

Mark Jones

Power supply board

Ready for experimental visit to Trento, 28th September 2025

• Power distribution board required for QuARC.
• Provide power for Raspberry Pi and DDC boards from single DC input:
  • 5V/5A for Raspberry Pi via USB-C
  • >7.5V (5A?) for DDC board daisy chain via 2.5mm barrel
• Single USB-C PD input: 20V/5A
  • Needs USB-C PD voltage negotiation chip
• Fallback option with 20V DC 2.5mm barrel jack input
• LEDs to indicate each voltage is provided correctly:
  • 20V input
  • 5V to Raspberry Pi
  • >7.5V to DDC boards
• Should be able to switch off LEDs
• Necessary to switch between input power supplies?
• Ensure both power outputs stable: no drop-outs!
  • Potential for USB-C PD to drop out when voltage renegotiated?

DDC Photodiode Board Rev.F

Upon completion of power distribution board

• Remove RESET connection from CC2 pin on all DDC board USB-C connections
• Resize DDC board to accept Hamamatsu S12362 16-element photodiode array in place of Hamamatsu S12915-16R single photodiodes
• Reduces pitch from 3mm to 2.5mm
• 2 photodiode arrays per DDC board (2 x 16 element arrays = 32 channels)

Scintillating Fibre Profile Monitor Front-end Boards

Upon completion of Rev.F board

• Integration of scintillating fibre profile monitor based on design from Blake Leverington, University of Heidelberg
• Hamamatsu S17285 photodiode arrays to couple to scintillating fibres
• Interface board needed between USB-C connection from FPGA and photodiode arrays
• Acquire data; distribute timing signals

Imperial

Andy Rose

Duncan Parker

QuADProBe FPGA Upgrade

• QuADProBe QAD to be upgraded from USB104+Raspberry Pi to Kria:
  • AMD Kria K26 SoM
  • Kria K26 SoM Data Sheet
  • Kria KV260 AI Vision Starter Kit
• Kria available off-the-shelf but carrier board needed
• Imperial to design carrier board with multiple I/O for QuADProBe:

IO specification

• Connections for AMD Kria K26 system-on-module
• 11 “USB-C” IO connector
  • Vertical right-angle (“flag”) connector
  • 5x differential-pairs, at-least one connected to HP clock-capable pins
  • 4x single-ended, to 3v3 HD pins
  • 20V power - power-enable, O/V and O/C protection
• 1 “USB-C” IO connector
  • Vertical right-angle (“flag”) connector
  • 3x differential-pairs, connected to HP global-clock pins
  • 4x single-ended, to 3v3 HD pins
  • 20V power - power-enable, O/V and O/C protection
• GbE via RJ45
• M.2 SATA disk
  • Or NVMe disk? IIRC can be made resistor-changeable to PCIe?
• M.2 PCIe?
  • A+E key? M key?
  • 2 lane PCIe
• uSD card
• RPI5-compatable PCIe
  • 16-pin, single-sided, 0.5mm pitch FFC
  • Connect to PL GTH transceivers
• 4-pin fan-header?

Power specification

• USB-C power connection – 5A @ 20V
  • Requires negotiation
• Barrel-jack fall-back power
• Hold-up caps?

Mechanical specification

• As low-profile as possible
• Not overly constrained in lateral dimensions – as compact as reasonably possible
• Mounting holes
• Heatsink?
• All connector on one edge?
  • Except RPI PCIe (and fan-header if used)

To-do

• Swap USBs to flag-type
• Make power switches disabled by default (pull-up on En# lines)
• I2C for power negotiator
  • 20V USB-C PD/DC power input
  • 11 x USB-C sockets connected to PL for detector interface