Connectors on the DK Board - Overall List ------------------------------------------- Initial Rev. 22-Nov-2022 Current Rev. 17-Aug-2023 This file is now for the "epon" version of the DK Board. The intent of this file is to make a list of all of the connectors on the Disco-Kraken board. First I will just name the connectors on the DK board and then give a short description of the function and signals on each connector. List of the Connectors on the Disco-Kraken Board ------------------------------------------------ Ref Desig Connector Name Connector Type ------ --------------------------------- -------------------- J1 Main Cable Connector 0.1" x 0.1" 26 pin J2, J3 PMT Analog Signal Connectors harwin_M80-MH313M5-08 J4, J5 Interposer Connectors 2mm x 2mm 40 pin J6 TomCat Mezzanine Card Connector ERF8-025-05.0-S-DV-TR J7 Barnacle Connector 12 pin header J8 Emergency Rescue LPC845 SWD Debug 2x5 0.05" micro-Header J9 JTAG Connector for the TOMCat 10 pin header J10 JTAG Connector for DK's FPGA/CPU 10 pin header J11 Power Supply Monitor Connector 2mm x 2mm 40 pin J12 DK's Access Connector includes Clks 2mm x 2mm 40 pin J13 SFP for Timing Signal SFP Conn and Cage J14 SFP for EPON Ethernet SFP Conn and Cage J15 USB Camera Connector USB Board Mount Connector Description of each Connector on the Disco-Kraken Board ------------------------------------------------------- Main Cable Connector J1: ------------------------- It's my understanding that the Up cable and the Down cable are connected together inside a box and that a pig-tail cable comes out of this box and plugs into the Disco-Kraken board. It's my estimation that the conductors in the main cables, and I assume in the pig-tail, are about #22 AWG. For now I will just assume that the pig-tail plugs into a standard dual row 4 wall male header on the Disco-Kraken board. For now I will assume that this is a 0.1" x 0.1" 26 pin header. Note that 6 of these pins are spares. I believe that the following tables enumerate all of the connections going to the Up and Down cables and assign temporary pin numbers to them so that a tentative net list can be developed. Currently the Main Cable carries only: Signal Ground, 100 Volt power, and the RS-485 Emergency Rescue signal. DOWN Cable Header Pins ---------------------- Signal Ground Going Down 1 Signal Ground Going Down 2 Open 3 Open 4 + 100 V DC Power 5 Open 6 Open 7 Power Return 8 Open 9 Open 10 RS-485 ER Pair Down Dir 11 RS-485 ER Pair Down Cmp 12 Signal Ground Going Down 13 Signal Ground Going Down 14 Spare Header Pins ----------------- Spare Pins 15, 16, 17, 18, 19, 20 UP Cable Header Pins -------------------- Signal Ground Going Up 21 Signal Ground Going Up 22 RS-485 ER Pair Up Dir 23 RS-465 ER Pair Up Cmp 24 Signal Ground Going Up 25 Signal Ground Going Up 26 Notes: Dir and Cmp are the two sides of a differential pair, i.e. Direct and Complement. Pin numbers: 3, 4, 6, 7, 9, and 10 are open to provide voltage isolation for the +100 Volt power or to provide noise isolation for the RS-485 ER link. Recall that the Power Return, i.e. pin #8, is isolated from the Signal Ground but should always be within a few volts of the Signal Ground. There is no electrical connection to any of the metal parts in a module that touch sea water. The Emergency Rescue differential pair just loops through each module. In each module there is just a tap onto the Emergency Rescue pair. That is, there is not a separate ReProgram pair from the Base Junction Box to each module. The pair that brought power from the Base Junction Box up to this module is in principle free to use for some other purpose going in the Up direction only. Its my understanding that there is no plan to use this Up going pair and that it will be abandoned in place. I do not know whether they plan to ground these unused pairs or to just let them float. Typically it would be better to ground them or at least tie them weakly to ground. NOTE that this is all a bit uncertain because we do not know if the splice between the 2 50 meter cables in each Module will be a 2 wire splice or a 3 wire splice. That is for example, will the DK receive just one pair for the RS-485 that makes a 3 wire splice to the 2 main cable sections or will the actual connection of the RS-485 circuit between the up to down cables be made on the DK board (as shown in the pinout above) ? PMT Analog Signal Connectors J2 & J3: -------------------------------------- There are 2 of these connectors on the Disco-Kraken board - one connector for each hemisphere. Each of these connectors carries the coaxial analog signals from the 8 PMTs in a hemisphere to the Disco-Kraken board. Requirements for these connectors include: good low level signal fidelity into the nsec or sub-nsec range, small size, and to facilitate the final assembly of the modules, the ability to plug in 8 coax cables at a time from the side (not the top surface) of the DK Board. The cable mount side of this connector uses 72 mil diameter coax cable (RG-178 size) that will work with the MMCX connectors that plug into the PMT Bases, e.g. Molex MMCX connector part numbers 734150971 or 734150951 for the straight or 90 degree MMCX cable mount connector. Board Mount Side: Harwin M80-MH313M5-08 Cable Mount Side: Harwin M80-FC305F1-08-0450L Interposer Connectors J4 & J5: ------------------------------- This has become a complicated matter because on the Interposer the designer wants to use a vary small rather delicate connector that is manufactured by a sole source and that has space available for only a few Ground pins. We would rather use some standard type of connector and use ground signal pairs where ever possible (and move the timing signal for which they want nsec or sub-nsec accuracy to be a differential signal). What in theory makes a resolution of this possible is that the cable between the Interposer and the DK Board can have a different type of connector at each end. A requirement is that the Module uses only one type of Interposer Board and only on type of Cable to run between Interposer and DK Boards. To make this work, on the DK Board the Interposer Cable Connector needs to be able to plug in normally or rotated by 180 degrees AND one of the DK's Interposer Connectors needs to be wired backwards compared to the other. An additional requirement to facilitate the final assembly of the modules is that the Interposer Cables plug in from the side (not the top surface) of the DK Board. To allow DK board layout to get started, for now I will assume that the connectors on the DK are 2 mm 4 wall male headers with the pinout for the "normal way around" connector based on Adam's 40 pin design from May 2023. Signal - Function Pin -------------------------------- --- Power +3V3 1 Power +1V8 2 Power +3V3 3 Power +1V8 4 Power +3V3 5 Power +1V8 6 GND 7 GND 8 Power +5V0 9 FLASH_NOW to Interposer 10 Power +5V0 11 GND 12 Power +5V0 13 FLASH_SEEN_TDC_STOP to DK 14 GND 15 GND 16 --- 17 PIEZO_DIR to DK 18 GND 19 PIEZO_CMP to DK 20 SPI_MOSI to Interposer 21 CONTROL_RESET to Interposer 22 SPI_CLCK to Interposer 23 ADRS_A0 to Interposer 24 SPI_MISO to DK 25 ADRS_A1 to Interposer 26 UART_Rx to ? 27 ADRS_A2 to Interposer 28 UART_Tx to ? 29 SPI_CS to Interposer 30 GND 31 GND 32 MUON_S1 to DK 33 MUON_S3 to DK 34 GND 35 GND 36 MUON_S2 to DK 37 MUON_S4 to DK 38 GND 39 GND 40 There are still some concerns about this pinout arrangement but it captures what I understand is the correct set of signals for the connection to the Interposers. TomCat Mezzanine Card Connector J6: ------------------------------------ This connector has been defined by Michael and I believe that the correct part number is Samtec ERF8-025-05.0-S-DV-TR although the stacking height may need to be adjusted. The pinout of this connector is defined in Michael's TOMCat information on the web. Barnacle Connector J7: ------------------------ This is a 2mm 2x7 14 pin straight male shrouded header. Including power and grounds about 12 signals are needed to connect to the Barnacle Interface Board. Currently this connector is not on the edge of the DK Board because I assume that this cable can be plugged in before beginning the final assembly of the glass hemisphere over the DK board. Emergency Rescue LPC845 SWD Debug Connector J8: ------------------------------------------------ The intent is to provide a normal modern type ARM Cortex SWD connector on the DK Board. This connector may not actually be install on later production boards. This is a 10 pin 2x5 0.05" micro-header suitable headers are: Sullins: SBH31-NBPB-D05-SPBK <--- prefered Harwin: M50-4910545 Samtec: TFM-105-02-S-D-A Samtec: FTSH-105-01-F-D-K A 10-pin cable is Samtec part number FFSD-05-D-12.00.01-N See drawing nuber 47. JTAG Connector for the TOMCat J9: ---------------------------------- This is a normal 2mm x 2mm 2x5 10 pin shrouded header. Pinout is to match TOMCat preference. JTAG Connector for DK's FPGA/CPU J10: -------------------------------------- This is a normal 2mm x 2mm 2x5 10 pin shrouded header. Pinout is to match the MicroChip FPGA/CPU standard. See drawing nuber 13. Power Supply Monitor Connector J11: ------------------------------------ Pinout to be defined. A 2mm x 2mm 40 pin shrouded header. Both Voltage and Current Monitoring. The intent of this connector is to allow accurate measurement of all power supply voltages and currents during Final Assembly and Testing of each Disco-Kraken board. A second motivation for this connector is to allow the above measurements without needing to poke around on the board with the probes from a digital voltmeter. The point of making these measurements is both to verify the correct operation of the various power supplies and to verify that the current loads are the expected values. The assumption is that a multi-wire cable will plug into this connector, and that this cable runs to a rotor switch and that the output from this rotor switch goes to a known accurate DVM. We typically isolate these voltage check points with 100 Ohm or 1k Ohm resistors so that even short circuit in the test setup will not over stress the on-board power supplies. A 40 pin 2 mm 4 wall male header on the DK Board will allow measurement of 10 voltages and 10 currents. DK's Access Connector includes Clks J12: ----------------------------------------- Pinout to be defined. A 2mm x 2mm 40 pin shrouded header. Included Clock Monitoring. The intent of this connector is to provide easy access to any signals that may need to be checked during Final Assembly and Testing. For example one may want access: to some of the I2C or SPI links, to buffered copies of some clocks, to a few FPGA-CPU I/O pins for example to look at on a scope or to trigger a logic analyzer. to multiple ground pins The goal is to provide access to any signals that may be needed without soldering any little white wires onto the card. An additional goal of this connector is to provide a connector for any special function "wonderful ideas" that someone may have at the last minute. We sometimes call these a "lifeboat" connector. SFP for Timing Signal J13: --------------------------- SFP Connector AMP 1367073-2 SFP Plus Connector AMP 1888247-1 SFP Cage AMP 2227023-1 or -3 SFP for EPON Ethernet J14: --------------------------- SFP Connector AMP 1367073-2 SFP Plus Connector AMP 1888247-1 SFP Cage AMP 2227023-1 or -3 USB Camera Connector J15: -------------------------- I believe that this is a normal old large size USB connector. The DK will provide On-Off Control of the 5 Volt power to this USB connector. I assume that this connector needs to be on the edge of the DK Board to facilitate final assembly or to facilitate the buldge in the USB cable plug ? The DK layout is for a generic Type A THD receptacle such as AMP 292303-4.