Intro

• Who

  • EngineerComponent Library, Layout: Meghan Dang

  • ManagerArchitect, Component Selection, Schematic, Reviewer, Schematic: Daniel Puratich

  • Firmware: Derek Tang Nathan Green

  • Advisors: Aidan Bowers, Kevin Li

• Why

  • we want to space ESCs out, have a higher datarate, and less harness complexity

  • CAN supported ESCs exist but more expensive and not what we have alr, we like what we have right now

  • DSHOT is already a digital protcol that’s busable

    • single ended

    • prone to ground loops and common mode SI

    • 100mil hdrs into pixhawk and from ESC

• What

  • board solders onto the ESCs both DSHOT data pins that has a JST CAN connector to pixhawk

  • the firmware and hardware will not implement an ESC, we will continue to rely on COTS for this assuming the COTS solution features a standard DSHOT 100mil pitch connection (as the APD ESCs we have right now do)

  • firmware wise this is a CAN to bidirectional DSHOT adapter.

• How:

  • small STM and a CAN transceiver, may require a little LDO for power, see below for design procedure

• When

  • Starting Early June 2024

• Where

  • https://warg.365.altium.com/designs/9504A71D-9B2B-4328-B339-C3EBBC2F7DF1#design

...

CAN Transceiver Selection

• https://discord.com/channels/776618956638388305/1241377889035882646/1242282003018154025

  • copy pixhawk? kinda yea but chosen in discord and no real contest

  • no need for CANFD imo

• common mode choke

  • need to select

  • https://www.ti.com/lit/an/slla271/slla271.pdf?ts=1716408899789&ref_url=https%253A%252F%252Fwww.google.com%252F

  • SRF2012A-121YA

  • https://www.digikey.ca/en/products/detail/bourns-inc/SRF2012A-121YA/5429616

  • ACM2012-201-2P-T002

  • https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1166945/iso1042-q1-common-mode

...

• • -choke-selection-for-can-bus#:~:text=The%20inductance%20of%20the%20common,inductance%20of%20around%20100%20%C2%B5H.

  • ACT45B-101-2P-TL003

  • ACM2012-361-2P-T002

  • B82786L0104N002

  • https://product.tdk.com/en/products/selectionguide/cmf.html

    • doesnt even include CAN lmao

  • https://product.tdk.com/en/techlibrary/productoverview/automotive-cmf_can-fd.html

  • ACT1210D

  • ACT1210D-510-2P-TL00

• switched termination

  • done on ARK board with a low side FET

    • seems like a bad idea if it gets GND offset, other designs online dont show this, see below

  • https://www.analog.com/en/resources/reference-designs/circuits-from-the-lab/cn0401.html

    • https://www.analog.com/media/en/technical-documentation/data-sheets/ADM3055E-3057E.pdf

    • AQY221RV

      • https://www.digikey.ca/en/products/detail/panasonic-electric-works/AQY221R2VY/646325

  • https://www.ti.com/lit/ug/tiducf3/tiducf3.pdf

  • https://toshiba.semicon-storage.com/info/TLP175A_datasheet_en_20230525.pdf

    • https://www.digikey.ca/en/products/detail/toshiba-semiconductor-and-storage/TLP175A-TPL-E/4562829

    • commit to this one, cheaper

• high speed TVS

  • https://assets.nexperia.com/documents/data-sheet/PESD2CANFD24U-QC.pdf

    • exmpla pre nice

  • PESD2CANFD24U-QCZ

  • NUP2105LT1G

Power Decision

LM66100 for RPP

...

https://www.digikey.ca/en/products/detail/texas-instruments/TLV75533PDBVR/9356541 for LDO

...

Schematic High Level

...

Roughly how will system look? nah no point, see the schematic!!