sufst / pcb Goto Github PK

Description

ps1 part has incorrect orientation of silk screen, but polarity is correct

Description

Brake plausibility sheet comparator IC is not powered.

Expected Behaviour

Power supply connection and decoupling capacitor added.

Description

Don't need the version numbers in the file name - that's what we have version control for!

Description

Add CMOS buffers before/after input/output level shifters. This will help avoid issues with the optocoupler interface.

Description

Move symbols, footprints and step files in precharge to shared library.
This will require the library paths to be updated.

Description

The footprint for the transistor which is used in the following circuit is wrong:

The footprint is BCE, but most transistors we have (BC557, 2N3906) are CBE.

Expected Behaviour

Footprint changed to CBE.

Description

Add an analogue input channel for the steering angle sensor.

Description

The VCU has the R2D and VC LED outputs swapped.

Additional Notes

Small schematic error, easily fixed in a future revision. This has been patched in software for now, remember that it will need to be changed if this is fixed on the PCB.

Description

Optional termination for CAN transceivers.

Description

It would be useful to show the polarity of the power input connection on the front silkscreen. Currently it is only labelled on the back.

Additional Notes

This definitely used to be on older designs, but must have accidentally been removed at some point.

Description

Analogue SCS inputs should be pulled down such that they read zero if disconnected.

Description

Output shift optocouplers pull up to 3.3V instead of 12V.

Expected Behaviour

Output shift optocouplers pull up to 12V.

Description

Current CAN transceiver is not 3.3V compatible, and the MCU operates on 3.3V. Replace with a 3.3V transceiver.

Description

Analogue inputs from the APPS need to be buffered as the current resistor divider design affects the transfer function of the sensor.

Expected Behaviour

Unity gain op-amp buffers added to analogue input channels.

Description

Latching behaviour is the opposite of what we want, currently the output latches high when leaving the fault state and entering the "ok" state.

Expected Behaviour

Output latches low when leaving "ok" state and entering fault state.

Additional Notes

The inputs from the BMS and IMD need to be inverted and Q' of the latches used as the output. Q = 1 should represent a fault state and Q = 0 should represent an "ok" state.

Description

Update schematic for STM32-F746ZG board.

Requirements

• New schematic for STM32-F746ZG connectors.
• Remove third CAN transceiver.
• Update connections from MCU to rest of board.

Description

Opening projects created in KiCad 6 with KiCad 7 causes a change to the project file which may be accidentally committed if the project is opened for reference when working on something else. To avoid merge conflicts caused by this, we should probably just open everything in KiCad 7 once and commit the changes.

Description

Rough calculation assuming 5A fault current indicates traces need to be about twice as thick between the input voltage taps and the fuses.

Requirements

• Thicken traces.

Description

Add NVM for use by the VCU microcontroller for parameter configuration.

Requirements

• Spec new EEPROM.
• Add to schematic.

Description

Connectors are currently vertical, it is better for them to be horizontal to reduce height / simplify routing in the junction box.

Description

The resistor values used to divide down the HV are very non-standard and not generally stocked at the university. They should ideally be replaced with values which are more common.

Description

Add LEDs to indicate key states in the BSPD:

• SCS implausible (red, on during fault).
• Brake and throttle pressed (red, on during fault).
• Shutdown output state (green, on if shutdown circuit closed).

Additional Notes

SMD LEDs on the PCB and one external LED on the BSPD box (via connector).

Description

SDI and SDO connections have silkscreens swapped:

This does not affect the functionality of the design at all.

Description

Create the project-specific PR template for this repo.

Description

Button connections are not labelled on the back silkscreen as shown in screenshot below (they are the top right 3 pins on the connector). Would be good to do it the same way as the LEDs.

Description

Clips on Molex connectors are currently facing towards the inside of the board. This makes it harder to remove them.

Expected Behaviour

Clips facing towards outside of board.

Description

IMD input is not pulled down which is potentially undefined behaviour if the connection is broken and the input is floating.

Expected Behaviour

IMD input pulled down.

Description

TSAL driver does not have enough output connections for LED strips. Need 2x for each colour.

Expected Behaviour

LED connector changed from 4x1 to 4x2 connector.

Description

5V regulator tab is the regulator output and not ground. This causes a short to the large exposed copper pad. The net of the pad should be changed to 5V and a new (small) 5V plane created.

Description

430450400 is a 2x2 dual row Molex connector (product page), but the STEP file is the single row 4x1 connector.

Expected Behaviour

Name is corrected and 3D model paths updated.

Description

PCB is currently un-labelled, would be nice to add:

• Connector names on the top of the board.
• Pin names on the bottom of the board.
• The project name and version number.
• SUFST stag logo (if space).

Description

The design using the D-type flip flops U1 seems to not be working. The potential culprits could be the power on state (POR) or the method in which U1 is wired.

A redesign is required.

Steps To Reproduce

1. Connect power into the circuit using 12V supply
2. Connect the IMD_Ok signal into the board (J2 pin 2) and connect to 10V supply
3. Connect the IMD_OK_LATCHED signal to an oscilloscope (J3 pin 2)
4. Power on 12V and 10V simultaneously. You will notice that the latching will latch into the fault state (J3 pin 2 LOW). This issue persists even if the IMD_Ok signal is connected to the 12V supply to have a truly simultaneous connection in.
5. Power on 10V slightly earlier than 12V. You will notice that the latching will now latch in the no-fault state (J3 pin 2 HIGH). However when IMD_Ok signal is sent to the fault state, the circuit remains latched in the no-fault state.

Environment

B16 tools and equipment

Expected Behaviour

When turned on simultaneously, the circuit should boot up in a no-fault state given that no faults are detected. If a fault is detected, the circuit must latch in the fault state and remain latched even if the IMD_Ok state changes to the no fault state. Power cycling the circuit should remove the error given that the signal is in a no-fault state.

Description

Import existing designs into this repo.

Requirements

• VCU
• TSAL
• HV sense
• BSPD
• Discharge
• Latching
• Precharge.

Description

DRS servo can be driven directly from a timer pin on the MCU, instead of with an extra driver chip.

Requirements

• Remove old driver chip.
• Add DRS output pin to MCU.
• Level shift DRS output.
• Add DRS to connector.

Additional Notes

The servo is 5V, so the 3.3V MCU output will need to be level shifted.

Description

Change DRS servo control system to operate at 12V. Potentially add a current measurement mechanism for intelligent servo control. The 5V regulator can be removed, which will fix #49.

Description

Clips on Molex connectors are currently facing towards the inside of the board. This makes it harder to remove them.

Expected Behaviour

Clips facing towards outside of board.

Description

fp-lib-table for TSAL contains:

(fp_lib_table
  (lib (name "footprints")(type "KiCad")(uri "/home/joe/pro/sufst/precharge/hardware/precharge/footprints.pretty")(options "")(descr ""))
)

This should be a path relative to the project, instead of an absolute path specific to one user.

Not sure if this breaks the PCB in some way?

Steps To Reproduce

1. Look at contents of tsal/fp-lib-table.
2. Single entry in table with path specific to one user.

Expected Behaviour

No absolute paths in table.

Description

Shielded cables coming into the VCU need a connection to LVS ground. This can be provided through an extra/unused pin on the connectors.

Description

When soldering the board, it is hard to tell what the correct orientation of the EEPROM IC is. There is a small dot, but it's not immediately obvious because it really is tiny. Might be good to add a larger dot/circle below pin 1. The reference designator for the IC is also on the opposite side to the dot, which could be incorrectly interpreted as the side of pin 1 if the dot isn't seen.

Description

Need some instructions on how to use this repo, how KiCad works with version control, etc.

Description

Some symbols were missing after migration from the old separate PCB repos to this new monorepo. The schematic / PCB are fine, but these should be sorted eventually.

Additional Notes

Causes ERC errors below: