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General | | include block diagrams for each board in altium controller board changes maybe for telemetry, to make sure SD does not erase on turn off PI should be shutting down before switching to aux we are using the enable pins off of the 5V supplies to turn off pi at will maybe we want a GPIO for shutting off the pi instead
for logging telemetry CAN to ethernet using tritium CAN dongle uses ~100mA router uses a lot ^ ubiquitis seem to be pretty reliable ← not power efficient XPs should work, but we ran into some issues ← they should work and take less power consumption
controller board issues might be because of
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BMS Current Sense | Liam | added new test points for signals and vref 20mA current through resistor across both terminals on op amps. was from previous rev is this an issue for having a passive connect both terminals of the op amp? was from previous rev is the RC correct values/ is the resistor supposed to be a smaller resistor? was from previous rev firmware still has not been to validate readings from ADC, so further issues may arise make the spi test points and gnd test point through holes
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Lights Driver
| Pei | add link to design on schematics buck converter can work at 13.5V and drop dynamically check if led driver can support the current for leds in series and parallel tent all the vias to mitigate shorting possibilities have the input caps closer to input on buck add another cap footprint on input and stuff if see more ripple on input
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LED Board | Pei | for drl currently 4leds in series zeners provide alternate path for rest of leds in case of fault fix the footprint for the connector, so the pegs line up with holes look at distancing between leds for proper diffusing in our setup
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Rules | Pei | found all rules for jlc pcb import through altium, by selecting all parameters in rules make rule set for 4 layers vs 2 layers change to 0.3mm for via size/ largest minimum for 4layer vs 2layers so no mistakes when sending make more rules for general use (i.e. text size, polygon connect, etc.)
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Power Select | Josh | switch fuse location to right after connector change layout to 4 layers? change cap order to U7 to go from vbat fine tune r19 and c21 when the board comes in hold chip in shutdown in startup for discharge? add caps in UV and OV as well either protoype changes on current board to find issues, or add a lot of footprints to current board to play around with values and test datasheet mentions adding these caps with equation to follow add testpoints for enable and shutdown pins on LTC so we can enable and disable easier without firmware high current tespoints - use connector low current - use tespoints with probe hooks maybe high speed - through hole ground beside it and use probe spring? protection on output for overcurrent? add a fuse? figure out if neccessary look for high current/voltage connectors that can be swapped quickly add more mounting points maybe near C12 (in middle ish of board) power calcs on fets for dcdc ? do we need 3 in parallel back to back? there for reducing resistance calculate temperature rise from datasheet 20A, 1.44W = 72 deg C rise in temp <-with horn 10A, 18 deg C rise in temp < -without horn 17A, 50 deg C ->90 deg C if outside? <-max DCDC output probably fine to leave the two paralleling set of fets (no need for 3)
hopefully make the board more dense smaller version of automotive fuses to save space fill in values for notes on aux and dcdc power selection can make values of rc on output of temp amplifier, and make it 1k and .1uf or test without op amp for temp sensing, because possibility do not need this have a 0 ohm jumper and nostuff it to bypass op amp try not to increase resistor too much, can have a larger cap
maybe find another LDO not QFN for easier to rework needed to replace a few times, so would be nice to have easier package also used on other boards, so review other boards when sending new revs
front/rear power have header to jumper + switch between and identical silkscreens
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Timelines | Taiping | Any major layout changes for our electrical systems should be done now, we should look into it since we have a bit more than a year of time Maybe finish our current revisioning, then look at making changes
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Battery Module Connector | Ricky | switched connectors to add two more pins to each add ground pins for thermistors 4 and 5 change pin layout for thermistors vs fuse + resistor lines we have fuses on AFEs as well, which we technically don’t need that
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AFE | Liam, Micah | |
DCDC | Aashmika | change number of ICL to 2 Ambient temperature increase inside a car as 70 deg C to 95 deg C assume ambient as 60 deg C change c16 to a smaller package size and put some caps in series so less likely to crack based on bending of the board down to 60V where would emi ground? email/call vicor and send schematic all ceramics on hv put in series want a better way to discharge look at precharge for discharging test with a transient load drive a fet with a function generator, or use E-load di/dt to simulate a transient load for any ringing on output ask vicor for how to test for this and how to isolated
should look at inductor L1 for 25A or a lower DC resistance <-ask vicor for all selected components maybe use a bimetal switch in series with fan to turn on or off, fans will be used but not probably during normal driving when excluding horns and transients output cap of 15000uf may also have to discharge separately test discharge time for a large load and see if power dist. will switch to aux quick enough maybe have fault pin go to power selection output led for power green
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steering | Aashmika/Sienna | move schmitt triggers to top layer so easier talk to adrian about mounting get rid of grounding on one pin on buttons (always pulled low) power connectors to microfit
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