#apertus IRC Channel Logs

off for now ... bbl

hey John_K!

running into some issues figuring out what components to order though, none of the resistors on the Main Board have values, etc....

let me know which value you are missing, I should be able to tell you

the pullups around the i2c mux are 4k7

also curious which height specifier was used for the JX1, 1,3,4 seem to be options (61083-10*400LF)

for the LVDS pairs you probably want 100R (those are the 0201 ones)

matching what you said to R #'s

guessing those are the i2c mux

is pull down for PIC also 10k?

i.e. probably 50R later, but for now leave unpopulated

and resistor for the buzzer

for the buzzer we used 15R for now

hehehe that's fine, I'm considering omitting it

yeah, that's what we did

or status LED or something

that one is for fan control

i.e. to control a fan usually attached to the microzed FPGA heatsink

does the uZed burn that much power with the current design? or just being forward looking?

the DF12 are only available up to 5mm and the 61083 are available in 4-8mm IIRC

(5mm stacking height)

yes, they have to have the same height

makes sense

it's ok - it meshes well with me filling out these BOMs for order :)

I probably asked that last time, but I don't remember :)

I've got the CMV12000 and BGA sockets already

of course, I've been going off the Google Docs and modifying a copy for now

or should I just DNP components as shown on the v0.18 photo on the wiki? (for me v0.22 board)

what values are the Trim Resistors for the regulators?

for best range 18k to gnd

output 43k

greetings from herbert :)

we are getting close to salzburg

nice

the trim pots should all be 100k?

we figured that the voltage range for most sensors will be between 1.5 and 3.5V

so the most generic option is to have 18k/100k/43k

I'm going to be playing with both CMV12k and CMV20k only

which will give you 1.681V - 3.731V

(might be an idea to drive these with a DAC from a small uC in the future instead of using trim pots)

in the future we will completely rework the power board and add a management unit

especially as the sensor frontend is planned to be "plug and play" i.e. the power board adjusts the voltages for the sensor accordingly

absolutely. I started making an interface board for the CMV20K but am going to have to change the size of the sensor board as the sensor covers the current mounting holes

shouldn't be a problem (the mounting holes)

was considering eliminating the dummy interface board and fabbing a larger PCB that matches with the main board

probably, yeah. I need to figure out what kind of a socket I can use for the CMV20k as well

What other types of things have been imagined to replace the dummy board?

the dummy board will be replaced by a smart FPGA board to connect all the 80 LVDS lanes available on the sensor interface

nah, the intel zif socket, but I'm sure andon is selling a socket for the cmv20k as well

but the cmv20k should not be very problematic because of the large pitch

right

off for a nap ... bbl

Hey folks. Has anyone seen some strange data coming from the sensor when taking the same image/exposure another time? I have taken a shot 2 hours ago which had a max raw value of 4092 so used the 12 bit up to the top. Now I have the same setup, same exposure of the lights (checked double with light-meter), same aperture, same sensor registers for everything and the image maxes out at code value 3199

drives me nuts currently. I'm just trying to tune the sensor output to have a bit more dynamic range ...

did you reboot the camera already?

irieger: only the max value is different, or also the median?

haven't checked that.

wait a second.

median ratio is 1.02

the peak is likely a specular highlight (just a guess, since I didn't see the raw files)

:)

Could someone take apart a Blackmagic camera and record the SPI when they set the sensor up? ;-)

Jep. But I neither have the will to destroy it (the case seems not to be made to be opened), nor do I have the equipment and knowledge to meassure the serial interface ;-)

ah, quite likely, since this sensor doesn't clip sharply to white

what is the ISO on those? seems to be pretty noisy given that the illumination feels like enough

read noise seems to be about 3 units

so, about 9 stops of DR

probably somewhere around iso 1000, from my old calculations

off to bed now ... have a good one everyone!

good night :)

alexML: What technique are you using to find the matrix off of those passports?

(not quite exact, but better than random :P )

Just using curves or?

https://github.com/apertus-open-source-cinema/misc-tools-utilities/blob/master/color-calibration/match_hues.m