Hi,
I hope this place is god for posting questions regarding manufacturing and designing Type-C cables.If not I hope can you direct me to an apropriate place.
See following design and Questions:
Introduction:
We are designing a cable for our device to connect with external sensors, the cable length which we want to use is 1.8M with with Type-C connectors.
Originaly we used USB Type-C cables withouth electrical marking chip which had length of 1.6M with 22 pins with fully connected leads. This way we could transfer four analog signals on (A11,A10,A3,A2,B11,B10,B3,B2) and digital SPI BUSS lines on (A5,A6,A7,A8,B5,B8) leaving the (B6,B7) unconnected.
The PCB boards were designed so that the cable conector could be pushed in also flipped.
This is how we used the cables: green- analog signal, red and yellow data leads, blue-clock, pink-chip select
The A7 and A6 digital data lines were twisted and foil shielded, the analog lines were paired twisted and foil shielded making four bundles like this ( GND-A11-A10, GND-A3-A2, GND-B11-B10, GND-B3-B2,) solid wire was used on all leads. The compleate cable bundle was foil shielded and braided than jacketed.
Afterwards we searched for comercialy available cables an found amazonbasic type-c 3.1 gen1 usb cables but those had e-marking chips on them and teh digital communication was not working with the remote sensors. Afterwards we opened the cables and reruted the cables also to communicate with the digital sensors. this was teh configuration
stranded wire-> isolator->braided shielding->foil shielding used for the analog signals
stranded wire-> isolator->foil shielding used for the digital signals
this way the communication works realy good and some noise was reduced.
According this informa we would like to configure our custom cables for analog signal and digital signal.
Questions:
How can we improve more analog signal quality? coax type cable lead, thicker middle core? stranded or solid wire? type of wire copper or zinced or other? (stranded or solid wire-> isolator->braided shielding->foil shielding )?
Example analog signal (A11 and A10 leads with configuration (stranded wire-> isolator->braided shielding->foil shielding )) and twisting these pairs than foil shielding?
How can we improve more digital signal quality? coax type cable lead, thicker middle core? stranded or solid wire? type of wire copper or zinced or other? (stranded or solid wire-> isolator->braided shielding->foil shielding )?
Example digital data leads(A6 and A7) (stranded wire-> isolator->braided shielding->foil shielding )) and twisting these pairs than foil shielding?
For clock and chip select using the same configuration as for data leads.
Which is the best cable lead configuration for digital or SPI commonication?
Which is the best cable lead configuration for the analog signal?
is it okk to have one analog signal sending throu cable in two leads? type-c cable configuration has that feature, originaly it was used that way
Is it possible to only use 8 leads for type-c cables?
if 8 leads are used the signal is not doubled is it good or bad? how?
if 8 leads used for cables and type-c connector, how shoulld it be configured to send the signal properly throu the cable.
If clarification is required just ask .
Thanks for helping.
Robert
