4th pin in micro and mini usb was been used to switch microusb socket to host mode. If device detect conection between 4th and groud (5ht pin), switch on 5V on pin 1, and switch to host mode. Mosf offen used on smartpnones before usb-c
I have a usb-C cable from a broken 20V 3.25A laptop charger. It only has 3 wires: Red blue and black. How could it communicate the 20V 3.25 A capability with just one CC wire and no active chip?
In case it only has one end with a USB-C connector while the other being permanently connected to the charger only one is needed. This is due to the second CC line normally being used as supply for the eMarker.
@@quiescentcurrent funny thing is, it's implemented on my usb charging tester too, only the middle pin of the 5 is implemented unfortunately my tester lacks usb-c, and it seems like sth more than a male to female and female to male usb-c_usb-a converters are needed might need to design a pcb to adapt it, still cheaper than buying sth like a fnirst tester
do current lenovo thinkpad power supply usb C (symmetric round) need the negotiating "PD" chip on the connector end, or are the red, blue, ground wires connected straight through ?
I suspect the "emarker" chip should be connected to blue wire inside the power supply ? are there any usb C connectors that accept only 2 wires red thick, blue thin coming from the power supply ? my guess is to connect red to A4 vbus and blue to A5 cc1
@@gf88888 Did you have any success with this? I have a acer USB c 100w charger that got damaged and have got a sacrificial usb c 100w cable to splice but there are 3 wires in the charger cable but my spliced usb cable has both CC and Vconn so i'm confused. I'm guessing the PD chip is indeed inside the charger, so I can ignore the vconn wire inside my spliced cable and just connect to A5 CC1 like you did.
Very, very good explanation and video altogether. I'm hobbyist in electronics but to the very entry level and I have a very peculiar question. I have a usb-c hub with SD card reader, HDMI, Display Port and USB -A2 and A3, then this connected to a tablet, with the idea of a desktop experience through Samsung Dex interface, so I can use a second screen. This second screen (display) might need or not its own power supply depending of duration of use or certain apps demand. This is not a problem for me since most of the use would be on a desktop with ready power available. Now the problem begins with the hub/dongle being left connected, might be because the hub USB-C (DP) is a dual role face port (not sure) and allows for current to withdraw from tablet to hub when the hub's power supply is off and since this has no on/off switch it will drain the tablet's battery really fast. Turning the tablet off (OS) is an inconvenience so I decided to dissect the cable and put a switch on the VBUS connector (red wire). This solved the battery draining, but some how the devices are communicating to each other still. This bring another problem, if someone calls me or text me or somehow the tablet's screen wakeup, it won't go back to off, it just dimms out like when before it goes to turn off but stays dimmed and as result will drain battery fast too. The key is that even if the Vbus is off (disconnected) if I pull out the USB-c plug or put it back in the tablet's port, the tablet will show a brief notification saying external screeen connected/disconnected.. Here is the question: What other wire I need to put in a switch to stop the table to talk to the hub, untill I connected with the switch? Vcomm (yellow), CC1, SBU1,D- (white) or D+ (green)? This cable is full featured also has 4 high speed differential shielded wires for video, I guess.
Excellent explanation! I recently bought a cable tester and the presence of one or both CC pins was a bit confusing. You cleared it up. Thank you!
4th pin in micro and mini usb was been used to switch microusb socket to host mode. If device detect conection between 4th and groud (5ht pin), switch on 5V on pin 1, and switch to host mode. Mosf offen used on smartpnones before usb-c
I have a usb-C cable from a broken 20V 3.25A laptop charger. It only has 3 wires: Red blue and black. How could it communicate the 20V 3.25 A capability with just one CC wire and no active chip?
In case it only has one end with a USB-C connector while the other being permanently connected to the charger only one is needed. This is due to the second CC line normally being used as supply for the eMarker.
great video! I'd really like to know how does xiaomi turbo charge works with that usb a middle pin included in their cables, supplying up to 120w
That's most certainly a non-standard implementation and therefore unfortunately defined by the manufacturer alone
@@quiescentcurrent funny thing is, it's implemented on my usb charging tester too, only the middle pin of the 5 is implemented
unfortunately my tester lacks usb-c, and it seems like sth more than a male to female and female to male usb-c_usb-a converters are needed
might need to design a pcb to adapt it, still cheaper than buying sth like a fnirst tester
@@parsipax6337 USB-C is a lot more complex than the others, but there is a tester for that: ble.caberqu.com
do current lenovo thinkpad power supply usb C (symmetric round) need the negotiating "PD" chip on the connector end, or are the red, blue, ground wires connected straight through ?
You still need an IC to do the PD negotiations, it can be integrated into the power supply though.
I suspect the "emarker" chip should be connected to blue wire inside the power supply ? are there any usb C connectors that accept only 2 wires red thick, blue thin coming from the power supply ? my guess is to connect red to A4 vbus and blue to A5 cc1
@@gf88888 Did you have any success with this? I have a acer USB c 100w charger that got damaged and have got a sacrificial usb c 100w cable to splice but there are 3 wires in the charger cable but my spliced usb cable has both CC and Vconn so i'm confused. I'm guessing the PD chip is indeed inside the charger, so I can ignore the vconn wire inside my spliced cable and just connect to A5 CC1 like you did.
Very, very good explanation and video altogether.
I'm hobbyist in electronics but to the very entry level and I have a very peculiar question.
I have a usb-c hub with SD card reader, HDMI, Display Port and USB -A2 and A3, then this connected to a tablet, with the idea of a desktop experience through Samsung Dex interface, so I can use a second screen. This second screen (display) might need or not its own power supply depending of duration of use or certain apps demand. This is not a problem for me since most of the use would be on a desktop with ready power available.
Now the problem begins with the hub/dongle being left connected, might be because the hub USB-C (DP) is a dual role face port (not sure) and allows for current to withdraw from tablet to hub when the hub's power supply is off and since this has no on/off switch it will drain the tablet's battery really fast.
Turning the tablet off (OS) is an inconvenience so I decided to dissect the cable and put a switch on the VBUS connector (red wire). This solved the battery draining, but some how the devices are communicating to each other still. This bring another problem, if someone calls me or text me or somehow the tablet's screen wakeup, it won't go back to off, it just dimms out like when before it goes to turn off but stays dimmed and as result will drain battery fast too. The key is that even if the Vbus is off (disconnected) if I pull out the USB-c plug or put it back in the tablet's port, the tablet will show a brief notification saying external screeen connected/disconnected..
Here is the question: What other wire I need to put in a switch to stop the table to talk to the hub, untill I connected with the switch? Vcomm (yellow), CC1, SBU1,D- (white) or D+ (green)? This cable is full featured also has 4 high speed differential shielded wires for video, I guess.
What wire do you think I would have to cut?