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Ideapad K1 DIY Host Cable [Pinout] (Help Needed) !

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OP Shaztech

Shaztech

Member

  • 42 posts

Posted 19 January 2012 - 10:44 AM #1

I'm tired of waiting for Lenovo host cable and that I cannot charge my tablet when I'm connected on the computer...
I want to add ports on the bottom like micro usb, standard dc connector and another one for usb host.
I know there space inside between the prop. connector and the right side. !


I'm compiling a Pinout but need someone that already have a host cable (some EU users receive one).
Please test each pin and post it here !!!
I will update a FULL pinout and pictures when completed

Update: The USB connector has every pins so I will use it !

Left Pic: TOP (Screen Side)
Right Pic: BOTTOM

Posted Image

01, 02, 33, 34: GND
07, 09, 11, 13, 28 : GND

17: +3V out when pin 30 grounded
18: +12V in (Charger)

04: Trigger Headphones when Grounded
30: Trigger USB Host ??? Output 3V on 17 when Grounded
31: Trigger USB Client (to PC) when Grounded

8, 10, 12, 14: Possibly Headphones Right, Left, Mic...

15: GND (Trigger ??)
20: GND(Trigger ??)

21: USB Client D-
23: USB Client D+
24: USB GND


There's no +5V out so maybe a trigger activate it !

Thanks for your help !

Edited by Shaztech, 20 January 2012 - 03:05 PM.

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OP Shaztech

Shaztech

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  • 42 posts

Posted 20 January 2012 - 10:08 AM #2

I will try some combinations tonight ! :android-smile:
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wy13

wy13

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Posted 05 February 2012 - 07:18 PM #3

Theory.

The connector is probably multi-use with solder connections based on use. From the looks of the printed circuit, pins 15, 20, and 31 are meant to be either soldered or unsoldered.

If pin 31 triggers usb client (and is currently grounding because that is a client cable), and grounding pin 30 triggers 3V on 17, perhaps pin 31 is keeping 17 from reaching 5V. Perhaps ungrounding 31, then grounding 30 will trigger host and give you 5V on 17 (can't have host and client at the same time)?
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OP Shaztech

Shaztech

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  • 42 posts

Posted 06 February 2012 - 03:39 AM #4

Theory.

The connector is probably multi-use with solder connections based on use. From the looks of the printed circuit, pins 15, 20, and 31 are meant to be either soldered or unsoldered.

If pin 31 triggers usb client (and is currently grounding because that is a client cable), and grounding pin 30 triggers 3V on 17, perhaps pin 31 is keeping 17 from reaching 5V. Perhaps ungrounding 31, then grounding 30 will trigger host and give you 5V on 17 (can't have host and client at the same time)?


Already tried it, Pin 31 is currently "cut" so no GND on 31.
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wy13

wy13

Average Android

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Posted 06 February 2012 - 04:00 PM #5

I wonder if the keyboard dock is actually using usb connections. My understanding is that the keyboard dock can be operated sans charger (it just won't be charging in use). If so, it may be possible that the keyboard is initiating the tablet into usb host mode. I don't know because I don't have a keyboard dock to test out.

By the way, does anyone know if the "proprietary" connector can be sourced from anywhere?
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khf

khf

Average Android

  • 2 posts

Posted 18 March 2012 - 06:32 AM #6

I'm tired of waiting for Lenovo host cable and that I cannot charge my tablet when I'm connected on the computer...
I want to add ports on the bottom like micro usb, standard dc connector and another one for usb host.
I know there space inside between the prop. connector and the right side. !


I'm compiling a Pinout but need someone that already have a host cable (some EU users receive one).
Please test each pin and post it here !!!
I will update a FULL pinout and pictures when completed

Update: The USB connector has every pins so I will use it !

Left Pic: TOP (Screen Side)
Right Pic: BOTTOM

Posted Image

01, 02, 33, 34: GND
07, 09, 11, 13, 28 : GND

17: +3V out when pin 30 grounded
18: +12V in (Charger)

04: Trigger Headphones when Grounded
30: Trigger USB Host ??? Output 3V on 17 when Grounded
31: Trigger USB Client (to PC) when Grounded

8, 10, 12, 14: Possibly Headphones Right, Left, Mic...

15: GND (Trigger ??)
20: GND(Trigger ??)

21: USB Client D-
23: USB Client D+
24: USB GND


There's no +5V out so maybe a trigger activate it !

Thanks for your help !

Hi
please if you obtain solution yet tell us.
thanks for topic.
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khf

khf

Average Android

  • 2 posts

Posted 18 March 2012 - 06:37 AM #7

I'm tired of waiting for Lenovo host cable and that I cannot charge my tablet when I'm connected on the computer...
I want to add ports on the bottom like micro usb, standard dc connector and another one for usb host.
I know there space inside between the prop. connector and the right side. !


I'm compiling a Pinout but need someone that already have a host cable (some EU users receive one).
Please test each pin and post it here !!!
I will update a FULL pinout and pictures when completed

Update: The USB connector has every pins so I will use it !

Left Pic: TOP (Screen Side)
Right Pic: BOTTOM

Posted Image

01, 02, 33, 34: GND
07, 09, 11, 13, 28 : GND

17: +3V out when pin 30 grounded
18: +12V in (Charger)

04: Trigger Headphones when Grounded
30: Trigger USB Host ??? Output 3V on 17 when Grounded
31: Trigger USB Client (to PC) when Grounded

8, 10, 12, 14: Possibly Headphones Right, Left, Mic...

15: GND (Trigger ??)
20: GND(Trigger ??)

21: USB Client D-
23: USB Client D+
24: USB GND


There's no +5V out so maybe a trigger activate it !

Thanks for your help !

menwhile, i found a site about cracked ideapad k1 opening
the chipset for usb is smsc 3315 .
you can find the datasheet for that.
http://www.techrepub...to-service/2894
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gallahad2000

gallahad2000

Member

  • 23 posts

Posted 07 April 2012 - 11:32 AM #8

Cable available at lenovo for $12 + free shipping!
http://shop.lenovo.c..._menu_area=true

Also Provantage:http://www.provantage.com/YLEN92U2.htm
Macmall:http://www.macmall.c...171~pdp.haicccb
Alvio supposedly has it but can't find it, perhaps due to being out of stock
PSsuperstore:http://www.pcsuperst...vo-0B65411.html

Someone from the lenovo forums confirmed that the provantage cable works with their K1.

Source:http://forums.lenovo.../593525/page/38

Edited by gallahad2000, 11 April 2012 - 09:25 AM.

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olivierc

olivierc

Average Android

  • 3 posts

Posted 31 May 2012 - 07:35 AM #9

Hi everyone I have looked at the spec USB chip smc USB3315, and also googled a lot about how does the OTG works.
And I came to the conclusion that grounding the ID pin of the USB3315 will activate OTG on K1. This what the datashee states:"ID pin of the USB cable. For non-OTG
applications this pin can be floated. For an A-Device ID is grounded. For a BDevice ID is floated."

Now the question is, which of all those pins is the ID pin ?
As soon as the ID pin is grounded I think that we will get the 5V on the VBUS pin which I think is the pin 24, labeled GND at the top of the post.

So the pin are
21: USB Client D-
23: USB Client D+
24: USB VBUS (+5V in OTG mode)

? : ID pin

If I find some extra time I will try to buy on ebay an extra USB data cable, and try to ground the unknown pin.
Or if Shaztech can try to ground pin 22, to see what happens....

Or if someone has bought the OTG cable and can measure the resitance between ground and all pins, we will apreciate a lot.
If pin is grounded the resitance should be 0.
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olivierc

olivierc

Average Android

  • 3 posts

Posted 31 May 2012 - 07:45 AM #10

Check this link
http://forum.xda-dev...d.php?t=1092493

Change the the micro USB B conector of the scheme by the 37 pin ideapad K1 conector.... If we knew where is the ID pin (sense pin) it should work.
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