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Author Topic: Wacom Digitizer from Thinkpad X60/X61 Tablet  (Read 1772 times)
Mystic-X
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« on: May 21, 2013, 08:19:49 PM »

Hello Everyone!

I'm a user of thinkpad X60 Tablet since 2007 and i really like the Wacom Digitizer and touchscreen!

I've got a X61t with broken screen. So I took this as a chance to upgrade my X60t with the newer mainboard...

The screen was broken but the touchscreen and the Wacom Digitizer were still working. So I peeled this stuff off and had a closer look on the hardware.

The Display unit has the IBM Partnumber: FRU 13N7205

The Wacom Type (or whatever it is) SU-1208E-01X

The resistive touchscreen is evaluated by a Gunze AHL-71N chip.
This company does not provide much information on this thing.
http://www.gunzeusa.com/controller-chip-comparison-guide

But I found this chinese manufacturer: http://www.daisendenshi.com

they have a singleboard computer that uses this chip:
http://www.daisendenshi.com/products_view.php?products_id=330&products_name=SH-2009&master_categories_id=137

The schematics are included in the manual:
http://www.daisendenshi.com/cart/images/SH-2009/sh2009_usersguide.1.0.1.pdf

exerpt from the manual:


looked well to me because it communicates via RS232 =)

but i had a closer look on this things

the Wacom W8003 brought me to this forum, but I found no further information on this piece of BGA-shit

so I tried to find out what the third larger chip on this PCB was
it is an µPD78F0535A microcontroller
datasheet: http://www.opternus.com/uploads/media/UM_78K0_KE2_04.pdf

some beeps of my multimeter and 2 hours later I had understand the most connections of the wire coming from the mainboard



I don't know what this orange cable that is connected to pin 50 (analog input) is uses for.
and I was not able to follow the trace after resistor R2 & R3 because they directly and in a feedthrough Sad

I'm going to get a MAX232 TTL-converter now to make some tests with the drivers provided by IBM/Lenovo.

Anybody out there with some further knowledge about the wacom drivers communicate with this things and how this things are connected inside an notebook/tablet pc?

regards from Germany
Markus
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bernard
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« Reply #1 on: May 26, 2013, 03:30:18 AM »

AWESOME!  Cool

We have been trying to reverse engineer this thing once and for all (but partially failed). A few interfaced it. My WaxBee can also interface it. Some of these are USB (not serial). There are variants which blurs the results I think. Also Wacom seemed to have created *tons* of different custom digitizers. The central piece of information is stored on a wiki page with links to various forum posts:  

http://wiki.bongofish.co.uk/doku.php?id=bongofish:penenabled

I would be happy to add more to this.
« Last Edit: May 26, 2013, 04:50:09 AM by bernard » Logged
bernard
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« Reply #2 on: May 27, 2013, 02:52:10 AM »

From what I remember: We got most of the pin labels through a manual that I got my hands on (not for free) which explained the laptop's internal connections a little. You'd have to follow undersampled's thread.  The serial signals goes through an internal "super-io" chip with a UART (and other ports).  The rest is myriads of experimentation from various folks. You have all those great wacom digitizer on ebay for real cheap that, we feel, should not be difficult to interface.    (the protocol for penenabled digitizer is called ISDV4).   The Linux drivers contains lots of useful information on how stuff are connected too.

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Mystic-X
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« Reply #3 on: May 27, 2013, 07:10:37 PM »

I have the complete schematics for Thinkpad X60 and X61 but sadly the non-tablet models, so the most interesting things are missing...
but there is a serial signal on the LCD-connector in the non-tablet models too! it is directly connected to the super-I/O-chip

If I find some time this week I'll measure some things on the PCB in its normal working environment!

pinout of my board looks nearly the same as shown in the wiki but thats no wonder... no-one is going to design a new PCB for every new costumer

I had a look at this linux driver things for the thinkpads: http://www.thinkwiki.org/wiki/Wacom_Serial_Tablet_PC_Stylus
also says its directly serial....
but I'm not that into linux so I'm going to get the things work under WinXP

I thought I had one of this creepy USB-to-RS232 adaptors here which just give out TTL-level but can't find it... so I'll have to wait for the things from china
I don't want to get my controller destroyed by too high voltage from a REAL RS232....

I bought some nice small PCBs with SMD Parts its cheaper and smaller than making something on my own and they'll fit everythere...
I want to assamble this thing to my Thinkpad X31 if it is really working....

I'll post again if I have something new....
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