USB 13700
usb controller board

the USB 13700 controller board is developed by www.lcdinfo.com and is supported by serdisplib since version 1.97.9.

(image taken from product page)

the controller board is not claimed by any standard kernel module and no kernel module providing ioctl is existing yet. thus only libusb is supported at the moment.

libusb-support might not be enabled!

because USB13700 support requires libusb it has to be enabled using

./configure --enable-libusb

when compiling the library.

ready-made packages (rpms, ...) usually are already compiled with libusb-support.

using the third parameter of serdisp_init(), driver specific options and custom wiring can be set.
common information about passing options and customisable wiring can be found in a separate document.

    examples:

      serdisp_init(sdcd, "USB13700", "INVERT=YES;ROTATE=90");
      serdisp_init(sdcd, "USB13700", "FPSHIFT=1");
    

• must be > 2
• maximum value: 253 - WIDTH / 8
• if value is 0 (=auto): stored value is requested from the controller board

the following options are changed in the flash memory of the controller board if one of these differs from the values stored in the flash memory:

• WIDTH
• HEIGHT
• DISPCLKDIV
• FPSHIFTDIV
• TCRCRDIFF

once flash memory has been updated the values are automatically fetched by serdisplib. setting these options in serdisplib is no longer required afterwards (if these options are given and do not differ from the values stored on the controller board they'll be simply ignored).

important: only change WIDTH and HEIGHT. the other options (DISPCLKDIV, FPSHIFTDIV, and TCRCRDIFF) don't need to be changed in most cases.

• resolution: 640x200 monochrome
• backlight: no
• this description works for me. there's absoletely NO guarantee that it'll work elsewhere.

    LCD    | USB13700 generic  |
   G648D   | display connector | remark
-----------+-------------------+--------------------------------------------
   D3   1  |   8  FPD3         | 
   D2   2  |   7  FPD2         |
  FLM   3  |   1  FPFRAME      | FLM: One-frame timing signal
    M   4  |  13  MOD          |   M: Liquid crystal AC drive control signal
  CL1   5  |   2  FPLINE       | CL1: One-common-line timing signal
  CL2   6  |   4  FPSHIFT      | CL2: Display data shift clock
   D1   7  |   6  FPD1         |
   D0   8  |   5  FPD0         |
  VDD   9  |  11  +5V          |
  VSS  10  |   9  GND          |
  VLC  11  |  15  VEE          | according to data sheet: -24V, see 1)
   Vo  12  |  16  VADJ         | lower than VLC, see 1)
  INH  13  |  14  /DISPOFF     |
 FGND  14  |  10  GND          |
    

¹⁾ finding working values for VLC and Vo:

• setting VLC (VEE) to -24V and Vo (VADJ) to a lower value nearly resulted in a blown on-board variable voltage regulator (the one next to VEE potentiometer) - it started to smell and became very hot.
• finding the correct values is rather tricky but after some fiddling around i've been successful with setting both VLC and Vo to a value around -17.3V.
• beware: always keep an eye on the variable voltage regulator. if it starts to smell lower VEE or VADJ immediately! if this doesn't help: disconnect the board!

• resolution: 320x240
• backlight: yes
• clock frequency: >= 7.5MHz (option DISPCLKDIV needs to be 3 or less. best not to be changed at all (default setting of the board should be OK anyways)).
• this description works for me. there's absoletely NO guarantee that it'll work elsewhere.

    LCD    | USB13700 generic  |
   0150Z   | display connector | remark
-----------+-------------------+--------------------------------------------
   YD   1  |   1  FPFRAME      | YD = FLM
   WF   2  |  13  MOD          | WF = M = MOD
   LP   3  |   2  FPLINE       | LP = CL1
XSCL1   4  |   4  FPSHIFT      | XSCL1 = CL2
  INH   5  |  14  /DISPOFF     | INH = DISPOFF
  XD0   6  |   5  FPD0         |
  XD1   7  |   6  FPD1         |
  XD2   8  |   7  FPD2         |
  XD3   9  |   8  FPD3         |
  +5V  10  |  12  +5V          |
  GND  11  |   9  GND          |
 VLCD  12  |  15  VEE          | according to data sheets: -21V
   Vo  13  |  16  VADJ         | less than VEE (some value around -17.5V, trial and error)
 FGND  14  |  10  GND          | GND
    

• resolution: 640x200
• backlight: yes
• this description works for me. there's absoletely NO guarantee that it'll work elsewhere.

     LCD     | USB13700 generic  |
TLX 1432-G3B | display connector | remark
-------------+-------------------+--------------------------------------------
    GND   1  |   3  GND          |
      M   2  |  13  MOD          | required for my display  1)
  FRAME   3  |   1  FPFRAME      | 
   LINE   4  |   2  FPLINE       | 
  SHIFT   5  |   4  FPSHIFT      | 
    GND   6  |   9  GND          |
    FD0   7  |   5  FPD0         | 2)
    FD1   8  |   6  FPD1         | 2)
    FD2   9  |   7  FPD2         | 2)
    FD3  10  |   8  FPD3         | 2)
    GND  11  |                   | short-wired with 6 (GND)
    +5V  12  |  12  +5V          |
   Vadj  13  |  16  VADJ         | -17V to -19V contrast (according to web search) 3)
    VEE  14  |  15  VEE          | -21V (according to web search) 3)
    GND  15  |  10  GND          | GND
    

¹⁾ some descriptions found on the net say 'not connected' for PIN 2 but this would definitely not work for my display.
²⁾ FP0 to FP3 are twisted on descriptions that i've found on the net but this would result in a distorted output.
³⁾ VEE=-21V works fine for me. Vadj is trial & error