[sane-devel] [sane-Bugs][313692] CanoScan LiDE 90 support

Hiroshi Miura miurahr at linux.com
Fri Jul 13 23:04:39 UTC 2012

Hi Stef and genesys developers,

Canoscan LiDE 90 use BU6574FV which was found in previous discussion in

*Guillaume wrote:
> I open my LiDE 90 (very hard not all to destroy...).
> I find these IC's :
>         GL842 (Genesys well known scanner chip)
>         GLT44016P (SO40 RAM)
>         BU6574 (TSSOP20 ????????????)
>         VHC175 (TSSOP16 quad flip flop)
>         VHC08 (TSSOP16 quad and)
>         LB1940 (TSSOP20 constant current driver)
>         LM324 (SO14 quad op amp)
>         1733 (TO-263 regularor)
> Appart the BU6574 (I dont find what it is) I dont find any analog
> frontend. Is it possible that this chip is located with leds (seems very
> hard to open.....)

I found Rohm BU6574FV is a AFE  after short research.
that is single channel 16bit CIS/CCD Analog Front End.


That looks compatible with Holtek HT82V42 and Wolfson WM8253.

Ref: http://www.holtek.com/english/tech/faq/CCD-CISAnalog.htm#1-3

There are no public datasheet for BU6574 but we can get it for WM8253.


You can see same functional diagram with BU6574FV.

This  may   help us to implement a driver for LiDE90.


> sane-Bugs item #313692, was changed at 02/07/2012 22:30 by Stéphane Voltz
> You can respond by visiting: 
> https://alioth.debian.org/tracker/?func=detail&atid=410366&aid=313692&group_id=30186
> Initial Comment:
> I found a hard work in 2008 in sane-devel ML.
> I'd like to request to support CanoScan LiDE90 scanner.
> Attachment is a  pactch that is intend to port original work at
> http://old.nabble.com/Canon-LiDE-90-to14851446.html
> I can see that my scanner head move a little for calibration but not working.
> it will be a start point for you.
> ----------------------------------------------------------------------
>> Comment By: Stéphane Voltz (stefdev-guest)
> Date: 02/07/2012 22:30
> Message:
> This bug report will keep the code so someone with this scanner will be able to use it to bring support. Which I cannot do without a test device.
> ----------------------------------------------------------------------

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