gl846 Genesys Logic, gl846 Datasheet - Page 90

• Manufacturer Part Number: gl846
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Fast Adf
• Manufacturer: Genesys Logic

of stagger CCD together.
39 Fine CDS Sampling Adjustment
Designers can fine-tune the CDS sampling position to avoid the digital noise influence (8.33ns adjustment).
The image noise may come from the digital noise of PCB.
40 Wall-Hitting Protection
Designers can use table five of motor moving to protect the wall hitting. The LONGCURV control bit has to
be set to logic ‘1’ to enable the long-curve function. The first several steps are used to decelerate the carriage
moving; the other slower steps are focused on touching the home sensor.
Due to the special table five, designers can replace the photo-sensor by simple, cheaper mechanical-type sensors.
41 Motor Driver IC Setting
Designers add pull up/pull down resistors on MTR_SEL0~2 will indicate ASIC to generate the timing of
specified motor driver IC.
Motor type select : CCD_TGB
When designers select MTR_SEL0~2 to “111”, MT_PH0~7 will output phase table which is stored in internal
RAM.
42 Operation Mode Setting
Designers add pull down resistors on TSTSEL0~3 will indicate ASIC to work on normal mode.
ASIC mode select : CCD_CK3X
43 Support MCU with SPI interfaces for special application
GL846 can be as an external MCU SPI slave to receive any command and data from MCU which is as a SPI
master.
©2000-2007 Genesys Logic Inc. - All rights reserved.
SPI Slave
GL846
GL846 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF
CCD_TGG
CCD_CK4X
CCD_RSX
CCD_CK2X
CCD_TGX
MTR_SEL2
MTR_SEL1
MTR_SEL0
TSTSEL3
TSTSEL2
TSTSEL1
TSTSEL0
SPI BUS
SPI Master
MCU
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