Ccd Control Circuit - Toshiba e-STUDIO182 Service Manual

6.5.2

CCD control circuit

On the contact image sensor (CIS) unit, CCD (Charge Coupled Device) is mounted as the
optoelectronic element for converting the light reflected on the original into electrical signals (analog
signals). CCD is driven by the clock signals output from the SoC on the MAIN board, and then it divides
the photoelectric-converted analog signals into four output signals and outputs to the AFE. The AFE
converts the analog signals into 8-bit digital signals and outputs to the SoC.
MAIN board
SH
CK2B
RS
IMGDTA[0]
IMGDTA[1]
SoC
IMGDTA[2]
IMGDTA[3]
IMGDTA[4]
IMGDTA[5]
IMGDTA[6]
IMGDTA[7]
© 2009 TOSHIBA TEC CORPORATION All rights reserved
+5V
TRCLCK
MCLCK
RSCLCK
SCNIMGA[0]
SCNIMGA[1]
SCNIMGA[2]
SCNIMGA[3]
AFE
SCNIMGA[4]
SCNIMGA[5]
SCNIMGA[6]
SCNIMGA[7]
Fig. 6-5
6 - 9
Contact image sensor unit
CCD
CDIN1
CDIN2
CDIN3
CDIN4
e-STUDIO182/212/242
SCANNER
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