Ccd Control Circuit - Toshiba e-STUDIO167 Service Manual

6.5.2

CCD control circuit

On the contact image sensor (CIS) unit, CCD (Charge Coupled Device) with 7,084 effective pixels are
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 (TRCLCK, MCLCK, RSCLCK) output from
the SoC on the MAIN board, and then it divides the photoelectric-converted analog signals into four out-
put signals (CDIN0 to 3) and outputs to the AFE. The AFE converts the analog signals into 8-bit digital
signals (SCNIMGA [0] to [7]) 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]
© February 2007 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-STUDIO167/207/237
SCANNER
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