16
March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 REVERSING AUTOMATIC DOCUMENT FEEDER (RADF)
16 - 79
9) Analog multiplexer circuit
Fig.16-102
This is a circuit to connect to COM with one of the four analog input signals. As following table
shows, the digital signals input into IC7-11 pin (A), IC7-10 pin (B) and IC7-9 pin (C) switch the corre-
sponding channels and IC7-3 pin (COM) at a high speed, and they are input into the A-D input termi-
nal of CPU. Each channel signal is an analog output signal of the reflective sensor and used to
adjust the sensor automatically.
C B A Corresponding channel
L L L 0
L L H 1
L H L 2
L H H 3
To Next Page
Loading...
