2.5.2.3 EEPROM Control Circuits
The EEPROM of EPSON Stylus Scan 2000 has following contents. Gate array controls
operations of reading data when the power is on and writing data when the power is
off.
n Ink consumption (Bk, CMY)
n CL counter (Various cleaning operations that are previously done are memorized)
n Destination information
n Information of various adjustment values (Bi-D, VH voltage, etc.)
n CPSI pass word
n Other various setting values by the user
EEPROM is connected to the Gate array by 4 lines and performs following functions.
The figure below shows EEPROM control circuit.
n CS: Chip selection signal
n CK: Data synchronism clock pulse
n DI: Data writing line (serial data) at power off.
n DO: Data reading line (serial data) at power on.
Figure 2-28. EEPROM Control Circuits
+5V
8
6
5
AT93C46
(IC7)
Vcc
ORG
GND
CS
SK
DI
DO
124
125
126
123
EECS
EECK
EECO
EECI
E05B588
(IC2)
1
2
3
4
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