Eeprom Control Circuit - Epson Stylus COLOR 670 Service Manual

EPSON Stylus COLOR 670

2.2.2.6 EEPROM Control Circuit

Since EEPROM is nonvolatile memory, it keeps written information if the
printer power is turned off. When the printer is turned ON, ASIC reads data
from EEPROM (IC6) and when the power is turned OFF it stores data to
EEPROM.
Information stored in EEPROM is listed below.
n
Various ink counter (I/C consumption counter, waste pad counter,
etc.)
n
Mechanical setting value (Head ID, Bi-D adjustment, USB ID, etc.)
n
Destination data (printable area setting, CG setting, etc.)
n
Option setting (CPSI password, etc.)
See Appendix for EEPROM Address Map that provides detailed information
on the values stored in EEPROM.
AT93C46
+5V
(IC6)
8
Vcc
C S
6
SK
O R G
5
G N D D I
D O
Figure 2-18. EEPROM Circuit Diagram
Operating Principles
E05B58**
(IC2)
1 206
EEC S
2 205
EEC K
3 204
EEC O
203
4
EEC I
Electrical Circuit Operating Principles
EEPROM is connected to ASIC with 4 lines and each line has the following
function.
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.
Revision A
50