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AT24C02 is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with
256 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal
for IC2 are as shown in the following diagram.
TOP VIEW
A0
1
2
A1
A2
3
VSS
4
Pin No.
Signal
1-3
A0-A2
4
VSS
5
SDA
6
SCL
7
TEST
8
VCC
When the memory IC (IC2) or control unit is exchanged, input the relay timing to the memory IC (IC2), referring to the
"how to input the relay timing". Otherwise the oven will make a big noise when starting.
How to input the relay timing
PAD
(Door close)
CHECK
CHECK
SIGNAL
SIGNAL
DOUBLE
QUANTITY
7
(after 1 sec.)
SET
3,8,4,9
SET
CHECK
2-2 Memory IC (IC2)
VCC
8
TEST
7
6
SCL
SDA
5
Table 1. Relation between Pin Nos, and Signals
I/O
IN
Connected to +5V.
IN
Connected to GND.
IN/OUT
Serial data input/output : input/outputs data to IC1.
IN
Clock signal input : input/outputs sireal data at every one pulse.
IN
Connected to GND.
IN
Connected to +5V.
DISPLAY
.
.
.
82 68
(user total count)
34 56
(service total count upper figure 3456XX)
7
38 69
0
38 49
38 49
.
FUNCTIONAL DIAGRAM
(3) Vcc
(4) Vss
(5) SDA
START
STOP
LOGIC
SLAVE ADDRESS
REGISTER
(6) SCL
COMPARATOR
LOAD
ADDRESS
COUNTER
R/W
Dout
ACK
Description
... Flashing /
... 0.1sec BUZZER
INDICATOR
CHECK
No.
CHECK
No.
19
H.V. GENERATION
START CYCLE
TIMING
& CONTROL
CONTROL
LOGIC
2
E PROM
64
512 x 8
XDEC
INC
WORD
1
64
5
3
YDEC
8
CK
Dout
PIN
DATA REGISTER
PHONE
x 4
R-15AT
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