s-24c04c Seiko Instruments Inc., s-24c04c Datasheet - Page 15

• Manufacturer Part Number: s-24c04c
• Description: 2-wire Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Rev.2.0
SDA LINE
6. 3 Write protect
WP
Write protect is available in the S-24C04C. When the WP pin is connected to the V
area is forbidden at all.
When the WP pin is connected to GND or set in open, the write protect is invalid, and write operation in all
memory area is available.
Fix the level of the WP pin from start condition in the write operation (byte write, page write) until stop condition. If
the WP pin changes during this time, the address data being written at this time is not guaranteed. Regarding the
timing of write protect, refer to Figure 8.
In not using the write protect, connect the WP pin to GND or set it open. The write protect is valid in the range of
operation power supply voltage.
As seen in Figure 16 when the write protect is valid, the S-24C04C does not generate an acknowledgment signal
after data input.
_00_C
R
S
T
A
T
M
S
B
1 0 1 0
ADDRESS
DEVICE
A2 A1 P0
S
B
L
W
W
R
R
T
E
0
/
I
A
C
K
Figure 16 Write Protect
W7 W6 W5 W4 W3 W2 W1 W0
Seiko Instruments Inc.
WORD ADDRESS
A
C
K
A
C
K
D7 D6 D5 D4 D3 D2 D1 D0
2-WIRE SERIAL E
DATA
CC
, write operation to memory
N
C
A
K
S-24C04C
O
S
T
P
2
PROM
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