s-24c02ci-t8t1u Seiko Instruments Inc., s-24c02ci-t8t1u Datasheet - Page 15

• Manufacturer Part Number: s-24c02ci-t8t1u
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Rev.2.0
SDA LINE
6. 3 Write Protection
WP
Write protection is available in the S-24C01C/02C. When the WP pin is connected to the V
memory area is forbidden at all.
When the WP pin is connected to GND or set in high impedance, the write protection 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 protection, refer to Figure 8.
In not using the write protection, connect the WP pin to GND or set it open. The write protection is valid in the
range of operation power supply voltage.
As seen in Figure 16 when the write protection is valid, the S-24C01C/02C does not generate an
acknowledgment signal after data input.
*1. In the S-24C01C, setting W7 is arbitrary.
_00_C
S
T
A
R
T
M
S
B
1 0 1 0
ADDRESS
DEVICE
A2 A1 A0
S
B
L
W
W
R
R
E
T
0
/
I
Figure 16 Write Protection
C
A
K
W7 W6 W5 W4 W3 W2 W1 W0
Seiko Instruments Inc.
*1
WORD ADDRESS
2-WIRE CMOS SERIAL E
A
C
K
A
C
K
D7 D6 D5 D4 D3 D2 D1 D0
DATA
CC
S-24C01C/02C
, write operation to
N
A
C
K
O
S
T
P
2
PROM
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