s-24c32c Seiko Instruments Inc., s-24c32c Datasheet - Page 15

• Manufacturer Part Number: s-24c32c
• Description: 2-wire Serial Eeprom S-24c32c/64c 32k/64k-bit
• Manufacturer: Seiko Instruments Inc.

SDA LINE
Rev.2.0
WP
6. 3 Write Protect
Write protect is available in the S-24C32C/64C. When the WP pin is connected to the V
memory area is inhibited.
When the WP pin is connected to GND or set in high impedance, 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-24C32C/64C does not generate an acknowledgment
signal after data input.
Remark W12 is arbitrary in the S-24C32C.
_00_H
S
A
R
T
T
M
S
B
1 0 1 0
ADDRESS
DEVICE
A2 A1 A0
S
B
L
W
W
R
R
T
E
0
/
I
C
A
K
X
WORD ADDRESS
X
X
UPPER
W12 W11 W10 W9 W8
Figure 16 Write Protect
Seiko Instruments Inc.
A
C
K
W7 W6 W5 W4 W3 W2 W1 W0
LOWER WORD
ADDRESS
2-WIRE CMOS SERIAL E
A
C
K
D7 D6 D5 D4 D3 D2 D1 D0
DATA
CC
, write operation to
S-24C32C/64C
2
N
C
A
K
PROM
O
S
T
P
15