S-24C02DI-J8T1U5 Datasheet, PDF (16/47 Pages) Seiko Instruments Inc – Write protect function during low power supply voltage

2-WIRE SERIAL E²PROM
S-24C02D/04D/08D16D
Rev.3.0_01_U
7. 3 Write protect
Write protect is available in this IC. When the WP pin is connected to the VCC pin, write operation to memory area
is forbidden at all.
When the WP pin is connected to the GND pin 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 3 Write Cycle Timing".
When not using the write protect, connect the WP pin to the GND pin or set in open. The write protect is valid in
the range of operation power supply voltage.
As seen in Figure 11 when the write protect is valid, this IC does not generate an acknowledgel after data input.
S
W
T
R
A
I
R
T
DEVICE
ADDRESS
T
E
WORD ADDRESS
S
T
O
DATA
P
SDA LINE
WP
1 0 1 0 _{A2 A1 A0} 0 _{W7 W6 W5 W4 W3 W2 W1 W0 D7 D6 D5 D4 D3 D2 D1 D0}
M
LR A
S
S/ C
B
BW K
A_A
C_C
K_K
N
A
C
K
Remark A0 is P0 in the S-24C04D/08D/16D.
A1 is P1 in the S-24C08D/16D.
A2 is P2 in the S-24C16D.
Set A0, A1, A2 to "0" in the product with SOT-23-5 package.
Figure 11 Write Protect
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