AT24CSW04X) or 10-bit (in the case of the AT24CSW08X) memory array word address and is used to specify

which byte location in the EEPROM to start reading or writing. Refer to Table 6-5 to review these bit positions.

When accessing the Security register, it is required that the A7 and A6 bits of the word address be set to '10'

respectively. These bits are at a higher order address range than what is needed to address the 32‑byte space

(A4 through A0). It is recommended that all address bits that fall outside the address range that do not have other

requirements be set to a logic '0'.

Table 6-5. Word Address Byte

Device

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

EEPROM Array

A7

A6

A5

A4

A3

A2

A1

A0

Security Register

1

0

X

A4

A3

A2

A1

A0

Security Register Lock Function

0

1

1

0

X

X

X

X

Write Protection Register

1

1

X

X

X

X

X

X

AT24CSW04X/AT24CSW08X

Memory Organization

and its subsidiaries

Datasheet

DS20006426B-page 18