X24Cxx Eeprom device addresses


The most important columns with respect to device addresses in the table are:

a. The hardwired address pins (only important for the smaller types: there can be more than 1 X24Cxx on the bus).
b. The Device Write and Read Address: these reflect the “device number” and the “bank number”.
c. The Word Address: this reflects the address of the eeprom byte to write or read within a bank.

Type Bytes
per
device
Hardwired
Address
Pins (1)
Device
Number (2)
Bank
Number (3)
Device
Write
Address
Device
Read
Address
Word
Address (4)
X24C02 256 A2=0, A1=0, A0=0 0 0 $A0 $A1 $00-$FF
A2=0, A1=0, A0=1 1 0 $A2 $A3 $00-$FF
A2=0, A1=1, A0=0 2 0 $A4 $A5 $00-$FF
A2=0, A1=1, A0=1 3 0 $A6 $A7 $00-$FF
A2=1, A1=0, A0=0 4 0 $A8 $A9 $00-$FF
A2=1, A1=0, A0=1 5 0 $AA $AB $00-$FF
A2=1, A1=1, A0=0 6 0 $AC $AD $00-$FF
A2=1, A1=1, A0=1 7 0 $AE $AF $00-$FF
X24C04 512 A2=0, A1=0 0 0 $A0 $A1 $00-$FF
1 $A2 $A3 $00-$FF
A2=0, A1=1 1 0 $A4 $A5 $00-$FF
1 $A6 $A7 $00-$FF
A2=1, A1=0 2 0 $A8 $A9 $00-$FF
1 $AA $AB $00-$FF
A2=1, A1=1 3 0 $AC $AD $00-$FF
1 $AE $AF $00-$FF
X24C08 1024 A2=0 0 0 $A0 $A1 $00-$FF
1 $A2 $A3 $00-$FF
2 $A4 $A5 $00-$FF
3 $A6 $A7 $00-$FF
A2=1 1 0 $A8 $A9 $00-$FF
1 $AA $AB $00-$FF
2 $AC $AD $00-$FF
3 $AE $AF $00-$FF
X24C16 2048 none 0 0 $A0 $A1 $00-$FF
1 $A2 $A3 $00-$FF
2 $A4 $A5 $00-$FF
3 $A6 $A7 $00-$FF
4 $A8 $A9 $00-$FF
5 $AA $AB $00-$FF
6 $AC $AD $00-$FF
7 $AE $AF $00-$FF
(1) These device pins permit to connect more than one X24Cxx devices to one I2c bus. E.g.: Of the X24C02 there can be maximum 8 devices (0..7) connected to the bus. The wiring of A2..A0 (connected to ground -0- or Vcc -1-) defines which addresses the device will respond to.
(2) This is the “device number” of a device on the bus. It is determined by the previous column (Hardwired Address pins).
(3) This is the “Bank number” inside a device. Each bank is 256 bytes big.
(4) The “Word address” is the range of byte addresses within 1 bank.


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