le24c043 ON Semiconductor, le24c043 Datasheet - Page 7

• Manufacturer Part Number: le24c043
• Description: Cmos Ic Two Wire Serial Interface Eeprom 4k Eeprom
• Manufacturer: ON Semiconductor

5 Device addressing
For the purposes of communication, the master device in the system generates the start condition for the slave device.
Communication with a particular slave device is enabled by sending along the SDA bus the device address, which is
7-bits long, and the read/write command code, which is 1 bit long, immediately following the start condition.
The upper four bits of the device address are called the device code which, for this product, is fixed as “1010.” This
device has the upper 2-bit of the Slave Device address as the Slave address (S1, S2), which fixed on the inside. The
value of Slave address are S1=0, S2=0.
When the device code input from SDA and the slave addresses are compared with the product’s device code and slave
addresses that were set at the mounting stage and found to match, the product sends the acknowledge signal during
the ninth clock cycle period, and initiates the read or write operation in accordance with the read or write command
code. If they do not match, the EEPROM returns to standby mode. When a read operation is performed immediately
after the slave device has been switched, the random read command must be used.
MSB
1
Device Code
0
1
LE24C043
Device address word
0
S2
Address
Slave
S1
A8
Memory
Address
R/W
LSB
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