LE2416RDXA Datasheet, PDF (9/17 Pages) ON Semiconductor – 16 kb I2C CMOS Serial EEPROM

LE2416RDXA
4) Acknowledge Bit (ACK)
The Acknowledge Bit is used to indicate a successful byte data transfer. The receiver sends a zero to
acknowledge that it has received each word (Device Code, Slave Address etc) from the transmitter.
SCL
(From Transmitter)
1
8
9
SDA
(From Transmitter)
SDA
(EEPROM output)
Start
condition
Acknowledge
Bit output
t_AA
t_DH
5) Device addressing
To transmit between the bus master and slave device (EEPROM), the master must send a Start condition
to the EEPROM. The device address word of the EEPROM consists of 4-bit Device Code, 3-bit Memory
address and 1-bit read/write code. By sending these, it becomes possible to communicate between the
bus master and the EEPROM.
The upper 4-bit of the device address word are called the Device Code, the Device Code of the EEPROM
uses 1010b fixed code. This device does not have the Slave address.
When the Device Code and Memory address (A10, A9, A8) are received on the SDA, the device only
responds. The 8^th bit is the read/write bit. The bit is set to 1 for Read operation and 0 for Write operation.
If a match occurs on the Device Code, the corresponding device gives an acknowledgement on SDA
during the 9^th bit time. If device does not match the Device Code, it deselects itself from the bus, and goes
into the Standby mode.
Device Code
Memory
Address
1
MSB
0
1
0 A10 A9 A8 R/W
LSB
Device address word
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