AK6002A Datasheet, PDF (3/18 Pages) Asahi Kasei Microsystems – I2C BUS 2K/4K/16K BIT SERIAL CMOS EEPROM

ASAHI KASEI
[AK6002A/04A/08A]

DATA TRANSFER
All commands are preceded by a START condition. After the START condition, a slave address is
sent. After the AK6002A/04A/08A recognizes the START condition, the devices interfaced to the
bus wait for the slave address to be transmitted over the SDA line. If the transmitted slave address
matches an address of one of the devices, the designated slave pulls the SDA line to LOW
(ACKNOWLEDGE) .
The data transfer is always terminated by a STOP condition generated by the master.
[ Data validity ]
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW
state of the data line can only change when the clock signal on the SCL line is LOW.
Figure1. Data transfer
[ START and STOP condition]
A HIGH to LOW transition on the SDA line while SCL is HIGH defines a START condition. All
commands are preceded by the START condition.
A LOW to HIGH transition on the SDA line while SCL is HIGH defines a STOP condition. All
communications are terminated by the STOP condition. After a read sequence, the STOP condition
will place the EEPROM in a standby power mode.
Figure2. Start and STOP Definition
DAI01E-01
-3-
1999/10