R1EV24004ASAS0I_15 Datasheet, PDF (8/17 Pages) Renesas Technology Corp – Two-wire serial interface 4k EEPROM (512-word  8-bit)

R1EV24004ASAS0I
Device Addressing
The EEPROM device requires an 8-bit device address word following a start condition to enable the chip for a read or a
write operation. The device address word consists of 4-bit device code, 3-bit device address code and 1-bit
read/write(R/W) code. The most significant 4-bit of the device address word are used to distinguish device type and
this EEPROM uses “1010” fixed code. The device address word is followed by the 2-bit device address code A2, A1
memory adderess a8. The device address code selects one device out of four devices which are connected to the bus.
This means that the device is selected if the inputted 2-bit device address code are equal to the corresponding hard-
wired A2 , A1 pin status.
The eighth bit of the device address word is the read/write(R/W) bit. A write operation is initiated if this bit is “0” and
a read operation is initiated if this bit is “1” . The EEPROM turns to a stand-by state if the device code is not “1010” or
device address code doesn’t coincide with status of the correspond hard-wired device address pins A2 to A0.
Device Address Word
Device code (fixed)
4k
1
0
1
Note: 1. R/W=“1” is read and R/W = “0” is write.
Device address word (8-bit)
Device address code
0
A2
A1
a8
R/W code*¹
R/W
R10DS0123EJ0100 Rev.1.00
Apr. 08, 2013
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