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24AA014/24LC014
5.0
DEVICE ADDRESSING
FIGURE 5-1:
CONTROL BYTE FORMAT
A control byte is the first byte received following the
Read/Write Bit
Start condition from the master device ( Figure 5-1 ).
The control byte consists of a four-bit control code; for
the 24AA014/24LC014 this is set as ‘ 1010 ’ binary for
read and write operations. The next three bits of the
Control Code
Chip Select
Bits
control byte are the Chip Select bits (A2, A1, A0). The
S
1
0
1
0
A2
A1
A0 R/W ACK
Chip Select bits allow the use of up to eight 24AA014/
24LC014 devices on the same bus and are used to
Slave Address
select which device is accessed. The Chip Select bits
in the control byte must correspond to the logic levels
on the corresponding A2, A1 and A0 pins for the device
to respond. These bits are in effect the three Most
Significant bits of the word address.
For the SOT-23 package, the A2 address pin is not
Start Bit
5.1
Acknowledge Bit
Contiguous Addressing Across
Multiple Devices
available. During device addressing, the A2 Chip
Select bit should be set to ‘ 0 ’.
The last bit of the control byte defines the operation to
be performed. When set to a ‘ 1 ’, a read operation is
selected. When set to a ‘ 0 ’, a write operation is
selected. Following the Start condition, the 24AA014/
24LC014 monitors the SDA bus, checking the control
byte being transmitted. Upon receiving a ‘ 1010 ’ code
and appropriate Chip Select bits, the slave device out-
puts an Acknowledge signal on the SDA line. Depend-
ing on the state of the R/W bit, the 24AA014/24LC014
will select a read or write operation.
? 2010 Microchip Technology Inc.
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 8K bits
by adding up to eight 24AA014/24LC014 devices on
the same bus. In this case, software can use A0 of the
control byte as address bit A8, A1 as address bit A9,
and A2 as address bit A10. It is not possible to
sequentially read across device boundaries.
For the SOT-23 package, up to four 24AA014/24LC014
devices can be added for up to 4K bits of address
space. In this case, software can use A0 of the control
byte as address bit A8, and A1 as address bit A9. It is
not possible to sequentially read across device bound-
aries.
DS21809G-page 7
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