24LC64T-E/SM Microchip Technology, 24LC64T-E/SM Datasheet - Page 7

• Manufacturer Part Number: 24LC64T-E/SM
• Description: IC EEPROM 64KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LC64T-E/SM

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 64K (8K x 8)
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 24LC64TE/SM

5.0
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
The control byte consists of a four-bit control code. For
the 24XX64, this is set as ‘1010’ binary for read and
write operations. The next three bits of the control byte
are the Chip Select bits (A2, A1, A0). The Chip Select
bits allow the use of up to eight 24XX64 devices on the
same bus and are used to 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 and Chip Scale packages, the address
pins are not available. During device addressing, the
A2, A1 and A0 Chip Select bits (Figure 5-2) 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. The next two bytes received define the
address of the first data byte (Figure 5-2). Because
only A12...A0 are used, the upper-three address bits
are “don’t care” bits. The upper-address bits are
transferred first, followed by the Less Significant bits.
Following the Start condition, the 24XX64 monitors the
SDA bus, checking the device-type identifier being
transmitted. Upon receiving a ‘1010’ code and appro-
priate device-select bits, the slave device outputs an
FIGURE 5-2:
 2010 Microchip Technology Inc.
1
DEVICE ADDRESSING
Control
Code
0
1
Control Byte
0
A
2
ADDRESS SEQUENCE BIT ASSIGNMENTS
Select
Chip
bits
A
1
A
0 R/W
x
x
Address High Byte
x
24AA64/24LC64/24FC64
12
A
11
A
Acknowledge signal on the SDA line. Depending on the
state of the R/W bit, the 24XX64 will select a read or
write operation.
FIGURE 5-1:
5.1
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 512K
bits by adding up to eight 24XX64 devices on the same
bus. In this case, software can use A0 of the control
byte as address bit A13; A1 as address bit A14; and A2
as address bit A15. It is not possible to sequentially
read across device boundaries.
The SOT-23 and Chip Scale packages do not support
multiple device addressing on the same bus.
10
A
Start Bit
A
9
S
A
8
Contiguous Addressing Across
Multiple Devices
1
Control Code
0
A
7
Slave Address
1
•
CONTROL BYTE FORMAT
Address Low Byte
0
•
Read/Write Bit
A2
Chip Select
•
Acknowledge Bit
Bits
•
A1
x = “don’t care” bit
DS21189R-page 7
•
A0
•
R/W
A
0
ACK