参数资料
型号: 24VL025T/ST
厂商: Microchip Technology
文件页数: 8/30页
文件大小: 0K
描述: IC EEPROM 2KBIT 400KHZ 8TSSOP
标准包装: 2,500
格式 - 存储器: EEPROMs - 串行
存储器类型: EEPROM
存储容量: 2K (256 x 8)
速度: 100kHz,400kHz
接口: I²C,2 线串口
电源电压: 1.5 V ~ 3.6 V
工作温度: -20°C ~ 85°C
封装/外壳: 8-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 8-TSSOP
包装: 带卷 (TR)
24VL024/24VL025
5.0
DEVICE ADDRESSING
FIGURE 5-1:
CONTROL BYTE FORMAT
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
Read/Write Bit
The control byte consists of a four-bit control code; for
the 24VL024/24VL025 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 24VL024/
24VL025 devices on the same bus and are used to
select which device is accessed. The Chip Select bits
Slave Address
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.
Start Bit
5.1
Acknowledge Bit
Contiguous Addressing Across
For the SOT-23 package, the A2 pin is not connected.
During device addressing, the A2 chip select bit should
be set to logic ‘ 0 ’. Only four 24VL025 SOT-23 devices
can be connected to the same bus.
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 24VL024/
24VL025 monitors the SDA bus, checking the control
byte being transmitted. Upon receiving a ‘ 1010 ’ code
and appropriate Chip Select bits, the slave device
outputs an Acknowledge signal on the SDA line.
Depending on the state of the R/W bit, the 24VL024/
24VL025 will select a read or write operation.
DS22130A-page 8
Multiple Devices
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 16K bits
by adding up to eight 24VL024/24VL025 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 devices can be
added for up to 8K 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. Bit A2 of the control byte
must always be set to logic ‘ 0 ’ for the SOT-23 package.
? 2009 Microchip Technology Inc.
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