参数资料
| 型号： | 24AA08H-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 8KBIT 400KHZ 8TSSOP |
| 产品培训模块： | I2C Serial EEPROM |
| 标准包装： | 100 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 8K (4 x 256 x 8) |
| 速度： | 100kHz，400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°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： | 管件 |
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24AA08H/24LC08BH
4.0
WRITE OPERATION
4.2
Page Write
4.1
Byte Write
The write control byte, word address and the first data
byte are transmitted to the 24XX08H in the same way
Following the Start condition from the master, the
device code (4 bits), the block address (3 bits) and the
R/W bit, which is a logic-low, is placed onto the bus by
the master transmitter. This indicates to the addressed
slave receiver that a byte with a word address will
follow once it has generated an Acknowledge bit during
the ninth clock cycle. Therefore, the next byte transmit-
ted by the master is the word address and will be
written into the Address Pointer of the 24XX08H. After
receiving another Acknowledge signal from the
24XX08H, the master device will transmit the data word
to be written into the addressed memory location. The
24XX08H acknowledges again and the master
generates a Stop condition. This initiates the internal
as in a byte write. However, instead of generating a
Stop condition, the master transmits up to 16 data bytes
to the 24XX08H, which are temporarily stored in the on-
chip page buffer and will be written into memory once
the master has transmitted a Stop condition. Upon
receipt of each word, the four lower-order Address
Pointer bits are internally incremented by ‘ 1 ’. The
higher-order 7 bits of the word address remain
constant. If the master should transmit more than 16
words prior to generating the Stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the Stop condition is received an
internal write cycle will begin (Figure 4-2).
write cycle and, during this time, the 24XX08H will not
generate Acknowledge signals (Figure 4-1).
FIGURE 4-1:
BYTE WRITE
Note:
Page write operations are limited to writing
bytes within a single physical page,
regardless of the number of bytes
actually being written. Physical page
boundaries start at addresses that are
integer multiples of the page buffer size (or
‘page-size’) and end at addresses that are
integer multiples of [page size – 1]. If a
Page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page, as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
Bus Activity
Master
S
T
A
R
T
Control
Byte
Word
Address
Data
S
T
O
P
SDA Line
S 1 0 1 0 X B1 B0 0
P
Bus Activity
x = “don’t care”
Block
Select
Bits
A
C
K
A
C
K
A
C
K
FIGURE 4-2:
PAGE WRITE
Bus Activity
Master
S
T
A
R
T
Control
Byte
Word
Address (n)
Data (n)
Data (n + 1)
Data (n + 15)
S
T
O
P
SDA Line
S 1 0 1 0 X B1B0 0
P
Bus Activity
x = “don’t care”
Block
Select
Bits
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
? 2008 Microchip Technology Inc.
DS22084A-page 7
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相关代理商/技术参数 |
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| 24AA08HT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8K I2C? Serial EEPROM with Half-Array Write-Protect |
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