收藏本站
24C08B/16B
2.0
FUNCTIONAL DESCRIPTION
3.4
Data Valid (D)
The 24C08B/16B supports a Bi-directional 2-wire bus
and data transmission protocol. A device that sends
data onto the bus is defined as transmitter, and a
device receiving data as receiver. The bus has to be
controlled by a master device which generates the
serial clock (SCL), controls the bus access, and gener-
ates the START and STOP conditions, while the
24C08B/16B works as slave. Both, master and slave
can operate as transmitter or receiver but the master
device determines which mode is activated.
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal.
The data on the line must be changed during the LOW
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a START condition
and terminated with a STOP condition. The number of
the data bytes transferred between the START and
3.0
BUS CHARACTERISTICS
STOP conditions is determined by the master device
and is theoretically unlimited, although only the last 16
The following bus protocol has been defined:
? Data transfer may be initiated only when the bus
is not busy.
will be stored when doing a write operation. When an
overwrite does occur it will replace data in a first in first
out fashion.
? During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
3.5
Acknowledge
in the data line while the clock line is HIGH will be
interpreted as a START or STOP condition.
Accordingly, the following bus conditions have been
defined (Figure 3-1).
Each receiving device, when addressed, is obliged to
generate an acknowledge after the reception of each
byte. The master device must generate an extra clock
pulse which is associated with this acknowledge bit.
3.1
Bus not Busy (A)
Note:
The 24C08B/16B does not generate any
acknowledge bits if an internal program-
Both data and clock lines remain HIGH.
ming cycle is in progress.
The device that acknowledges, has to pull down the
3.2
Start Data Transfer (B)
SDA line during the acknowledge clock pulse in such a
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition.
All commands must be preceded by a START condi-
tion.
way that the SDA line is stable LOW during the HIGH
period of the acknowledge related clock pulse. Of
course, setup and hold times must be taken into
account. During reads, a master must signal an end of
data to the slave by NOT generating an acknowledge
3.3
Stop Data Transfer (C)
bit on the last byte that has been clocked out of the
slave. In this case, the slave (24C08B/16B) will leave
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations must be ended with a STOP condition.
the data line HIGH to enable the master to generate the
STOP condition.
FIGURE 3-1:
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(A)
(B)
(D)
(D)
(C)
(A)
SCL
SDA
START
CONDITION
ADDRESS OR
ACKNOWLEDGE
DATA
ALLOWED
STOP
CONDITION
DS21081G-page 4
VALID
TO CHANGE
? 2004 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
24FC1026-I/P IC EEPROM 1024KB 1MHZ 8-DIP
24FC128-I/MNY IC EEPROM 128KBIT 1MHZ 8TDFN
24FC515T-I/SM IC EEPROM 512KBIT 1MHZ 8SOIC
24FC64T-I/MF IC EEPROM 64KBIT 1MHZ 8DFN
24LC014H-I/P IC EEPROM 1KBIT 400KHZ 8DIP
24LC014T-E/OT IC EEPROM 1KBIT 400KHZ SOT23-6
24LC01B-I/SNG IC EEPROM 1KBIT 400KHZ 8SOIC
24LC024H-I/ST IC EEPROM 2KBIT 400KHZ 8TSSOP
相关代理商/技术参数
24C08B-E/SL 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM
24C08B-E/SN 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM
24C08B-EP 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8K/16K 5.0V I 2 C O Serial EEPROMs
24C08B-ESL 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8K/16K 5.0V I 2 C O Serial EEPROMs
24C08B-ESN 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8K/16K 5.0V I 2 C O Serial EEPROMs
24C08B-I/P 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM
24C08B-I/SL 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM
24C08B-I/SN 制造商:未知厂家 制造商全称:未知厂家 功能描述:I2C Serial EEPROM