Datasheet > MC74

MC74

更新时间： 2022-11-26 15:22:55

品牌	Logo	应用领域
安森美 - ONSEMI		传感器温度传感器
页数	文件大小	规格书
12页	126K
描述
Serial Digital Temperature Sensor

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中文翻译

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数据手册

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MC74 数据手册

MC74

Write Byte Format

ADDRESS

ACK

COMMAND

8 Bits

DATA

7 Bits

8 Bits

Slave Address

Command Byte: selects

which register you are

writing to.

Data Byte: data goes

into the register set

by the command byte.

Read Byte Format

ADDRESS WR ACK

COMMAND ACK

ADDRESS RD ACK

DATA NACK

7 Bits

8 Bits

7 Bits

8 Bits

Slave Address

Command Byte: selects

which register you are

reading from.

Slave Address: repeated

due to change in data–

flow direction.

Data Byte: reads from

the register set by the

command byte.

Receive Byte Format

ADDRESS RD ACK

7 Bits

DATA NACK

8 Bits

Data Byte: reads data from

the register commanded by

the last Read Byte.

S = Start Condition

P = Stop Condition

Shaded = Slave Transmission

Figure 1. SMBus Protocols

Acknowledge (ACK)

Start Condition (START)

The MC74 continuously monitors the SDA and SCL lines

for a start condition (a HIGH to LOW transition of SDA

whileSCLisHIGH)andwillnotresponduntilthiscondition

is met.

Acknowledge (ACK) provides a positive handshake

betweenthehostandtheMC74. ThehostreleasesSDAafter

transmitting eight bits, then generates a ninth clock cycle to

allow the MC74 to pull the SDA line LOW to acknowledge

that it successfully received the previous eight bits of data or

address.

Address Byte

Immediately following the Start Condition, the host must

transmit the address byte to the MC74. The states of A1 and

A0 determine the 7–bit SMBus address for the MC74. The

7–bit address transmitted in the serial bit stream must match

for the MC74 to respond with an Acknowledge (indicating

the MC74 is on the bus and ready to accept data). The eighth

bit in the Address Byte is a Read–Write Bit. This bit is a 1

for a read operation or 0 for a write operation. During the

first phase of any transfer this bit will be set = 0 to indicate

that the command byte is being written.

Data Byte

After a successful ACK of the address byte, the host must

transmit the data byte to be written or clock out the data to

be read. (See the appropriate timing diagrams. ) ACK will

be generated after a successful write of a data byte into the

MC74.

Stop Condition (STOP)

Communications must be terminated by a stop condition

(a LOW to HIGH transition of SDA while SCL is HIGH).

The Stop Condition must be communicated by the

transmitter to the MC74. NOTE: Refer to Timing Diagrams

for serial bus timing.

http://onsemi.com

1 2 3 456 7 8...12

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与MC74相关器件

型号	品牌	获取价格	描述	数据表
MC7400	ONSEMI	获取价格	Single Supply Quad Comparators
MC7400	FREESCALE	获取价格	N-Channel 20V (D-S) MOSFET High performance trench technology
MC-7400	MOXA	获取价格	IntelÂ® 6th Gen Coreâ¢ CPU marine computer w
MC74005N	ETC	获取价格	8-function calculator unit co-operating with LED display
MC74007N	ETC	获取价格	8-function calculator unit co-operating with LED display
MC7400L	MOTOROLA	获取价格	NAND Gate, 74 Series, 4-Func, 2-Input, TTL, CDIP14, TO-116, CERAMIC, DIP-14
MC7400P	MOTOROLA	获取价格	74 SERIES, QUAD 2-INPUT NAND GATE, PDIP14, TO-116, PLASTIC, DIP-14
MC7401F	MOTOROLA	获取价格	74 SERIES, QUAD 2-INPUT NAND GATE, CDFP14, CERAMIC, TO-85, 14 PIN
MC7401L	MOTOROLA	获取价格	NAND Gate, TTL, CDIP14
MC7401P	MOTOROLA	获取价格	NAND Gate, 74 Series, 4-Func, 2-Input, TTL, PDIP14, TO-116, PLASTIC, DIP-14

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