MAX6633 データシートの表示（PDF） - Maxim Integrated

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MAX6633

12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface

Maxim Integrated 

MAX6633/MAX6634/

MAX6635

12-Bit Plus Sign Temperature Sensors

with SMBus/I2C-Compatible Serial Interface

Write Byte Format

S

ADDRESS

WR

7 bits

Slave Address:

equivalent to chip-select

line of a 3-wire interface

ACK

COMMAND

8 bits

ACK

Command Byte: selects

register you are writing to

DATA

ACK

P

8 bits

Data Byte: data goes into the register set by

the command byte

Write Word Format

S

ADDRESS

WR

ACK COMMAND ACK DATA ACK DATA

ACK

P

7 bits

8 bits

8 bits

(MSB)

8 bits

(LSB)

Slave Address:

equivalent to chip-select

line of a 3-wire interface

Command Byte:

selects register you

are writing to

Data Bytes: data goes into the

register set by the command

byte

Read Byte Format

S ADDRESS WR ACK COMMAND ACK S ADDRESS RD

ACK

7 bits

8 bits

7 bits

Slave Address: equivalent

to chip-select line

Command Byte:

selects register you

are reading from

Slave Address: repeated due to

change in data-flow direction

DATA

///

P

8 bits

Data Byte: reads from the

register set by the command

byte

Read Word Format

S ADDRESS WR ACK COMMAND ACK S ADDRESS RD ACK DATA ACK DATA /// P

7 bits

8 bits

7 bits

8 bits

(MSB)

8 bits

(LSB)

Slave Address:

equivalent to chip-

select line

Command Byte:

selects register you

are reading from

Slave Address: repeated

due to change in data-flow

direction

Data Bytes: reads from the

register set by the command

byte

S = Start condition

P = Stop condition

Shaded = Slave transmission

/// = Not acknowledged

Figure 1. SMBus Protocols

A

B

C

D

EF

G

tLOW tHIGH

SMBCLK

SMBDATA

tSU:STA tHD:STA

tSU:DAT

tHD:DAT

A = START CONDITION

B = MSB OF ADDRESS CLOCKED INTO SLAVE

C = LSB OF ADDRESS CLOCKED INTO SLAVE

D = R/W BIT CLOCKED INTO SLAVE

E = SLAVE PULLS SMBDATA LINE LOW

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER

G = MSB OF DATA CLOCKED INTO SLAVE

H = LSB OF DATA CLOCKED INTO SLAVE

I = SLAVE PULLS SMBDATA LINE LOW

Figure 2. SMBus Write Timing Diagram

H

I JK

LM

tSU:STO tBUF

J = ACKNOWLEDGE CLOCKED INTO MASTER

K = ACKNOWLEDGE CLOCK PULSE

L = STOP CONDITION, DATA EXECUTED BY SLAVE

M = NEW START CONDITION

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