NE1617ADS,112【PDF 12/30 页】IC TEMP MONITOR 16SSOP

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NE1617A

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Product data sheet

Rev. 5 20 March 2012

12 of 30

NXP Semiconductors

NE1617A

Temperature monitor for microprocessor systems

8.6 SMBus interface

The device can communicate over a standard 2-wire serial interface System Management

Bus (SMBus) using the device pins SCLK and SDATA. The device employs four standard

SMBus protocols: write byte, read byte, send byte and receive byte. Data formats of those

protocols are shown in Figure 3

with following notifications:

" The SMBus master initiates data transfer by establishing a START condition (S) and

terminates data transfer by generating a STOP condition (P).

" Data is sent over the serial bus in sequence of 9 clock pulses according to each 8-bit

data byte followed by 1-bit status of the device acknowledgement.

" The 7-bit slave address is equivalent to the selected address of the device.

" The command byte is equivalent to the selected command of the device register.

" The send byte format is often used for the one-shot conversion command.

" The receive byte format is used for quicker transfer data from a device reading

a. Write byte format (for writing data byte to the device register)

b. Read byte format (for reading data byte from the device register)

c. Send byte format (for sending command without data, such as one-shot command)

d. Receive byte format (for continuously reading from device register)

Fig 3. SMBus programming format

START condition

R/W

acknowledged

by device

7 bits device address

STOP

condition

8 bits to register

command

ACK

8 bits device register

acknowledged

by device

ACK

data

acknowledged

by device

ACK

address

START condition

R/W

acknowledged

by device

7 bits device address

STOP

condition

8 bits from register

command

ACK

8 bits device register

acknowledged

by device

ACK

data

not

acknowledged

by controller

NACK

address

(re)START

condition

7 bits device address

address

R/W

acknowledged

by device

ACK

START condition

R/W

acknowledged

by device

7 bits device address

STOP

condition

command

ACK

8 bits device register

acknowledged

by device

ACK

address

START condition

R/W

acknowledged

by device

7 bits device address

STOP

condition

data

ACK

8 bits from register

not

acknowledged

b controller

NACK

address

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