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NE1617ADS,118(2009) View Datasheet(PDF) - NXP Semiconductors.

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NE1617ADS,118
(Rev.:2009)
NXP
NXP Semiconductors. NXP
NE1617ADS,118 Datasheet PDF : 27 Pages
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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
register that was previously selected by a read byte format.
address
ACK
command
ACK
S 7 bits device address 0
8 bits device register
data
8 bits to register
ACK
P
START condition
R/W acknowledged
by device
acknowledged
by device
acknowledged STOP
by device condition
002aad523
a. Write byte format (for writing data byte to the device register)
address
ACK
command
ACK
address
ACK
S 7 bits device address 0
8 bits device register
S 7 bits device address 1
data
NACK
8 bits from register
P
START condition
R/W acknowledged
by device
acknowledged (re)START
by device condition
R/W acknowledged
by device
not STOP
acknowledged condition
by controller
002aad524
b. Read byte format (for reading data byte from the device register)
address
ACK
command
ACK
S 7 bits device address 0
8 bits device register
P
START condition
R/W acknowledged
by device
acknowledged STOP
by device condition
002aad525
c. Send byte format (for sending command without data, such as one-shot command)
address
ACK
S 7 bits device address 1
data
NACK
8 bits from register
P
START condition
R/W acknowledged
by device
not STOP
acknowledged condition
by controller 002aad526
d. Receive byte format (for continuously reading from device register)
Fig 3. SMBus programming format
NE1617A_4
Product data sheet
Rev. 04 — 30 July 2009
© NXP B.V. 2009. All rights reserved.
12 of 27
 

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