ADP1048DC1-EVALZ Analog Devices, ADP1048DC1-EVALZ Datasheet - Page 35

• Manufacturer Part Number: ADP1048DC1-EVALZ
• Description: Daughter Cards & OEM Boards ADP1048 DAUGHTERCARD
• Manufacturer: Analog Devices
• Series: ADP1048r

Specifications of ADP1048DC1-EVALZ

• Rohs: yes
• Product: Daughter Cards
• Description/function: 100 kHz daughter board
• Dimensions: 40 mm x 25 mm
• Interface Type: I2C
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 3.3 V
• Factory Pack Quantity: 1
• For Use With: ADP1048

Data Sheet
DATA TRANSFER
Format Overview
The PMBus slave follows the transfer protocol of the SMBus
specification, which is based on the fundamental transfer
protocol format of the Philips I
January 2000. Data transfers are byte wide, lower byte first.
Each byte is transmitted serially, most significant bit (MSB)
first. A typical transfer is diagrammed in Figure 35. See the
SMBus and I
the transfer protocols.
Figure 35 through Figure 42 use the following abbreviations:
S = start condition
Sr = repeated start condition
P = stop condition
R = read bit
W = write bit
A = acknowledge bit (0)
A = acknowledge bit (1)
S
MASTER TO SLAVE
SLAVE TO MASTER
7-BIT SLAVE
ADDRESS
2
C specifications for an in-depth discussion of
Figure 35. Basic Data Transfer
W
S
A
MASTER TO SLAVE
SLAVE TO MASTER
S
ADDRESS
MASTER TO SLAVE
SLAVE TO MASTER
SLAVE
ADDRESS
2
C Bus Specification , dated
SLAVE
8-BIT DATA
S
S
MASTER TO SLAVE
SLAVE TO MASTER
MASTER TO SLAVE
SLAVE TO MASTER
ADDRESS
W
ADDRESS
SLAVE
SLAVE
W
S
A
S
MASTER TO SLAVE
SLAVE TO MASTER
A
MASTER TO SLAVE
SLAVE TO MASTER
COMMAND
ADDRESS
SLAVE ADDRESS
CODE
COMMAND
SLAVE
W
A
CODE
W
A
A
COMMAND
A
CODE
Figure 38. Write Word Protocol
Figure 41. Block Write Protocol
Figure 40. Read Word Protocol
P
Figure 37. Write Byte Protocol
Figure 36. Send Byte Protocol
W
Figure 39. Read Byte Protocol
COMMAND
A
BYTE COUNT
CODE
Sr
Rev. 0 | Page 35 of 84
A
= N
ADDRESS
W
COMMAND
A
SLAVE
CODE
Sr
A
A
ADDRESS
A
DATA BYTE
SLAVE
COMMAND CODE
R
DATA BYTE 1
“A” represents the ACK (acknowledge) bit. The ACK bit is typi-
cally active low (Logic 0) if the transmitted byte is successfully
received by a device. However, when the receiving device is the
bus master, the acknowledge bit for the last byte read is a Logic 1,
indicated by A .
Command Overview
Data transfer using the PMBus slave is established using PMBus
commands. The PMBus specification requires that all PMBus
commands start with a slave address with the R/ W bit cleared
(set to 0), followed by the command code. All PMBus commands
supported by the
types shown in
The PMBus slave module also supports manufacturer-specific
extended commands. These commands follow the same protocol
as the standard PMBus commands. However, the command
code consists of the following two bytes:
•
•
Using the manufacturer-specific extended commands, the
PMBus device manufacturer can add an additional 256
manufacturer-specific commands to its PMBus command set.
LOW
A
A
DATA BYTE
The command code extension, 0xFE
The extended command code, 0x00 to 0xFF
DATA BYTE
R
LOW
A
A
DATA BYTE
DATA BYTE
A
HIGH
A
Figure 36
A
A
ADP1047 ADP1048
P
DATA BYTE
P
DATA BYTE N
HIGH
A
A
P
through
P
/
A
A
P
ADP1047/ADP1048
Figure 42
P
follow one of the protocol
.