EVAL-ADM1276EBZ Analog Devices, EVAL-ADM1276EBZ Datasheet - Page 26

• Manufacturer Part Number: EVAL-ADM1276EBZ
• Description: Power Management IC Development Tools EVALUATION BOARD
• Manufacturer: Analog Devices
• Type: Hot Swap & Power Distributionr
• Series: ADM1276r

Specifications of EVAL-ADM1276EBZ

• Rohs: yes
• Tool Is For Evaluation Of: ADM1276
• Input Voltage: 20 V
• Factory Pack Quantity: 1

ADM1276
GROUP COMMANDS
The PMBus standard defines what are known as group
commands. Group commands are single bus transactions that
send commands or data to more than one device at the same
time. Each device is addressed separately, using its own address;
there is no special group command address. A group command
transaction can contain only write commands that send data to
a device. It is not possible to use a group command to read data
from devices.
Sr
Sr
S
MASTER TO SLAVE
SLAVE TO MASTER
DEVICE N ADDRESS
DEVICE 1 ADDRESS
DEVICE 2 ADDRESS
Sr
Sr
S
S
S
S
S
MASTER TO SLAVE
SLAVE TO MASTER
MASTER TO SLAVE
SLAVE TO MASTER
MASTER TO SLAVE
SLAVE TO MASTER
DATA BYTE HIGH
DATA BYTE HIGH
DEVICE N ADDRESS
DEVICE 1 ADDRESS
DEVICE 2 ADDRESS
DATA BYTE 1
DATA BYTE 1
SLAVE ADDRESS
SLAVE ADDRESS
SLAVE ADDRESS
SLAVE ADDRESS
W
W
W
A
A
A
COMMAND CODE N
COMMAND CODE 1
COMMAND CODE 2
A
A
A
A
W
W
W
W
W
W
W
P
A
A
A
A
A
A
A
DATA BYTE 2
DATA BYTE 2
COMMAND CODE N
COMMAND CODE 1
COMMAND CODE 2
PEC
COMMAND CODE
COMMAND CODE
COMMAND CODE
COMMAND CODE
Figure 57. Read Word and Read Word with PEC
Figure 58. Block Read and Block Read with PEC
A
A
A
Figure 60. Group Command with PEC
LOW DATA BYTE
LOW DATA BYTE
LOW DATA BYTE
Figure 59. Group Command
A
A
A
Rev. B | Page 26 of 48
P
A
A
A
A
A
A
A
Sr
Sr
Sr
Sr
ONE OR MORE DATA BYTES
ONE OR MORE DATA BYTES
ONE OR MORE DATA BYTES
LOW DATA BYTE
LOW DATA BYTE
LOW DATA BYTE
DATA BYTE N
DATA BYTE N
SLAVE ADDRESS
SLAVE ADDRESS
SLAVE ADDRESS
SLAVE ADDRESS
From an I
consists of the following:
•
•
•
•
A
A
A
ONE OR MORE DATA BYTES
ONE OR MORE DATA BYTES
ONE OR MORE DATA BYTES
I
Slave address bits and a write bit (followed by an
acknowledge from the slave device).
One or more data bytes (each of which is followed by an
acknowledge from the slave device).
I
2
2
C start condition.
C stop condition to end the transaction.
2
C protocol point of view, a normal write command
HIGH DATA BYTE
HIGH DATA BYTE
HIGH DATA BYTE
A
A
A
A
A
R
R
R
R
P
A
A
A
A
HIGH DATA BYTE
HIGH DATA BYTE
HIGH DATA BYTE
BYTE COUNT = N
BYTE COUNT = N
PEC
DATA BYTE LOW
DATA BYTE LOW
A
A
A
A
P
PEC N
PEC 1
PEC 2
A
A
A
A
A
A
A
P
Data Sheet
A
A
A
P