MAX34440 MAXIM [Maxim Integrated Products], MAX34440 Datasheet - Page 16

• Manufacturer Part Number: MAX34440
• Description: PMBus 6-Channel Power-Supply Manager
• Manufacturer: MAXIM [Maxim Integrated Products]

PMBus 6-Channel Power-Supply Manager
Table 2. PMBus/SMBus Serial-Port Address
16
100kI to V
100kI to V
READ WORD FORMAT
READ BYTE FORMAT
WRITE WORD FORMAT
WRITE BYTE FORMAT
SEND BYTE FORMAT
S
S
S
S
1
S
1
1
1
1
A1
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
DD
SS
7
7
7
7
7
100kI to V
100kI to V
100kI to V
100kI to V
W
W
W
W
W
1
1
1
1
1
A0
1
A
A
1
1
A
A
A
1
1
DD
DD
SS
SS
COMMAND
COMMAND
COMMAND
COMMAND
COMMAND
CODE
CODE
CODE
CODE
CODE
8
8
8
8
8
1101 010 (D4h)
1101 011 (D6h)
1101 100 (D8h)
1101 101 (DAh)
7-BIT SLAVE
ADDRESS
A
A
1
1
1
A
A
1
1
A
DATA BYTE
DATA BYTE
Sr
Sr
1
P
1
1
LOW
8
8
ADDRESS
ADDRESS
SLAVE
SLAVE
7
7
A
1
1
A
On device power-up, the device samples the A0 and A1
pins to determine the PMBus/SMBus serial-port address.
The device implements the PMBus command structure
using the SMBus format. The structure of the data flow
between the host and the slave is shown below for sev-
eral different types of transactions. Data is sent most
significant bit (MSB) first.
DATA BYTE
R
R
1
P
1
1
HIGH
8
1
A
1
A
SMBus/PMBus Communication Examples
DATA BYTE
DATA BYTE
A
1
LOW
8
8
KEY:
S = START
Sr = REPEATED START
P = STOP
W = WRITE BIT (0)
R = READ BIT (1)
A = ACKNOWLEDGE (0)
NA = NOT ACKNOWLEDGE (1)
SHADED BLOCK = SLAVE TRANSACTION
1
P
SMBus/PMBus Operation
NA
A
1
1
DATA BYTE
1
P
HIGH
Address Select
8
NA
1
1
P