MAX34441 MAXIM [Maxim Integrated Products], MAX34441 Datasheet - Page 16

• Manufacturer Part Number: MAX34441
• Description: PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
Table 1. PMBus Command Codes (continued)
Note 3: The factory-set default value for this 8-byte block is 3130313031303130h.
Note 4: The factory-set default value for the complete block of the MFR_NV_FAULT_LOG is FFh.
Note 5: The power-on reset value for this 4-byte block is 00000000h.
Note 6: The factory-set default value for the complete block of the MFR_FAN_LUT is 00h.
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
loaded upon power-on reset or when the RST pin is asserted and the value shown in the Default Value column is the
value when shipped from the factory. “FIXED” in the Flash Stored column means this value is fixed at the factory and
cannot be changed.
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
DD
SS
7
7
7
7
7
100kI to V
100kI to V
W
W
W
W
W
100kI to V
100kI to V
1
1
1
1
1
A0
A
A
1
1
A
A
A
1
1
1
DD
DD
SS
SS
COMMAND
COMMAND
COMMAND
COMMAND
COMMAND
CODE
CODE
CODE
CODE
CODE
8
8
8
8
8
1101 101 (DAh)
1101 010 (D4h)
1101 011 (D6h)
1101 100 (D8h)
7-BIT SLAVE
ADDRESS
A
A
A
1
1
1
1
A
A
1
DATA BYTE
DATA BYTE
Sr
Sr
1
P
1
1
LOW
8
8
ADDRESS
ADDRESS
SLAVE
SLAVE
7
7
A
A
1
1
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. All transactions begin
with a host sending a command code that is immediately
preceded with a 7-bit slave address (R/W = 0). Data is
sent most significant bit (MSB) first.
DATA BYTE
R
R
1
P
1
1
HIGH
8
A
A
1
1
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
1
A
1
DATA BYTE
1
P
HIGH
Address Select
8
NA
1
1
P