MAX31785ETL+ Maxim Integrated Products, MAX31785ETL+ Datasheet - Page 16

• Manufacturer Part Number: MAX31785ETL+
• Description: Board Mount Temperature Sensors 6Ch Intelligent Fan Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX31785ETL+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6-Channel Intelligent Fan Controller
Table 2. PMBus/SMBus Serial-Port
Address
16
READ WORD FORMAT
READ BYTE FORMAT
WRITE WORD FORMAT
WRITE BYTE FORMAT
SEND BYTE FORMAT
100kI to V
100kI to V
1
S
1
S
1
S
1
S
1
S
A1
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
7
7
7
7
7
DD
SS
W
W
W
W
W
1
1
1
1
1
100kI to V
100kI to V
100kI to V
100kI to V
A0
A
1
1
A
A
1
1
A
1
A
DD
DD
COMMAND
COMMAND
SS
SS
COMMAND
COMMAND
COMMAND
CODE
CODE
CODE
CODE
CODE
8
8
8
8
8
1010 101 (AAh)
1010 010 (A4h)
1010 011 (A6h)
1010 100 (A8h)
7-BIT SLAVE
ADDRESS
A
1
1
A
A
A
1
1
A
1
DATA BYTE
DATA BYTE
Sr
Sr
P
1
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. Data is sent most
significant bit (MSB) first.
DATA BYTE
R
P
1
R
1
1
HIGH
8
A
A
1
1
SMBus/PMBus Communication Examples
DATA BYTE
DATA BYTE
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
A
LOW
8
8
1
P
SMBus/PMBus Operation
NA
1
A
1
DATA BYTE
P
1
HIGH
Address Select
8
NA
1
1
P