MAX16049 Maxim Integrated Products, MAX16049 Datasheet - Page 48

• Manufacturer Part Number: MAX16049
• Description: (MAX16047 / MAX16049) 12-Channel/8-Channel EEPROM-Programmable System Managers
• Manufacturer: Maxim Integrated Products

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8) The slave asserts an ACK on SDA.
9) The slave sends the 8-bit byte count (16).
10) The master asserts an ACK on SDA.
11) The slave sends 8 bits of data.
12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
Figure 12: I
48
S = START CONDITION
P = STOP CONDITION
SR = REPEATED START CONDITION
D.C. = DON'T CARE
______________________________________________________________________________________
WRITE BYTE FORMAT
READ BYTE FORMAT
SEND BYTE FORMAT
BLOCK READ FORMAT
BLOCK WRITE FORMAT
S
S
S
S
S
2
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
C/SMBus Protocols
ADDRESS
ADDRESS
ADDRESS
ADDRESS
7 BITS
SLAVE
7 BITS
7 BITS
ADDRESS
7 BITS
7 BITS
WR
WR
WR
0
WR
0
0
0
WR
0
ACK COMMAND ACK
ACK COMMAND ACK
ACK
ACK COMMAND ACK
DATA BYTE: PRESETS THE
INTERNAL ADDRESS POINTER
OR REPRESENTS A COMMAND.
COMMAND BYTE:
PREPARES DEVICE
FOR FOLLOWING
READ.
COMMAND BYTE:
PREPARES DEVICE
FOR BLOCK
OPERATION.
ACK = ACKNOWLEDGE, SDA PULLED LOW DURING RISING EDGE OF SCL
NACK = NOT ACKNOWLEGE, SDA LEFT HIGH DURING RISING EDGE OF SCL
ALL DATA IS CLOCKED IN/OUT OF THE DEVICE ON RISING EDGES OF SCL
ACK
COMMAND BYTE:
DESTINATION
ADDRESS
8 BITS
8 BITS
8 BITS
DATA
8 BITS
COMMAND BYTE:
SELECTS REGISTER OR
EEPROM LOCATION
YOU ARE WRITING TO.
COMMAND
8 BITS
ACK
SR
COUNT= N
SR
P
8 BITS
BYTE
ACK
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
ADDRESS
ADDRESS
SLAVE
7 BITS
7 BITS
DATA BYTE: DATA GOES INTO THE
REGISTER (OR EEPROM LOCATION)
SET BY THE COMMAND BYTE.
ACK
DATA
8 BITS
DATA BYTE: DATA GOES INTO THE REGISTER SET BY THE
COMMAND
WR
WR
DATA BYTE
1
1
8 BITS
1
ACK
ACK DATA BYTE NACK
RECEIVE BYTE FORMAT
ACK
S
DATA BYTE: DATA IS READ FROM THE REGISTER (OR
EEPROM LOCATION) SET BY THE COMMAND CODE
DATA BYTE: DATA COMES
FROM THE REGISTER SET BY
THE COMMAND BYTE.
COUNT= N
ACK
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
12) The master asserts an ACK on SDA.
13) Repeat steps 11 and 12 up to fifteen times.
14) The master asserts a NACK on SDA.
15) The master sends a STOP condition.
8 BITS
8 BITS
ADDRESS
BYTE
7 BITS
P
DATA BYTE
8 BITS
...
ACK
WR
1
DATA BYTE
ACK
P
ACK
= SDA TRANSISTIONS FROM HIGH TO LOW DURING PERIOD OF SCL
= SDA TRANSISTIONS FROM LOW TO HIGH DURING PERIOD OF SCL
8 BITS
1
DATA BYTE
DATA BYTE: PRESETS THE
INTERNAL ADDRESS POINTER
OR REPRESENTS A COMMAND.
8 BITS
8 BITS
DATA
N
ACK
DATA BYTE
ACK
NACK
8 BITS
...
P
P
MASTER TO SLAVE
SLAVE TO MASTER
ACK
DATA BYTE
8 BITS
N
NACK
P