MAX6884ETP MAXIM [Maxim Integrated Products], MAX6884ETP Datasheet - Page 29

• Manufacturer Part Number: MAX6884ETP
• Description: EEPROM-Programmable, Hex Power-Supply Supervisory Circuits
• Manufacturer: MAXIM [Maxim Integrated Products]

The read byte protocol allows the master device to
read the register or an EEPROM location (user or con-
figuration) content of the MAX6884/MAX6885 (see
Figure
1) The master sends a START condition.
2) The master sends the 7-bit slave address and a
3) The addressed slave asserts an ACK on the
4) The master sends 8 data bits.
Figure
write bit (low).
data line.
11. SMBus/I
11). The read byte procedure follows:
S = START CONDITON
P = STOP CONDITION
SHADED = SLAVE TRANSMISSION
SR = REPEATED START CONDTION
SEND BYTE FORMAT
WRITE BYTE FORMAT
BLOCK WRITE FORMAT
BLOCK READ FORMAT
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
C Protocols
______________________________________________________________________________________
ADDRESS
ADDRESS WR ACK
ADDRESS WR ACK COMMAND ACK
ADDRESS WR ACK COMMAND ACK SR ADDRESS WR ACK
7 BITS
7 BITS
7 BITS
7 BITS
.
WR
0
0
0
0
ACK
DATA BYTE: PRESETS THE
INTERNAL ADDRESS POINTER
COMMAND BYTE:
SELECTS REGISTER YOU
ARE WRITING TO
Power-Supply Supervisory Circuits
COMMAND BYTE:
PREPARES DEVICE
FOR BLOCK OPERATION
COMMAND BYTE:
PREPARES DEVICE
FOR BLOCK
OPERATION
8 BITS
8 BITS
8 BITS
DATA
COMMAND
8 BITS
ACK
COUNT = N
P
8 BITS
Read Byte
BYTE
EEPROM-Programmable, Hex
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A 3-
WIRE INTERFACE
ACK
7 BITS
ACK DATA BYTE
DATA BYTE: DATA GOES INTO THE
REGISTER SET BY THE COMMAND
BYTE IF THE COMMAND IS BELOW
50h. IF THE COMMAND is 80h,
81h, or 82h, THE DATA BYTE PRESETS
THE LSB OF AN EEPROM ADDRESS.
8 BITS
DATA
DATA BYTE: DATA GOES INTO THE REGISTER SET BY THE
COMMAND BYTE
1
8 BITS
1
RECEIVE BYTE FORMAT
S
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A 3-
WIRE INTERFACE
ADDRESS
ACK
5) The active slave asserts an ACK on the data line.
6) The master sends a repeated start condition.
7) The master sends the 7-bit slave ID plus a read
8) The addressed slave asserts an ACK on the
9) The slave sends 8 data bits.
10) The master asserts a NACK on the data line.
11) The master generates a STOP condition.
COUNT = 16
ACK DATA BYTE
7 BITS
DATA BYTE: DATA GOES INTO THE REGISTER SET BY THE
COMMAND BYTE
.
BYTE
10h
bit (high).
data line.
P
8 BITS
•••
WR
ACK
1
ACK
ACK DATA BYTE
DATA BYTE
8 BITS
DATA BYTE: READS DATA FROM
THE REGISTER COMMANDED BY
THE LAST READ BYTE OR WRITE
BYTE TRANSMISSION. ALSO
DEPENDENT ON A SEND BYTE.
1
8 BITS
DATA
8 BITS
N
ACK
ACK
ACK
DATA BYTE
8 BITS
•••
P
P
ACK
DATA BYTE
8 BITS
N
ACK
P
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