MAX6885 データシートの表示（PDF） - Maxim Integrated
部品番号
コンポーネント説明
メーカー
MAX6885 Datasheet PDF : 34 Pages
| |||
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
Read Byte
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 11). The read byte procedure follows:
1) The master sends a START condition.
2) The master sends the 7-bit slave address and a
write bit (low).
3) The addressed slave asserts an ACK on the
data line.
4) The master sends 8 data bits.
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
bit (high).
8) The addressed slave asserts an ACK on the
data line.
9) The slave sends 8 data bits.
10) The master asserts a NACK on the data line.
11) The master generates a STOP condition.
SEND BYTE FORMAT
RECEIVE BYTE FORMAT
S ADDRESS WR ACK DATA ACK P
S ADDRESS WR ACK DATA ACK P
7 BITS 0
8 BITS
SLAVE ADDRESS: DATA BYTE: PRESETS THE
EQUIVALENT TO CHIP- INTERNAL ADDRESS POINTER
SELECT LINE. OF A 3-
WIRE INTERFACE
WRITE BYTE FORMAT
7 BITS 1
8 BITS
SLAVE ADDRESS:
DATA BYTE: READS DATA FROM
EQUIVALENT TO CHIP- THE REGISTER COMMANDED BY
SELECT LINE OF A 3- THE LAST READ BYTE OR WRITE
WIRE INTERFACE
BYTE TRANSMISSION. ALSO
DEPENDENT ON A SEND BYTE.
S ADDRESS WR ACK COMMAND ACK DATA ACK P
7 BITS 0
8 BITS
8 BITS
SLAVE ADDRESS: COMMAND BYTE:
EQUIVALENT TO CHIP- SELECTS REGISTER YOU
SELECT LINE OF A 3- ARE WRITING TO
WIRE INTERFACE
BLOCK WRITE FORMAT
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.
S
ADDRESS
WR
ACK
COMMAND
ACK
BYTE
COUNT = N
ACK
DATA BYTE
1
ACK
DATA BYTE
•••
ACK
DATA BYTE
N
ACK
P
7 BITS 0
8 BITS
8 BITS
8 BITS
8 BITS
8 BITS
SLAVE ADDRESS: COMMAND BYTE:
EQUIVALENT TO CHIP- PREPARES DEVICE
SELECT LINE OF A 3- FOR BLOCK OPERATION
WIRE INTERFACE
DATA BYTE:
COMMAND
BD.YATTEA
GOES
INTO
THE
REGISTER
SET
BY
THE
BLOCK READ FORMAT
S
ADDRESS
WR
ACK COMMAND ACK
SR
ADDRESS
WR
ACK
BYTE
COUNT = 16
ACK
DATA BYTE
1
ACK
DATA BYTE
•••
ACK
DATA BYTE
N
ACK
P
7 BITS 0
8 BITS
7 BITS 1
10h
8 BITS
8 BITS
8 BITS
SLAVE ADDRESS: COMMAND BYTE:
EQUIVALENT TO CHIP- PREPARES DEVICE
SELECT LINE OF A 3- FOR BLOCK
WIRE INTERFACE
OPERATION
S = START CONDITON
P = STOP CONDITION
SHADED = SLAVE TRANSMISSION
SR = REPEATED START CONDTION
SLAVE ADDRESS:
DATA BYTE: DATA GOES INTO THE REGISTER SET BY THE
EQUIVALENT TO CHIP- COMMAND BYTE
SELECT LINE OF A 3-
WIRE INTERFACE
Figure 11. SMBus/I2C Protocols
______________________________________________________________________________________ 29
Share Link: 