参数资料
型号: MAX8688BLETG+T
厂商: Maxim Integrated Products
文件页数: 21/38页
文件大小: 0K
描述: IC PWR SUPPLY CTRLR/MONTR 24TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
应用: 电源控制器/监控器
电源电压: 3 V ~ 3.6 V
电流 - 电源: 6.7mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-WFQFN 裸露焊盘
供应商设备封装: 24-TQFN-EP(4x4)
包装: 带卷 (TR)
Digital Power-Supply Controller/Monitor
with PMBus Interface
PMBus Digital Interface
From a software perspective, the MAX8688 appears as a
PMBus device capable of executing a subset of PMBus
commands. A PMBus 1.0-compliant device uses the
SMBus version 1.1 for transport protocol and responds
to the SMBus slave address. In this data sheet, the term
SMBus is used to refer to the electrical characteristics of
the PMBus communication using the SMBus physical
layer. The term PMBus is used to refer to the PMBus
command protocol.
The MAX8688 employs five standard SMBus protocols
(Write Word, Read Word, Write Byte, Read Byte and Send
Byte (see Figures 12–15)) to program output voltage and
warning/faults thresholds, read monitored data, and pro-
vide access to all manufacturer-specific commands.
The MAX8688 also supports the group command. The
group command is used to send commands to more
than one PMBus device. It is not required that all the
devices receive the same command. However, no more
than one command can be sent to any one device in
one group command packet. The group command
must not be used with commands that require receiving
devices to respond with data, such as the
STATUS_BYTE command. When the MAX8688 receives
a command through this protocol, it immediately begins
execution of the received command after detecting the
STOP condition.
When the data word is transmitted, the lower order byte
is sent first and the higher order byte is sent last. Within
any byte, the most significant bit (MSB) is sent first and
the least significant bit (LSB) is sent last.
WRITE BYTE FORMAT
S
ADDR
W
A
COMMAND
A
DATA
A
P
7 BITS
SLAVE ADDRESS
8 BITS
COMMAND BYTE:
SELECTS WHICH
8 BITS
DATA BYTE: DATA FOR THE COMMAND
SET BY THE COMMAND BYTE
COMMAND PARAMETER
TO WRITE TO
READ BYTE FORMAT
S
ADDR
W
A
COMMAND
A
SR
ADDR
R
A
DATA
NA
P
7 BITS
SLAVE ADDRESS
8 BITS
COMMAND BYTE:
SELECTS WHICH
COMMAND PARAMETER
TO READ FROM
7 BITS
SLAVE ADDRESS:
REPEATED DUE TO
CHANGE IN DATA-FLOW
DIRECTION
8 BITS
DATA BYTE: DATA FOR THE COMMAND
SET BY THE COMMAND BYTE
WRITE WORD FORMAT
S
ADDR
W
A
COMMAND
A
DATA0
A
DATA1
A
P
7 BITS
8 BITS
8 BITS
8 BITS
SLAVE ADDRESS
COMMAND BYTE:
SELECTS WHICH
DATA BYTE: DATA FOR THE COMMAND SET BY THE
COMMAND BYTE
COMMAND PARAMETER
TO WRITE TO
READ WORD FORMAT
S
ADDR
W
A
COMMAND
A
SR
ADDR
R
A
DATA0
A
DATA1
NA
P
7 BITS
8 BITS
7 BITS
8 BITS
8 BITS
SLAVE ADDRESS
COMMAND BYTE:
SELECTS WHICH
COMMAND PARAMETER
TO READ FROM
SLAVE ADDRESS:
REPEATED DUE TO
CHANGE IN DATA-FLOW
DIRECTION
DATA BYTE: DATA FOR THE COMMAND SET BY THE
COMMAND BYTE
SEND BYTE FORMAT
S
ADDR
W
A
COMMAND
A
P
S = START CONDITION.
7 BITS
SLAVE ADDRESS
Figure 12. SMBus Protocols
8 BITS
COMMAND BYTE: SEND
COMMAND WITH NO DATA
SR = REPEATED START CONDITION.
P = STOP CONDITION.
= SLAVE TRANSMISSION.
______________________________________________________________________________________
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