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MAX34446
PMBus Power-Supply Data Logger
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 com-
mand. When the device receives a command through
this protocol, it immediately begins execution of the
received command after detecting the STOP condition.
The device supports the PAGE command and uses it to
select which individual channel to access. When a 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 sig-
nificant bit (LSB) is sent last.
PMBus Protocol Support
The device supports a subset of the commands defined
in the PMBus Power System Management Protocol
Specification Part II - Command Language, Revision
1.1 . For detailed specifications and the complete list of
Table 3. PMBus Command Code Coefficients
PMBus commands, refer to Part II of the PMBus speci-
fication available at www.PMBus.org. The supported
PMBus commands and the corresponding device behav-
ior are described in this document. All data values are
represented in DIRECT format, unless otherwise stated.
Whenever the PMBus specification refers to the PMBus
device, it is referring to the MAX34446. While the com-
mand can call for turning on or turning off the PMBus
device, the MAX34446 always remains on to continue
communicating with the PMBus master.
Data Format
Voltage data for commanding or reading the output
voltage or related parameters (such as the overvoltage
threshold) is presented in DIRECT format. DIRECT format
data is a 2-byte, two’s complement binary value. DIRECT
format data can be used with any command that sends
or reads a parametric value. The DIRECT format uses
an equation and defined coefficients to calculate the
desired values. Table 3 shows the coefficients used by
the device.
PARAMETER
COMMANDS
UNITS
RESOLUTION
MAX
m
b
R
VOUT_OV_FAULT_LIMIT
VOUT_UV_FAULT_LIMIT
POWER_GOOD_ON
Voltage
POWER_GOOD_OFF
mV
1
32,767
1
0
0
READ_VOUT
MFR_VOUT_PEAK
MFR_VOUT_MIN
Voltage Scaling
VOUT_SCALE_MONITOR
—
1/32,767
1
32,767
0
0
IOUT_OC_FAULT_LIMIT
Current
READ_IOUT
MFR_IOUT_PEAK
mA
1
32,767
1
0
0
MFR_IOUT_AVG
Current Scaling
IOUT_CAL_GAIN
m I
0.1
3276.7
1
0
1
OT_FAULT_LIMIT
Temperature
READ_TEMPERATURE_1
MFR_TEMPERATURE_PEAK
N C
0.01
327.67
1
0
2
MFR_TEMPERATURE_AVG
Timing
MFR_FAULT_RETRY
MFR_PG_DELAY
ms
1
32,767
1
0
0
READ_POUT
Power
MFR_POUT_PEAK
W
1
32,767
1
0
0
MFR_POUT_AVG
Maxim Integrated
13
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相关代理商/技术参数
MAX3444EAPA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA+ 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA+T 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA-T 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EEPA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EESA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EESA+ 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube