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MAX34446
PMBus Power-Supply Data Logger
Interpreting Received
DIRECT Format Values
The host system uses the following equation to convert
the value received from the PMBus device—in this case,
the MAX34446—into a reading of volts, degrees Celsius,
or other units as appropriate:
X = (1/m) x (Y x 10 -R - b)
where X is the calculated, real world value in the appro-
priate units (V, N C, etc.); m is the slope coefficient; Y is
the 2-byte, two’s complement integer received from the
PMBus device; b is the offset; and R is the exponent.
Sending a DIRECT Format Value
To send a value, the host must use the below equation
to solve for Y:
Y = (mX + b) x 10 R
where Y is the 2-byte, two’s complement integer to be
sent to the unit; m is the slope coefficient; X is the real
world value, in units such as volts, to be converted for
transmission; b is the offset; and R is the exponent.
The following example demonstrates how the host can
send and retrieve values from the device.
If the host received a value of 0D89h on a READ_VOUT
command, this is equivalent to:
X = (1/1) x (0D89h x 10 -(-0) – 0) = 3465mV = 3.465V
with READ_VOUT (8Bh) coefficients m = 1, b = 0, and
R = 0 (see Table 3 ).
All voltage-related parameters of PMBus devices are
reported as positive values. It is up to the system to know
that a particular output is negative if that is of interest to
the system. All output voltage-related commands use
2 data bytes.
Maxim Integrated
Fault Management and Reporting
Faults are reported in the various status registers and,
if enabled with the MFR_FAULT_RESPONSE command,
faults can also be indicated on the associated FAULTn
output. See the individual command sections for more
details.
Faults and warnings that are latched in the status regis-
ters are cleared when any one of the following conditions
occurs:
? A CLEAR_FAULTS command is received.
? The RST pin is toggled low.
? Bias power to the device is removed and then reapplied.
The device responds to fault conditions accord-
ing to the manufacturer fault response command
(MFR_FAULT_RESPONSE). This command byte deter-
mines how the device should respond to each particular
fault.
Password Protection
The device can be password protected by using the
LOCK bit in the MFR_MODE command. Once the
device is locked, only certain PMBus commands can be
accessed with the serial port. See Table 1 for a complete
list. Commands that have password protection return all
ones (FFh) with the proper number of data bytes when
read. When the device is locked, only the PAGE and
MFR_SERIAL commands can be written; all other com-
mands that are written are ignored. When MFR_SERIAL
is written and the upper 4 bytes match the internally flash-
stored value, the device unlocks and remains unlocked
until the LOCK bit in MFR_MODE is activated once again.
The LOCKED status bit in STATUS_MFR_SPECIFIC is
always available to indicate whether the device is locked
or unlocked.
14
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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