MAX34446EVKIT# Maxim Integrated, MAX34446EVKIT# Datasheet - Page 14

• Manufacturer Part Number: MAX34446EVKIT#
• Description: Supervisory Circuits MAX34446 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX34446r

Specifications of MAX34446EVKIT#

• Rohs: yes
• Number Of Voltages Monitored: 4
• Output Type: Active High, Active Low, Open Drain, Push-Pull
• Watchdog: Watchdog
• Supply Voltage - Max: 5.5 V
• Supply Current (typ): 3 mA
• Supply Voltage - Min: 2.7 V
• Part # Aliases: 90-34446#K00

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:
where X is the calculated, real world value in the appro-
priate units (V, NC, 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.
To send a value, the host must use the below equation
to solve for Y:
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:
with READ_VOUT (8Bh) coefficients m = 1, b = 0, and
R = 0 (see
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
X = (1/1) x (0D89h x 10
Table
Sending a DIRECT Format Value
X = (1/m) x (Y x 10
3).
Y = (mX + b) x 10
-(-0)
DIRECT Format Values
Interpreting Received
– 0) = 3465mV = 3.465V
-R
R
- b)
PMBus Power-Supply Data Logger
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.
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
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.
Fault Management and Reporting
Password Protection
MAX34446
Table 1
for a complete
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