MAX34441 MAXIM [Maxim Integrated Products], MAX34441 Datasheet - Page 20

• Manufacturer Part Number: MAX34441
• Description: PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
Table 3. PMBus Command Code Coefficients
The host system uses the following equation to convert
the value received from the PMBus device—in this case,
the MAX34441—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.
20
Voltage Scaling
Current Scaling
PARAMETER
Temperature
Fan Speed
Voltage
Current
Timing
X = (1/m) x (Y x 10 -
VOUT_MARGIN_HIGH
VOUT_MARGIN_LOW
VOUT_OV_FAULT_LIMIT
VOUT_OV_WARN_LIMIT
VOUT_UV_WARN_LIMIT
VOUT_UV_FAULT_LIMIT
POWER_GOOD_ON
POWER_GOOD_OFF
READ_VOUT
MFR_VOUT_PEAK
MFR_VOUT_MIN
VOUT_SCALE_MONITOR
IOUT_OC_WARN_LIMIT
IOUT_OC_FAULT_LIMIT
READ_IOUT
MFR_IOUT_PEAK
IOUT_CAL_GAIN
OT_FAULT_LIMIT
OT_WARN_LIMIT
READ_TEMPERATURE_1
MFR_TEMPERATURE_PEAK
READ_FAN_SPEED_1
FAN_COMMAND_1
MFR_FAN_FAULT_LIMIT
MFR_FAN_WARN_LIMIT
FAN_COMMAND_1
MFR_READ_FAN_PWM
MFR_FAN_FAULT_LIMIT
MFR_FAN_WARN_LIMIT
TON_DELAY
TON_MAX_FAULT_LIMIT
TOFF_DELAY
MFR_FAULT_RETRY
DIRECT Format Values
Interpreting Received
COMMANDS
R
- b)
UNITS
RPM
mI
mV
mA
ms
NC
—
%
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.
RESOLUTION
1/32,767
0.01
0.01
0.1
1
1
1
1
Sending a DIRECT Format Value
Y = (mX + b) x 10
32,767
32,767
3276.7
327.67
32,767
327.67
32,767
MAX
1
32,767
m
R
1
1
1
1
1
1
1
b
0
0
0
0
0
0
0
0
R
0
0
0
1
2
0
2
0