MAX34441EVKIT# Maxim Integrated, MAX34441EVKIT# Datasheet - Page 46

• Manufacturer Part Number: MAX34441EVKIT#
• Description: Power Management IC Development Tools MAX34441 Eval Kit
• Manufacturer: Maxim Integrated
• Type: PWM Controllersr
• Series: MAX34441r

Specifications of MAX34441EVKIT#

• Rohs: yes
• Product: Power Management Development Tools
• Tool Is For Evaluation Of: MAX34441
• Interface Type: I2C
• Maximum Operating Temperature: + 85 C
• Part # Aliases: 90-34441#K00

The MFR_FAN_CONFIG command is used with FAN_CONFIG_1_2 to configure the fan. See the FAN_CONFIG_1_2
description for more details on this command. Table 32 described the MFR_FAN_CONFIG command.
Table_32._MFR_FAN_CONFIG
PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
46
15:13
11:10
BIT
12
9
8
BIT_NAME
FREQ[2:0]
HYS[1:0]
TACHO
TSFO
0
The FREQ bits set the PWM frequency. Note: The device does not support pulse stretching.
This bit always returns a 0.
The HYS bits determine the amount of hysteresis the device uses to determine how far the tem-
perature must fall below the temperature level threshold programmed in the LUT before switch-
ing to the lower PWM/RPM value. The hysteresis should be set lower than the minimum differ-
ence between two adjacent temperature steps. These bits are ignored if automatic fan control is
disabled.
0 = Ramp to 100% PWM duty cycle if temp sensor faults (automatic fan mode) or if no
FAN_COMMAND_1 update occurs (manual fan mode) in any 10s period.
1 = Temp sensor fault or update rate to FAN_COMMAND_1 is ignored. Operate at the last
updated PWM/RPM value.
Note_1: A temp sensor fault is a faulty temperature sensor reading, not an overtemperature fault.
Note_2: In automatic fan mode, if the TSFO bit is set to 1, the device ignores a sensor fault and
uses the remaining assigned temperature sensors (if any) to control the fan PWM duty cycle; or,
if the fan has no available temperature sensors to use, it maintains the last updated PWM/RPM
fan value before the fault occurred.
0 = Ramp fan to 100% PWM duty cycle if fan fault is detected.
1 = Do not ramp fan to 100% PWM duty cycle if fan fault is detected.
Note: If the fan fault is removed after ramping the PWM to 100% duty cycle, normal fan opera-
tion is resumed.
FREQ2
HSY1
0
0
0
0
1
1
1
1
0
0
1
1
FREQ1
0
0
1
1
0
0
1
1
HSY0
0
1
0
1
MEANING
FREQ0
0
1
0
1
0
1
0
1
THERMAL_HYSTERESIS_(NC)
MFR_FAN_CONFIG (F1h)
PWM_FREQUENCY
2
4
6
8
Reserved
Reserved
Reserved
100Hz
150Hz
25kHz
30Hz
50Hz