MAX34441ETL+ Maxim Integrated Products, MAX34441ETL+ Datasheet - Page 23

• Manufacturer Part Number: MAX34441ETL+
• Description: Supervisory Circuits PMBUS 5-CH POW-SUPPLY MANAGER & INTELLIGENT FAN CONTLR
• Manufacturer: Maxim Integrated Products

Specifications of MAX34441ETL+

• Internal Hysteresis: Yes
• Operating Temperature Range: - 40 C to + 85 C
• Output Type: Push-Pull
• Number Of Voltages Monitored: 5
• Watchdog: Yes
• Supply Voltage (max): 3.3 V
• Supply Current (typ): 8 A
• Maximum Power Dissipation: 2857.1 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFN-40
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 7. Fan Control Operation Modes
Note: The RPM modes should only be used with fans that provide a tachometer output.
Figure 1. Automatic Fan Control
FAN CONTROL
Automatic PWM
Automatic RPM
Manual PWM
Manual RPM
MODE
PAGE 10
PAGE 11
PAGE 7
PAGE 8
PAGE 9
PAGE 6
TEMP SENSOR 0
TEMP SENSOR 1
TEMP SENSOR 2
TEMP SENSOR 3
PMBus 5-Channel Power-Supply Manager
REMOTE DIODE
TEMP SENSOR
TEMP SENSOR
I
I
I
I
External host controls the fan speed by directly setting the fan
PWM duty cycle values.
External host controls the fan speed by setting target fan speed
values. The device reads the actual fan speed, and close loop
adjusts the output fan PWM to match the target fan speed.
The device sets the output PWM based on the fan LUT that
maps the temperature sensor readings to the required fan PWM
duty-cycle values.
The device reads the actual fan speed and close loop adjusts
the output fan PWM to match the target fan speed based on
the fan LUT that maps the temperature sensor readings to the
required fan speed.
2
2
2
2
INTERNAL
C REMOTE
C REMOTE
C REMOTE
C REMOTE
ALLOWS TEMPERATURE
ZONE NORMALIZATION
OFFSET ADJUSTMENT
FAN OPERATIONAL DETAILS
+15°C
+10°C
+5°C
+5°C
0°C
0°C
and Intelligent Fan Controller
HIGHEST TEMPERATURE
CONTROLS THE FAN
LOOKUP TABLE
FAN 8 LEVEL
FAN_CONFIG_1_2
BIT 6 OF
0
1
0
1
FAN_COMMAND_1
0000h to 7FFFh
0000h to 7FFFh
8000h to FFFFh
8000h to FFFFh
FAN
VALUE IN
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