MAX34441ETL+ Maxim Integrated Products, MAX34441ETL+ Datasheet - Page 31

• 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 16. PWM Fan Mode (FAN_CONFIG_1_2 Bit 6 = 0)
Table 17. RPM Fan Mode (FAN_CONFIG_1_2 Bit 6 = 1)
The FAN_CONFIG_1_2 command is used in conjunction with MFR_FAN_CONFIG to configure the fan. See the
MFR_FAN_CONFIG (F1h) section for more details on this command. The FAN_CONFIG_1_2 command is described
in Table 15.
Table 15. FAN_CONFIG_1_2 Command Byte
The FAN_COMMAND_1 command is used to override the device’s automatic fan-control function and force the fan
to either a fixed PWM duty-cycle value or a target fan speed (in RPM). The units of the FAN_COMMAND_1 are either
percent duty cycle (if bit 6 of FAN_CONFIG_1_2 is zero) or RPM (if bit 6 of FAN_CONFIG_1_2 is one). Any value less
than 0% duty cycle or 0 RPM causes the device to ignore this command and use the automatic fan-control function.
Any value greater than or equal to 0% duty cycle or 0 RPM causes the device to ignore the automatic fan-control func-
tion and force the fan to the PWM value or RPM value provided by the FAN_COMMAND_1 command. The 2 data bytes
are in DIRECT format.
BIT
5:4
3:0
7
6
FAN_COMMAND_1 VALUE
FAN_COMMAND_1 VALUE
0000h to 2710Fh
PMBus 5-Channel Power-Supply Manager
8000h to FFFFh
2711h to 7FFFh
8000h to FFFFh
0000h to 7FFFh
FAN ENABLE
RPM/PWM
PULSE
NAME
0
0 = Fan disabled (PWM5 forced low).
1 = Fan enabled.
0 = PWM duty cycle is the fan-controlling
parameter.
1 = RPM is the fan-controlling parameter.
00 = 1 Tach pulse per fan revolution.
01 = 2 Tach pulses per fan revolution.
10 = 3 Tach pulses per fan revolution.
11 = 4 Tach pulses per fan revolution.
These bits always return a 0.
and Intelligent Fan Controller
Ignore FAN_COMMAND_1 and use automatic fan-control function
0 to 100% fan PWM duty cycle
100% fan PWM duty cycle
Ignore FAN_COMMAND_1 and use automatic fan-control function
0 to 32,767 RPM
MEANING
DEVICE RESPONSE
DEVICE RESPONSE
FAN_COMMAND_1 (3Bh)
FAN_CONFIG_1_2 (3Ah)
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