參數(shù)資料
型號(hào)： MAX6650
廠商： Maxim Integrated Products, Inc.
英文描述： Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface
中文描述： 風(fēng)扇轉(zhuǎn)速調(diào)節(jié)器和監(jiān)控器，帶有SMBus™/I²C兼容接口
文件頁(yè)數(shù)： 19/25頁(yè)
文件大小： 315K
代理商： MAX6650
M
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
______________________________________________________________________________________
19
For parallel fan control while monitoring only a single
fan, select the MAX6650.
Synchronized Fan Control (MAX6651 Only)
In systems with multiple fans, an audible beat frequency
can sometimes be detected due to fan speed mismatch.
This happens in systems where fans are connected in
parallel or in systems with a MAX6650 controlling each
fan. In parallel fan systems, speed mismatches occur
because no two fans are identical. Slight mechanical
variations or loading differences can result in enough of
a speed mismatch to cause an audible beat.
Even in systems where there is a MAX6650/MAX6651
for each fan, there can still be speed mismatches. This
is primarily due to the oscillator tolerance. The
MAX6650/MAX6651 oscillator tolerance is specified to
be ±10%. In the worst case, this could result in a 20%
(one 10% high, one 10% low) speed mismatch.
The solution is to use a single MAX6651 for each fan,
and configure the parts to use a shared clock. The
shared clock can either be an external system clock or
one of the MAX6651
’
s internal clocks. If an external
clock is used, its frequency can range from approxi-
mately 50kHz to 500kHz.
For synchronized fan control, select the MAX6651.
Combination
In more complex systems, a combination of some or all
of the above control types may be needed.
Choosing a Fan
Once the topology is chosen, the next step is to choose
a fan. See the appropriate section.
Enter a zero in bit 3 of the configuration register for a
5V fan and 1 for a 12V fan.
Configuring this bit also adjusts the tachometer input
threshold voltage. This optimizes operation of the
MAX6650/MAX6651 for the operating voltage of the fan
being used.
Setting the Mode of Operation
The MAX6650/MAX6651 have four modes of operation
as determined by bits 5 and 6 of the configuration reg-
ister: full on, full off, open loop, and closed loop.
Full-On
The full-on mode applies the maximum available volt-
age across the fan, guaranteeing maximum cooling.
Full-on mode can be entered through software or hard-
MAX6651
V
CCIN
SCL
10k
SDA
GPIO0
OUT
ADD
GND
FB
TACH0
V
CC
3V TO 5.5V
V
5V OR 12V
C
COMP
10
SMBus/I
2
C
INTERFACE
GPIO1
GPIO2
FULL ON
ALERT
FAN
2.2k
V
ID
HOT-SWAP SECTION
Figure 13. Hot-Swap Application
相關(guān)PDF資料
PDF描述
MAX6650EUB Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface
MAX6651 HEX INVERTERS 20-LCCC -55 to 125
MAX6651EEE HEX INVERTERS 14-CDIP -55 to 125
MAX6656MEE PLASTIC ENCAPSULATED DEVICES
MAX665EWE 8V CMOS Switched-Capacitor Voltage Converter
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MAX6650EUB 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6650EUB+ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6650EUB+T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan-Speed Regulator & Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6650EUB-T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MAX6651EEE 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
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