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Automatic PWM Fan-Speed Controllers with
Overtemperature Output
4  _______________________________________________________________________________________
Pin Description
PIN
MAX6643
MAX6644
MAX6645
NAME
FUNCTION
1, 15
1, 15

TH1, TH2
High-Temperature Threshold Inputs. Connect to V
DD
, GND, or
leave unconnected to select the upper fan-control trip
temperature (T
HIGH
), in 5癈 increments. See Table 1.
2, 3
2, 3

TL2, TL1
Low-Temperature Threshold Inputs. Connect to V
DD
, GND, or
leave unconnected to select the lower fan-control trip
temperature (T
LOW
), in 5癈 increments. See Table 2.
4
4
1
FANFAIL
Fan-Fail Alarm Output. FANFAIL is an active-low, open-drain
output. If the FAN_IN_ detects a fan failure, the FANFAIL output
asserts low.
5
5
2
TACHSET
FAN_IN_ Control Input. TACHSET controls what type of fan-fail
condition is being detected. Connect TACHSET to V
DD
, GND,
or leave floating to set locked rotor, current sense, or
tachometer configurations (see Table 3).
6


FULLSPD
Active-High Logic Input. When pulled high, the fan runs at
100% duty cycle.



FULLSPD
Active-Low Logic Input. When pulled low, the fan runs at 100%
duty cycle.
7
7
4
GND
Ground
8


DXP

6, 8
3, 5
DXP2, DXP1
C om b i ned C ur r ent S our ce and A/D P osi ti ve Inp ut for
 Rem ote
D i
od e. C onnect to anod e of r em
ote d i od e- connected
tem p
er
atur e- sensi ng tr ansi
stor . C onnect to G N D i f no r em ote
d i
od e i s used . P l ace a 2200p F cap
aci tor b etw een D X P _ and
G N D for noi
se fi l ter i
ng .
9
9
6
OT
Active-Low, Open-Drain Overtemperature Output. When OT
threshold is exceeded, OT pulls low.
10, 11
10, 11
7, 8
FAN_IN2,
FAN_IN1
Fan- S ense Inp ut. FAN _IN
_ can b
e confi
g
ur ed to m oni
tor
 ei
ther a
fan s l
og i
c-
l evel l
ocked - r
otor outp ut, tachom eter outp ut, or
 sense-
r
esi stor w avefor m to d etect fan fai l ur e. The M AX 6643 s FAN _IN _
i
np ut can m oni tor
 onl y tachom eter si
g
nal s. The M
AX
6644 and the
M
AX 6645 can m oni
tor
 any one of the thr
ee si g
nal typ es as
confi
g
ur
ed usi
ng the TAC H S E T i np ut.
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相关代理商/技术参数
MAX6643LBFAEE+T 功能描述:马达/运动/点火控制器和驱动器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MAX6643LBFAEE-T 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6644LBAAEE 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6644LBAAEE+ 功能描述:马达/运动/点火控制器和驱动器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MAX6644LBAAEE+T 功能描述:马达/运动/点火控制器和驱动器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MAX6644LBAAEE-T 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
MAX6645AAFAUB 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MAX6645AAFAUB-T 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube