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參數(shù)資料
| 型號： | MAX6664AEE+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 297K |
| 描述： | IC TEMP MON FAN CNTRL 16-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 功能： | 風(fēng)扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | -40°C ~ 125°C，外部傳感器 |
| 精確度： | ±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） |
| 拓?fù)洌?/td> | ADC，多路復(fù)用器，寄存器庫，測速計 |
| 輸出類型： | I²C?/SMBus? |
| 輸出警報： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-QSOP |
| 包裝： | 帶卷 (TR) |
Temperature Monitors and
PWM Fan Controllers
______________________________________________________________________________________ 13
Figure 5 shows a schematic using a current-sensing
resistor and a coupling capacitor to derive the
tachometer information from the power-supply current
of a 2-wire fan. This circuit allows the speed of a 2-wire
fan to be measured even though the fan has no
tachometer signal output. The sensing resistor,
R
SENSE
, converts the fan commutation pulses into a
voltage and this voltage is AC-coupled into the
TACH/AIN input through coupling capacitor C1. The
value of R
SENSE
is on the order of 1& to 5&, depending
on the fan, and the value of the coupling capacitor C1
is 0.01礔. When using this method, set bit 2 of configu-
ration register 1 to 1.
Fan-Fault Detection
The FAN_FAULT output is used to indicate fan slow
down or failure. POR disables the FAN_FAULT output
on the MAX6653/MAX6663. POR enables FAN_FAULT
output on the MAX6664. If FAN_FAULT is not enabled,
writing a logic 1 to bit 4 of configuration register 1 (00h)
enables the FAN_FAULT output pin. Either under-
speed or stalled fans are detected as fan faults.
FAN_FAULT is asserted low only when five consecutive
interrupts are generated by the MAX6653/MAX6663/
MAX6664s INT due to fan faults. The MAX6653/
MAX6664 apply 100% duty cycle for the duration of the
spin-up time once an INT is asserted. The MAX6663
goes to 100% duty cycle for the duration of the spin-up
time once INT is asserted and status register 1 is read.
Fan-fault detection works by comparing the value of the
fan tachometer high-limit register (10h) with the value of
the fan-speed reading register (08h), which contains the
value of the most recent fan-speed measurement. Note
that the value of the fan-speed reading register (08h)
must exceed the value of the fan tachometer high limit
(10h) by 1 in order to qualify as a fault. The fault gener-
ates an interrupt signal by asserting the INT output, but
does not cause the FAN_FAULT output to assert until five
consecutive failures have been detected. The fan runs at
100% duty cycle when five consecutive failures have
been detected, whether FAN_FAULT is enabled or not.
As an example of the function of the fan-fault detection,
assume a fan is stalled or under speed. The MAX6663 ini-
tially indicates the failure by generating an interrupt on the
INT pin. The fan fault bit (bit 1) of interrupt status register
1 (02h) is also set to 1. Once the processor has acknowl-
edged the INT by reading status register 1, the INT is
cleared. PWM_OUT is then brought high for a 2s (fan
spin-up default, Table 12) spin-up period to restart the
fan. Subsequent fan failures cause INT to be reasserted
and PWM_OUT to be brought high (following a status
register 1 read) for a spin-up period each time to restart
the fan. Once the fifth tachometer failure occurs, the
FAN_FAULT is asserted to indicate a critical fan failure.
A MAX6653/MAX6664 example is somewhat simpler.
Again assume the fan is stalled or under speed. The
MAX6653/MAX6664 initially indicate the failure by gener-
ating an interrupt on the INT pin. The fan fault bit of the
interrupt status register is set to 1. PWM_OUT goes high
for the programmed spin-up time (2s default) to restart
the fan. Each subsequent fan failure causes another spin-
up. Once the fifth tachometer failure occurs, the
FAN_FAULT output is asserted (if enabled) and the PWM
output is driven to 100%.
When the FAN_FAULT output is disabled (register 00h,
bit 4), spin-ups are still attempted whenever the tach
count is greater than the value in the fan tachometer
high-limit register (10h). If fan faults and their associat-
ed spin-ups are not desired, the fan tachometer high-
limit register (10h) to FF. This prevents the tach count
from ever exceeding the limit and faults are not detect-
ed. Simply disabling the tachometer input (register 01h,
bit 2) leaves the fan fault function enabled and can
result in fan faults.
Figure 5. Using the MAX6653/MAX6663/MAX6664 with a
2-Wire Fan
100&
(TYP)
R
SENSE
MAX6653
MAX6663
MAX6664
N
3.3V
5V
C1
PWM_OUT
TACH/AIN
2&
NDT3055L
2-WIRE
FAN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6664AEE-TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6665ASA070 | 制造商:Maxim Integrated Products 功能描述: |
| MAX6665ASA40 | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 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 |
| MAX6665ASA40+ | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 Fan Controller Driver 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 |
| MAX6665ASA40+T | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 Fan Controller Driver 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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