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參數(shù)資料
| 型號(hào)： | MAX6664AEE+T |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 14/24頁(yè) |
| 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(kù)，測(cè)速計(jì) |
| 輸出類型： | I²C?/SMBus? |
| 輸出警報(bào)： | 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) |
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Temperature Monitors and
PWM Fan Controllers
14 ______________________________________________________________________________________
Table 15. Power-On Default Conditions
MAX6653
MAX6663
MAX6664
Temperature Monitoring
Monitoring at 4Hz
Monitoring at 4Hz
Monitoring at 4Hz
PWM Output
Low
High
High
PWM Mode
PWM duty cycle control mode
PWM duty cycle control mode
Automatic fan speed control mode
Duty cycle setting (not
enabled until a 1 is written
to Bit 0 of Register 00h)
33%
100%
Automatic
PWM Polarity
Inverted
(100% duty cycle = output high)
Not Inverted
(100% duty cycle = output low)
Not Inverted
(100% duty cycle = output low)
Alarm Speed
For the MAX6663, the alarm speed bit, bit 0 of status
register 1 (02h), indicates that the PWM duty cycle is
100%, excluding the case of fan spin-up. For the
MAX6653/MAX6664, this bit indicates that the THERM
output is low. Once this bit is set, the only way to clear it
is by reading status register 1. However, the bit does
not reassert on the next monitoring cycle if the condi-
tion still exists. It does assert if the condition is discon-
tinued and then returns.
Power-On Default Conditions
At power-up, the MAX6653/MAX6663/MAX6664 are
monitoring temperature to protect the system against
thermal damage. The PWM outputs are in known states.
Note that although the "Monitoring" bit (Configuration
register 1, Bit 0) is enabled, automatic fan speed control
does not begin until a 1 is rewritten to Bit 0.
Other default conditions as listed in the Register Summary
section.
After applying power to the MAX6653/MAX6663/
MAX6664, set the desired operating characteristics (fan
configuration, alarm thresholds, etc.). Write to
Configuration register 1 last. When a 1 is first written to
Bit 0 of this register, fan control will commence as
determined by the register contents.
PC Board Layout
Follow these guidelines to reduce the measurement
error of the temperature sensors:
1) Place the MAX6653/MAX6663/MAX6664 as close
as is practical to the remote diode. In noisy environ-
ments, such as a computer motherboard, this dis-
tance can be 4in to 8in (typ). This length can be
increased if the worst noise sources are avoided.
Noise sources include CRTs, clock generators,
memory buses, and ISA/PCI buses.
2) Do not route the DXP-DXN lines next to the deflec-
tion coils of a CRT. Also, do not route the traces
across fast digital signals, which can easily intro-
duce 30癈 error, even with good filtering.
3) Route the DXP and DXN traces in parallel and in
close proximity to each other, away from any higher
voltage traces, such as 12VDC. Leakage currents
from PC board contamination must be dealt with
carefully since a 20M& leakage path from DXP to
ground causes about 1癈 error. If high-voltage traces
are unavoidable, connect guard traces to GND on
either side of the DXP-DXN traces (Figure 6).
4) The 10-mil widths and spacing recommended in
Figure 6 are not absolutely necessary, as they offer
only a minor improvement in leakage and noise over
narrow traces. Use wider traces when practical.
5) Add a 200& resistor in series with VCC for best
noise filtering (see Typical Operating Circuits).
MINIMUM
10 MILS
10 MILS
10 MILS
10 MILS
GND
DXN
DXP
GND
Figure 6. Recommended DXP/DXN PC Traces
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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(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 |
| MAX6665ASA40+ | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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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