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參數(shù)資料
| 型號： | MAX6663 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Temperature Monitors and PWM Fan Controllers |
| 中文描述： | 溫度監(jiān)視器和PWM風(fēng)扇控制器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 297K |
| 代理商： | MAX6663 |
M
Temperature Monitors and
PWM Fan Controllers
14
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Table 15. Power-On Default Conditions
MAX6653
MAX6663
MAX6664
Temperature Monitoring
PWM Output
PWM Mode
Monitoring at 4Hz
Low
PWM duty cycle control mode
Monitoring at 4Hz
High
PWM duty cycle control mode
Monitoring at 4Hz
High
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
°
C 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
°
C 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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| MAX6663AEE | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6663AEE+ | 功能描述:板上安裝溫度傳感器 Temperature Monitor & PWM Fan Controller RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6663AEE+T | 功能描述:板上安裝溫度傳感器 Temperature Monitor & PWM Fan Controller RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6663AEE-T | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6664AEE | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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