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參數(shù)資料
| 型號： | MAX6653 |
| 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風扇控制器 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 297K |
| 代理商： | MAX6653 |
M
Temperature Monitors and
PWM Fan Controllers
______________________________________________________________________________________
11
Automatic Fan-Control Mode
Automatic fan-speed control is selected by setting bits
[7:5] of configuration register 1 (00h) to 100 (to control
speed based on the remote temperature) or 101 (to
control speed based on both remote and local temper-
ature). Program a threshold, or starting temperature
TMIN, and the desired temperature range, T
RANGE
, into
the local temp T
MIN
/T
RANGE
register (24h) for local
temperature and into the remote temp T
MIN
/T
RANGE
register (25h) for remote temperature (Tables 10 and
11). If the fan control responds to both local and remote
temperatures, the higher PWM duty cycle has priority.
When the temperature exceeds T
MIN
, the fan is
enabled at a minimum duty cycle programmed in bits
[3:0] of the fan-speed configuration register (22h). The
duty cycle increases in proportion to the temperature
difference and reaches 100% at a temperature equal to
(T
MIN
+ T
RANGE
). A hysteresis of 5
°
C is built into the
T
MIN
set point to prevent the fan from starting and stop-
ping when the temperature is at the set point.
Spin-Up
To ensure proper fan startup, the MAX6653/MAX6663/
MAX6664 can be set to drive the fan to 100% duty
cycle for a short period on startup, and then revert to
the correct duty cycle. The spin-up time is programmed
by bits [2:0] in the fan characteristics register (20h).
The spin-up feature can be disabled by setting bit 7 of
the fan-filter register (23h) to 1; POR value is zero.
Table 12 shows programming of the spin-up time.
Fan-Filter Mode
When the MAX6653/MAX6663/MAX6664 are used for
automatic fan-speed control, the fan-filter mode helps
minimize the audible effects of varying fan speeds. The
fan-filter mode limits the rate at which fan speed can
change. Each time a new temperature measurement is
made, the fan-filter mode allows the PWM duty cycle to
increment by a selectable amount. The duty cycle can
change by 1/240, 2/240, 4/240, or 8/240 (0.416%,
0.833%, 1.667%, or 3.333%) of the PWM period after
each temperature-monitoring cycle. This prevents sud-
den changes in fan speed, even when temperature
changes suddenly.
The filter mode is set by bit 0 of the fan-filter register
(23h). To enable the fan-filter mode, write a 1 to this bit.
Bits [6:5] of the same register control the size of the
PWM steps.
Note that the rate of change depends on both the value
selected by the fan-filter bits and on the temperature
BITS [3:0] OF FAN-SPEED
CONFIGURATION REGISTER (22h)
BIT 3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
BIT 2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
BIT 1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BIT 0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
% DUTY
CYCLE (%)
0
7
14
20
27
33
40
47
53
60
67
73
80
87
93
100
Table 9. Setting PWM Duty Cycle
Table 10. T
RANGE
Fan-Control Temperature
Range Bits [2:0] T
MIN
/T
RANGE
Registers
(24h and 25h)
—
POR = 001
BIT 2
BIT 1
BIT 0
TEMPERATURE
RANGE (
°
C)
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
5
10
20
40
80
Table 11.T
MIN
Fan-Control Start
Temperature; Bits [7:3] T
MIN
/T
RANGE
Registers (24h
—
POR = 01000 and
25h
—
POR = 01100
BIT 7
BIT 6
BIT5
BIT 4
BIT3
MSB = +64
°
C
LSB = +4
°
C
Min threshold = 0
°
C
Max threshold = +127
°
C
LSB/step size = +4
°
C
POR = +48
°
C or 01100b
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6653AEE | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6653AEE+ | 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6653AEE+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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6653AEE-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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6653EVKIT | 功能描述:板上安裝溫度傳感器 Evaluation System/Evaluation Kit for the MAX6653 MAX6663 MAX6664 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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