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參數(shù)資料
| 型號(hào)： | 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(fēng)扇控制器 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 297K |
| 代理商： | MAX6653 |
M
Temperature Monitors and
PWM Fan Controllers
10
______________________________________________________________________________________
INT
is an open-drain digital output that reports the sta-
tus of temperature interrupt limits and fan out-of-limit
conditions. Set bit 1 of configuration register 1 (00h) to
1 to enable
INT
output or reset this bit to zero to disable
the
INT
output function. Status register 1 contains sta-
tus information for the conditions that cause
INT
to
assert. Reading status register 1 resets
INT
, but
INT
is
reasserted if the fault condition still exists. Connect a
10k
pullup resistor between
INT
and V
CC
.
SDL
and
SDR
are open-drain digital outputs on the
MAX6653 that can be used to shut the system down
based on the local (die) temperature of the MAX6653 or
the temperature of the remote sensor, respectively. The
trip thresholds for
SDL
and
SDR
are normally set above
the
THERM
and
INT
limits. Their power-up values are
set by the CRIT1 and CRIT0 pins, as shown in Table 1.
Fan-Speed Control
The MAX6653/MAX6663/MAX6664 fan-control section
can operate in one of three modes depending on the set-
ting of bit 7 to bit 5 of configuration register 1 (00h).
Regardless of the mode of operation, the PWM output fre-
quency is programmable, and the fan speed is measured
with the result stored in the fan-speed register (08h).
PWM Output Frequency
The PWM output frequency is programmed by bit 5, bit
4, and bit 3 of the fan characteristics register (20h),
regardless of the mode of operation. See Table 7.
Fan-Control Mode
The mode of fan-speed control operation is set by bit 7,
bit 6, and bit 5 in configuration register 1 (00h), as
shown in Table 8.
PWM Duty-Cycle Fan-Control Mode
Bits [3:0] of the fan-speed configuration register set the
PWM duty cycle. See Table 9 for more details.
RPM Select Fan-Control Mode
In RPM select mode, the MAX6653/MAX6663/MAX6664
adjust their PWM output duty cycle to match a selected
fan speed measured by a tachometer count value. Before
selecting this mode by setting bits [7:5] of configuration
register 1 (00h) to 0x1, the desired tachometer count
value should be written to the fan tachometer high-limit
register (10h). In this mode, the MAX6653/MAX6663/
MAX6664 are not able to detect underspeed fan faults
because the fan tachometer high-limit register (10h) func-
tions as the target tachometer count.
The MAX6653/MAX6663/MAX6664 detect fan stall
faults by comparing the fan-speed reading to the full-
scale constant of 254 (FEh). Therefore, the
MAX6653/MAX6663/MAX6664 signal a fan fault when
the fan-speed reading is 255 (FFh). Note that the RPM
mode cannot be used for speeds below 10% of the
fan
’
s maximum speed. It is important to verify that a fan
works properly at lower RPM values if a low-RPM oper-
ation in this mode is desired.
Bits [7:5]
MODE OF OPERATION
DESCRIPTION
0x0
PWM duty-cycle mode
Directly program the PWM duty cycle by writing to bits [3:0] of the fan-speed
configuration register (22h).
0x1
RPM select mode
Program the desired fan speed by writing to the fan tachometer high-limit register
(10h). This value should be written after selecting the RPM mode. The
MAX6653/MAX6663/MAX6664 then adjust the PWM duty cycle to cause the fan to
spin at the programmed speed.
100
Automatic mode
PWM duty cycle is automatically controlled by the remote temperature.
111
Automatic mode
PWM duty cycle is automatically controlled by both the remote and the local
temperatures. See the
Automatic Fan-Control Mode
section.
Table 8. Setting the Fan-Speed Control Mode (Default = 100)
FAN CHARACTERISTICS REGISTER
(20H) POR = 011
BIT 5
0
0
0
0
1
1
1
1
BIT 4
0
0
1
1
0
0
1
1
BIT 3
0
1
0
1
0
1
0
1
PWM
FREQUENCY
(Hz)
11.7
15.6
23.4
31.25
37.5
46.9
62.5
93.5
Table 7. Setting PWM Output Frequency
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相關(guān)代理商/技術(shù)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(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 |
| 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(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 |
| 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(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 |
| 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(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 |
| 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(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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