参数资料
| 型号： | ADT7475EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 32/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7475 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7475 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7475EB EVAL-ADT7475EB-ND |
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ADT7475
? PWM3 (rear chassis fan) is controlled by the Remote 1
Temperature (ambient).
Example Mux Settings
Bits <7:5> (BHVR), PWM1 Configuration Register (0x5C)
101 = Fastest speed calculated by local and Remote 2
temperature controls PWM1
Bits <7:5> (BHVR), PWM2 Configuration Register (0x5D)
000 = Remote 1 temperature controls PWM2
Bits <7:5> (BHVR), PWM3 Configuration Register (0x5E)
000 = Remote 1 temperature controls PWM3
These settings configure the mux, as shown in Figure 47.
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
MUX
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1 CPU FAN SINK
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 47. Mux Configuration Example
REAR CHASSIS
Step 3: T MIN Settings for Thermal Calibration Channels
T MIN is the temperature at which the fans turn on under
automatic fan control. The speed at which the fan runs at
Table 40. T MIN REGISTERS
Register Description
Default
T MIN is programmed later in the process. The T MIN values
chosen are temperature channel specific, for example, 25 ° C
for ambient channel, 30 ° C for VRM temperature, and 40 ° C
for processor temperature.
0x67
0x68
0x69
Remote 1 Temperature T MIN
Local Temperature T MIN
Remote 2 Temperature T MIN
0x5A (90 ° C)
0x5A (90 ° C)
0x5A (90 ° C)
T MIN is an 8-bit value, either twos complement or
Offset 64, that can be programmed in 1 ° C increments. There
is a T MIN register associated with each temperature
measurement channel: Remote 1, local, and Remote 2
temperatures. Once the T MIN value is exceeded, the fan turns
on and runs at the minimum PWM duty cycle. The fan turns
off once the temperature has dropped below T MIN ? T HYST .
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Startup
Timeout Section for more details. In some cases, primarily
for psycho-acoustic reasons, it is desirable that the fan never
switch off below T MIN . Bits <7:5> of Enhanced Acoustics
Register 1 (0x62), when set, keep the fans running at the
PWM minimum duty cycle, if the temperature should fall
below T MIN .
Enhanced Acoustics Register 1 (0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty
cycle below T MIN ? T HYST .
Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty
cycle below T MIN ? T HYST .
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T MIN ? T HYST .
http://onsemi.com
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| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
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