參數(shù)資料
型號: ADT7473ARQZ-1REEL7
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝: ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù): 29/72頁
文件大?。?/td> 1494K
代理商: ADT7473ARQZ-1REEL7
ADT7473/ADT7473-1
Rev. C | Page 35 of 72
STEP 2: CONFIGURING THE MUX
After the system hardware configuration is determined, the fans
can be assigned to particular temperature channels. Not only
can fans be assigned to individual channels, but the behavior of
the fans is also configurable. For example, fans can be run under
automatic fan control, manually (under software control), or at
the fastest speed calculated by multiple temperature channels.
The mux is the bridge between temperature measurement
channels and the three PWM outputs.
Bits [7:5] (BHVR) of Register 0x5C, Register 0x5D, and
Register 0x5E (PWM configuration registers) control the
behavior of the fans connected to the PWM1, PWM2, and
PWM3 outputs. The values selected for these bits determine
how the mux connects a temperature measurement channel
to a PWM output.
Automatic Fan Control Mux Options
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0x5E.
000 = Remote 1 temperature controls PWMx
001 = Local temperature controls PWMx
010 = Remote 2 temperature controls PWMx
101 = Fastest speed calculated by local and Remote 2
temperature controls PWMx
110 = Fastest speed calculated by all three temperature
channel controls PWMx
The fastest speed calculated options pertain to controlling one
PWM output based on multiple temperature channels. The
thermal characteristics of the three temperature zones can be
set to drive a single fan. An example is the fan turning on when
Remote 1 temperature exceeds 60°C, or if the local temperature
exceeds 45°C.
Other Mux Options
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0x5E.
011 = PWMx runs full speed (default for ADT7473-1)
100 = PWMx disabled (default for ADT7473)
111 = manual mode
In normal mode, PWMx runs under software control. In this
mode, PWM duty cycle registers (Register 0x30 to Register
0x32) are writable and control the PWM outputs.
MUX
04
68
6-
04
9
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
Figure 52. Assigning Temperature Channels to Fan Channels
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ADT7473ARQZ-1REEL DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
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相關代理商/技術參數(shù)
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