参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 43/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
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 run under
automatic fan control, they can run manually (under software
control), or they can run 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 Registers 0x5C, 0x5D, and 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
<7:5> (BHVR), Registers 0x5C, 0x5D, 0x5E.
000 = Remote 1 temperature controls PWMx
001 = local temperature controls PWMx
010 = Remote 2 temperature controls PWMx
MUX
101 = Fastest speed calculated by local and Remote 2
temperature controls PWMx
110 = Fastest speed calculated by all three temperature
channels 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 would be the fan turning
on when Remote 1 temperature exceeds 60°C or if the local
temperature exceeds 45°C.
Other MUX Options
<7:5> (BHVR), Registers 0x5C, 0x5D, 0x5E.
011 = PWMx runs full speed
100 = PWMx disabled (default)
111 = manual mode. PWMx is runner under software
control. In this mode, PWM duty cycle registers
(Registers 0x30 to 0x32) are writable and control the
PWM outputs.
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM1
REMOTE 1 =
AMBIENT TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
TACH1
CPU FAN SINK
RAMP
MUX
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM2
ENHANCEMENT)
T MIN
T RANGE
0%
PWM
TACHOMETER 2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CHASSIS
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER 3
AND 4
MEASUREMENT
TACH3
REMOTE 2 =
CPU TEMP
Figure 56. Assigning Temperature Channels to Fan Channels
Rev. 3 | Page 43 of 81 | www.onsemi.com
REAR CHASSIS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
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