参数资料
型号: ADM1027ARQ-REEL
厂商: ON Semiconductor
文件页数: 29/56页
文件大小: 1822K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
Product Discontinuation Notice 25/Aug/2008
标准包装: 2,500
系列: dBCool®
功能: 风扇控制,温度监控器
传感器类型: 内部和外部
感应温度: 0°C ~ 105°C,外部传感器
精确度: ±1°C
拓扑: ADC,比较器,风扇速度计数器,多路复用器,寄存器库
输出类型: SMBus?
输出警报:
输出风扇:
电源电压: 3 V ~ 5.5 V
工作温度: 0°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
供应商设备封装: 24-QSOP
包装: 带卷 (TR)
REV. A
ADM1027
29
Step 2
Configuring the Mux: Which Temperature Controls Which Fan?
Having decided on the system hardware configuration, the fans
can be assigned to particular temperature channels. Not only
can fans be assigned to individual channels, but how a fan
behaves is configurable. For example, fans can run under
automatic fan control, manually (software control), or 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 bits) 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 temp controls PWMx
001 = Local temp controls PWMx
010 = Remote 2 temp controls PWMx
101 = Fastest speed calculated by local and remote 2 temp
controls PWMx
110 = Fastest speed calculated by all three temperature channels
controls PWMx
The fastest speed calculated options refer to the ability to con-
trol one PWM output based on multiple temperature channels.
While the thermal characteristics of the three temperature zones
can be set up differently, they can drive a single fan. An example
would be if the fan turns on when Remote 1 temp exceeds 60rC
or local temp exceeds 45rC.
Other Mux Options
<7:5> (BHVR) REGISTERS 0x5C, 0x5D, 0x5E
011 = PWMx runs full-speed (default).
100 = PWMx disabled.
111 = Manual Mode. PWMx is run under software control. In
this mode, PWM duty cycle registers (Reg. 0x30 to 0x32) are
writable and control the PWM outputs.
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
TACH1
CPU
FANSINK
FRONT
CHASSIS
REAR
CHASSIS
PWM3
TACH3
PWM2
TACH2
MUX
TACHOMETER 1
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
TACHOMETER 2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
TACHOMETERS 3
AND 4
MEASUREMENT
PWM
GENERATOR
PWM
GENERATOR
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
PWM
GENERATOR
PWM
CONFIG
PWM
MIN
MUX
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
PWM
MIN
PWM
MIN
PWM
CONFIG
PWM
CONFIG
Figure 28. Assigning Temperature Channels to Fan Channels
Rev. 3 | Page 29 of 56 | www.onsemi.com
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