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参数资料
| 型号： | ADM1027ARQZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 35/56页 |
| 文件大小： | 1822K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 标准包装： | 1,000 |
| 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： | 无 |
| 输出风扇： | 是 |
| 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) |
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ADM1027
Step 7
Determine T
HYST
for Each Temperature Channel
T
HYST
is the amount of extra cooling a fan provides after the
measured temperature has dropped back below T
MIN
before the
fan turns off. The premise for temperature hysteresis (T
HYST
)
is that without it, the fan would merely chatter, or cycle on and
off regularly, whenever the temperature is hovering about the
T
MIN
setting.
The T
HYST
value chosen will determine the amount of time
needed for the system to cool down or heat up, as the fan is
turning on and off. Values of hysteresis are programmable in
the range 1rC to 15rC. Larger values of T
HYST
prevent the fans
chattering on and off as previously described. The T
HYST
default
value is 4rC.
Hysteresis Registers
Reg. 0x6D Remote 1, Local Hysteresis Register
<7:4> = Remote 1 temperature hysteresis (default = 4rC)
<3:0> = Local temperature hysteresis (default = 4rC)
Reg. 0x6E Remote 2 Temperature Hysteresis Register
<7:4> = Remote 2 temperature hysteresis (default = 4rC)
Note that in some applications it is required that the fans not
turn off below T
MIN
, but remain running at PWM
MIN
. Bits <7:5>
of Enhance Acoustics Register 1 (Reg. 0x62) allow the fans to
be turned off or kept spinning below T
MIN
. If the fans are always
on, the T
HYST
value has no effect on the fan when the tempera-
ture drops below T
MIN
.
Enhance Acoustics Register 1 (Reg. 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
.
0%
100%
T
RANGE
T
HYST
T
MIN
T
THERM
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
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
TACH1
CPU
FANSINK
FRONT
CHASSIS
REAR
CHASSIS
PWM3
TACH3
PWM2
TACH2
Figure 36. The T
HYST
Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
Rev. 3 | Page 35 of 56 | www.onsemi.com
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