参数资料
型号: ADT7468ARQ
厂商: ON Semiconductor
文件页数: 47/81页
文件大小: 0K
描述: IC REMOTE THERMAL CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
标准包装: 56
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: -40°C ~ 120°C,外部传感器
精确度: ±2°C(最小值)
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: -40°C ~ 120°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: 管件
ADT7468
T RANGE
100%
100%
PWM MAX
PWM MIN
PWM MIN
0%
0%
T MIN
TEMPERATURE
T MIN
TEMPERATURE
Figure 61. PWM MAX Determines Maximum PWM Duty Cycle Below the
THERM Temperature Limit
Programming the PWM MAX Registers
The PWM MAX registers are 8-bit registers that allow the
Figure 62. T RANGE Parameter Affects Cooling Slope
The T RANGE or fan control slope is determined by the following
procedure:
maximum PWM duty cycle for each output to be configured
anywhere from 0% to 100%. This allows the maximum PWM
duty cycle to be set in steps of 0.39%.
The value to be programmed into the PWM MAX register is given
by
Value (decimal) = PWM MAX /0.39
Example 1: For a maximum PWM duty cycle of 50%,
Value (decimal) – 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 80 (hex)
Example 2: For a minimum PWM duty cycle of 75%,
Value (decimal) = 75/0.39 = 85 (decimal)
Value = 192 (decimal) or C0 (hex)
PWM MAX Registers
Reg. 0x38, PWM1 Maximum Duty Cycle = 0xFF (100% default)
Reg. 0x39, PWM2 Maximum Duty Cycle = 0xFF (100% default)
1.
2.
3.
4.
Determine the maximum operating temperature for that
channel (for example, 70°C).
Determine experimentally the fan speed (PWM duty cycle
value) that does not exceed the temperature at the worst-
case operating points. (For example, 70°C is reached when
the fans are running at 50% PWM duty cycle.)
Determine the slope of the required control loop to meet
these requirements.
Using the ADT7468 evaluation software, you can
graphically program and visualize this functionality. Ask
your local Analog Devices representative for details.
100%
50%
33%
0%
Reg. 0x3A, PWM3 Maximum Duty Cycle = 0xFF
(100% default)
See the Note on Fan Speed and PWM Duty Cycle.
STEP 6: T RANGE for Temperature Channels
T RANGE is the range of temperature over which automatic fan
control occurs once the programmed T MIN temperature has
been exceeded. T RANGE is a temperature slope, not an arbitrary
value; that is, a T RANGE of 40°C holds true only for PWM MIN =
33%. If PWM MIN is increased or decreased, the effective T RANGE
30°C
40°C
T MIN
Figure 63. Adjusting PWM MIN Affects T RANGE
T RANGE is implemented as a slope, which means that as PWM MIN
is changed, T RANGE changes, but the actual slope remains the
same. The higher the PWM MIN value, the smaller the effective
T RANGE , that is, the fan reaches full speed (100%) at a lower
temperature.
changes.
Rev. 3 | Page 47 of 81 | www.onsemi.com
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