参数资料
型号: ADT7476AARQZ-R
厂商: ON Semiconductor
文件页数: 39/66页
文件大小: 945K
描述: IC REMOTE THERMAL CTLR 24QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
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: -40°C ~ 125°C
精确度: ±2.5%
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 ~ 3.6 V
工作温度: -40°C ~ 125°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)
其它名称: ADT7476AARQZ-R-ND
ADT7476AARQZ-ROSTR
ADT7476A
http://onsemi.com
39
Programming the PWM Maximum Duty Cycle
Registers
The PWM maximum duty cycle registers are 8-bit
registers that allow the 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 maximum
duty cycle 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)
Table 46. PWM MAXIMUM DUTY CYCLE REGISTERS
Register
Description
Default
0x38
PWM1 Maximum Duty Cycle
0xFF (100%)
0x39
PWM2 Maximum Duty Cycle
0xFF (100%)
0x3A
PWM3 Maximum Duty Cycle
0xFF (100%)
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 the temperature range between
PWM
MIN
 and 100% PWM where the fan speed changes
linearly. Otherwise stated, it is the line drawn between the
T
MIN
/PWM
MIN
   and   the   (T
MIN
+ T
RANGE
)/PWM100%
intersection points.
Figure 57. T
RANGE
 Parameter Affects Cooling Slope
T
MIN
100%
0%
TEMPERATURE
PWM
MIN
T
RANGE
The T
RANGE
 is determined by the following procedure:
1. Determine the maximum operating temperature for
that channel (for example, 70癈).
2. Determine experimentally the fan speed (PWM
duty cycle value) that does not exceed the
temperature at the worst-case operating points. For
example, 70癈 is reached when the fans are
running at 50% PWM duty cycle.
3. Determine the slope of the required control loop to
meet these requirements.
4. Using the ADT7476A evaluation software, you
can graphically program and visualize this
functionality.
As PWM
MIN
 is changed, the automatic fan control slope
changes.
Figure 58. Adjusting PWM
MIN
 Changes the Automatic
Fan Control Slope
T
MIN
100%
0%
30癈
33%
50%
As T
RANGE
 is changed, the slope changes. As T
RANGE
gets smaller, the fans reach 100% speed with a smaller
temperature change.
Figure 59. Increasing T
RANGE
 Changes the AFC Slope
T
MIN
100%
0%
30癈
10%
40癈
45癈
54癈
T
MINHYST
Figure 60. Changing PWM
MAX
 Does Not Change the
AFC Slope
T
RANGE
100%
0%
10%
T
MINHYST
MAX
PWM
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