参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 37/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
Programming the PWM MIN Registers
The PWM MIN registers are 8-bit registers that allow the
minimum PWM duty cycle for each output to be configured
anywhere from 0% to 100%. This allows the minimum
PWM duty cycle to be set in steps of 0.39%.
The value to be programmed into the PWM MIN register is
given by:
Value (decimal) = PWM MIN /0.39
Example 1: For a minimum PWM duty cycle of 50%,
100%
PWM MAX
PWM MIN
0%
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hexadecimal)
T MIN
TEMPERATURE
Example 2: For a minimum PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 (decimal)
Value = 85 (decimal) or 0x54 (hexadecimal)
PWM MIN Registers
Register 0x28, Minimum PWM1 Duty Cycle = 0x80
(50% Default)
Register 0x29, Minimum PWM2 Duty Cycle = 0x80
(50% Default)
Register 0x2A, Minimum PWM3 Duty Cycle = 0x80
(50% Default)
Register 0x2B, Minimum PWM4 Duty Cycle = 0x80
(50% Default)
Note on Fan Speed and PWM Duty Cycle
The PWM duty cycle does not directly correlate to fan
speed in rpm. Running a fan at 33% PWM duty cycle does
not equate to running the fan at 33% speed. Driving a fan at
33% PWM duty cycle actually runs the fan at closer to 50%
of its full speed. This is because fan speed in % rpm
generally relates to the square root of PWM duty cycle.
Given a PWM square wave as the drive signal, fan speed in
rpm approximates to:
% fanspeed + PWM duty cycle 10
Step 4 ? PWM MAX for PWM (Fan) Outputs
PWM MAX is the maximum duty cycle that each fan in the
system runs at under the automatic fan speed control loop.
For maximum system acoustic benefit, PWM MAX should be
as low as possible but should be capable of maintaining the
processo r temperature limit at an acceptable level. If the
THERM temperature limit is exceeded, the fans are still
boosted to 100% for fail-safe cooling.
There is one PWM MAX limit (Register 0x2C) for all fan
channels.
Figure 56. PWM MAX Determines Maximum PWM Duty
Cycle Below the THERM Temperature Limit
Programming the PWM MAX Register
The PWM MAX register (0x2C) is an 8-bit register that
allows the maximum PWM duty cycle for the outputs 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 0x80 (hexadecimal)
Example 2: For a maximum PWM duty cycle of 75%,
Value (decimal) = 75/0.39 = 192 (decimal)
Value = 192 (decimal) or 0xC0 (hexadecimal)
PWM MAX Register
Register 0x2C, Maximum PWM1 to PWM4 Duty
Cycle = 0xC0 (75% default)
See the Note on Fan Speed and PWM Duty Cycle section
for more information.
Step 5 ? T RANGE for Temperature Channels
T RANGE is the range of temperatures over which
automatic fan control occurs when the programmed T MIN
temperature is 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 changes.
T RANGE
100%
PWM MIN
0%
T MIN
TEMPERATURE
Figure 57. T RANGE Parameter Affects Cooling Slope
http://onsemi.com
37
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