参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 34/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
PWM1 Frequency Registers (Reg. 0x5F to Reg. 0x61)
<2:0> frequency
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz default
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
FAN SPEED CONTROL
The ADT7468 controls fan speed using two modes: automatic
and manual.
In automatic fan speed control mode, fan speed automatically
varies with temperature, without CPU intervention, once initial
parameters are set up. The advantage is that, if the CPU hangs,
the user is guaranteed that the system is protected from
overheating. The automatic fan speed control incorporates a
feature called dynamic T MIN calibration, which reduces the
design effort required to program the automatic fan speed
control loop. See the Programming the Automatic Fan Speed
Control Loop section.
In manual fan speed control mode, the ADT7468 allows the
duty cycle of any PWM output to be manually adjusted. This
can be useful if the user wants to change fan speed in the
software or adjust PWM duty cycle output for test purposes.
Bits <7:5> of Reg. 0x5C to Reg. 0x5E (PWM Configuration)
control the behavior of each PWM output.
PWM Configuration Register (Reg. 0x5C to Reg. 0x5E)
Once under manual control, each PWM output can be
manually updated by writing to Reg. 0x30 to Reg. 0x32 (PWMx
current duty cycle registers).
Programming the PWM Current Duty Cycle Registers
The PWM current duty cycle registers are 8-bit registers that
allow the PWM duty cycle for each output to be set anywhere
from 0% to 100% in steps of 0.39%. The value to be program-
med into the PWM MIN register is given by
Value (decimal) = PWM MIN /0.39
Example 1 : For a PWM duty cycle of 50%,
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hex)
Example 2 : For a PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 (decimal)
Value = 85 (decimal) or 0x54 (hex)
PWM Duty Cycle Registers
Reg. 0x30 PWM1 duty cycle = 0x00 (0% default)
Reg. 0x31 PWM2 duty cycle = 0x00 (0% default)
Reg. 0x32 PWM3 duty cycle = 0x00 (0% default)
By reading the PWMx current duty cycle registers, the user can
keep track of the current duty cycle on each PWM output, even
when the fans are running in automatic fan speed control mode
or acoustic enhancement mode. See the Programming the
Automatic Fan Speed Control Loop section for details.
<7:5> BHVR
111 = manual mode
Rev. 3 | Page 34 of 81 | www.onsemi.com
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相关代理商/技术参数 |
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| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
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