参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 52/81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
T RANGE
100%
0%
T MIN
T THERM
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM1
REMOTE 2 =
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
TACH1
CPU FAN SINK
CPU TEMP
RAMP
MUX
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM2
ENHANCEMENT)
T MIN
T RANGE
0%
PWM
TACHOMETER 2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CHASSIS
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER 3
AND 4
MEASUREMENT
TACH3
REMOTE 1 =
AMBIENT TEMP
REAR CHASSIS
Figure 69. The T HYST Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
Enhance Acoustics Register 1 (Reg. 0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when the
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 the
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 the
temperature is below T MIN ? T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty cycle
below T MIN ? T HYST .
STEP 9: OPERATING POINTS FOR TEMPERATURE
CHANNELS
The operating point for each temperature channel is the
optimal temperature for that thermal zone. The hotter each
zone is allowed to be, the quieter the system, because the fans
are not required to run as fast. The ADT7468 increases or
decreases fan speeds as necessary to maintain the operating
point temperature, allowing for system-to-system variation and
removing the need for worst-case design. If a sensible operating
point value is chosen, any T MIN value can be selected in the
system characterization. If the T MIN value is too low, the fans run
sooner than required, and the temperature is below the operat-
ing point. In response, the ADT7468 increases T MIN to keep the
fans off longer and to allow the temperature zone to get closer
to the operating point. Likewise, too high a T MIN value causes
the operating point to be exceeded, and in turn, the ADT7468
reduces T MIN to turn the fans on sooner to cool the system.
Programming Operating Point Registers
There are three operating point registers, one for each
temperature channel. These 8-bit registers allow the operating
point temperatures to be programmed with 1°C resolution.
Operating Point Registers
Reg. 0x33, Remote 1 operating point = 0xA4 (100°C default)
Reg. 0x34, local operating point = 0xA4 (100°C default)
Reg. 0x35, Remote 2 operating point = 0xA4 (100°C default)
Rev. 3 | Page 52 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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