参数资料
型号: ADT7462ZEVB
厂商: ON Semiconductor
文件页数: 35/82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
ADT7462
Step 2 ? T MIN Settings for Thermal Calibration
Channels
T MIN is the temperature at which the fans start to turn on
under automatic fan control. The speed at which the fan runs
at T MIN is programmed later. The T MIN values chosen are
temperature channel-specific; for example, 25 ? C for
ambient channel, 30 ? C for VRM temperature, and 40 ? C for
processor temperature.
MUX
T MIN is an 8-bit value, either twos complement or Offset
64, that can be programmed in 1 ? C increments. There is a
T MIN register associated with each temperature measurement
channel: local, Remote 1, Remote 2, and Remote 3. When the
T MIN value is exceeded, the fan turns on and runs at the
minimum PWM duty cycle. The fan turns off after the
temperature has dropped below T MIN ? T HYST .
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM1
ENHANCEMENT)
REMOTE1 =
AMBIENT TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
RAMP
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CAHSSIS
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE2 =
CPU TEMP
Figure 52. Assigning Temperature Channels to Fan Channels
REAR CAHSSIS
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Spin-Up
section for more details. In some cases, primarily for
psycho-acoustic reasons, the fan should never switch off
below T MIN . The corresponding bits in Register 0x25 and
Register 0x26 should be set to keep the fans running at the
PWM minimum duty cycle, if the temperature falls below
T MIN .
T MIN Registers
Register 0x5C, Local Temperature T MIN = 0x9A (90 ? C)
Register 0x5D, Remote 1 Temperature T MIN = 0x9A (90 ? C)
Register 0x5E, Remote 2 Temperature T MIN = 0x9A (90 ? C)
Register 0x5F, Remote 3 Temperature T MIN = 0x9A (90 ? C)
PWM1 and PWM2 Frequency Register (0x25)
Bit 0 (MIN 1) = 0. PWM1 is off (0% PWM duty cycle)
Bit 0 (MIN 1) = 1. PWM1 runs at PWM1 minimum duty
cycle below T MIN ? T HYST .
Bit 1 (MIN 2) = 0. PWM2 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 1 (MIN 2) = 1. PWM2 runs at PWM2 minimum duty
cycle below T MIN ? T HYST .
PWM3 and PWM4 Frequency Register (0x26)
Bit 0 (MIN 3) = 0. PWM3 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 0 (MIN 3) = 1. PWM3 runs at PWM3 minimum duty
cycle below T MIN ? T HYST .
Bit 1 (MIN 4) = 0. PWM4 is off (0% PWM duty cycle) when
temperature is below T MIN ? T HYST .
Bit 1 (MIN 4) = 1. PWM4 runs at PWM4 minimum duty
cycle below T MIN ? T HYST .
when temperature is below T MIN ? T HYST .
http://onsemi.com
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