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參數(shù)資料
| 型號： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 32/88頁 |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 38 of 88 | www.onsemi.com
STEP 1—CONFIGURING THE MUX
First, the user needs to decide how many temperature channels
are being measured and how many fans need to be controlled
and monitored. When these decisions have been made, the fans
can be assigned to particular temperature channels. Not only
can fans be assigned to individual channels, but the behavior of
the fans is also configurable. For example, fans can be run under
automatic fan control; they can be run manually (under software
control); or they can be run at the fastest speed calculated by
multiple temperature channels. The MUX is the bridge between
temperature measurement channels and the three PWM outputs.
Bits [7:5] (BHVR) of Register 0x21, Register 0x22, Register 0x23,
and Register 0x24 (PWM configuration registers) control the
behavior of the fans connected to the PWM1, PWM2, PWM3,
and PWM4 outputs. The values selected for these bits determine
how the MUX connects a temperature measurement channel to
a PWM output (see Figure 53).
Automatic Fan Control MUX Options
Bits [7:5] (BHVR), of Register 0x21, Register 0x22, Register
0x23, and Register 0x24, control the behavior of the
corresponding PWM outputs (see Table 61 and Table 62).
The fastest speed calculated options pertain to controlling one
PWM output based on multiple temperature channels. The
thermal characteristics of the three temperature zones can be
set to drive a single fan. An example is the fan turning on when
the Remote 1 temperature exceeds 60°C or when the local
temperature exceeds 45°C.
STEP 2—TMIN SETTINGS FOR THERMAL
CALIBRATION CHANNELS
TMIN is the temperature at which the fans start to turn on under
automatic fan control. The speed at which the fan runs at TMIN is
programmed later. The TMIN values chosen are temperature
channel-specific; for example, 25°C for ambient channel, 30°C
for VRM temperature, and 40°C for processor temperature.
TMIN is an 8-bit value, either twos complement or Offset 64, that
can be programmed in 1°C increments. There is a TMIN register
associated with each temperature measurement channel: local,
Remote 1, Remote 2, and Remote 3. When the TMIN 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 TMIN THYST.
MUX
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
055
69-
041
Figure 53. Assigning Temperature Channels to Fan Channels
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