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ADT7476
Step 3 ? 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.
T MIN is an 8-bit value, either twos complement or Offset
64, which can be programmed in 1 ° C increments. A T MIN
register is associated with each temperature measurement
channel: Remote 1, local, and Remote 2 temperature. Once
the T MIN value is exceeded, the fan turns on and runs at the
minimum PWM duty cycle. The fan turns off once the
temperature has dropped below T MIN ? T HYST .
To overcome fan inertia, the fan is spun up until two valid
TACH rising edges are counted. See the Fan Startup
Timeout section for more details. In some cases, primarily
for psycho-acoustic reasons, it is desirable that the fan never
switch off below T MIN . Setting Bits [7:5] of Enhance
Acoustics Register 1 (0x62) keeps the fans running at the
PWM minimum duty cycle if the temperature should fall
below T MIN .
100%
0%
T MIN
Table 44. T MIN REGISTERS
Register Description Default
0x67 Remote 1 Temperature T MIN 0x5A (90 ° C)
0x68 Local Temperature T MIN 0x5A (90 ° C)
0x69 Remote 2 Temperature T MIN 0x5A (90 ° C)
Enhance Acoustics Register 1 (0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
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
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
temperature is below T MIN – T HYST .
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T MIN – T HYST .
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
PWM
CONFIG
RAMP
TACH1
CPU FAN SINK
MUX
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
PWM
CONFIG
RAMP
FRONT CHASSIS
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 53. Understanding the T MIN Parameter
http://onsemi.com
37
REAR CHASSIS
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