REV. A
30
ADM1027
Step 3
Determine T
MIN
Setting for Each Thermal Channel
T
MIN
is the temperature at which the fans will 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 will be
temperature channel specific, e.g., 25rC for ambient channel,
30rC for VRM temperature, and 40rC for processor temperature.
T
MIN
is an 8-bit twos complement value that can be pro-
grammed in 1rC increments. There is a T
MIN
register associated
with each temperature measurement channel, Remote 1, Local
and Remote 2 Temp. Once the T
MIN
value is exceeded, the fan
turns on and runs at minimum PWM duty cycle. The fan will
turn off once temperature has dropped below T
MIN
T
HYST
(detailed later).
To overcome fan inertia, the fan is spun up until two valid TACH
rising edges are counted. See the Fan Start-Up Timeout section
for more details. In some cases, primarily for psycho-acoustic
reasons, it is desirable that the fan never switches off below T
MIN
.
Bits <7:5> of Enhance Acoustics Register 1 (Reg. 0x62), when
set, keep the fans running at PWM minimum duty cycle should
the temperature be below T
MIN
.
T
MIN
Registers
Reg. 0x67 Remote 1 Temperature T
MIN
= 0x5A (90rC default)
Reg. 0x68 Local Temperature T
MIN
= 0x5A (90rC default)
Reg. 0x69 Remote 2 Temperature T
MIN
= 0x5A (90rC default)
Enhance Acoustics Reg 1 (Reg. 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
.
T
MIN
0%
100%
TACHOMETER 1
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
TACHOMETER 2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
TACHOMETERS 3
AND 4
MEASUREMENT
PWM
GENERATOR
PWM
GENERATOR
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT
PWM
GENERATOR
PWM
CONFIG
PWM
MIN
MUX
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
TMIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
PWM
MIN
PWM
MIN
PWM
CONFIG
PWM
CONFIG
REMOTE 1 =
AMBIENT TEMP
LOCAL =
VRM TEMP
REMOTE 2 =
CPU TEMP
PWM1
TACH1
CPU
FANSINK
FRONT
CHASSIS
REAR
CHASSIS
PWM3
TACH3
PWM2
TACH2
Figure 29. Understanding T
MIN
Parameter
Rev. 3 | Page 30 of 56 | www.onsemi.com
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