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ADM1027 Datasheet(PDF) 34 Page - Analog Devices

Part # ADM1027
Description  dBCOOL-TM Remote Thermal Controller and Voltage Monitor
PDF  56 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM1027 Datasheet(HTML) 34 Page - Analog Devices

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REV. A
–34–
ADM1027
Step 6
Determine TTHERM for Each Temperature Channel
TTHERM is the absolute maximum temperature allowed on a
temperature channel. Above this temperature, a component such
as the CPU or VRM may be operating beyond its safe operating
limit. When the measured temperature exceeds TTHERM, all fans
are driven at 100% PWM duty cycle (full speed) to provide
critical system cooling. The fans remain running at 100% until
the temperature drops below TTHERM – hysteresis. The hysteresis
value is 4
∞C.
The TTHERM limit should be considered the maximum worst-
case operating temperature of the system. Since exceeding any
TTHERM limit runs all fans at 100%, it has very negative acoustic
effects. Ultimately, this limit should be set up as a fail-safe, and
the user should ensure that it is not exceeded under normal
system operating conditions.
Note that the TTHERM limits are nonmaskable and affect the fan
speed no matter what automatic fan control settings are config-
ured. This allows some flexibility since a TRANGE value can be
selected based on its slope, while a hard limit, e.g., 70
∞C, can be
programmed as TMAX (the temperature at which the fan reaches
full speed) by setting TTHERM to 70
∞C.
THERM hysteresis is 4
∞C.
THERM Registers
Reg. 0x6A Remote 1 THERM Limit = 0x64 (100
∞C default)
Reg. 0x6B Local Temperature THERM Limit = 0x64
(100
∞C default)
Reg. 0x6C Remote 2 THERM Limit = 0x64 (100
∞C default)
T
MIN
0%
100%
TTHERM
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%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
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
TRANGE
Figure 35. Understanding How TTHERM Relates to Automatic Fan Control



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