ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 36

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7473
STEP 2: CONFIGURING TH
After the system hardware configuration is determined, the f
can be assigned to particular temperature channels. Not only
can fans be assigned to individual channels, but the behavio
the fans is also configurable. For example, fans can be run
under automatic fan control, manually (under software
control), or at the fastest speed calculated by multiple
tem erature channels. The mux is the bridge between
temp
outp
Bits [7:5] (BHVR) of Register 0x5C, Register 0x5D, and
Re ster 0x5E (PWM configuration registers) control the
beha
PWM3 outputs. The values selected for these bits determine
ho the mux connects a temperature measurement channel
PWM
gi
w
p
uts.
vior of the fans connecte
erature measurement channels and the three PWM
output.
AMBIENT TEMP
REMOTE 1 =
REMOTE 2 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
d to the PWM1, PWM2, and
T
T
T
MIN
MIN
MIN
E MUX
T
T
T
Figure 47. Assigning Temperature Channels to Fan Channels
RANGE
RANGE
RANGE
100%
100%
100%
0%
0%
0%
MUX
r of
to a
Rev. A | Page 36 of 76
ans
MUX
PWM
PWM
PWM
MIN
MIN
MIN
Automatic Fan Control
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0
The fastest speed calculated options pertain to controlling one
PWM output based on multiple temperature channels. Th
thermal characteristics of the three temperature zones can be
set to drive a single fan. An example is the fan turning on when
Remote 1 temperature exceeds 60°C, or if the local temperature
exceeds 45°C.
Other Mux Options
Bits [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0x5E.
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
000 = Remote 1 temperature controls PWMx
001 = Local temperature contr
010 = Remote 2 temperature controls PWMx
101 = Fastest speed calculated by local and Rem
temperature controls PWMx
110 = Fastest speed calculated by all three temperature
channel controls PWMx
011 = PWMx runs full speed
100 = PWMx disabled (default)
111 = manual mode
In normal mode, PWMx runs under software control. In
this mode, PWM duty cycle registers (Register 0x30 to
Register 0x32) are writable and control the PWM outputs.
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
AND 4
GENERATOR
GENERATOR
GENERATOR
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
Mux Options
ols PWMx
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK
ote 2
e
x5E.