ADT7463 Analog Devices, ADT7463 Datasheet - Page 5

• Manufacturer Part Number: ADT7463
• Description: Dbcool Thermal Management Controller And Voltage Monitor
• Manufacturer: Analog Devices

STEP 2: CONFIGURING THE MUX—WHICH
TEMPERATURE CONTROLS WHICH FAN?
After the system hardware configuration is determined,
the fans can be assigned to particular temperature chan-
nels. Not only can fans be assigned to individual
channels, but the behavior of fans is also configurable.
For example, fans can be run under automatic fan con-
trol, can run manually (under software control), or can
run at the fastest speed calculated by multiple tempera-
ture channels. The MUX is the bridge between
temperature measurement channels and the three PWM
outputs.
Bits <7:5> (BHVR bits) of registers 0x5C, 0x5D, and 0x5E
(PWM configuration registers) control the behavior of
the fans connected to the PWM1, PWM2, and PWM3 out-
puts. The values selected for these bits determine how
the MUX connects a temperature measurement channel
to a PWM output.
REV. 0
AMBIENT TEMP
REMOTE 2 =
REMOTE 1 =
VRM TEMP
CPU TEMP
LOCAL =
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
MIN
MIN
MIN
Figure 5. Assigning Temperature Channels to Fan Channels
T
T
T
RANGE
RANGE
RANGE
100%
100%
0%
100%
0%
0%
MUX
MUX
PWM
–5–
PWM
PWM
MIN
MIN
MIN
RAMP CONTROL
ENHANCEMENT)
RAMP CONTROL
RAMP CONTROL
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
AUTOMATIC FAN CONTROL MUX OPTIONS
<7:5> (BHVR) REGISTERS 0x5C, 0x5D, 0x5E
000 = Remote 1 Temp controls PWMx
001 = Local Temp controls PWMx
010 = Remote 2 Temp controls PWMx
101 = Fastest Speed calculated by Local and Remote 2
Temp controls PWMx
110 = Fastest Speed calculated by all three temperature
channels controls PWMx
The "Fastest Speed Calculated" options pertain to the
ability to control 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 would be if the fan turns on
when Remote 1 temperature exceeds 60°C or if the local
temperature exceeds 45°C.
OTHER MUX OPTIONS
<7:5> (BHVR) REGISTERS 0x5C, 0x5D, 0x5E
011 = PWMx runs full speed (default)
100 = PWMx disabled
111 = Manual Mode. PWMx is run under software control.
In this mode, PWM duty cycle registers (registers 0x30 to
0x32) are writable and control the PWM outputs.
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
AND 4
GENERATOR
GENERATOR
GENERATOR
CONFIG
CONFIG
PWM
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
AN-613
CPU
FAN SINK
FRONT
CHASSIS
REAR
CHASSIS