ADT7476A
http://onsemi.com
32
Step 1 Hardware Configuration
During system design, the motherboard sensing and
control capabilities should be addressed early in the design
stages. Decisions about how these capabilities are used
should involve the system thermal/mechanical engineer.
Ask the following questions:
1. What ADT7476A functionality is used?
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> PWM2 or SMBALERT
?
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> TACH4 fan speed measurement or
overtemperature THERM
function?
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> 2.5 V voltage monitoring or overtemperature
THERM
function?
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> 12 V voltage monitoring or VID5 input?
The ADT7476A offers multifunctional pins that
can be reconfigured to suit different system
requirements and physical layouts. These
multifunction pins are software programmable.
2. How many fans are supported in system, three or
four?
This influences the choice of whether to use the
TACH4 pin or to reconfigure it for the THERM
function.
3. Is the CPU fan to be controlled using the
ADT7476A, or will the CPU fan run at full speed
100% of the time?
If run at 100%, this frees up a PWM output, but
the system is louder.
4. Where will the ADT7476A be physically located
in the system?
This influences the assignment of the temperature
measurement channels to particular system
thermal zones. For example, locating the
ADT7476A close to the VRM controller circuitry
allows the VRM temperature to be monitored
using the local temperature channel.
Figure 48. Hardware Configuration Example
THERMAL CALIBRATION
REMOTE1 =
AMBIENT TEMP
100%
0%
T
MIN
T
RANGE
PWM
MIN
MUX
S
TACHOMETER1
MEASUREMENT
S
S
PWM
MIN
PWM
MIN
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
THERMAL CALIBRATION
100%
0%
T
MIN
T
RANGE
LOCAL =
VRM TEMP
REMOTE2 =
CPU TEMP
TACHOMETER2
MEASUREMENT
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
TACHOMETER3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
GENERATOR
PWM1
PWM2
PWM3
TACH3
TACH2
TACH1
CPU FAN SINK
FRONT CHASSIS
REAR CHASSIS
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
CONFIG
PWM
GENERATOR
PWM
CONFIG
PWM
GENERATOR
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