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ADT7467
T LOW T MIN Operating T THERM
T HIGH
T RANGE
T LOW If the temperature drops below the T LOW limit,
T HIGH If the temperature exceeds the T HIGH limit, an
operating temperature is 50 ? C. The ADT7467 dynamically
alters the control solution to maintain each zone temperature
as closely as possible to its target operating point.
Operating Point Registers
Register 0x33, Remote 1 Operating Point = 0xA4
(100 ? C Default)
Register 0x34, Local Operating Point = 0xA4
(100 ? C Default)
Register 0x35, Remote 2 Operating Point = 0xA4
(100 ? C Default)
TEMPERATURE
Point
Figure 51. Dynamic T MIN Control Loop
Figure 51 shows an overview of the parameters that affect
the operation of the dynamic T MIN control loop.
Table 37 provides a brief description of each parameter.
Table 37. T MIN CONTROL LOOP PARAMETERS
Parameter Description
an error flag is set in a status register and an
SMBALERT interrupt can be generated.
error flag is set in a status register and an
SMBALERT interrupt can be generated.
Speed Control Loop section, and then proceed with dynamic
T MIN control mode programming.
Programming the Automatic Fan Speed Control Loop
To more efficiently understand the automatic fan speed
control loop, it is strongly recommended to use the
ADT7467 evaluation board and software while reading this
section.
This section provides the system designer with an
understanding of the automatic fan control loop and
provides step-by-step guidance on effectively evaluating
and selecting critical system parameters. To optimize the
system characteristics, the designer should consider several
aspects of the system configuration, including the number of
fans, where fans are located, and what temperatures are
measured.
The mechanical or thermal engineer who is tasked with
the system thermal characterization should also be involved
at the beginning of the process.
STEP 1: Hardware Configuration
The motherboard sensing and control capabilities should
be addressed in the early stages of designing a system, and
decisions about how these capabilities are used should
involve the system’s thermal/mechanical engineer. Ask the
following questions:
1. What ADT7467 functionality will be used?
PWM2 or SMBALERT
TACH4 fan speed measurement or overtemperature
THERM function
5 V voltage monitoring or overtemperature THERM
function
12 V voltage monitoring or VID5 input
The ADT7467 offers multifunctional pins that can
be reconfigured to suit different system
requirements and physical layouts. These
T MIN
Operating
Point
T THERM
T RANGE
The temperature at which the fan turns on in
automatic fan speed control mode.
The target temperature for a particular
temperature zone. The ADT7467 attempts to
maintain system temperature at
approximately the operating point by adjusting
the T MIN parameter of the control loop.
If the temperature exceeds this critical limit,
the fans can run at 100% for maximum
cooling.
Programs the PWM duty cycle vs.
temperature control slope.
multifunction pins are software programmable.
2. How many fans will be supported in the system,
three or four? This influences the choice of
whether to use the TACH4 pin or to reconfigure it
for the THERM function.
3. Will the CPU fan be controlled using the
ADT7467, or will it run at full speed 100% of the
time?
Running it at 100% frees up a PWM output, but
the system is louder.
4. Where will the ADT7467 be physically located in
the system?
Dynamic T MIN Control Programming
Because the dynamic T MIN control mode is a basic
extension of the automatic fan control mode, program the
automatic fan control mode parameters as described in
Step 1 to Step 8 in the Programming the Automatic Fan
http://onsemi.com
33
This influences the assignment of the temperature
measurement channels to particular system
thermal zones. For example, locating the
ADT7467 close to the VRM controller circuitry
allows the VRM temperature to be monitored
using the local temperature channel.
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