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ADT7473 Datasheet(PDF) 53 Page - Analog Devices

Part # ADT7473
Description  dBCool Remote Thermal Monitor and Fan Controller
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADT7473 Datasheet(HTML) 53 Page - Analog Devices

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ADT7473
Rev. A | Page 53 of 76
Enabling the THERM Trip Point as the Oper
Bits [4:2] of Dynamic
ating Point
TMIN Control Register 1 (0x36)
enable/disable THERM monitoring to program the operating
point.
Dynamic TMIN Control Register 1 (0x36)
Bit [4] PHTR2 = 1, copies the Remote 2 current temperature to
the Remote 2 operating point register, if THERM is asserted.
ture at which THERM
The operating point contains the tempera
ossible
with
mance.
PHT
is asserted. This allows the system to run as quietly as p
out affecting system perfor
R2 = 0, ignores any THERM assertions. The Remote 2
oper
rogrammed value.
Bit [3] P
l current temperature to the
loca
t register if THERM
ating point register reflects its p
HTL = 1, copies the loca
l temperature operating poin
is
asse
ntains the temperature at which
THE
rted. The operating point co
RM is asserted. This allows the system to run as quietly as
poss
erformance.
ible without affecting system p
PHTL = 0, ignores any THERM assertions. The local
rammed
valu
Bit [
ote 1 current temperature to
the R
ter if THERM
temperature operating point register reflects its prog
e.
2] PHTR1 = 1, copies the Rem
emote 1 operating point regis
is asserted.
The
e temperature at which THERM
operating point contains th
is as
to run as quietly as possible
with
nce.
PHT
serted. This allows the system
out affecting system performa
R1 = 0, ignores any THERM assertions. The Remote 1
oper
rogrammed value.
Bits
ontrol Register 1 (0x36)
enab
ol on the temperature
chan
Dynamic TMIN Control Register 1 (0x36)
Bit [7] R2T = 1, enables dynamic TMIN control on the Remote 2
temperature channel. The chosen TMIN value is dynamically
adjusted based on the current temperature, operating point, and
high and low limits for this zone.
R2T = 0, disables dynamic TMIN control. The TMIN value chosen
is not adjusted and the channel behaves as described in the
Automatic Fan Control Overview section.
Bit [6] LT = 1, enables dynamic TMIN control on the local
temperature channel. The chosen TMIN value is dynamically
adjusted based on the current temperature, operating point, and
high and low limits for this zone.
LT = 0, disables dynamic TMIN control. The TMIN value chosen is
not adjusted and the channel behaves as described in the
Automatic Fan Control Overview section.
Bit [5] R1T = 1, enables dynamic TMIN control on the Remote 1
temperature channel. The chosen TMIN value is dynamically
adjusted based on the current temperature, operating point, and
high and low limits for this zone.
R1T = 0, disables dynamic TMIN control. The TMIN value chosen
is not adjusted, and the channel behaves as described in the
Automatic Fan Control Overview section.
ENHANCING SYSTEM ACOUSTICS
Automatic fan speed control mode reacts instantaneously to
changes in temperature; that is, the PWM duty cycle responds
immediately to temperature change. Any impulses in
temperature can cause an impulse in fan noise. For psycho-
acoustic reasons, the ADT7473 can prevent the PWM output
from reacting instantaneously to temperature changes.
Enhanced acoustic mode controls the maximum change in
PWM duty cycle at a given time. The objective is to prevent the
fan from cycling up and down, annoying the user.
Acoustic Enhancement Mode Overview
Figure 71 gives a top-level overview of the automatic fan control
circuitry on the ADT7473 and shows where acoustic enhance-
ment fits in. Acoustic enhancement is intended as a postdesign
tweak made by a system or mechanical engineer evaluating best
settings for the system. Having determined the optimal settings
for the thermal solution, the engineer can adjust the system
acoustics. The goal is to implement a system that is acoustically
pleasing without causing user annoyance due to fan cycling. It is
important to realize that although a system might pass an
acoustic noise requirement specification (for example, 36 dB), if
the fan is annoying, it fails the consumer test.
ating point register reflects its p
Enabling Dynamic TMIN Control Mode
[7:5] of the Dynamic TMIN C
le/disable dynamic TMIN contr
nels.


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