ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 57

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

Figure 78 shows the behavior of the PWM output as tempera-
ture v
up. Small drops in
functi
than the previous
the P
varia
prog
Slower Ramp
The ADT7473 ca
by slo
factor
PWM1 Configu ation Register (0x5C)
Bit [3] SLOW, 1 sl
PWM
Bit [3] SLOW, 1 sl
PWM
Bit [3] SLOW, 1 sl
ramm
tions.
WM
aries
90
80
70
60
50
40
30
20
10
wing t
on b
2 Co
3 Co
0
of 4.
Figure
. As th temperature in
outpu o be made less
ecaus he newly calcul
ed in
nfigu ation Register (
nfigu ation Regis
This
he r
Ra
to
78
am
e t
is dep
t t
e
r
r
r
n be programm
ows the ramp
o
ows the ram
PWM
. How Fa
the enhanced aco
tes
temp
p rates.
ws the ram
in Enhanced A
endent on t
erature do not affect the ramp-up
value. Enhanced acoustics mode allows
n Reacts to T
Each ram
p rate for PWM2 by 4.
p rate for PWM3 by 4.
ter (0
R
rate for PWM1 by 4.
coust
ed for much longer ramp times
TEM
cre es, the fan speed mps
sen ive to t
he r mp rate selected and
ate
0
u tics regi
P
empera
p rate
as
d fan s ed
x5D)
x5E)
sit
ics Mo
PWM DUTY CYCLE (%)
s
(°C)
a
de
ture
can
pe
em
sters.
Variatio
be sl
is still higher
peratu
owe
n
d by a
ra
re
Rev. A | Page 57 of 76
The followin
bit is set for each PWM output.
Enhance Acoustics Register 1 (0x62)
Bi
Enhance Acoustics Register 2 (0x63)
Bits [2:0] ACOU3, select the ramp rate for PWM3.
B
its [6:4]
ts [2:0] A O
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 s
101 = 12 sec
110 = 6.4 sec
1
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 s c
100
101 = 12 sec
110
111 = 3.2 sec
000 = 140 sec
001
010 = 47.2 sec
011
100 = 17.6 sec
101
110
11
11 = 3
1 = 3
= 1
= 6
= 7
= 2
= 1
= 6.4 sec
AC
C U, select the ramp te for PWM1.
.2 se
7.6 se
.4 sec
0.4 sec
8 sec
2 sec
.2 sec
g sect
OU2, s
e
c
ec
c
ions
ele
ct the
list th
e ra
ram
mp-u
p rat
ra
e for PWM2.
p times
when th
ADT7473
e SLOW