ADT7460 Analog Devices, Inc., ADT7460 Datasheet - Page 33

• Manufacturer Part Number: ADT7460
• Description: Dbcool? Remote Thermal Controller And Fan Controller
• Manufacturer: Analog Devices, Inc.

Table 40. PWM Duty Cycle Registers
Register
0x30
0x31
0x32
By readin he
keep
when
or in
OPERATING FROM 3.3 V STANDBY
The
3.3 V
the co
using t
the p
the d
Likew
be d
Figure 5
isable
ADT 60
roce
ynamics o
track of th
aco
STBY sup
the fans a
re v
ise
he
, when monitoring THERM , the HERM
ust
3. C
ssor ould change
g t
74
oltag of the proces
dyn
d du ing these states.
ic e
ontr
am
w
r
e
PWMx current duty
nhancement m
has been specifically d
f the system under dyna
ol PWM Duty Cycle
e current duty c
re running in automa
ply. In computers tha
Description
PWM1 duty cycle
PWM2 duty cycle
PWM3 duty cycle
ic TMIN mo
VARY PWM D UTY
CYCLE WITH 8-BIT
RESOLUTION
the CPU tem
sor is lower
de, lowerin he cor
ode.
ycle on ea
Manually w
cycle gisters, users c
t sup rt S3
tic f
esig
mic TMIN contro
ed
g t
an
ned
ch
ith
per
re
T
po
in the states
speed
a Reso
PWM output ven
atur
to o
Def
0xFF (100%)
0xFF (100%)
0xFF (100%)
e a
se
e v
lut
pera
ault
and
co
timer s uld
nd cha e
ion of 0
oltage f
ntrol ode
te fr
S5 s es,
. If
l.
, e
tat
an
om
ho
m
.39
ng
o
Rev. C | Page 33 of 52
%
a
XNOR TREE TEST MODE
The ADT7460 includes an XNOR tree test mode. This mode is
useful for in-circuit test equipment at board-level testing. By
applying stimulus to the pins included in the XNOR tree, it is
p
F ure 54 shows t
t
T
XNOR t
POWER-ON DEFAULT
The ADT7460 does not monitor temperatu
d
i
( t 0, A ress 0x40) to 1. The
u
c
default.
est
s enab d by s ing t
Bi
onf
ossib to de
ig
efaul n po
p. This is
he
mod
XN
igur
t o
le
le
OR
ree
dd
atio
e.
becaus the BHVR b
test enable register (Reg. 0x6F)
tree t t is invoked
n reg ers are set t
wer
tec
ett
t open
-up. M
es
he s
ist
e
TACH1
TACH2
TACH3
TACH4
PWM2
PWM3
ignals tha
Figure 54. X
he start bi
s or shor
onitorin
t ar
fan
o 1
by set
NOR Tr
t in c
ts on t
its
g of t
PWM1/XTO
00 (fans r
e exercis
s run at f
(Bits <7
onfigu
ting B
emper
ee Test
he sy
:5>) in
.
ed in
stem bo
it 0 (X
ratio
ull sp
re an
ature
un fu
n Regist r 1
d fan speed by
the XN R tree
eed on ower-
ll speed) by
and fa
EN) o he
the PWMx
ard.
ADT7460
f t
n spe
O
p
e
ed