ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 32

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

ADT7473
If V
up), a fail-safe timer begins to count down. If the ADT7473 is
not addressed by any valid SMBus transactions before the fail-
safe timeout (4.6 seconds) lapses, the ADT7473 drives the fans
to full speed. If the ADT7473 is addressed
transaction after this point, the fans stop, and the ADT7473
assumes its default settings and begins normal operation.
If V
up), then a fail-safe timer begins to count down. If the
ADT7473 is addressed by a valid SMBus transaction before the
fail-safe timeout (4.6 seconds) lapses, then the ADT7473
operates normally, assuming the functio
registers. See the flow chart in Figure 43.
CC
CCP
goes high (the system processor power rail is powered
goes high (the system processor power rail is powered
nality of all the default
by a valid SMBus
Rev. A | Page 32 of 76
Y
Y
AFTER THE FAIL-SAFE TIMEOUT
FAIL-SAFE TIMER ELAPSES
ADT7473 IS POWERED UP
START FAIL-SAFE TIMER
HAS THE ADT7473 BEEN
HAS THE ADT7473 BEEN
HAS THE ADT7473 BEEN
SMBus TRANSACTION?
SMBus TRANSACTION?
SMBus TRANSACTION?
ACCESSED BY A VALID
ACCESSED BY A VALID
ACCESSED BY A VALID
IS V
ADT7473 NORMALLY
CCP
START UP THE
ABOVE 0.75V?
N
N
Figure 43. Power-On Flow Chart
Y
Y
N
N
HAS THE ADT7473 BEEN
ACCESSED BY A VALID
SMBus TRANSACTION?
SWITCH OFF FANS
RUNS THE FANS
TO FULL SPEED
CHECK V
Y
CCP
N