ADT7468 Analog Devices, Inc., ADT7468 Datasheet - Page 68

• Manufacturer Part Number: ADT7468
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

ADT7468
Table 26. Register 0x40—Configuration Register 1 (Power-On Default = 0x01)
Bit
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
Table 27. Register 0x41—Interrupt Status Register 1 (Power-On Default = 0x00)
Bit
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
Name
STRT
LOCK
RDY
FSPD
VxI
FSPDIS
TODIS
V
Name
2.5 V
V
V
5 V/
THERM
timer
R1T
LT
R2T
OOL
CC
CCP
CC
R/W
Read/write
Write once
Read-only
Read/write
Read/write
Read/write
Read/write
Read/write
R/W
Read only
Read only
Read only
Read only
Read only
Read only
Read only
Read only
Description
2.5 V = 1 indicates that the 2.5 V high or low limit has been exceeded. This bit is cleared on a read of the
status register only if the error condition has subsided.
V
status register only if the error condition has subsided.
V
status register only if the error condition has subsided.
A one indicates the 5 V high or low limit has been exceeded. This bit is cleared on a read of the status
register only if the error condition has subsided. If Pin 20 is configured as THERM, this bit is asserted when
the timer limit has been exceeded.
R1T = 1 indicates that the Remote 1 low or high temperature has been exceeded. This bit is cleared on a
read of the status register only if the error condition has subsided.
LT =1 indicates that the local low or high temperature has been exceeded. This bit is cleared on a read of
the status register only if the error condition has subsided.
R2T = 1 indicates that the Remote 2 low or high temperature has been exceeded. This bit is cleared on a
read of the status register only if the error condition has subsided.
OOL = 1 indicates that an out-of-limit event has been latched in Status Register 2. This bit is a logical OR
of all status bits in Status Register 2. Software can test this bit in isolation to determine whether any of
the voltage, temperature, or fan speed readings represented by Status Register 2 are out-of-limit, which
saves the need to read Status Register 2 during every interrupt or polling cycle.
Description
Logic 1 enables monitoring and PWM control outputs based on the limit settings programmed.
Logic 0 disables monitoring and PWM control based on the default power-up limit settings.
Note that the limit values programmed are preserved even if a Logic 0 is written to this bit and the
default settings are enabled. This bit becomes read-only and cannot be changed once Bit 1 (LOCK bit)
has been written. All limit registers should be programmed by BIOS before setting this bit to 1.
(Lockable.)
Logic 1 locks all limit values to their current settings. Once this bit is set, all lockable registers become
read-only and cannot be modified until the ADT7468 is powered down and powered up again. This
prevents rogue programs such as viruses from modifying critical system limit settings. (Lockable.)
This bit is set to 1 by the ADT7468 to indicate only that the device is fully powered-up and ready to
begin system monitoring.
When set to 1, this bit runs all fans at full speed. Power-on default = 0. This bit never gets locked.
BIOS should set this bit to a 1 when the ADT7468 is configured to measure current from an ADI ADOPT™
VRM controller and to measure the CPU’s core voltage. This bit allows monitoring software to display
CPU watts usage. (lockable.)
Logic 1 disables fan spin-up for two TACH pulses. Instead, the PWM outputs go high for the entire fan
spin-up timeout selected.
When this bit is set to 1, the SMBus timeout feature is enabled. This allows the ADT7468 to be used with
SMBus controllers that cannot handle SMBus timeouts. (lockable.)
When this bit is set to 1, the ADT7468 rescales its V
ADT7468 measures V
CCP
CC
= 1 indicates that the V
= 1 indicates that the V
CC
as a 3.3 V supply. (lockable.)
CC
Rev. A | Page 68 of 84
CCP
high or low limit has been exceeded. This bit is cleared on a read of the
high or low limit has been exceeded. This bit is cleared on a read of the
CC
pin to measure 5 V supply. If this bit is 0, the