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ADT7467
Table 51. REGISTER 0X40 ? CONFIGURATION REGISTER 1 (POWER-ON DEFAULT = 0X01) (Note 1)
Bit
<0>
Name
STRT
R/W
Read/Write
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 a read-only bit 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)
<1>
<2>
<3>
<4>
<5>
<6>
<7>
LOCK
RDY
FSPD
VxI
FSPDIS
TODIS
V CC
Write Once
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Logic 1 locks all limit values to their current settings. Once this bit is set, all lockable registers
become read-only registers and cannot be modified until the ADT7467 is powered down and
powered up again. This prevents rogue programs such as viruses from modifying critical system
limit settings. (Lockable)
This bit is only set to 1 by the ADT7467 to indicate 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 cannot be locked
at any time.
BIOS should set this bit to a 1 when the ADT7467 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 the watts used by the CPU. (Lockable)
Logic 1 disables fan spin-up for two TACH pulses, and 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 disabled. This allows the ADT7467 to be
used with SMBus controllers that cannot handle SMBus timeouts. (Lockable)
When this bit is set to 1, the ADT7467 rescales its V CC pin to measure 5 V supply. If this bit is 0,
the ADT7467 measures V CC as a 3.3 V supply. (Lockable)
1. This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this
register fail.
Table 52. REGISTER 0X41 ? INTERRUPT STATUS REGISTER 1 (POWER-ON DEFAULT = 0X00)
Bit
<1>
<2>
<4>
<5>
<6>
<7>
Name
V CCP
V CC
R1T
LT
R2T
OOL
R/W
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Description
V CCP = 1 indicates that the V CCP high or low limit has been exceeded. This bit is cleared upon a
read of the status register if the error condition has subsided.
V CC = 1 indicates that the V CC high or low limit has been exceeded. This bit is cleared upon a
read of the status register if the error condition has subsided.
R1T = 1 indicates that the Remote 1 low or high temperature has been exceeded. This bit is
cleared upon a read of the status register if the error condition has subsided.
LT = 1 indicates that the local low or high temperature has been exceeded. This bit is cleared
upon a read of the status register if the error condition has subsided.
R2T = 1 indicates that the Remote 2 low or high temperature has been exceeded. This bit is
cleared upon a read of the status register 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 eliminates the need to read Status Register 2 at every interrupt
or in every polling cycle.
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