ADT7460ARQZ-RL7 ONSEMI [ON Semiconductor], ADT7460ARQZ-RL7 Datasheet - Page 35

• Manufacturer Part Number: ADT7460ARQZ-RL7
• Description: dBCOOL Remote Thermal Monitor and Fan Controller
• Manufacturer: ONSEMI [ON Semiconductor]

Table 46. Register 0x40 — Configuration Register 1 (Power−On Default = 0x00)
Table 47. Register 0x41 — Interrupt Status Register 1 (Power−On Default = 0x00)
Bit No.
Bit No.
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
Mnemonic
Mnemonic
FSPDIS
TODIS
LOCK
FSPD
STRT
RDY
RES
2.5V
RES
RES
OOL
R1T
R2T
V
V
LT
CC
CC
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Read−only
Once
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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 powerup 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 ADT7460 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 ADT7460 to indicate that the device is fully powered−up and ready to
begin systems monitoring.
When set to 1, all fans run at full speed. Power−on default = 0. (This bit cannot be locked.)
Reserved for future use.
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 set to 1, the SMBus timeout feature is disabled. This allows the ADT7460 to be used
with SMBus controllers that cannot handle SMBus timeouts. (Lockable.)
When set to 1, the ADT7460 rescales its V
When set to 0, the ADT7460 measures V
A 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.
Reserved for future use.
A 1 indicates that the V
the status register only if the error condition has subsided.
Reserved for future use.
A 1 indicates that the Remote 1 low or high temperature limit has been exceeded. This bit is
cleared on a read of the status register only if the error condition has subsided.
A 1 indicates the local low or high temperature limit has been exceeded. This bit is cleared on a
read of the Status Register only if the error condition has subsided.
A 1 indicates that the Remote 2 low or high temperature limit has been exceeded. This bit is
cleared on a read of the status register only if the error condition has subsided.
A 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. This saves the need to read Status Register 2 every
interrupt or polling cycle.
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ADT7460
CC
35
high or low limit has been exceeded. This bit is cleared on a read of
Description
CC
Description
CC
as a 3.3 V supply. (Lockable.)
pin to measure a 5.0 V supply.