ADT7476A
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52
Table 58. REGISTER 0x41 INTERRUPT STATUS REGISTER 1 (POWER-ON DEFAULT = 0x00)
Bit No.
Mnemonic
R/W
Description
[0]
2.5 V/
THERM
Read-only
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. If Pin 22 is configured as
THERM
, this bit is asserted when the timer limit has been exceeded.
[1]
V
CCP
Read-only
V
CCP
= 1 indicates that the V
CCP
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.
[2]
V
CC
Read-only
V
CC
= 1 indicates that the V
CC
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.
[3]
5.0 V
Read-only
A 1 indicates that the 5.0 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.
[4]
R1T
Read-only
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.
[5]
LT
Read-only
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.
[6]
R2T
Read-only
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.
[7]
OOL
Read-only
OOL = 1 indicates that an out-of-limit event has been latched in Interrupt Status Register 2.
This bit is a logical OR of all status bits in Interrupt Status Register 2. Software can test this
bit in isolation to determine whether any of the voltage, temperature, or fan speed readings
represented by Interrupt Status Register 2 are out-of-limit, which eliminates the need to read
Interrupt Status Register 2 during every interrupt or polling cycle.
Table 59. REGISTER 0x42 INTERRUPT STATUS REGISTER 2 (POWER-ON DEFAULT = 0x00)
Bit No.
Mnemonic
R/W
Description
[0]
12 V/VC
Read-only
A 1 indicates that the 12 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 21 is configured as VID5,
this bit is the VID change bit. This bit is set when the levels on VID0 to VID5 are different
than they were 11 ms previously. This pin can be used to generate an SMBALERT
whenever
the VID code changes.
[1]
OVT
Read-only
OVT = 1 indicates that one of the THERM
overtemperature limits has been exceeded. This
bit is cleared on a read of the status register when the temperature drops below
THERM
T
HYST
.
[2]
FAN1
Read-only
FAN1 = 1 indicates that Fan 1 has dropped below minimum speed or has stalled. This bit is
not set when the PWM1 output is off.
[3]
FAN2
Read-only
FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is
not set when the PWM2 output is off.
[4]
FAN3
Read-only
FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is
not set when the PWM3 output is off.
[5]
F4P
Read-only
R/W
Read-only
When Pin 14 is programmed as a TACH4 input, F4P = 1 indicates that Fan 4 has dropped
below minimum speed or has stalled. This bit is not set when the PWM3 output is off.
When Pin 14 is programmed as the GPIO6 output, writing to this bit determines the logic
output of GPIO6. When GPIO6 is programmed as an input, this bit reflects the value read by
GPIO6.
If Pin 14 is configured as the THERM
timer input for THERM
monitoring, then this bit is set
when the THERM
assertion time exceeds the limit programmed in the THERM
timer limit
register (0x7A).
[6]
D1
Read-only
D1 = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.
[7]
D2
Read-only
D2 = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.
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