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ADT7490
Table 63. REGISTER 0x41 ? INTERRUPT STATUS REGISTER 1 (POWER-ON DEFAULT = 0x00)
Bit No.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Mnemonic
+ 2.5 V IN /
THERM
V CCP
V CC
+5 V IN
R1T
LT
R2T
OOL
R/W
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Description
+2.5 V IN = 1 indicates that the 2.5 V IN 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.
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.
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.
+5 V IN = 1 indicates that the 5 V IN 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.
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 Interrupt Status Register 2
(0x42). 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 64. REGISTER 0x42 ? INTERRUPT STATUS REGISTER 2 (POWER-ON DEFAULT = 0x00)
Bit No.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Mnemonic
+12 V IN
OOL
FAN1
FAN2
FAN3
FAN4/
THERM
D1 FAULT
D2 FAULT
R/W
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Description
+12 V IN = 1 indicates that the 12 V IN 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.
OOL = 1 indicates that an out-of-limit event has been latched in Interrupt Status Register 3
(0x43). This bit is a logical OR of all status bits in Interrupt Status Register 3. Software can
test this bit in isolation to determine whether any of the voltage, temperature, or fan speed
readings represented by Interrupt Status Register 3 are out-of-limit, which eliminates the
need to read Interrupt Status Register 3 during every interrupt or polling cycle.
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.
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.
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.
When Pin 14 is programmed as a TACH4 input, FAN4 = 1 indicates that Fan 4 has dropped
below minimum speed or has stalled. This bit is not s et whe n the PWM3 output is off.
If Pin 14 is configured as the THERM timer input for THERM monitoring, this bit is set when
the THERM assertion time exceeds the limit programmed in the THERM timer limit register
(Register 0x7A).
D1 FAULT = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.
D2 FAULT = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.
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