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Functional Description (Continued)
12.4 Interrupt Status Register 1—Address 01h
Power on default
<
7:0
>
= 0000 0000 binary
Bit Name Read/Write Description
0 IN0 Read Only A one indicates a High or Low limit has been exceeded.
1 IN1 Read Only A one indicates a High or Low limit has been exceeded.
2 IN2 Read Only A one indicates a High or Low limit has been exceeded.
3 IN3 Read Only A one indicates a High or Low limit has been exceeded.
4 IN4 Read Only A one indicates a High or Low limit has been exceeded.
5 IN5 Read Only A one indicates a High or Low limit has been exceeded.
6 IN6 Read Only A one indicates a High or Low limit has been exceeded.
7 INT_IN
Read Only A one indicates that a Low has been detected on the INT_IN.
12.5 Interrupt Status Register 2—Address 02h
Power on default
<
7:0
>
= 0000 0000 binary
Bit Name Read/Write Description
0 Hot Temperature Read Only A one indicates a High or Low limit has been exceeded. Only “One-Time Interrupt”
and “Default Interrupt” modes are supported. The mode is set by bit-6 of the
Interrupt Mask Register 2.
1 BTI
Read Only A one indicates that an interrupt has occurred from the Board Temperature
Interrupt (BTI) input pin. BTI can be tied to the OS output of multiple LM75 chips.
2 FAN1 Read Only A one indicates that a fan count limit has been exceeded.
3 FAN2 Read Only A one indicates that a fan count limit has been exceeded.
4 CI (Chassis
Intrusion)
Read Only A one indicates CI (Chassis Intrusion) has gone high.
5 OS bit
Read Only A one indicates a High or a Low OS Temperature limit has been exceed. Only
“One-Time Interrupt” and “Default Interrupt” modes are supported (see Sections
7.2 and 8.2). The mode is set by bit-7 of the Interrupt Mask Register 2.
6 Reserved Read Only
7 Reserved Read Only
12.6 Interrupt Mask Register 1—Address 03h
Power on default
<
7:0
>
= 0000 0000 binary
Bit Name Read/
Write
Description
0 IN0 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
1 IN1 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
2 IN2 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
3 IN3 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
4 IN4 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
5 IN5 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
6 IN6 Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
7 INT_IN Read/Write A one disables the corresponding interrupt status bit for INT interrupt.
LM80
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