THMC50

REMOTE/LOCAL TEMPERATURE MONITOR AND

FAN CONTROLLER WITH SMBus INTERFACE

SLIS090 – JULY 1999

25

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

register 0x41 interrupt status register

power-on default <7:0> = 00h

BIT

NAME

READ/WRITE

DESCRIPTION

0

Ambient temperature error

Read only

A 1 indicates one of the ambient temperature limits has been exceeded.

1

Reserved

Read only

Undefined (reserved for remote thermal diode 2 temperature error)

2

Reserved

Read only

Undefined (reserved for remote thermal diode 2 fault)

3

Reserved

Read only

Undefined

4

GPI input

Read only

A 1 indicates that the GPI terminal is asserted. The polarity of the GPI terminal is

determined by GPI invert (bit 6) in the configuration register. For example, if GPI invert is

cleared, then this bit is 1 when the GPI terminal is high (1); this bit is 0 when the GPI

terminal is low (0). If GPI invert is set, then this bit is 1 when the GPI terminal is low (0); this

bit is 0 when the GPI terminal is high (1). Note: The state of GPI is not latched; this bit

simply reflects the state or inverted state of the GPI terminal. If this bit is 1, reading this

register does not clear it to 0.

5

Remote temperature error

Read only

A 1 indicates one of the remote thermal diode limits has been exceeded.

6

THERM input

Read only

A 1 indicates that the thermal overload (THERM) line has been asserted externally.

7

Remote diode fault

Read only

A 1 indicates either a short or open circuited fault on the remote thermal diode inputs.

NOTE: An error that causes continuous interrupts to be generated may be masked in its respective mask register, until the error can be alleviated.

register 0x43 interrupt mask register

power-on default <7:0> = 00h

BIT

NAME

READ/WRITE

DESCRIPTION

0

Ambient temperature error

Read/write

A 1 disables the corresponding interrupt status bit for the INT output.

1

Reserved

Read only

Undefined (reserved for remote thermal diode 2 temperature error)

2

Reserved

Read only

Undefined (reserved for remote thermal diode 2 fault)

3

Reserved

Read only

Undefined

4

GPI input

Read/write

A 1 disables the corresponding interrupt status bit for the INT output.

5

Remote temperature error

Read/write

A 1 disables the corresponding interrupt status bit for the INT output.

6

THERM input

Read/write

A 1 disables the corresponding interrupt status bit for the INT output.

7

Remote diode fault

Read/write

A 1 disables the corresponding interrupt status bit for the INT output.