ADM1024

–25–

REV. 0

Table IX. Register 40h, Configuration Register 1 (Power-On Default = 08h)

Bit

Name

R/

W

Description

0

START

R/

W

Logic 1 enables start-up of ADM1024, logic 0 places it in standby mode. Caution: The outputs of

the interrupt pins will not be cleared if the user writes a zero to this location after an interrupt has

occurred (see “

INT Clear” bit). At start-up, limit checking functions and scanning begins. Note, all

high and low limits should be set into the ADM1024 prior to turning on this bit. (Power-Up Default = 0)

1

INT_Enable

R/

W

Logic 1 enables the

INT_output. 1 = Enabled 0 = Disabled (Power-Up Default = 0).

2

THERM

R/

W

0 =

THERM disabled.

Enable

1 =

THERM enabled.

3

INT_Clear

R/

W

During Interrupt Service Routine (ISR) this bit is asserted Logic 1 to clear INT output without

affecting the contents of the Interrupt Status Register. The device will stop monitoring. It will resume

upon clearing of this bit. (Power-Up Default = 0)

4

RESET

R/

W

Setting this bit generates a low-going 45 ms reset pulse at Pin 12. This bit is self-clearing and power-

up default is 0.

5

Reserved

R/

W

Default = 0.

6

THERM CLR R/W

A one clears the

THERM output without changing the Status Register contents.

7

Initialization

R/

W

Logic 1 restores Power-Up default values to the Configuration register, Interrupt status registers,

Interrupt Mask Registers, Fan Divisor Register, and the Temperature Configuration Register. This bit

automatically clears itself since the power-on default is zero.

Table X. Register 41h, Interrupt Status Register 1 (Power-On Default = 00h)

Bit

Name

R/

W

Description

0

2.5 V/External Temp2 Error

Read Only

A one indicates that a High or Low limit has been exceeded.

Read Only

A one indicates that a High or Low limit has been exceeded.

Read Only

A one indicates that a High or Low limit has been exceeded.

3

5 V Error

Read Only

A one indicates that a High or Low limit has been exceeded.

4

Internal Temp Error

Read Only

A one indicates that a temperature interrupt has been set, or that a High or

Low limit has been exceeded.

5

External Temp1 Error

Read Only

A one indicates that a temperature interrupt has been set, or that a High or

Low limit has been exceeded.

6

FAN1/AIN1 Error

Read Only

A one indicates that a High or Low limit has been exceeded.

7

FAN2/AIN2 Error

Read Only

A one indicates that a High or Low limit has been exceeded.

Table XI. Register 42h, Interrupt Status Register 2 (Power-On Default = 00h)

Bit

Name

R/

W

Description

0

12 V Error

Read Only

A one indicates a High or Low limit has been exceeded.

Read Only

A one indicates a High or Low limit has been exceeded.

2

Reserved

Read Only

Undefined.

3

Reserved

Read Only

Undefined.

4

Chassis Error

Read Only

A one indicates Chassis Intrusion has gone high.

5

THERM Interrupt

Read Only

Indicates that

THERM pin has been pulled low by an external source.

6

D1 Fault

Read Only

Short or open-circuit sensor diode D1.

7

D2 Fault

Read Only

Short or open-circuit sensor diode D2.

NOTES

1. Any time the STATUS Register is read out, the conditions (i.e., Register) that are read are automatically reset. In the case of the channel priority indication, if two

or more channels were out of limits, then another indication would automatically be generated if it was not handled during the ISR.

2. In the Mask Register, the errant voltage interrupt may be disabled, until the operator has time to clear the errant condition or set the limit higher/lower.