REV. 0

ADM1022

–17–

Table VI. Register 0x40 Configuration Register

Bit

Name

Read/Write

Description

0

START

Read/Write

Setting this bit to a “1” enables startup of ADM1022; clearing this bit to a “0” places

ADM1022 in standby mode. Caution: The

INT output will not be cleared if the user

clears this bit after an interrupt has occurred (see “

INT Clear” bit). At startup tempera-

ture monitoring and limit checking functions begin. Note, all limit values should be pro-

grammed into ADM1022 prior to using the standard thermal interrupt mechanism based

upon high and low limits. (Power-Up Default = 1.)

1

INT Enable

Read/Write

Setting this bit to a “1” enables the

INT output. 1 = Enabled 0 = Disabled

(Power-Up Default = 0).

2

INT Clear

Read/Write

This bit clears the

INT output when set (1) without affecting the contents of the Interrupt

Status Register. (Power-Up Default = 1.)

3

Programmable

Read/Write

Setting this bit to a “1” will lock in the value set into the Programmable Local and Remote

Automatic Trip

Once

Automatic Trip Point Registers (Value Register locations 0x13 and 0x14). Furthermore,

Point Lock Bit

when this bit is set, the values in the Default Local and Remote Automatic Trip Point

Registers (Value Register locations 0x17 and 0x18) will no longer have an effect on the

THERM, FAN_SPD or FAN-OFF outputs. This bit cannot be written again until after

RST2 has been asserted or Power-On Reset occurs. (Power-Up Default = 0.)

4

Soft Reset

Read/Write

Setting this bit to a “1” will restore power-up default values to the Configuration Regis-

ter, Interrupt Status Register, Interrupt Status Register Mirror, Interrupt Mask Register.

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

5

FAN OFF

Read/Write

Setting this bit to a “1” will cause the

FAN OFF pin to be floated. Clearing this bit to “0”

will cause the

FAN OFF pin to be driven low, which requests that the fan be turned off.

This bit will be unconditionally set if the

THERM pin is ever asserted. Reading this bit

reflects the state of the

FAN-OFF output buffer. Due to the open-drain nature of this pin

the value read does not represent the actual state of the external circuit connected to it.

(Power-Up Default = 1.)

6

GPI Invert

Read/Write

Setting this bit to a “1” will invert the GPI input for the purpose of level detection and

interrupt generation. Clearing this bit to a “0” leaves the GPI input unmodified. (Power-

Up Default = 0.)

7

D2

Read/Write

Setting this bit configures Pins 11 and 12 as inputs for a second diode temperature sen-

sor. Clearing this bit configures Pin 11 as

THERM output and Pin 12 as general purpose

logic input (GPI). (Power-Up Default = 0.)

Table VII. Register 0x41 Interrupt Status Register. Power-On Default <7:0> = 00h

Bit

Name

Read/Write

Description

0

Int. Temp Error

Read Only

A one indicates that one of the internal temperature sensor limits has been exceeded.

1

Ext. Temp2 Error

Read Only

A one indicates that one of the limits for the second external temperature sensor has

been exceeded.

2

Diode 2 Fault

Read Only

A one indicates either a short- or open-circuit fault on remote sensor diode 2.

3

Reserved

Read Only

Undefined.

4

GPI Input

Read Only

A “1” indicates that the GPI pin is asserted. The polarity of the GPI pin is determined

by GPI Invert (Bit 6) in the Configuration Register. For example, if GPI Invert is cleared,

this bit will be “1” when the GPI pin is high (“1”); this bit will be “0” when the GPI

pin is low (“0”). If GPI Invert is set, this bit will be “1” when the GPI pin is low (“0”);

this bit will be “0” when the GPI pin is high (“1”). Note that the state of GPI is not

latched; this bit simply reflects the state or inverted state of the GPI pin. Note: if this

bit is “1” reading this register will NOT clear it to “0.”

5

Ext. Temp1 Error

Read Only

A one indicates that one of the limits for the first external temperature sensor has been

exceeded.

6

THERM Input

Read Only

A one indicates that the thermal overload (

THERM) line has been asserted externally.

7

Diode 1 Fault

Read Only

A one indicates either a short- or open-circuit fault on remote sensor diode 1.

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