REV. A

ADM1025/ADM1025A

–14–

Table VII. Register 40H – Configuration Register

Bit Name

R/

W

Description

0

START

Read/Write Logic 1 enables start-up of

monitor ASIC, Logic 0 places

the ASIC in standby mode. At

start-up, limit checking func-

tions and scanning begins. Note,

all HIGH and LOW LIMITS

should be set into the ADM1025/

ADM1025A prior to turning on

this bit. (Power-up Default = 0)

1

Reserved

Read

2

Reserved

Read

3

Reserved

Read

4

RESET

Read/Write Setting this bit generates a

minimum 20 ms low pulse on

Pin 16, if the function is

enabled.

5

+12/VID4

Read/Write Selects whether Pin 11 acts

Select

as a 12 V Analog Input monitor-

ing pin, or as a VID[4] input.

This pin defaults to the 12 V

Analog Input. (Default = 0)

6

Reserved

Read

7

Initialization Read/Write Logic 1 restores power-up

default values to the Configu-

ration Register and Status

Registers. This bit automati-

cally clears itself and the power-

on default is zero.

Table VIII. Register 41H – STATUS Register 1 (Power-On

Default <7:0> = 00h)

Bit

Name

R/

W

Description

0

+2.5 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

+3.3 V_Error

Read Only

A one indicates a High

or Low limit has been

exceeded.

3

+5 V_Error

Read Only

A one indicates a High

or Low limit has been

exceeded.

4

Local Temp

Read Only

A one indicates that a

Error

High or a Low Tem-

perature limit has been

exceeded.

5

Remote Temp

Read Only

A one indicates a High

Error

or Low Remote Tem-

perature Limit has been

exceeded.

6

Reserved

7

Reserved

Table IX. Register 42H – Status Register 2 (Power-On Default

<7:0> = 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

Reserved

Read Only

Undefined

5

Reserved

Read Only

Undefined

6

Remote Diode

Read Only

A one indicates either a

Fault

short or open circuited

fault on the remote ther-

mal diode inputs.

7

Reserved

Read Only

Undefined

Table X. Register 47h – VID REGISTER (Power-On Default

= 0000 (VID[3:0]))

Bit Name

R/

W

Description

0–3 VID[3:0]

Read Only

The VID[3:0] inputs from

Pentium/PRO power supplies

to indicate the operating

voltage (e.g., 1.3 V to 2.9 V).

4–5 Reserved

Read Only

Undefined

6

Offset Config

Read/Write Configures offset register to

be used with internal or

external channel. If Bit 0 of

Test Register = 1, and Bit 7

of VID Register = 0, then

setting this bit to 1 config-

ures the Offset Register to the

internal temperature chan-

nel. Clearing this bit config-

ures the Offset Register to the

external temperature chan-

nel. (Default = 0)

7

RST ENABLE Read/Write When set to 1, enables the

RST output function on Pin

16. This bit defaults to 0 on

power-up. (

RST Disabled.)

Table XI. Register 49h – VID4 Register (Power-On Default =

1000 000(VID4))

Bit

Name

R/

W

Description

0

VID4

Read

VID4 Input (If Selected)

(Defaults to 0)

1–7

Reserved

Read