ADM1034

Rev. 0 | Page 32 of 40

Address

R/W

Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Lockable?

0x3D/BD

R

Device ID

7

6

5

4

3

2

1

0

0x34

N

0x3E/BE

R

Company ID

7

6

5

4

3

2

1

0

0x41

N

0x3F/BF

R

Revision Register

7

6

5

4

3

2

1

0

0x02

N

0x40/C0

R

Local Temperature

4

3

2

1

0

RES

RES

RES

0x00

N

0x41/C1

R

Local Temperature

12

11

10

9

8

7

6

5

0x00

N

0x42/C2

R

Remote 1 Temperature

4

3

2

1

0

RES

RES

RES

0x00

N

0x43/C3

R

Remote 1 Temperature

12

11

10

9

8

7

6

5

0x00

N

0x44/C4

R

Remote 2 Temperature

4

3

2

1

0

RES

RES

RES

0x00

N

0x45/C5

R

Remote 2 Temperature

12

11

10

9

8

7

6

5

0x00

N

0x4A/CA

R

TACH1 Period

7

6

5

4

3

2

1

0

0xFF

N

0x4B/CB

R

TACH1 Period

15

14

13

12

11

10

9

8

0xFF

N

0x4C/CC

R

TACH2 Period

7

6

5

4

3

2

1

0

0xFF

N

0x4D/CD

R

TACH2 Period

15

14

13

12

11

10

9

8

0xFF

N

0x4E/CE

R

THERM % Ontime

7

6

5

4

3

2

1

0

0x00

N

0x4F/CF

R

Status 1

LH

LL

R1H

R1L

R1D

R2H

R2L

R2D

0x00

N

0x50/D0

R

Status 2

LT

R1T

R2T

% T

TA

TS

RES

RES

0x00

N

0x51/D1

R

Status 3

F1S

FA

F2S

RES

RES

RES

RES

ALERT

0x00

N

Table 35. Register 0x00, # Bytes/Block Read, POR = 0x20, Lock = Y, S/W Reset =Y

Bit

Name

R/W

Description

<7:0>

# Bytes Block Read

R/W

Block reads are # bytes/block read long. The maximum is 32 bytes, the SMBus transaction limit.

Table 36. Register 0x01, Configuration Register 1, Power-On Default 0x01, Lock = Y, SW Reset = Y

Bit

Name

R/W

Description

7

Table/SW Con

R/W

Set this bit to 1 to place the fan speed under the control of the look-up table. When this bit is 0, the

ADM1034 is in software/manual control mode. Default = 0.

6

Lock Bit

R/W

Set this bit to 1 to prevent the user from writing to the ADM1034 registers. 1 = ADM1034 registers

locked. 0 = ADM1034 registers unlocked. Default = 0.

5

SDA Timeout

R/W

1 = SDA timeout enabled. 0 = SDA timeout disabled. Default = 0.

4

SCL Timeout

R/W

1 = SCL timeout enabled. 0 = SDL timeout disabled. Default = 0.

3

ALERT Configuration

R/W

0 = SMBusALERT. Default = 0. 1 = ALERT_COMP mode.

2

Enable THERM Timer

R/W

1 = timer enabled, 0 = timer disabled. This bit enables THERM as an input. Default = 0.

1

Averaging Off

R/W

This bit is used to disable averaging at the slower conversion rates (8 Hz and slower). Averaging is

automatically disabled at the higher (16, 32, and 64 Hz ) conversion rates. Default = averaging on =

0.

0

Monitor/STBY

R/W

Set bit to 1 to enable temperature monitoring. Set bit to 0 to disable it. Power-On Default = 1

Table 37. Register 0x02, Configuration Register 2, Power-On Default 0x84, Lock = Y, SW Reset = Y

Bit

Name

R/W

Description

7

Round Robin

R/W

This bit enables the round-robin mode. Set this bit to 0 to put the ADM1034 in single-channel

mode. The ADC converts on one channel only, which is determined by the channel selector bits.

Default = Round Robin = 1.

6

Reserved

R/W

Reserved.

<5:4>

Channel Selector

R/W

This bit determines the channel on which the ADC converts.

00 = Local Channel Only

01 = Remote 1 Channel Only

10 = Remote 2 Channel Only

11 = Reserved

3

4:8 Look-Up Table

R/W

This bit determines how many table points are used to control each fan.

0 = 4 table points for each fan

1 = all 8 points on one table; this table is used to control both fans

2

Discrete/Linear

R/W

This bit determines whether the fans run at discrete speeds or at speeds that increase with