ADM1034

Rev. 0 | Page 33 of 40

Bit

Name

R/W

Description

Speed

temperature between the two thresholds. Default = 1 = Linear.

1

Boost Disable

R/W

Set bit to 1 to prevent the fans from being boosted if either THERM temperature or THERM timer

limits are exceeded. Under these conditions, the fan runs at the previously calculated speed. Default

= 0.

0

SW Reset

R/W

Set this bit to 1 to reset the ADM1034 registers to their default values, excluding the limit registers,

offset registers, and look-up table registers. This bit self-clears. Default = 0.

Table 38. Register 0x03, Configuration Register 3, Power-On Default= 0x44, Lock = Y, SW Reset = Y

Bit

Name

R/W

Description

<7:4>

#Poles Fan 2

R/W

Write the number of poles on Fan 2 to this register. power-on default = 4 poles = 100. This should

always be an even number, because there cannot be an odd number of poles in a fan.

<3:0>

#Poles Fan 1 1

R/W

Write the number of poles in Fan 1 to this register. power-on default = 4 poles = 100. This should

always be an even number, because there cannot be an odd number of poles in a fan.

Table 39. Register 0x04, Configuration Register 4, Power-On Default = 0x00, Lock = Y, SW Reset = Y

Bit

Name

R/W

Description

7

FAN_FAULT/REF

R/W

This bit sets the function for Pin 8. 0 = Default = FAN_FAULT output (THERM input

is CMOS). 1 = Reference input for THERM.

<6:4>

THERM % Time Window

R/W

These bits set the time window over which THERM % is calculated.

000 = 0.25 second

001 = 0.5 second

010 = 1 second

011 = 2 seconds

100 = 4 seconds

101 = 8 seconds

110 = 8 seconds

111 = 8 seconds

3

XOR Test

R/W

Set this bit to 1 to enable the XOR connectivity test.

2

Enable Remote 2 THERM Events

R/W

This bit enables THERM assertions as an output. Functions when the THERM timer

is enabled and the Remote 2 temperature exceeeds its THERM limit.

1

Enable Remote 1 THERM Events

R/W

This bit enables THERM assertions as an output. Functions when the THERM timer

is enabled and the Remote 1 temperature exceeeds its THERM limit.

0

Enable Local THERM Events

R/W

This bit enables THERM assertions as an output. Functions when the THERM timer

is enabled and the local temperature exceeeds its THERM limit.

Table 40. Register 0x05, Conversion Rate Register, Power-On Default = 0x07, Lock = Y, SW Reset = Y

Bit

Name

R/W

Description

7

Res

R

This bit is reserved for future use. Do not write to this bit.

<6:4>

Res

R

Reserved.

<3:0>

Conversion Rate

R/W

These four bits set the conversion rate of the ADM1034. Changing these bits does not update the

conversion rate until the start of the next round robin.

0000 = 0.0625 conversions/second

0001 = 0.125 conversions/second

0010 = 0.25 conversions/second

0011 = 0.5 conversions/second

0100 = 1 conversion/second

0101 = 2 conversions/second

0110 = 4 conversions/second

0111 = 8 conversions/second = default

1000 = 16 conversions/second

1001 = 32 conversions/second

1010 = 64 conversions/second