EVAL-ADM1026EB datasheet(39/56 Pages) AD

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ADM1026

Rev. A | Page 39 of 56

Table 14. Register 01h, Configuration Register 2 (Power-On Default 00h)

Bit

Name

R/W

Description

Enable GPIO0/Fan0 = 0

R/W

When this bit is 1, Pin 3 is enabled as a general-purpose I/O pin (GPIO0), otherwise it is a fan tach

measurement input (Fan 0).

Enable GPIO1/Fan1 = 0

R/W

When this bit is 1, Pin 4 is enabled as a general-purpose I/O pin (GPIO1), otherwise it is a fan tach

measurement input (Fan 1).

Enable GPIO2/Fan2 = 0

R/W

When this bit is 1, Pin 5 is enabled as a general-purpose I/O pin (GPIO2), otherwise it is a fan tach

measurement input (Fan 2).

Enable GPIO3/Fan3 = 0

R/W

When this bit is 1, Pin 6 is enabled as a general-purpose I/O pin (GPIO3), otherwise it is a fan tach

measurement input (Fan 3).

Enable GPIO4/Fan4 = 0

R/W

When this bit is 1, Pin 9 is enabled as a general-purpose I/O pin (GPIO4), otherwise it is a fan tach

measurement input (Fan 4).

Enable GPIO5/Fan5 = 0

R/W

When this bit is 1, Pin 10 is enabled as a general-purpose I/O pin (GPIO5), otherwise it is a fan tach

measurement input (Fan 5).

Enable GPIO6/Fan6 = 0

R/W

When this bit is 1, Pin 11 is enabled as a general-purpose I/O pin (GPIO6), otherwise it is a fan tach

measurement input (Fan 6).

Enable GPIO7/Fan7 = 0

R/W

When this bit is 1, Pin 12 is enabled as a general-purpose I/O pin (GPIO7), otherwise it is a fan tach

measurement input (Fan 7).

Table 15. Register 02h, Fans 0 to 3 Fan Divisor Register (Power-On Default 55h)

Bit

Name

R/W

Description

1–0

Fan 0 Divisor

R/W

Sets the oscillator prescaler division ratio for Fan 0 speed measurement. The division ratios, oscillator

frequencies, and typical fan speeds (based on 2 tach pulses per revolution) are as follows:

Code

Divide By

Oscillator

Frequency (kHz)

Fan Speed (RPM)

22.5

8800, nominal, for count of 153

11.25

4400, nominal, for count of 153

5.62

2200, nominal, for count of 153

2.81

1100, nominal, for count of 153

3–2

Fan 1 Divisor

R/W

Same as Fan 0

5–4

Fan 2 Divisor

R/W

Same as Fan 0

7–6

Fan 3 Divisor

R/W

Same as Fan 0

Table 16. Register 03h, Fans 4 to 7 Fan Divisor Register (Power-On Default 55h)

Bit

Name

R/W

Description

1–0

Fan 4 Divisor

R/W

Sets the oscillator prescaler division ratio for Fan 4 speed measurement. The division ratios, oscillator

frequencies, and typical fan speeds (based on 2 tach pulses per revolution) are as follows:

Code

Divide By

Oscillator

Frequency (kHz)

Fan Speed (RPM)

22.5

8800, nominal, for count of 153

11.25

4400, nominal, for count of 153

5.62

2200, nominal, for count of 153

2.81

1100, nominal, for count of 153

3-2

Fan 5 Divisor

R/W

Same as Fan 4

5-4

Fan 6 Divisor

R/W

Same as Fan 4

7-6

Fan 7 Divisor

R/W

Same as Fan 4

Table 17. Register 04h, DAC Control Register (Power-On Default FFh)

Bit

Name

R/W

Description

7–0

DAC Control

R/W

This register contains the value to which the fan speed DAC is programmed in normal mode, or the

4 MSBs contain the minimum fan speed in auto fan speed control mode.

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