ADM1026JSTZ-R7 datasheet(38/55 Pages) ONSEMI

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ADM1026

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Table 16. 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

11.25

5.62

2.81

8800, nominal, for count of 153

4400, nominal, for count of 153

2200, nominal, for count of 153

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 17. 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

11.25

5.62

2.81

8800, nominal, for count of 153

4400, nominal, for count of 153

2200, nominal, for count of 153

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 18. REGISTER 04H, DAC CONFIGURATION 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.

Table 19. REGISTER 05H, PWM CONTROL REGISTER (POWER-ON DEFAULT FFH)

Bit

Name

R/W

Description

7–4

PWM Control

R/W

This register contains the value to which the PWM fan speed is programmed in

normal mode, or the 4 MSBs contain the minimum fan speed in auto fan speed

control mode.

0000 = 0% Duty Cycle

0001 = 7% Duty Cycle

0101 = 33% Duty Cycle

0110 = 40% Duty Cycle

0111 = 47% Duty Cycle

1110 = 93% Duty Cycle

1111 = 100% Duty Cycle

3–0

Unused

Undefined

Table 20. REGISTER 06H, EEPROM REGISTER 1 (POWER-ON DEFAULT 00H)

Bit

Name

R/W

Description

7–0

Factory Use

R/W

For factory use only. Do not write to this register.

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