ADM1026JSTZ View Datasheet(PDF) - Analog Devices
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ADM1026JSTZ Datasheet PDF : 56 Pages
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ADM1026
Table 14. Register 01h, Configuration Register 2 (Power-On Default 00h)
Bit Name
R/W Description
0 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).
1 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).
2 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).
3 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).
4 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).
5 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).
6 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).
7 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)
00
1
22.5
8800, nominal, for count of 153
01
2
11.25
4400, nominal, for count of 153
10
4
5.62
2200, nominal, for count of 153
11
8
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)
00
1
22.5
8800, nominal, for count of 153
01
2
11.25
4400, nominal, for count of 153
10
4
5.62
2200, nominal, for count of 153
11
8
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.
Rev. A | Page 39 of 56
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