ADM1026JSTZ View Datasheet(PDF) - Analog Devices
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ADM1026JSTZ Datasheet PDF : 56 Pages
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ADM1026
Table 18. 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
R
Undefined
Table 19. 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.
Table 20. Register 07h, Configuration Register 3 (Power-On Default 00h)
Bit Name
R/W
Description
0
Enable GPIO16/ THERM = 0 R/W
When this bit is 1, Pin 42 is enabled as a general-purpose I/O pin (GPIO16); otherwise it
is the THERM output.
1
CI Clear = 0
2
VREF Select = 0
5–3 Unused
6
GPIO16 Direction
7
GPIO16 Polarity
R/W
Writing a 1 to this bit clears the CI latch. This bit is cleared by writing a 0 to it.
R/W
When this bit is 0, VREF (Pin 24) outputs 1.82 V, otherwise, it outputs 2.5 V.
R
Undefined, reads back 0.
R/W
When this bit is 0, GPIO16 is configured as an input; otherwise, it is an output.
R/W
When this bit is 0, GPIO16 is active low; otherwise, it is active high.
Table 21. Register 08h, GPIO Configuration Register 1 (Power-On Default 00h)
Bit Name
R/W
Description
0 GPIO0 Direction
R/W
When this bit is 0, GPIO0 is configured as an input; otherwise, it is an output.
1 GPIO0 Polarity
R/W
When this bit is 0, GPIO0 is active low; otherwise it is active high.
2 GPIO1 Direction
R/W
When this bit is 0, GPIO1 is configured as an input; otherwise, it is an output.
3 GPIO1 Polarity
R/W
When this bit is 0, GPIO1 is active low; otherwise it is active high.
4 GPIO2 Direction
R/W
When this bit is 0, GPIO2 is configured as an input; otherwise, it is an output.
5 GPIO2 Polarity
R/W
When this bit is 0, GPIO2 is active low; otherwise, it is active high.
6 GPIO3 Direction
R/W
When this bit is 0, GPIO3 is configured as an input; otherwise, it is an output.
7 GPIO3 Polarity
R/W
When this bit is 0, GPIO3 is active low; otherwise, it is active high.
Table 22. Register 09h, GPIO Configuration Register 2 (Power-On Default 00h)
Bit Name
R/W
Description
0 GPIO4 Direction
R/W
When this bit is 0, GPIO4 is configured as an input; otherwise, it is an output.
1 GPIO4 Polarity
R/W
When this bit is 0, GPIO4 is active low; otherwise, it is active high.
2 GPIO5 Direction
R/W
When this bit is 0, GPIO5 is configured as an input; otherwise, it is an output.
3 GPIO5 Polarity
R/W
When this bit is 0, GPIO5 is active low; otherwise, it is active high.
4 GPIO6 Direction
R/W
When this bit is 0, GPIO6 is configured as an input; otherwise, it is an output.
5 GPIO6 Polarity
R/W
When this bit is 0, GPIO6 is active low; otherwise, it is active high.
6 GPIO7 Direction
R/W
When this bit is 0, GPIO7 is configured as an input; otherwise, it is an output.
7 GPIO7 Polarity
R/W
When this bit is 0, GPIO7 is active low; otherwise, it is active high.
Rev. A | Page 40 of 56
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