ADM1026
REGISTERS
Table 11. Address Pointer Register
R/W
Bit
Name
Description
7–0
Address Pointer
Write
Address of ADM±026 registers. See the following tables for details.
Table 12. List of Registers
Hex
Address
Name
Power-On Value Description
00
0±
02
03
04
Configuration ±
Configuration 2
Fan 0–3 Divisor
Fan 4–7 Divisor
DAC Control
00h
00h
55h
55h
FFh
Configures various operating parameters
Configures Pins 3–6 and 9–±2 as fan inputs or GPIO
Sets oscillator frequency for Fan 0–3 speed measurement
Sets oscillator frequency for Fan 4–7 speed measurement
Contains value for fan speed DAC (analog fan speed control) or minimum
value for automatic fan speed control
05
PWM Control
FFh
Contains value for PWM fan speed control or minimum value for automatic
fan speed control
06
07
08
09
0A
EEPROM Register
Configuration Register
GPIO Config ±
GPIO Config 2
GPIO Config 3
±00h
300h
00h
00h
00h
For factory use only
Configuration register for THERM, VREF and GPIO±6
Configures GPIO0 to GPIO3 as input or output and as active high or active low
Configures GPIO4 to GPIO7 as input or output and as active high or active low
Configures GPIO8 to GPIO±± as input or output and as active high or active
low
0B
GPIO Config 4
00h
Configures GPIO±2 to GPIO±5 as input or output and as active high or active
low
0C
0D
EEPROM Register 2
Int Temp THERM Limit
00h
37h (55°C)
For factory use only
High limit for THERM interrupt output based on internal temperature
measurement
0E
0F
±0
±±
±2
TDM± THERM Limit
TDM2 THERM Limit
Int Temp TMIN
TDM± TMIN
50h (80°C)
50h (80°C)
28h (40°C)
40h (64°C)
40h (64°C)
High limit for THERM interrupt output based on Remote Channel ± (D±)
temperature measurement
High limit for THERM interrupt output based on Remote Channel 2 (D2)
temperature measurement
TMIN value for automatic fan speed control based on internal temperature
measurement
TMIN value for automatic fan speed control based on Remote Channel ± (D±)
temperature measurement
TDM2 TMIN
TMIN value for automatic fan speed control based on Remote Channel 2 (D2)
temperature measurement
±3
±4
±5
±6
±7
±8
±9
±A
±B
±C
±D
±E
±F
20
2±
22
23
EEPROM Register 3
Test Register ±
Test Register 2
Manufacturer’s ID
Revision
Mask Register ±
Mask Register 2
Mask Register 3
Mask Register 4
Mask Register 5
Mask Register 6
Int Temp Offset
Int Temp Value
Status Register ±
Status Register 2
Status Register 3
Status Register 4
00h
00h
00h
4±h
4xh
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
Configures EEPROM for read/write/erase, etc.
Manufacturer’s test register
For manufacturer’s use only
Contains manufacturer’s ID code
Contains code for major and minor revisions
Interrupt mask register for temperature and supply voltage faults
Interrupt mask register for analog input faults
Interrupt mask register for fan faults
Interrupt mask register for local temp, VBAT, AIN8, THERM, AFC, CI and GPIO±6
Interrupt mask register for GPIO0 to GPIO7
Interrupt mask register for GPIO8 to GPIO±5
Offset register for internal temperature measurement
Measured temperature from on–chip sensor
Interrupt status register for external temp and supply voltage faults
Interrupt status register for analog input faults
Interrupt status register for fan faults
Interrupt status register for local temp, VBAT, AIN8, THERM, AFC, CI, and GPIO±6
Rev. A | Page 36 of 56
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