REV. A

ADM1028

–13–

Table III. ADM1028 Registers

Register Name

Address A7–A0 in Hex

Comments

Value Registers

0x14–0x38

See Table IV

Company ID

0x3E

This location will contain the company identification number. This

register is read only.

Revision

0x3F

This location will contain the revision number of the part in the

lower four bits of the register [3:0]. The upper four bits reflect the

ADM1028 Version Number [7:4]. The first version is 1101. The

next version of ADM1028 would be 1110, etc. For instance, if the

stepping were A0 and this part is an ADM1028, this register would

read 1101 0000. This register is read only.

Configuration Register

0x40

See Table V. Power-on value = 0010 0001.

Interrupt Status Register

0x41

See Table VI. Power-on value = 0000 0000.

Interrupt Mask Register

0x43

See Table VII. Power-on value = 0000 0000.

Manufacturer Test

0x44–0x4A

Test Registers for manufacturer’s use only. Do not write to these

registers.

Remote Function

0x4B

See Table VIII. Power-on value = 0000 0000.

Alert Status

0x4C

See Table IX. Power-on value = 0000 0000.

Fan Speed Ramp Register

0xCO

See Table X. Power-on value = 0000 0000.

Table IV. Registers 0x13–0x3A Value Registers

Address

Read/Write

Description

0x13

Read/Write

Programmable Internal Therm Automatic Trip Point—Default 127

°C. This register can only be

written to if the write once bit in the Configuration Register (0x40, Bit 3) has not been set.

0x14

Read/Write

Programmable Remote Thermal Diode Automatic Trip Point—Default 100

°C. This register

can only be written to if the write once bit in the Configuration Register (0x40, Bit 3) has

not been set.

0x15

Read/Write

Test register for manufacturer’s use only. Do not write to this register.

0x17

Read Only

Default Internal Therm Automatic Trip Point—Default 70

°C. Cannot be changed. Disabled

when Bit 3 of Configuration Register is set.

0x18

Read Only

Default Remote Thermal Diode Automatic Trip Point—Default 100

°C. Cannot be changed.

Disabled when Bit 3 of Configuration Register is set.

0x19

Read/Write

Analog Output, FAN_SPD (Defaults to 0x00h).

0x26

Read Only

External/Remote Temperature Value.

0x27

Read Only

Internal Temperature Value.

0x37

Read/Write

External/Remote Temperature High Limit—Default +127

°C.

0x38

Read/Write

External/Remote Temperature Low Limit—Default –128

°C.

0x39

Read/Write

Internal Temperature High Limit—Default +127

°C.

0x3A

Read/Write

Internal Temperature Low Limit—Default –128

°C.