ADM1033ARQZ 查看數據表（PDF） - ON Semiconductor

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ADM1033ARQZ

Thermal Monitor and Fan Speed (RPM) Controller

ON Semiconductor 

ADM1033

Table 1. Internal Register Descriptions

Register

Description

Configuration

Provides control and configuration of various functions on the device.

Conversion Rate

Determines the number of measurements per second completed by the ADM1033.

Address Pointer

Contains the address that selects one of the other internal registers. When writing to the ADM1033,

the first byte of data is always a register address, written to the address pointer register.

Status

Provides the status of each limit comparison.

Interrupt Mask

Allows the option to mask ALERTs due to particular out−of−limit conditions.

Value and Limit

Stores the results of temperature and fan speed measurements, along with their limit values.

Offset

Allows the local and remote temperature channel readings to be offset by a twos complement value

written to them. These values are automatically added to the temperature values (or subtracted from

them if negative). This allows the systems designer to optimize the system if required, by adding or

subtracting up to 15.875°C from a temperature reading.

THERM Limit and Hysteresis Contains the temperature value at which THERM is asserted and indicates the level of hysteresis.

Look−up Table

Used to program the look−up table for the fan speed−to−temperature profile.

THERM % On−time and

THERM % Limit

Reflects the state of the THERM input and monitors the duration of the assertion time of the signal as

a percentage of a time window. The user can program the length of the time window.

Table 2. Resistor Ratios for Setting LOCATION Bits

Ideal Ratio R2/(R1 + R2) R1 kW R2 W Actual R2/(R1 + R2)

Error %

N/A

0

O/C

1

0

0.8125

18

82

0.82

+0.75

0.6875

22

47

0.6812

−0.63

0.5625

12

15

0.5556

−0.69

0.4375

15

12

0.4444

+0.69

0.3125

47

22

0.3188

+0.63

0.1875

82

18

0.18

−0.75

N/A

O/C

0

0

0

1. ARP denotes ARP−capable mode, FD denotes fixed and discoverable mode.

SMBus Ver

(Note 1)

ARP

ARP

ARP

ARP

FD

FD

FD

FD

SMBus Address

N/A

N/A

N/A

N/A

0x53

0x52

0x51

0x50

UDID LLL

111

110

101

100

N/A

N/A

N/A

N/A

Table 3. UDID Values

Bit No.

Name

<127:120> Device Capabilities

<119:112>

<111:96>

Version/Revision

Vendor ID

<95:80> Device ID

<79:64> Interface

<63:48> Subsystem Vendor ID

<47:32> Subsystem Device ID

<31:0>

Vendor Specific ID

Function

Describes the ADM1033’s capabilities (for instance, that it supports

PEC and uses a random number address device).

UDID version number (Version 1) and silicon revision identification

Analog Devices vendor ID number, as assigned by the SBS

Implementer’s Forum or the PCI SIG.

Device ID.

Identifies the protocol layer interfaces supported by the ADM1033.

This represents SMBus 2.0 as the Interface version..

Subsystem Vendor ID = 0 (subsystem fields are unsupported).

Subsystem Device ID = 0 (subsystem fields are unsupported).

A unique number per device. Contains LOCATION information (LL)

and a 16−bit random number (x). See Table 5 for information on

setting the LLL bits.

Value

11000001

00001010

00010001

11010100

00010000

00110100

00000000

00000100

00000000

00000000

00000000

00000000

00000000

00000LLL

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