ADT7476EBZEVB【PDF 60/65 页】BOARD EVALUATION FOR ADT7476

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ADT7476

Table 77. REGISTER 0X73 ? CONFIGURATION REGISTER 2 (POWER-ON DEFAULT = 0X00) (Note 1)

Bit No.

[0]

[1]

[2]

[3]

[4]

[5]

[6]

Mnemonic

FanPresDT

Fan1Detect

Fan2Detect

Fan3Detect

AVG

ATTN

CONV

R/W

R/W

Read-only

Read-only

Read-only

R/W

R/W

R/W

Description

When FanPresenceDT = 1, the state of Bits [3:1] of 0x73 reflects the presence of a 4-wire fan

on the appropriate TACH channel.

Fan1Detect = 1 indicates that a 4-wire fan is connected to the TACH1 input.

Fan2Detect = 1 indicates that a 4-wire fan is connected to the TACH2 input.

Fan3Detect = 1 indicates that a 4-wire fan is connected to the TACH3 input.

AVG = 1 indicates that averaging on the temperature and voltage measurements is turned

off. This allows measurements on each channel to be made much faster (x16).

ATTN = 1 indicates that the ADT7476 removes the attenuators from the +2.5 V IN , V CCP ,

+5.0 V IN , and +12 V IN inputs. These inputs can be used for other functions such as connecting

up external sensors. It is also possible to remove attenuators from individual channels using

Bits [7:4] of Configuration Register 4 (0x7D).

CONV = 1 indicates that the ADT7476 is put into a single-channel ADC conversion mode. In

this mode, the ADT7476 can be made to read continuously from one input only, for example,

Remote 1 temperature. The appropriate ADC channel is selected by writing to Bits [7:5] of

TACH1 minimum high byte register (0x55).

Bits [7:5], Register 0x55

000

001

010

011

100

101

110

111

2.5 V

V CCP

V CC (3.3 V)

5.0 V

12 V

Remote 1 Temperature

Local Temperature

Remote 2 Temperature

[7]

Res

This bit is reserved and should not be changed.

1. This register becomes read-only when the Configuration Register 1 Lock bit is set to 1. Any further attempts to write to this register have no effect.

Table 78. REGISTER 0X74 ? INTERRUPT MASK REGISTER 1 (POWER-ON DEFAULT [7:0] = 0X00)

Bit No.

[0]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

Mnemonic

2.5 V/

THERM

V CCP

V CC

5.0 V

R1T

LT

R2T

OOL

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Description

2.5 V/THERM = 1 masks SMBALERT for out-of-limit conditions on the 2.5 V/THERM timer

channel.

V CCP = 1 masks SMBALERT for out-of-limit conditions on the V CCP channel.

V CC = 1 masks SMBALERT for out-of-limit conditions on the V CC channel.

5.0 V = 1 masks SMBALERT for out-of-limit conditions on the 5.0 V channel.

R1T = 1 masks SMBALERT for out-of-limit conditions on the Remote 1 temperature channel.

LT = 1 masks SMBALERT for out-of-limit conditions on the local temperature channel.

R2T = 1 masks SMBALERT for out-of-limit conditions on the Remote 2 temperature channel.

OOL = 0 when one or more alerts are generated in Interrupt Status Register 2, assuming all

the mask bits in the Interrupt Mask Register 2 (0x75) = 1, SMBALERT is still asserted.

OOL = 1 when one or more alerts are generated in Interrupt Status Register 2, assuming all

the mask bits in the Interrupt Mask Register 2 (0x75) = 1, SMBALERT is not asserted.

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