ADT7476ARQZ-R7 datasheet(54/67 Pages) ONSEMI

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ADT7476

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Table 27. Temperature Limit Registers (Note 1)

R/W

Description (Note 2)

Power−On Default

0x4E

R/W

Remote 1 temperature low limit.

0x81

0x4F

R/W

Remote 1 temperature high limit.

0x7F

0x50

R/W

Local temperature low limit.

0x81

0x51

R/W

Local temperature high limit.

0x7F

0x52

R/W

Remote 2 temperature low limit.

0x81

0x53

R/W

Remote 2 temperature high limit.

0x7F

1. Exceeding any of these temperature limits by 1°C causes the appropriate status bit to be set in the interrupt status register. Setting the

Configuration Register 1 lock bit has no effect on these registers.

2. High limits: An interrupt is generated when a value exceeds its high limit (> comparison). Low limits: An interrupt is generated when a value

is equal to or below its low limit (≤ comparison).

Table 28. Fan TACH Limit Registers (Note 1)

R/W

Description

Power−On Default

0x54

R/W

TACH1 minimum low byte.

0xFF

0x55

R/W

TACH1 minimum high byte/single−channel ADC channel select.

0xFF

0x56

R/W

TACH2 minimum low byte.

0xFF

0x57

R/W

TACH2 minimum high byte.

0xFF

0x58

R/W

TACH3 minimum low byte.

0xFF

0x59

R/W

TACH3 minimum high byte.

0xFF

0x5A

R/W

TACH4 minimum low byte.

0xFF

0x5B

R/W

TACH4 minimum high byte.

0xFF

1. Exceeding any of the TACH limit registers by 1 indicates that the fan is running too slowly or has stalled. The appropriate status bit is set

in Interrupt Status Register 2 to indicate the fan failure. Setting the Configuration Register 1 lock bit has no effect on these registers.

Table 29. Register 0x55 — TACH1 Minimum High Byte (Power−On Default = 0xFF)

Bit No.

Mnemonic

R/W

Description

[4:0]

Reserved

Read−only

When Bit 6 of Configuration 2 Register (0x73) is set (single−channel ADC mode), these bits

are reserved. Otherwise, these bits represent Bits [4:0] of the TACH1 minimum high byte.

[7:5]

SCADC

R/W

When Bit 6 of Configuration 2 Register (0x73) is set (single−channel ADC mode), these bits

are used to select the only channel from which the ADC will take measurements. Otherwise,

these bits represent Bits [7:5] of the TACH1 minimum high byte.

ADT7476ARQZ-R7 Datasheet(PDF) 54 Page - ON Semiconductor

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