REV. C

–40–

ADT7463

Table XVII. Temperature Limit Registers

Register Address

R/W

Description

Power-On Default

0x4E

Read/Write

Remote 1 Temp Low Limit

0x81

0x4F

Read/Write

Remote 1 Temp High Limit

0x7F

0x50

Read/Write

Local Temp Low Limit

0x81

0x51

Read/Write

Local Temp High Limit

0x7F

0x52

Read/Write

Remote 2 Temp Low Limit

0x81

0x53

Read/Write

Remote 2 Temp High Limit

0x7F

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.

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 XVIII. Fan Tachometer Limit Registers

Register Address

R/W

Description

Power-On Default

0x54

Read/Write

TACH1 Minimum Low Byte

0xFF

0x55

Read/Write

TACH1 Minimum High Byte

0xFF

0x56

Read/Write

TACH2 Minimum Low Byte

0xFF

0x57

Read/Write

TACH2 Minimum High Byte

0xFF

0x58

Read/Write

TACH3 Minimum Low Byte

0xFF

0x59

Read/Write

TACH3 Minimum High Byte

0xFF

0x5A

Read/Write

TACH4 Minimum Low Byte

0xFF

0x5B

Read/Write

TACH4 Minimum High Byte

0xFF

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.

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