ADT7468 datasheet(67/80 Pages) AD

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ADT7468

Rev. 0 | Page 67 of 80

Table 27. Register 0x42—Interrupt Status Register 2 (Power-On Default = 0x00)

Bit

Name

R/W

Description

<0>

12V/VC

Read-only

A one indicates that the 12 V high or low limit has been exceeded. This bit is cleared on a read of the status

This bit is set when the levels on VID0 to VID5 are different than they were 11 µs previously. This pin can be

used to generate an SMBALERT whenever the VID code changes.

<1>

OVT

Read-only

OVT = 1 indicates that one of the THERM overtemperature limits has been exceeded. This bit is cleared on a

read of the status register when the temperature drops below THERM − THYST.

<2>

FAN1

Read-only

FAN1 = 1 indicates that Fan 1 has dropped below minimum speed or has stalled. This bit is not set when the

PWM 1 output is off.

<3>

FAN2

Read-only

FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is not set when the

PWM 2 output is off.

<4>

FAN3

Read-only

FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is not set when the

PWM 3 output is off.

<5>

F4P

Read-only

When Pin 14 is programmed as a TACH4 input, F4P = 1 indicates that Fan 4 has dropped below minimum

speed or has stalled. This bit is not set when the PWM3 output is off.

Read/write

When Pin 14 is programmed as a GPIO output, writing to this bit determines the logic output of the GPIO.

Read-only

If Pin 14 is configured as the THERM timer input for THERM monitoring, then this bit is set when the THERM

assertion time exceeds the limit programmed in the THERM limit register (Reg. 0x7A).

<6>

Read-only

D1 = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.

<7>

Read-only

D2 = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.

Table 28. Register 43H—VID Register (Power-On Default = 0x00 )

Bit

Name

R/W

Description

<4:0>

VID[4:0]

Read-only

The VID[4:0] inputs from the CPU indicate the expected processor core voltage. On power-up, these bits

reflect the state of the VID pins, even if monitoring is not enabled.

<5>

VID5

Read-only

Reads VID5 from the CPU when Bit 7 = 1. If Bit 7 = 0, then the VID5 bit always reads back 0 (power-on

default).

<6>

THLD

Read/write

Selects the input switching threshold for the VID inputs.

THLD = 0 selects a threshold of 1 V (VOL < 0.8 V, VIH > 1.7 V).

THLD = 1 lowers the switching threshold to 0.6 V (VOL < 0.4 V, VIH > 0.8 V).

<7>

VIDSEL

Read/write

VIDSEL = 0 configures Pin 21 as the 12 V measurement input (default).

Table 29. Voltage Limit Registers1

R/W

Description2

Power-On Default

0x44

Read/write

2.5 V.

0x00

0x45

Read/write

2.5 V.

0xFF

0x46

Read/write

VCCP low limit.

0x00

0x47

Read/write

VCCP high limit.

0xFF

0x48

Read/write

VCC low limit.

0x00

0x49

Read/write

VCC high limit.

0xFF

0x4A

Read/write

5 V low limit.

0x00

0x4B

Read/write

5 V high limit.

0xFF

0x4C

Read/write

12 V low limit.

0x00

0x4D

Read/write

12 V high limit.

0xFF

1 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).

ADT7468 Datasheet(PDF) 67 Page - Analog Devices

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