ADT7468ZEVB【PDF 22/81 页】BOARD EVAL FOR ADT7468

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ADT7468

LIMITS, STATUS REGISTERS, AND INTERRUPTS

LIMIT VALUES

Each measurement channel on the ADT7468 is associated with

high and low limits. These can form the basis of system status

monitoring; a status bit can be set for any out-of-limit condition

and detected by polling the device. Alternatively, SMBALERT

interrupts can be generated to flag a processor or micro-

controller of out-of-limit conditions.

8-Bit Limits

The following is a list of 8-bit limits on the ADT7468.

Voltage Limit Registers

Reg. 0x44, 2.5 V low limit = 0x00 default, Register 0x44 2.5 V

low limit = 0x00 default

Reg. 0x45, 2.5 V high limit = 0xFF default

Reg. 0x46, V CCP low limit = 0x00 default

Reg. 0x47, V CCP high limit = 0xFF default

Reg. 0x48, V CC low limit = 0x00 default

Reg. 0x49, V CC high limit = 0xFF default

Reg. 0x4A, 5 V low limit = 0x00 default

Reg. 0x4B, 5 V high limit = 0xFF default

Reg. 0x4C, 12 V low limit = 0x00 default

Reg. 0x4D, 12 V high limit = 0xFF default

Reg. 0x46, V CCP low limit = 0x00 default

Reg. 0x47, V CCP high limit = 0xFF default

Reg. 0x48, V CC low limit = 0x00 default

Reg. 0x49, V CC high limit = 0xFF default

Temperature Limit Registers

Reg. 0x4E, Remote 1 temperature low limit = 0x01 default

Reg. 0x4F, Remote 1 temperature high limit = 0x7F default

Reg. 0x6A, Remote 1 THERM limit = 0x64 default

Reg. 0x50, local temperature low limit = 0x01 default

Reg. 0x51, local temperature high limit = 0x7F default

Reg. 0x6B, local THERM limit = 0x64 default

Reg. 0x52, Remote 2 temperature low limit = 0x01 default

Reg. 0x53, Remote 2 Temperature high limi t = 0x7F default

Reg. 0x6C, Remote 2 THERM limit = 0x64 default

THERM Limit Register

Reg. 0x7A, THERM limit = 0x00 default

16-Bit Limits

The fan TACH measurements are 16-bit results. The fan TACH

limits are also 16 bits, consisting of a high byte and low byte.

Because slow or stalled fans are normally the only conditions of

interest, only high limits exist for fan TACHs. Because the fan

TACH period is measured, exceeding the limit indicates a slow

or stalled fan.

Fan Limit Registers

Reg. 0x54, TACH1 minimum low byte = 0x00 default

Reg. 0x55, TACH1 minimum high byte = 0x00 default

Reg. 0x56, TACH2 minimum low byte = 0x00 default

Reg. 0x57, TACH2 minimum high byte = 0x00 default

Reg. 0x58, TACH3 minimum low byte = 0x00 default

Reg. 0x59, TACH3 minimum high byte = 0x00 default

Reg. 0x5A, TACH4 minimum low byte = 0x00 default

Reg. 0x5B, TACH4 minimum high byte = 0x00 default

Out-of-Limit Comparisons

Once all limits have been programmed, the ADT7468 can be

enabled for monitoring. The ADT7468 measures all voltage and

temperature measurements in a round-robin format and sets

the appropriate status bit for out-of-limit conditions. TACH

measurements are not part of this round-robin cycle. Compari-

sons are done differently depending on whether the measured

value is compared to a high or low limit.

High limit: > comparison performed

Low limit: ≤ comparison performed

Voltage and temperature channels use a window comparator for

error detecting and therefore have high and low limits. Fan

speed measurements use only a low limit, which is needed only

in manual fan control mode.

Analog Monitoring Cycle Time

The analog monitoring cycle begins when a 1 is written to the

start bit (Bit 0) of Configuration Register 1 (Reg. 0x40). By

default, the ADT7463 powers up with this bit set. The ADC

measures each analog input and as each measurement is

completed, the result is automatically stored in the appropriate

value register. This round-robin monitoring cycle continues

unless disabled by writing a 0 to Bit 0 of Configuration

Register 1.

Since the ADC normally runs freely in this manner, the time

taken to monitor all the analog inputs is usually not of interest,

because the most recently measured value of any input can be

read at any time.

Rev. 3 | Page 22 of 81 | www.onsemi.com

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