ADT7463ARQZ-R7 datasheet(19/52 Pages) ONSEMI

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REV. C

ADT7463

–19–

LIMITS, STATUS REGISTERS, AND INTERRUPTS

Limit Values

Associated with each measurement channel on the ADT7463

are 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

microcontroller of out-of-limit conditions.

8-Bit Limits

The following is a list of 8-bit limits on the ADT7463.

Voltage Limit Registers

Reg. 0x44 2.5 V Low Limit = 0x00 Default

Reg. 0x45 2.5 V High Limit = 0xFF Default

Reg. 0x46 VCCP Low Limit = 0x00 Default

Reg. 0x47 VCCP High Limit = 0xFF Default

Reg. 0x48 VCC Low Limit = 0x00 Default

Reg. 0x49 VCC 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

Temperature Limit Registers

Reg. 0x4E Remote 1 Temp Low Limit = 0x81 Default

Reg. 0x4F Remote 1 Temp High Limit = 0x7F Default

Reg. 0x6A Remote 1 THERM

THERM

Limit = 0x64 Default

Reg. 0x50 Local Temp Low Limit = 0x81 Default

Reg. 0x51 Local Temp High Limit = 0x7F Default

Reg. 0x6B Local THERM

THERM

Limit = 0x64 Default

Reg. 0x52 Remote 2 Temp Low Limit = 0x81 Default

Reg. 0x53 Remote 2 Temp High Limit = 0x7F Default

Reg. 0x6C Remote 2 THERM

THERM

Limit = 0x64 Default

THERM Limit Register

Reg. 0x7A THERM

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.

Since fans running under speed or stalled are normally the only

conditions of interest, only high limits exist for fan TACHs. Since

fan TACH period is actually being measured, exceeding the limit

indicates a slow or stalled fan.

Fan Limit Registers

Reg. 0x54 TACH1 Minimum Low Byte = 0xFF Default

Reg. 0x55 TACH1 Minimum High Byte = 0xFF Default

Reg. 0x56 TACH2 Minimum Low Byte = 0xFF Default

Reg. 0x57 TACH2 Minimum High Byte = 0xFF Default

Reg. 0x58 TACH3 Minimum Low Byte = 0xFF Default

Reg. 0x59 TACH3 Minimum High Byte = 0xFF Default

Reg. 0x5A TACH4 Minimum Low Byte = 0xFF Default

Reg. 0x5B TACH4 Minimum High Byte = 0xFF Default

Out-of-Limit Comparisons

Once all limits are programmed, the ADT7463 can be enabled

for monitoring. The ADT7463 measures all parameters in

round-robin format and sets the appropriate status bit for out-

of-limit conditions. Comparisons are done differently depending

on whether the measured value is being compared to a high or

low limit.

HIGH LIMIT: > COMPARISON PERFORMED

LOW LIMIT: < OR = COMPARISON PERFORMED

NO INT

LOW LIMIT

TEMP >

LOW LIMIT

Figure 17. Temperature > Low Limit: No INT

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