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ADT7473
4. Select a suitable THERM limit value. This value
determines whether an SMBALERT is generated on
the first THERM assertion, or only if a cumulative
THERM assertion time limit is exceeded. A value of
0x00 causes an SMBALERT to be generated on the
first THERM assertion.
5. Select a THERM monitoring time. This value
specifies how often OS or BIOS level software
checks the THERM timer. For example, BIOS
could read the THERM timer once an hour to
determine the cumulative THERM assertion time.
If, for example, the total THERM assertion time is
<22.76 ms in Hour 1, >182.08 ms in Hour 2, and
>5.825 sec in Hour 3, this can indicate that system
2.914 s
1.457 s
performance is degrading significantly because
THERM is asserting more frequently on an hourly
basis.
Alternatively, OS- or BIOS-level software can
timestamp when the system is powered on. If an
SMBALERT is generated due to the THERM timer
limit being exceeded, another timestamp can be
taken. The difference in time can be calculated for a
fixed THERM timer limit time. For example, if it
takes one week for a THERM timer limit of
2.914 seconds to be exceeded and the next time it
takes only one hour, this is an indication of a
serious degradation in system performance.
2.914 s
1.457 s
THERM
TIMER LIMIT
(REG. 0x7A)
728.32 ms
364.16 ms
182.08 ms
91.04 ms
45.52 ms
22.76 ms
0 1 2 3 4 5 6 7
7 6 5 4 3 2 1 0
728.32 ms
364.16 ms
182.08 ms
91.04 ms
45.52 ms
22.76 ms
THERM TIMER
(REG. 0x79)
THERM
THERM TIMER CLEARED ON READ
COMPARATOR
IN OUT
LATCH
RESET
CLEARED
ON READ
F4P BIT (BIT 5)
INTERRUPT STATUS
REGISTER 2
1 = MASK
F4P BIT (BIT 5)
SMBALERT
INTERRUPT MASK REGISTER 2
(REG. 0x75)
Figure 33. Functional Diagram of the ADT7473 THERM Monitoring Circuitry
Configuring the THERM Pin as Bidirectional
In addition to monitoring THERM as a n input, the
ADT7473/ADT7473 ? 1 can optionally drive THERM low
as an output. When PROCHOT is bidirectional, THERM
can be used to throttle the processor by asserting
PROCHOT. The user can preprogram system-critical
thermal limits. If the temperature exceeds a thermal limit by
0.25 ? C, THERM asserts low. If the temperature is still above
the thermal limit on the next monitoring cycle, THERM
stays low. THERM remains asserted low until the
temperature is equal to or below the thermal limit. Because
the temperature for that channel is measured only once for
every monitoring cycle after THERM asserts, it is
guaranteed to remain low for at least one monitoring cycle.
The THERM pin can be configured to assert low, if the
Remote 1, Local, or Remote 2 THERM temperature limits
are exceeded by 0.25 ? C. The THERM temperature limit
registers are at Register 0x6A, Register 0x6B, and
Register 0x6C, respectively. Setting Bit 5, Bit 6, and Bit 7 of
Configuration Register 5 (0x7C) makes THERM
bidirectional for the Remote 1, Local, and Remote 2
temperature channels, respectively. Figure 34 shows how the
THERM pin asserts low as an output in the event of a critical
overtemperature.
An alternative method of disabling THERM is to program
the THERM temperature limit to –64 ? C or less in Offset 64
mode, or ? 128 ? C or less in twos complement mode; that is,
for THERM temperature limit values less than –63 ? C or
–128 ? C, respectively, THERM is disabled. THERM can
also be disabled by setting Bit 1 of Configuration Register 3
(0x78) to 0.
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