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ADT7475
THERM
When using the THERM timer, be aware of the following.
After a THERM timer read (Register 0x79), the following
happens:
THERM
TIMER
(REG. 0x79)
THERM
0 0 0 0 0 0 0 1
7 6 5 4 3 2 1 0
THERM ASSERTED
≤ 22.76 ms
1. The contents of the timer are cleared on read.
2. The F4P bit (Bit 5) of Interrupt Status Register 2
needs to be cleared (assuming that the THERM
timer limit has been exceeded).
If the THERM timer is read during a THERM assertion,
the following happens:
ACCUMULATE THERM LOW
ASSERTION TIMES
THERM 0 0 0 0 0 0 1 0
TIMER 7 6 5 4 3 2 1 0
(REG. 0x79)
THERM
ACCUMULATE THERM LOW
ASSERTION TIMES
THERM ASSERTED
≥ 45.52 ms
1. The contents of the timer are cleared.
2. Bit 0 of the THERM timer is set to 1 (because a
THERM assertion is occurring).
3. The THERM timer increments from zero.
4. If the THERM timer limit (Register 0x7A) = 0x00,
the F4P bit is set.
Generating SMBALERT Interrupts from A THERM
Timer Events
The ADT7475 can generate SMBALERTs when a
programmable THERM timer limit has been exceeded. This
allows the system designer to ignore brief, infrequent
THERM assertions, while capturing longer THERM timer
events. Register 0x7A is the THERM timer limit register.
THERM ASSERTED
THERM 0 0 0 0 0 1 0 1
TIMER 7 6 5 4 3 2 1 0
(REG. 0x79)
≥ 113.8 ms
(91.04 ms + 22.76 ms)
Figure 27. Understanding the THERM Timer
2.914 s
1.457 s
This 8-bit register allows a limit from 0 seconds (first
THERM assertion) to 5.825 seconds to be set before an
SMBALERT is generated. The THERM timer value is
compared with the contents of the THERM timer limit
register.
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 28. Functional Diagram of the ADT7475 THERM Monitoring Circuitry
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