25

27

29

31

33

35

37

39

41

43

45

0

50

100

150

200

SAMPLE NUMBER

LM64

with

Filter On

LM64

with

Filter Off

0

5

10

15

20

25

25

30

35

40

45

50

NUMBER OF SAMPLES

No Filter

Filter Level 1

Filter Level 2

0

5

10

15

20

25

25

30

35

40

45

50

NUMBER OF SAMPLES

No Filter

Filter Level 1

Filter Level 2

LM64

SNAS207A – MAY 2004 – REVISED MARCH 2013

www.ti.com

Figure 8. Step Response of the Digital Filter

Figure 9. Impulse Response of the Digital Filter

The Filter on and off curves were purposely offset to better show noise performance.

Figure 10. Digital Filter Response in an Intel Pentium 4 processor System

FAULT QUEUE

The LM64 incorporates a Fault Queue to suppress erroneous ALERT triggering . The Fault Queue prevents false

triggering by requiring three consecutive out-of-limit HIGH, LOW, or T_CRIT temperature readings. See

Figure 11. The Fault Queue defaults to OFF upon power-up and may be activated by setting the RDTS Fault

Queue bit in the Configuration Register to a 1.

16

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