User guide

1.0 Functional Description (Continued)

No-Acknowledge from the Master. Note that the No-

Acknowledge is typically used as a signal for the slave

indicating that the Master has read its last byte.

1.9 DIGITAL FILTER

The LM63 incorporates a user-configured digital filter to

suppress erroneous Remote Temperature readings due to

noise. The filter is accessed in the Remote Diode Tempera-

ture Filter and Comparator Mode Register. The filter can be

set according to the following table.

Level 2 is maximum filtering.

Digital Filter Selection Table

D2 D1 Filter

0 0 No Filter

0 1 Level 1

1 0 Level 1

1 1 Level 2

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FIGURE 6. Step Response of the Digital Filter

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FIGURE 7. Impulse Response of the Digital Filter

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FIGURE 8. Digital Filter Response in an Intel Pentium 4

processor System. The Filter on and off curves were

purposely offset to better show noise performance.

LM63