LM64 datasheet(13/29 Pages) NSC

Teilenummer	LM64

Bauteilbeschribung	짹1째C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO?셲

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1.0 Functional Description (Continued)

The data byte has the Most Significant Bit (MSB) first. At the

end of a read, the LM64 can accept either Acknowledge or

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 LM64 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

Filter

No Filter

Level 1

Level 2

20065510

FIGURE 7. Step Response of the Digital Filter

20065511

FIGURE 8. Impulse Response of the Digital Filter

20065512

FIGURE 9. Digital Filter Response in an Intel Pentium 4

processor System. The Filter on and off curves were

purposely offset to better show noise performance.

LM64 Datenblatt(PDF) 13 Page - National Semiconductor (TI)