LM64EVAL National Semiconductor, LM64EVAL Datasheet - Page 13

• Manufacturer Part Number: LM64EVAL
• Description: BOARD EVALUATION LM64
• Manufacturer: National Semiconductor

Specifications of LM64EVAL

• Sensor Type: Temperature, Fan Controller
• Sensing Range: 0°C ~ 85°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: LM64
• Lead Free Status / RoHS Status: Not applicable / Not applicable

1.0 Functional Description
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.
FIGURE 7. Step Response of the Digital Filter
D2
0
0
1
1
Digital Filter Selection Table
D1
0
1
0
1
No Filter
Level 1
Level 1
Level 2
Filter
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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.
FIGURE 8. Impulse Response of the Digital Filter
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