LM75 datasheet(6/18 Pages) NSC

6 / 18 page

Note 5: LM75

θJA (thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil similar to the one shown in Figure 3 is summarized

in the table below:

Device Number

NS Package

Number

Thermal

Resistance (

JA)

LM75BIM-3, LM75BIM-5, LM75CIM-3, LM75CIM-5

M08A

200˚C/W

LM75BIMM-3, LM75BIMM-5, LM75CIMM-3, LM75CIMM-5

MUA08A

250˚C/W

Note 6: All part numbers of the LM75 will operate properly over the +VS supply voltage range of 3V to 5.5V. The devices are tested and specified for rated accuracy

at their nominal supply voltage. Accuracy will typically degrade 1˚C/V of variation in +VS as it varies from the nominal value.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: This specification is provided only to indicate how often temperature data is updated. The LM75 can be read at any time without regard to conversion state

(and will yield last conversion result). If a conversion is in process it will be interrupted and restarted after the end of the read.

Note 9: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy with internal heating. This can cause an error of 0.64˚C at full

rated sink current and saturation voltage based on junction-to-ambient thermal resistance.

Note 10: O.S. Delay is user programmable up to 6 “over limit” conversions before O.S. is set to minimize false tripping in noisy environments.

Note 11: Default values set at power up.

Note 12: Typicals are at TA = 25˚C and represent most likely parametric norm.

Note 13: Holding the SDA line low for a time greater than tTIMEOUT will cause the LM75B to reset SDA to the IDLE state of the serial bus communication (SDA set

High).

01265805

FIGURE 2. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

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