LM71 datasheet(4/21 Pages) TI

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LM71, LM71-Q1

SNIS125D – MARCH 2004 – REVISED MARCH 2013

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Device Number

Thermal Resistance (

θJA)

LM71CIMF/LM71QCIMF

250°C/W

LM71CISD

57.6°C/W

Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for V

+ = 2.65V to 3.6V(1). Boldface limits apply for T

A = TJ = TMIN to

TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.

LM71CIMF

Units

Parameter

Conditions

Typical(2)

LM71CISD

(Limit)

Limits(3)

TA = −10°C to +65°C

±1.5

°C (max)

Temperature Error(1)(4)

TA = −40°C to +85°C

±2.0

°C (max)

TA = −40°C to +150°C

+3/

−2

°C (max)

Bits

Resolution

0.03125

°C

Temperature Conversion Time

See(5)

200

270

ms (max)

Quiescent Current

Serial Bus Inactive

300

550

μA (max)

(1)

The LM71 will operate properly over the V+ supply voltage range of 2.65V to 5.5V.

(2)

Typicals are at TA = 25°C and represent most likely parametric norm.

(3)

Limits are ensured to AOQL (Average Outgoing Quality Level).

(4)

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.

(5)

This specification is provided only to indicate how often temperature data is updated. The LM71 can be read at any time without regard

to conversion state (and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be

updated at the completion of the read and a new conversion restarted.

Logic Electrical Characteristics

DIGITAL DC CHARACTERISTICS

Unless otherwise noted, these specifications apply for V

+ = 2.65V to 3.6V(1). Boldface limits apply for T

A = TJ = TMIN to

TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.

Symbol

Parameter

Conditions

Typical(2)

Limits(3)

Units (Limit)

V+ × 0.7

V (min)

VIN(1)

Logical “1” Input Voltage

V+ + 0.3

V (max)

−0.3

V (min)

VIN(0)

Logical “0” Input Voltage

V+ × 0.3

V (max)

Input Hysteresis Voltage

V+ = 3.0V to 3.6V

0.4

0.33

V (min)

IIN(1)

Logical “1” Input Current

VIN = V

0.005

3.0

μA (max)

IIN(0)

Logical “0” Input Current

VIN = 0V

−0.005

−3.0

μA (min)

CIN

All Digital Inputs

VOH

High Level Output Voltage

IOH = −400 μA

2.4

V (min)

VOL

Low Level Output Voltage

IOL = +2 mA

0.4

V (max)

VO = GND

−1

μA (min)

IO_TRI-STATE

TRI-STATE Output Leakage Current

VO = V

μA (max)

(1)

The LM71 will operate properly over the V+ supply voltage range of 2.65V to 5.5V.

(2)

Typicals are at TA = 25°C and represent most likely parametric norm.

(3)

Limits are ensured to AOQL (Average Outgoing Quality Level).

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