4

LM71, LM71-Q1

SNIS125E – MARCH 2004 – REVISED AUGUST 2018

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Device Number

Thermal Resistance (θJA)

LM71CIMF/LM71QCIMF

250°C/W

LM71CISD

57.6°C/W

(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)

Following a power on reset, the user must allow at least 270 ms before making the first read transaction to ensure a first valid

temperature read. After the first read, in order to ensure an accurate temperature result, the time interval between any two consecutive

temperature reads must be greater than the maximum conversion time of 270 ms. For more information, refer to SNLA296.

6 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.

Parameter

Conditions

Typical(2)

LM71CIMF

LM71CISD

Limits(3)

Units

(Limit)

Temperature Error(1)(4)

TA = −10°C to +65°C

±1.5

°C (max)

TA = −40°C to +85°C

±2.0

°C (max)

TA = −40°C to +150°C

+3/

−2

°C (max)

Resolution

14

0.03125

Bits

°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).

7 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)

VIN(1)

Logical “1” Input Voltage

V+ × 0.7

V (min)

V+ + 0.3

V (max)

VIN(0)

Logical “0” Input Voltage

−0.3

V (min)

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

20

pF

VOH

High Level Output Voltage

IOH = −400 μA

2.4

V (min)

VOL

Low Level Output Voltage

IOL = +2 mA

0.4

V (max)

IO_TRI-STATE

TRI-STATE Output Leakage Current

VO = GND

VO = V

+

−1

+1

μA (min)

μA (max)