LM75B datasheet(5/31 Pages) TI

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LM75B, LM75C

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SNIS153D – JULY 2009 – REVISED OCTOBER 2015

6.5 Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for: +VS = 5 Vdc for LM75BIM-5, LM75BIMM-5, LM75CIM-5, and

LM75CIMM-5; and +VS = 3.3 Vdc for LM75BIM-3, LM75BIMM-3, LM75CIM-3, and LM75CIMM-3

(1). T

A = TJ = 25°C, unless

otherwise noted.

(2)

PARAMETER

TEST CONDITIONS

MIN(3)

TYP(4)

MAX(3)

UNIT

TA = −25°C to 100°C

–2

Accuracy

°C

TA = −55°C to 125°C

–3

Resolution

Bits

Temperature Conversion Time

See(5)

100

See(5), –55°C

≤ TA ≤ 125°C

300

I2C Inactive

0.25

I2C Inactive, –55°C

≤ TA ≤ 125°C

0.5

LM75B

Shutdown Mode, +VS = 3 V

μA

Shutdown Mode, +VS = 5 V

Quiescent Current

I2C Inactive

0.25

I2C Inactive, –55°C

≤ TA ≤ 125°C

LM75C

Shutdown Mode, +VS = 3 V

μA

Shutdown Mode, +VS = 5 V

O.S. Output Saturation Voltage

IOUT = 4.0 mA, –55°C ≤ TA ≤

0.8

125°C

O.S. Delay

See (6), –55°C

≤ TA ≤ 125°C

Conversions

TOS Default Temperature

See (7)

°C

THYST Default Temperature

(1)

All part numbers of the LM75 will operate properly over the +VS supply voltage range of 3 V to 5.5 V. 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.

(2)

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.

(3)

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

(4)

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

(5)

The conversion-time specification is provided to indicate how often the temperature data is updated. The LM75 can be accessed at any

time and reading the Temperature Register will yield result from the last temperature conversion. When the LM75 is accessed, the

conversion that is in process will be interrupted and it will be restarted after the end of the communication. Accessing the LM75

continuously without waiting at least one conversion time between communications will prevent the device from updating the

Temperature Register with a new temperature conversion result. Consequently, the LM75 should not be accessed continuously with a

wait time of less than 300 ms.

(6)

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

(7)

Default values set at power up.

6.6 Digital DC Characteristics

Unless otherwise noted, these specifications apply for +VS = 5 Vdc for LM75BIM-5, LM75BIMM-5, LM75CIM-5, and

LM75CIMM-5; and +VS = 3.3 Vdc for LM75BIM-3, LM75BIMM-3, LM75CIM-3, and LM75CIMM-3

(1). T

A = TJ = 25°C, unless

otherwise noted.

PARAMETER

TEST CONDITIONS

MIN(2)

TYP(3)

MAX(2)

UNIT

VIN(1)

Logical “1” Input Voltage

–55°C

≤ TA ≤ 125°C

+VS × 0.7

+VS + 0.3

VIN(0)

Logical “0” Input Voltage

–55°C

≤ TA ≤ 125°C

−0.3

+VS × 0.3

IIN(1)

Logical “1” Input Current

VIN = +VS

0.005

μA

VIN = +VS, –55°C ≤ TA ≤

125°C

IIN(0)

Logical “0” Input Current

VIN = 0 V

−0.005

μA

VIN = 0 V, –55°C ≤ TA ≤

−1

125°C

(1)

All part numbers of the LM75 will operate properly over the +VS supply voltage range of 3 V to 5.5 V. 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.

(2)

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

(3)

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

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