LM77 datasheet(4/23 Pages) TI

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LM77

SNIS103F – JUNE 1999 – REVISED MARCH 2013

www.ti.com

Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for +VS=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +VS=+3.3 Vdc

±10% for LM77CIM-3, LM77CIMM-3

(1). Boldface limits apply for T

A = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C,

unless otherwise noted.

Units

Parameter

Test Conditions

Typical(2)

Limits(3)

(Limit)

Accuracy

TA = −10°C to +65°C

±1.5

TA = −25°C to +100°C

±2.0

°C (max)

TA = −55°C to +125°C

±3.0

Resolution

See(4)

Bits

0.5

°C

Temperature Conversion Time

See(5)

125

Quiescent Current

I2C Inactive

0.25

I2C Active

0.25

0.5

mA (max)

Shutdown Mode

μA

THYST Default Temperature

See(6)(7)

°C

TLOW Default Temperature

See(7)

°C

THIGH Default Temperature

See(7)

°C

TC Default Temperature

See(7)

°C

(1)

Both part numbers of the LM77 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.

(2)

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

(3)

Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).

(4)

9 bits + sign, two's complement

(5)

This specification is provided only to indicate how often temperature data is updated. The LM77 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.

(6)

Hysteresis value adds to the TLOW setpoint value (e.g.: if TLOW setpoint = 10°C, and hysteresis = 2°C, then actual hysteresis point is

10+2 = 12°C); and subtracts from the THIGH and T_CRIT setpoints (e.g.: if THIGH setpoint = 64°C, and hysteresis = 2°C, then actual

hysteresis point is 64

−2 = 62°C). For a detailed discussion of the function of hysteresis refer to Section 1.1, TEMPERATURE

COMPARISON, and Figure 7.

(7)

Default values set at power up.

Logic Electrical Characteristics Digital DC Characteristics

Unless otherwise noted, these specifications apply for +VS=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +VS=+3.3 Vdc

±10% for LM77CIM-3, LM77CIMM-3. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C, unless

otherwise noted.

Units

Parameter

Test Conditions

Typical(1)

Limits(2)

(Limit)

VIN(1)

SDA and SCL Logical “1” Input Voltage

+VS × 0.7

V (min)

+VS+0.3

V (max)

VIN(0)

SDA and SCL Logical “0” Input Voltage

−0.3

V (min)

+VS × 0.3

V (max)

VIN(1)

A0 and A1 Logical “1” Input Voltage

2.0

V (min)

+VS+0.3

V (max)

VIN(0)

A0 and A1 Logical “0” Input Voltage

−0.3

V (min)

0.8

V (max)

IIN(1)

Logical “1” Input Current

VIN = + VS

0.005

1.0

μA (max)

IIN(0)

Logical “0” Input Current

VIN = 0V

−0.005

−1.0

μA (max)

CIN

Capacitance of All Digital Inputs

IOH

Logic “1” Output Leakage Current

VOH = + VS

μA (max)

(1)

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

(2)

Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).

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