SMTAS04USB datasheet(2/9 Pages) ETC1

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DATASHEET

SMT172

last update

maart 20, 2017

reference

V14

page

Specifications

TA= -45°C to 130°C, Vcc=2.7V to 5.5V, unless otherwise noted.

Parameter

Min

Typ

Max

Unit

Conditions

Supply Voltage

2.7

5.5

Active current

µA

TA = -45°C, Vcc = 2.7V, no load at the output pin

µA

TA = 25°C, Vcc = 3.3V, no load at the output pin

µA

TA = 25°C, Vcc = 5.5V, no load at the output pin

Average current

220

TA = 25°C, Vcc = 3.3V, one measurement per second

Power down current

µA

When controlling with Vcc pin

Accuracy TO18

0.25

°C

-10 °C to 100 °C

0.8

°C

-45 °C to 130 °C

0.1

°C

-20 °C to 80 °C (second order interpretation)

0.4

°C

-45 °C to 130 °C (second order interpretation)

Accuracy TO92/TO220

SOT223

0.35

°C

-10 °C to 100 °C

°C

-45 °C to 130 °C

0.25

°C

-20 °C to 80 °C (second order interpretation)

0.8

°C

-45 °C to 130 °C (second order interpretation)

time of measurement

1.8

= 25°C, Vcc = 3.3V, 8 periods

Noise

<0.0002

°C

TA = 25 °C, Vcc = 5 V, 1 s measurement time

Output Duty Cycle

0.11

0.93

-45°C to 130°C

Output frequency

0.5

kHz

1 - 4 kHz for Vcc= 4.7-5.5 V and TA=-25°C to 110°C

PSRR at Vcc

0.1

°C/V

Repeatability

0.01

°C

TA = 25°C, Vcc = 5V, TO18

Startup time

after Vcc, start measurement on first negative edge

Long term drift

0.0058

°C

TA = 22°C, Vcc = 5V, 365 days, TO18

Output impedance

100

by design

Operating Temperature

-45

130

°C

Storage Temperature

-50

150

°C

First order relation between Duty Cycle and temperature

T = 212.77 DC - 68.085

Second order relation between Duty cycle and temperature :

T = -1.43 DC

2 +214.56 DC - 68.6

1: Continuous conversion.

2: All error included, based on moving average of 80 valid duty cycles.

3: ±3σ value. For this accuracy, second order interpretation between Duty Cycle and temperature is used,

where a valid Duty Cycle is based on the averaged value of 8 successive periods.

4: Noise level will be reduced by averaging multiple consecutive measurements. For instance, noise can be

reduced to 0.0004°C and 0.0002 °C by taking average in 0.1s and 1s, respectively. Measurement time

should always be provided when noise is mentioned. The lower limit of the noise is determined by the

flicker noise of the sensor, where further averaging will no longer reduce the noise.

5: Repeatability is defined as difference between multiple measurements on the same temperature point

during multiple temperature cycles

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