TMP442 datasheet(3/29 Pages) TI1

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ELECTRICAL CHARACTERISTICS

TMP441

TMP442

www.ti.com .............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

At TA = –40°C to +125°C and VS = 2.7V to 5.5V, unless otherwise noted.

TMP441, TMP442

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

TEMPERATURE ERROR

Local Temperature Sensor

TELOCAL

TA = –40°C to +125°C

±1.25

±2.5

°C

TA = 0°C to +100°C, VS = 3.3V

±0.25

±1

°C

Remote Temperature Sensor(1)

TEREMOTE

TA = 0°C to +100°C, TDIODE = –40°C to +150°C, VS = 3.3V

±0.25

±1

°C

TA = –40°C to +100°C, TDIODE = –40°C to +150°C, VS = 3.3V

±0.5

±1.5

°C

TA = –40°C to +125°C, TDIODE = –40°C to +150°C

±3

±5

°C

vs Supply (Local/Remote)

VS = 2.7V to 5.5V

0.2

±0.5

°C/V

TEMPERATURE MEASUREMENT

Conversion Time (per channel)

Local Channel

Remote Channel

Beta Correction Enabled(2)

RC = 1

126

137

RC = 0

Beta Correction Disabled(3)

RC = 1

100

RC = 0

Resolution

Local Temperature Sensor

Bits

Remote Temperature Sensor

Bits

Remote Sensor Source Currents

High

Series resistance (beta correction)(4)

120

µA

Medium High

µA

Medium Low

µA

Low

µA

Remote Transistor Ideality Factor

TMP441/TMP442 optimized ideality factor

1.000(2)

1.008(3)

Beta Correction Range

0.1

SMBus INTERFACE

Logic Input High Voltage (SCL, SDA)

VIH

2.1

Logic Input Low Voltage (SCL, SDA)

VIL

0.8

Hysteresis

500

SMBus Output Low Sink Current

SDA Output Low Voltage

VOL

IOUT = 6mA

0.15

0.4

Logic Input Current

≤ VIN ≤ 6V

–1

µA

SMBus Input Capacitance (SCL, SDA)

SMBus Clock Frequency

3.4

MHz

SMBus Timeout

SCL Falling Edge to SDA Valid Time

µs

DIGITAL INPUTS

Input Capacitance

Input Logic Levels

Input High Voltage

VIH

0.7(V+)

(V+)+0.5

Input Low Voltage

VIL

–0.5

0.3(V+)

Leakage Input Current

IIN

≤ VIN ≤ VS

µA

(1)

Tested with less than 5

Ω effective series resistance, 100pF differential input capacitance, and an ideal diode with

η-factor = 1.008. T

A is

the ambient temperature of the TMP441/42. TDIODE is the temperature at the remote diode sensor.

(2)

Beta correction configuration set to '1000' and sensor is GND collector-connected (PNP collector to ground).

(3)

Beta correction configuration set to '0111' or sensor is diode-connected (base shorted to collector).

(4)

If beta correction is disabled ('0111'), then up to 1k

Ω of series line resistance is cancelled; if beta correction is enabled ('1xxx'), up to

300

Ω is cancelled.

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