TEXAS INSTRUMENTS TMP441, TMP442 Technical data

TMP441 TMP442

+5V

1ChannelLocal

1ChannelRemote

1ChannelLocal

2ChannelsRemote

SCL

GND

SDA

V+

SMBus

Controller

8

5

7

6

DXP

DXN

A1

A0

1

2

3

4

DXP1

DXN1

DXP2

DXN2

1

2

3

4

TMP441
TMP442

www.ti.com

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

± 1 ° C TEMPERATURE SENSOR

with Automatic Beta Compensation,

Series-R, and η -Factor in a SOT23-8

1

FEATURES DESCRIPTION

234

• SOT23-8 PACKAGE

• ± 1 ° C REMOTE DIODE SENSOR (MAX)

• ± 1 ° C LOCAL TEMPERATURE SENSOR (MAX)

• AUTOMATIC BETA COMPENSATION

• SERIES RESISTANCE CANCELLATION microcontrollers, microprocessors, or

• η -FACTOR CORRECTION

• TWO-WIRE/ SMBus™ SERIAL INTERFACE

• MULTIPLE INTERFACE ADDRESSES

• DIODE FAULT DETECTION

• RoHS-COMPLIANT AND NO Sb/Br configure the device.

• TRANSISTOR AND DIODE MODEL

OPERATION

APPLICATIONS

• PROCESSOR/FPGA TEMPERATURE

MONITORING

• LCD/ DLP

• SERVERS

• CENTRAL OFFICE TELECOM EQUIPMENT

• STORAGE AREA NETWORKS (SAN)

®

/LCOS PROJECTORS

The TMP441 and TMP442 are remote temperature
monitors with a built-in local temperature sensor.
Remote temperature sensor diode-connected
transistors are typically low-cost, NPN- or PNP-type
transistors or diodes that are an integral part of

field-programmable gate arrays (FPGAs).
Remote accuracy is ± 1 ° C for multiple IC

manufacturers, with no calibration needed. The
Two-Wire serial interface accepts SMBus write byte,
read byte, send byte, and receive byte commands to

The TMP441 has a single remote temperature
monitor with address pins. The TMP442 has dual
remote temperature monitors, and is available with
two different interface addresses. All versions include
automatic beta compensation (correction), series
resistance cancellation, programmable non-ideality
factor ( η -factor), wide remote temperature
measurement range (up to +150 ° C), and diode fault
detection.

The TMP441 and TMP442 are both available in an
8-lead, SOT23 package.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 DLP is a registered trademark of Texas Instruments.
3 SMBus is a trademark of Intel Corporation.
4 All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

Copyright © 2008 – 2009, Texas Instruments Incorporated

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

PACKAGE INFORMATION

PRODUCT DESCRIPTION ADDRESS PACKAGE-LEAD DESIGNATOR MARKING

TMP441 Remote Junction 100 11xx SOT23-8 DCN DIGI

TMP442A Dual-Channel 100 1100 SOT23-8 DCN DIHI
TMP442B 100 1101 SOT23-8 DCN DIJI

(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com .

ABSOLUTE MAXIMUM RATINGS

Single-Channel

Temperature Sensor

Remote Junction

Temperature Sensor

(1)

TWO-WIRE PACKAGE PACKAGE

(1)

www.ti.com

Over operating free-air temperature range, unless otherwise noted.

PARAMETER TMP441, TMP442 UNIT

Power Supply V

Input Voltage

Input Current 10 mA
Operating Temperature Range – 55 to +127 ° C
Storage Temperature Range – 60 to +130 ° C
Junction Temperature TJmax +150 ° C

ESD Rating Charged Device Model CDM 1000 V

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.

Pins 1, 2, 3, and 4 only – 0.5 to VS+ 0.5 V
Pins 6 and 7 only – 0.5 to 7 V

Human Body Model HBM 3000 V

Machine Model MM 200 V

S

+7 V

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Product Folder Link(s): TMP441 TMP442

TMP441
TMP442

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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

ELECTRICAL CHARACTERISTICS

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 TE

Remote Temperature Sensor

(1)

LOCAL

TE

REMOTE

TA= 0 ° C to +100 ° C, T

TA= – 40 ° C to +100 ° C, T

TA= – 40 ° C to +125 ° C, T

vs Supply (Local/Remote) VS= 2.7V to 5.5V 0.2 ± 0.5 ° C/V

TEMPERATURE MEASUREMENT

Conversion Time (per channel)

Local Channel 12 15 17 ms
Remote Channel

MBeta Correction Enabled

MBeta Correction Disabled

(2)

(3)

Resolution

Local Temperature Sensor 12 Bits
Remote Temperature Sensor 12 Bits

Remote Sensor Source Currents

High Series resistance (beta correction)
Medium High 60 µ A
Medium Low 12 µ A
Low 6 µ A

Remote Transistor Ideality Factor η TMP441/TMP442 optimized ideality factor 1.000

Beta Correction Range β 0.1 27

SMBus INTERFACE

Logic Input High Voltage (SCL, SDA) V
Logic Input Low Voltage (SCL, SDA) V

IH

IL

Hysteresis 500 mV
SMBus Output Low Sink Current 6 mA
SDA Output Low Voltage V

OL

Logic Input Current 0 ≤ VIN≤ 6V – 1 +1 µ A
SMBus Input Capacitance (SCL, SDA) 3 pF
SMBus Clock Frequency 3.4 MHz
SMBus Timeout 25 32 35 ms
SCL Falling Edge to SDA Valid Time 1 µ s

DIGITAL INPUTS

Input Capacitance 3 pF
Input Logic Levels

Input High Voltage V
Input Low Voltage V
Leakage Input Current I

IH

IL

IN

(1) Tested with less than 5 Ω effective series resistance, 100pF differential input capacitance, and an ideal diode with η -factor = 1.008. TAis

the ambient temperature of the TMP441/42. T

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

DIODE

(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.

TA= – 40 ° C to +125 ° C ± 1.25 ± 2.5 ° C

TA= 0 ° C to +100 ° C, VS= 3.3V ± 0.25 ± 1 ° C

= – 40 ° C to +150 ° C, VS= 3.3V ± 0.25 ± 1 ° C

DIODE

= – 40 ° C to +150 ° C, VS= 3.3V ± 0.5 ± 1.5 ° C

DIODE

= – 40 ° C to +150 ° C ± 3 ± 5 ° C

DIODE

RC = 1 97 126 137 ms
RC = 0 36 47 52 ms
RC = 1 72 93 100 ms
RC = 0 33 44 47 ms

(4)

120 µ A

(2)
(3)

1.008

2.1 V

I

= 6mA 0.15 0.4 V

OUT

0.7(V+) (V+)+0.5 V
– 0.5 0.3(V+) V

0V ≤ VIN≤ V

S

is the temperature at the remote diode sensor.

0.8 V

1 µ A

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Link(s): TMP441 TMP442

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

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

POWER SUPPLY

Specified Voltage Range V
Quiescent Current I

Undervoltage Lockout UVLO 2.3 2.4 2.6 V
Power-On Reset Threshold POR 1.6 2.3 V

TEMPERATURE RANGE

Specified Range – 40 +125 ° C
Storage Range – 60 +130 ° C
Thermal Resistance, SOT23-8 θ

S

Q

JA

0.0625 conversions per second 35 45 µ A
Eight conversions per second

Serial Bus inactive, Shutdown Mode 3 10 µ A
Serial Bus active, fS= 400kHz, Shutdown Mode 90 µ A
Serial Bus active, fS= 3.4MHz, Shutdown Mode 350 µ A

(5)

(5) Beta correction disabled.

2.7 5.5 V

0.7 1 mA

170 ° C/W

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Product Folder Link(s): TMP441 TMP442

1

2

3

4

8

7

6

5

V+

SCL

GND

DXP

DXN

A1

A0

SDA

TMP441

1

2

3

4

8

7

6

5

V+

SCL

GND

DXP1

DXN1

DXP2

DXN2

SDA

TMP442

TMP441
TMP442

www.ti.com

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

TMP441 PIN CONFIGURATION

DCN PACKAGE

SOT23-8

(TOP VIEW)

TMP441 PIN ASSIGNMENTS

TMP441

NO. NAME DESCRIPTION

1 DXP Positive connection to remote temperature sensor
2 DXN Negative connection to remote temperature sensor
3 A1 Address pin
4 A0 Address pin
5 GND Ground
6 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+.
7 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+.
8 V+ Positive supply voltage (2.7V to 5.5V)

TMP442 PIN CONFIGURATION

DCN PACKAGE

SOT23-8

(TOP VIEW)

TMP442 PIN ASSIGNMENTS

TMP442

NO. NAME DESCRIPTION

1 DXP1 Channel 1 positive connection to remote temperature sensor
2 DXN1 Channel 1 negative connection to remote temperature sensor
3 DXP2 Channel 2 positive connection to remote temperature sensor
4 DXN2 Channel 2 negative connection to remote temperature sensor
5 GND Ground
6 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+.
7 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+.
8 V+ Positive supply voltage (2.7V to 5.5V)

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 5

Product Folder Link(s): TMP441 TMP442

3

2

1

0

1

2

3

-

-

-

RemoteTemperatureError( C)°

-50 -25 0 25 50

75

100 125

AmbientTemperature,T (

A

C)°

BetaCompensationDisabled.
GNDCollector-ConnectedTransistorwithn-Factor=1.008.

3

2

1

0

1

2

3

-

-

-

LocalTemperatureError( C)

°

-50 -25 0 25 50

75

100 125

AmbientTemperature,T (

A

C)°

700

600

500

400

300

200

100

0

I ( A)

m

Q

0.0625 0.125 0.25 0.5 1 2

4

8

ConversionRate(conversions/s)

TMP441

TMP442

V =5.5V

S

150

100

50

0

50

100--

-150

RemoteTemperatureError(

C)

°

0 5 10 15 20 3025

LeakageResistance(M )W

R

GND

(LowBeta)

R

Vs

RVs(LowBeta)

R

GND

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

I ( A)

m

Q

2.5 3.0 3.5 4.0 4.5 5.0 5.5

V (V)

S

500

450

400

350

300

250

200

150

100

50

0

I ( A)

m

Q

1k 10k 100k 1M 10M

SCLClockFrequency(Hz)

V =3.3V

S

V =5.5V

S

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

www.ti.com

TYPICAL CHARACTERISTICS

At TA= +25 ° C and VS= +3.3V, unless otherwise noted.

REMOTE TEMPERATURE ERROR LOCAL TEMPERATURE ERROR

vs TEMPERATURE vs TEMPERATURE

Figure 1. Figure 2.

REMOTE TEMPERATURE ERROR QUIESCENT CURRENT

vs LEAKAGE RESISTANCE vs CONVERSION RATE

Figure 3. Figure 4.

SHUTDOWN QUIESCENT CURRENT SHUTDOWN QUIESCENT CURRENT

vs SCL CLOCK FREQUENCY vs SUPPLY VOLTAGE

6 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated

Figure 5. Figure 6.

Product Folder Link(s): TMP441 TMP442

2.5

2.0

1.5

1.0

0.5

0

0.5

1.0

1.5

2.0

2.5-

-

-

-

-

RemoteTemperatureError( C)

°

0 100 200 300 400 500

R ( )W

S

3

2

1

0

1

2

3

-

-

-

RemoteTemperatureError( C)

°

0 100 200 300 400 500 600 700 800 900

1k

R ( )W

S

Diode-ConnectedTransistor,2N3906(PNP)

(2)

GNDCollector-ConnectedTransistor,2N3906(PNP)

(1)(2)

NOTES(1):Temperatureoffsetistheresultof

-factorbeingautomaticallysetto1.000.

Approximate -factorof2N3906is1.008.

h

h

SeeFigure10forschematicconfiguration.(2)

3.0

2.5

2.0

1.5

1.0

0.5

0

0.5

1.0

1.5

2.0

2.5

3.0

-

-

-

-

-

-

RemoteTemperatureError(

C)

°

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Capacitance(nF)

Low-BetaTransistor(Disabled)

Low-BetaTransistor
(Auto)

GNDCollector-ConnectedTransistor(Disabled)

GNDCollector-ConnectedTransistor(Auto)

Diode-ConnectedTransistor(Auto,Disabled)

NOTE:SeeFigure11forschematicconfiguration.

(b) Diode-ConnectedTransistor

(a) GNDCollector-ConnectedTransistor

DXP

DXN

C

DIFF

(1)

DXP

DXN

C

DIFF

(1)

(b) Diode-ConnectedTransistor

(a) GNDCollector-ConnectedTransistor

DXP

DXN

R

S

(1)

R

S

(1)

DXP

DXN

R

S

(1)

R

S

(1)

TMP441
TMP442

www.ti.com

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

TYPICAL CHARACTERISTICS (continued)

At TA= +25 ° C and VS= +3.3V, unless otherwise noted.

REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE (Low-Beta Transistor)

Figure 7. Figure 8.

REMOTE TEMPERATURE ERROR
vs DIFFERENTIAL CAPACITANCE

REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE

SERIES RESISTANCE CONFIGURATION DIFFERENTIAL CAPACITANCE CONFIGURATION

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 7

(1) R

should be less than 1k Ω ; see Filtering (1) C

S

section. section.

Figure 9.

should be less than 300pF; see Filtering

DIFF

Figure 10. Figure 11.

Product Folder Link(s): TMP441 TMP442

0.1 Fm

10kW
(typ)

10kW
(typ)

TMP441

DXP

DXN

V+

8

7

6

5

2

1

R

S

(2)

R

S

(2)

C

DIFF

(3)

C

DIFF

(3)

R

S

(2)

R

S

(2)

GND

SCL

SDA

+5V

SMBus

Controller

Diode-connectedtransistorconfiguration :

(1)

SeriesResistance

GNDcollector-connectedtransistorconfiguration:

(1)

(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.

GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.

(2)R shouldbe<1kW inmostapplications.SelectionofR dependsonapplication;seethe section.Filtering

S

S

(3)C shouldbe<500pFinmostapplications.SelectionofC dependsonapplication;

DIFF

DIFF

NOTES:

A1

A0

4

3

seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.

TMP442

DXP1

DXN1

5

2

1

R

S

(2)

R

S

(2)

C

DIFF

(3)

C

DIFF

(3)

R

S

(2)

R

S

(2)

GND

Diode-connectedtransistorconfiguration :

(1)

SeriesResistance

GNDcollector-connectedtransistorconfiguration:

(1)

(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.

GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.

(2)R shouldbe<1kW inmostapplications. SelectionofR dependsonapplication;seethe section.

SelectionofC dependsonapplication;

Filtering

(3)C shouldbe<500pFinmostapplications.

S

S

DIFF

DIFF

NOTES:

DXP2

DXN2

4

3

R

S

(2)

R

S

(2)

C

DIFF

(3)

0.1 Fm

10kW
(typ)

10kW
(typ)

V+

8

7

6

SCL

SDA

+5V

SMBus

Controller

DXP1

DXN1

DXP2

DXN2

seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

APPLICATION INFORMATION

The TMP441/42 are digital temperature sensors that
combine a local die temperature measurement
channel and one (TMP441) or two (TMP442) remote
junction temperature measurement channels in a
single SOT23-8 package. The TMP441/42 are
Two-Wire- and SMBus interface-compatible and are
specified over a temperature range of – 40 ° C to
+125 ° C. The TMP441/42 contain multiple registers
for holding configuration information and temperature
measurement results.

www.ti.com

For proper remote temperature sensing operation, the
TMP441 requires only a transistor connected
between DXP and DXN; the TMP442 requires
transistors connected between DXP1 and DXN1 and
between DXP2 and DXN2. The SCL and SDA
interface pins require pull-up resistors as part of the
communication bus. A 0.1 µ F power-supply bypass
capacitor is recommended for good local bypassing.

Figure 12 shows a typical configuration for the

TMP441; Figure 13 shows a typical configuration for
the TMP442.

8 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated

Figure 12. TMP441 Basic Connections

Figure 13. TMP442 Basic Connections

Product Folder Link(s): TMP441 TMP442

TMP441
TMP442

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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

BETA COMPENSATION TEMPERATURE MEASUREMENT DATA

Previous generations of remote junction temperature Temperature measurement data are taken over a
sensors were operated by controlling the emitter default range of – 55 ° C to +127 ° C for both local and
current of the sensing transistor. However, remote locations. However, measurements from
examination of the physics of a transistor shows that – 55 ° C to +150 ° C can be made both locally and
V

is actually a function of the collector current. If remotely by reconfiguring the TMP441/42 for the

BE

beta is independent of the collector current, then V

BE

may be calculated from the emitter current. In earlier section. Temperature data resulting from conversions
generations of processors that contained PNP within the default measurement range are
transistors connected to these temperature sensors, represented in binary form, as shown in Table 1 ,
controlling the emitter current provided acceptable Standard Binary column. Note that any temperature
temperature measurement results. At 90nm process below – 64 ° C results in a data value of – 64 (C0h).
geometry and below, the beta factor continues to Likewise, temperatures above +127 ° C result in a
decrease and the premise that it is independent of value of 127 (7Fh). The device can be set to measure
collector current becomes less certain. over an extended temperature range by changing bit

To manage this increasing temperature measurement
error, the TMP441/42 control the collector current
instead of the emitter current. The TMP441/42
automatically detect and choose the correct range
depending on the beta factor of the external
transistor. This auto-ranging is performed at the
beginning of each temperature conversion in order to
correct for any changes in the beta factor as a result
of temperature variation. The device can operate a
PNP transistor with a beta factor as low as 0.1. See
the Beta Compensation Configuration Register

Section for further information.

SERIES RESISTANCE CANCELLATION

Series resistance in an application circuit that typically
results from printed circuit board (PCB) trace
resistance and remote line length (see Figure 12 ) is
automatically cancelled by the TMP441/42,
preventing what would otherwise result in a
temperature offset. A total of up to 1k Ω of series line
resistance is cancelled by the TMP441/42 if beta ( ° C) BINARY HEX BINARY HEX
correction is disabled and up to 300 Ω of series line
resistance is cancelled if beta correction is enabled,
eliminating the need for additional characterization
and temperature offset correction. See the two

Remote Temperature Error vs Series Resistance

typical characteristic curves (Figure 7 and Figure 8 )
for details on the effect of series resistance on
sensed remote temperature error.

DIFFERENTIAL INPUT CAPACITANCE

The TMP441/42 can tolerate differential input
capacitance of up to 500pF if beta correction is
enabled, and 1000pF if beta correction is disabled
with minimal change in temperature error. The effect
of capacitance on sensed remote temperature error is
illustrated in Figure 9 , Remote Temperature Error vs 175 0111 1111 7F 1110 1111 EF
Differential Capacitance. See the Filtering section for
suggested component values where filtering
unwanted coupled signals is needed.

extended temperature range, as described in this

2 (RANGE) of Configuration Register 1 from low to
high. The change in measurement range and data
format from standard binary to extended binary
occurs at the next temperature conversion. For data
captured in the extended temperature range
configuration, an offset of 64 (40h) is added to the
standard binary value, as shown in the Extended
Binary column of Table 1 . This configuration allows
measurement of temperatures as low as – 64 ° C, and
as high as +191 ° C; however, most
temperature-sensing diodes only measure with the
range of – 55 ° C to +150 ° C. Additionally, the
TMP441/42 are rated only for ambient temperatures
ranging from – 40 ° C to +125 ° C. Parameters in the

Absolute Maximum Ratings table must be observed.

Table 1. Temperature Data Format (Local and

Remote Temperature High Bytes)

LOCAL/REMOTE TEMPERATURE REGISTER

HIGH BYTE VALUE (1 ° C RESOLUTION)

TEMP

– 64 1100 0000 C0 0000 0000 00
– 50 1100 1110 CE 0000 1110 0E
– 25 1110 0111 E7 0010 0111 27

0 0000 0000 00 0100 0000 40
1 0000 0001 01 0100 0001 41

5 0000 0101 05 0100 0101 45
10 0000 1010 0A 0100 1010 4A
25 0001 1001 19 0101 1001 59
50 0011 0010 32 0111 0010 72
75 0100 1011 4B 1000 1011 8B

100 0110 0100 64 1010 0100 A4
125 0111 1101 7D 1011 1101 BD
127 0111 1111 7F 1011 1111 BF
150 0111 1111 7F 1101 0110 D6

191 0111 1111 7F 1111 1111 FF

(1) Resolution is 1 ° C/count. Negative numbers are represented in

(2) Resolution is 1 ° C/count. All values are unsigned with a – 64 ° C

STANDARD BINARY

twos complement format.

offset.

(1)

EXTENDED BINARY

(2)

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TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

Both local and remote temperature data use two
bytes for data storage. The high byte stores the
temperature with 1 ° C resolution. The second or low
byte stores the decimal fraction value of the
temperature and allows a higher measurement
resolution, as shown in Table 2 . The measurement
resolution for both the local and remote channels is

0.0625 ° C, and cannot be adjusted.

Table 2. Decimal Fraction Temperature Data

Format (Local and Remote Temperature Low

Bytes)

TEMPERATURE REGISTER LOW BYTE

(0.0625 ° C RESOLUTION)

TEMP STANDARD AND EXTENDED

( ° C) BINARY HEX

0 0000 0000 00

0.0625 0001 0000 10

0.1250 0010 0000 20

0.1875 0011 0000 30

0.2500 0100 0000 40

0.3125 0101 0000 50

0.3750 0110 0000 60

0.4375 0111 0000 70

0.5000 1000 0000 80

0.5625 1001 0000 90

0.6250 1010 0000 A0

0.6875 1011 0000 B0

0.7500 1100 0000 C0

0.8125 1101 0000 D0

0.8750 1110 0000 E0

0.9375 1111 0000 F0

(1) Resolution is 0.0625 ° C/count. All possible values are shown.

VALUE

(1)

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Standard Binary to Decimal Temperature Data Calculation Example

High byte conversion (for example, 0111 0011):

Convert the right-justified binary high byte to
hexadecimal.

From hexadecimal, multiply the first number by

0

16

= 1 and the second number by 16

1

= 16.
The sum equals the decimal equivalent.
0111 0011b → 73h → (3 × 16

0

) + (7 × 16

1

) = 115

Low byte conversion (for example, 0111 0000):

To convert the left-justified binary low-byte to
decimal, use bits 7 through 4 and ignore bits 3
through 0 because they do not affect the value of
the number.

0111b → (0 × 1/2)
(1 × 1/2)

3

+ (1 × 1/2)

1

4

= 0.4375

+ (1 × 1/2)

Note that the final numerical result is the sum of the
high byte and low byte. In negative temperatures, the
unsigned low byte adds to the negative high byte to
result in a value more than the high byte (for
instance, – 15 + 0.75 = – 14.25, not – 15.75).

Standard Decimal to Binary Temperature Data Calculation Example

For positive temperatures (for example, +20 ° C):

(+20 ° C)/(1 ° C/count) = 20 → 14h → 0001 0100
Convert the number to binary code with 8-bit,

right-justified format, and MSB = '0' to denote a
positive sign.

+20 ° C is stored as 0001 0100 → 14h.

For negative temperatures (for example, – 20 ° C):

(| – 20 ° C|)/(1 ° C/count) = 20 → 14h → 0001 0100
Generate the twos complement of a negative

number by complementing the absolute value
binary number and adding 1.

– 20 ° C is stored as 1110 1100 → ECh.

2

+

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One-ShotStartRegister

ConfigurationRegisters

StatusRegister

IdentificationRegisters

h-FactorCorrectionRegisters

ConversionRateRegister

LocalandRemoteTemperatureRegisters

SDA

SCL

PointerRegister

I/O

Control

Interface

SoftwareReset

b-CompensationRegister

TMP441
TMP442

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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

REGISTER INFORMATION

The TMP441/42 contain multiple registers for holding
configuration information, temperature measurement
results, and status information. These registers are
described in Figure 14 and Table 3 .

POINTER REGISTER

Figure 14 shows the internal register structure of the

TMP441/42. The 8-bit Pointer Register is used to
address a given data register. The Pointer Register
identifies which of the data registers should respond
to a read or write command on the Two-Wire bus.
This register is set with every write command. A write
command must be issued to set the proper value in
the Pointer Register before executing a read
command. Table 3 describes the pointer address of Figure 14. Internal Register Structure
the TMP441/42 registers. The power-on reset (POR)
value of the Pointer Register is 00h (0000 0000b).

Table 3. Register Map

POINTER POR

(HEX) (HEX) 7 6 5 4 3 2 1 0 REGISTER DESCRIPTION

00 00 LT11 LT10 LT9 LT8 LT7 LT6 LT5 LT4 Local Temperature (High Byte)
01 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Remote Temperature 1 (High Byte)
02 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Remote Temperature 2 (High Byte)
08 BUSY 0 0 0 0 0 0 0 Status Register
09 00 0 SD 0 0 0 RANGE 0 0 Configuration Register 1
0A 1C/3C
0B 07 0 0 0 0 0 R2 R1 R0 Conversion Rate Register
0C 08/88
0F X X X X X X X X One-Shot Start
10 00 LT3 LT2 LT1 LT0 0 0 nPVLD 0 Local Temperature (Low Byte)
11 00 RT3 RT2 RT1 RT0 0 0 nPVLD OPEN Remote Temperature 1 (Low Byte)
12 00 RT3 RT2 RT1 RT0 0 0 nPVLD OPEN Remote Temperature 2 (Low Byte)
21 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 η Correction 1
22 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 η Correction 2
FC X X X X X X X X Software Reset
FE 55 0 1 0 1 0 1 0 1 Manufacturer ID

FF

(2)

0 0 REN2

(2)

41 0 1 0 0 0 0 0 1 TMP441 Device ID
42 0 1 0 0 0 0 1 0 TMP442 Device ID

(2)

BC23

(2)

BC22

BC21

(1) Compatible with Two-Byte Read; see Figure 18 .
(2) TMP442 only.
(3) X = undefined. Writing any value to this register initiates a one-shot start; see the One-Shot Conversion section.
(4) X = undefined. Writing any value to this register initiates a software reset; see the Software Reset section.

BIT DESCRIPTION

(2)

REN LEN RC 0 0 Configuration Register 2

(2)

(2)

BC20

BC13 BC12 BC11 BC10 Beta Compensation

(1)

(1)
(1) (2)

(3)

(2)

(2)

(4)

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TMP442

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TEMPERATURE REGISTERS STATUS REGISTER

The TMP441/42 have four 8-bit registers that hold The Status Register reports the state of the
temperature measurement results. Both the local temperature ADCs. Table 4 shows the Status
channel and the remote channel have a high byte Register bits. The Status Register is read-only, and is
register that contains the most significant bits (MSBs) read by accessing pointer address 08h. The BUSY bit
of the temperature analog-to-digital converter (ADC) = '1' if the ADC is making a conversion; it is set to '0'
result and a low byte register that contains the least if the ADC is not converting.
significant bits (LSBs) of the temperature ADC result.
The local channel high byte address is 00h; the local
channel low byte address is 10h. The remote channel
high byte is at address 01h; the remote channel low
byte address is 11h. For the TMP442, the second
remote channel high byte address is 02h; the second
remote channel low byte is 12h. These registers are
read-only and are updated by the ADC each time a
temperature measurement is completed.

The TMP441/42 contain circuitry to assure that a low
byte register read command returns data from the
same ADC conversion as the immediately preceding
high byte read command. This condition remains
valid only until another register is read. For proper
operation, the high byte of a temperature register
should be read first. The low byte register should be
read in the next read command. The low byte register
may be left unread if the LSBs are not needed.
Alternatively, the temperature registers may be read
as a 16-bit register by using a single two-byte read
command from address 00h for the local channel
result, or from address 01h for the remote channel
result (02h for the second remote channel result).
The high byte is output first, followed by the low byte.
Both bytes of this read operation are from the same
ADC conversion. The power-on reset value of all
temperature registers is 00h.

CONFIGURATION REGISTER 1

Configuration Register 1 (pointer address 09h) sets
the temperature range and controls shutdown mode.
The Configuration Register is set by writing to pointer
address 09h and read by reading from pointer
address 09h. The shutdown (SD) bit (bit 6) enables or
disables the temperature measurement circuitry. If
SD = '0', the TMP441/42 convert continuously at the
rate set in the conversion rate register. When SD is
set to '1', the TMP441/42 stop converting when the
current conversion sequence is complete and enters
a shutdown mode. When SD is set to '0' again, the
TMP441/42 resume continuous conversions. When
SD = '1', a single conversion can be started by writing
to the One-Shot Register.

The temperature range is set by configuring bit 2 of
the Configuration Register. Setting this bit low
configures the TMP441/42 for the standard
measurement range ( – 55 ° C to +127 ° C); temperature
conversions are stored in the standard binary format.
Setting bit 2 high configures the TMP441/42 for the
extended measurement range ( – 55 ° C to +150 ° C);
temperature conversions are stored in the extended
binary format (see Table 1 ). The remaining bits of the
Configuration Register are reserved and must always
be set to '0'. The power-on reset value for this
register is 00h. Table 5 summarizes the bits of
Configuration Register 1.

Table 4. Status Register Format

STATUS REGISTER (Read = 08h, Write = NA)

BIT # D7 D6 D5 D4 D3 D2 D1 D0

BIT NAME BUSY 0 0 0 0 0 0 0

POR VALUE 0

(1) The BUSY changes to ' 1 ' almost immediately ( < 100 µ s) following power-up, as the TMP441/42 begins the first temperature conversion.

It is high whenever the TMP441/42 converts a temperature reading.

(1)

0 0 0 0 0 0 0

Table 5. Configuration Register 1 Bit Descriptions

CONFIGURATION REGISTER 1 (Read/Write = 09h, POR = 00h)

BIT NAME FUNCTION POWER-ON RESET VALUE

7 Reserved — 0
6 SD 0

5, 4, 3 Reserved — 0

2 Temperature Range 0

1, 0 Reserved — 0

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0 = Run

1 = Shut down

0 = – 55 ° C to +127 ° C
1 = – 55 ° C to +150 ° C

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TMP442

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ONE-SHOT CONVERSION

When the TMP441/42 are in shutdown mode (SD = 1
in the Configuration Register 1), a single conversion

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

The LEN bit enables the local temperature
measurement channel. If LEN = '1', the local channel
is enabled; if LEN = '0', the local channel is disabled.

can start on all enabled channels by writing any value The REN bit enables external temperature
to the One-Shot Start Register, pointer address 0Fh. measurement channel 1 (connected to pins 1 and 2.)
This write operation starts one conversion; the If REN = '1', the external channel is enabled; if REN =
TMP441/42 return to shutdown mode when that '0', the external channel is disabled.
conversion completes. The value of the data sent in
the write command is irrelevant and is not stored by
the TMP441/42. When the TMP441/42 are in
shutdown mode, the conversion sequence currently
in process must be completed before a one-shot
command can be issued. One-shot commands issued
during a conversion are ignored.

For the TMP442 only, the REN2 bit enables the
second external measurement channel (connected to
pins 3 and 4.) If REN2 = '1', the second external
channel is enabled; if REN2 = '0', the second external
channel is disabled.

The temperature measurement sequence is local
channel, external channel 1, external channel 2,

CONFIGURATION REGISTER 2

Configuration Register 2 (pointer address 0Ah)
controls which temperature measurement channels
are enabled and whether the external channels have
the resistance correction feature enabled or not.

The RC bit enables the resistance correction feature
for the external temperature channels. If RC = '1',
series resistance correction is enabled; if RC = '0',
resistance correction is disabled. Resistance
correction should be enabled for most applications.
However, disabling the resistance correction may
yield slightly improved temperature measurement
noise performance, and reduce conversion time by
about 50%, which could lower power consumption
when conversion rates of two per second or less are
selected.

shutdown, and delay (to set conversion rate, if
necessary). The sequence starts over with the local
channel. If any of the channels are disabled, they are
skipped in the sequence. Table 6 summarizes the
bits of Configuration Register 2.

CONVERSION RATE REGISTER

The Conversion Rate Register (pointer address 0Bh)
controls the rate at which temperature conversions
are performed. This register adjusts the idle time
between conversions but not the conversion timing
itself, thereby allowing the TMP441/42 power
dissipation to be balanced with the temperature
register update rate. Table 7 shows the conversion
rate options and corresponding current consumption.
A one-shot command can be used during the idle
time between conversions to immediately start
temperature conversions on all enabled channels.

Table 6. Configuration Register 2 Bit Descriptions

CONFIGURATION REGISTER 2 (Read/Write = 0Ah, POR = 1Ch for TMP441; 3Ch for TMP442)

BIT NAME FUNCTION POWER-ON RESET VALUE

7, 6 Reserved — 0

5 REN2

4 REN 1

3 LEN 1

2 RC 1

1, 0 Reserved — 0

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0 = External channel 2 disabled 1 (TMP442)

1 = External channel 2 enabled 0 (TMP441)

0 = External channel 1 disabled

1 = External channel 1 enabled

0 = Local channel disabled
1 = Local channel enabled

0 = Resistance correction disabled

1 = Resistance correction enabled

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

BETA COMPENSATION CONFIGURATION

continue to be GND collector-connected in this mode,

REGISTER but no beta compensation is applied. When the beta

If the Beta Compensation Configuration Register is
set to '1xxx' (beta compensation enabled) for a given
channel at the beginning of each temperature
conversion, the TMP441/42 automatically detects if
the sensor is diode-connected or GND
collector-connected, selects the proper beta range,
and measures the sensor temperature appropriately.

If the Beta Compensation Configuration Register is
set to '0111' (beta compensation disabled) for a given
channel, the automatic detection is bypassed and the
temperature is measured assuming a
diode-connected sensor. A PNP transistor may

Table 7. Conversion Rate Register

CONVERSION RATE REGISTER (Read/Write = 0Bh, POR = 07h)

R7 R6 R5 R4 R3 R2 R1 R0 CONVERSIONS/SEC TMP441 TMP442

0 0 0 0 0 0 0 0 0.0625 30 35
0 0 0 0 0 0 0 1 0.125 35 44
0 0 0 0 0 0 1 0 0.25 45 62
0 0 0 0 0 0 1 1 0.5 65 99
0 0 0 0 0 1 0 0 1 103 162
0 0 0 0 0 1 0 1 2 181 272
0 0 0 0 0 1 1 0 4 332 437
0 0 0 0 0 1 1 1 8

(1) Conversion rate depends on which channels are enabled.

compensation configuration is set to '0111' or the
sensor is diode-connected (base shorted to collector),
the η -factor used by the TMP441/42 is 1.008. When
the beta compensation configuration is set to '1xxx'
(beta compensation enabled) and the sensor is GND
collector-connected (PNP collector to ground), the
η -factor used by the TMP441/42 is 1.000. Table 8
shows the read values for the selected beta ranges
and the appropriate η -Factor used for each
conversion.

AVERAGE IQ(TYP) ( µ A),

VS= 5.5V

(1)

634 652

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Table 8. Beta Compensation Configuration Register

BCx3-BCx0 BETA RANGE DESCRIPTION N TIME

1000 Automatically selected range 0 (0.10 < beta < 0.18) 1.000 126ms
1001 Automatically selected range 1 (0.16 < beta < 0.26) 1.000 126ms
1010 Automatically selected range 2 (0.24 < beta < 0.43) 1.000 126ms
1011 Automatically selected range 3 (0.35 < beta < 0.78) 1.000 126ms
1100 Automatically selected range 4 (0.64 < beta < 1.8) 1.000 126ms
1101 Automatically selected range 5 (1.4 < beta < 9.0) 1.000 126ms
1110 Automatically selected range 6 (6.7 < beta < 40.0) 1.000 126ms
1111 Automatically selected range 7 (beta > 27.0) 1.000 126ms
1111 Automatically detected diode connected sensor 1.008 93ms
0000 Manually selected range 0 (0.10 < beta < 0.5) 1.000 93ms
0001 Manually selected range 1 (0.13 < beta < 1.0) 1.000 93ms
0010 Manually selected range 2 (0.18 < beta < 2.0) 1.000 93ms
0011 Manually selected range 3 (0.3 < beta < 25) 1.000 93ms
0100 Manually selected range 4 (0.5 < beta < 50) 1.000 93ms
0101 Manually selected range 5 (1.1 < beta < 100) 1.000 93ms
0110 Manually selected range 6 (2.4 < beta < 150) 1.000 93ms
0111 Manually disabled beta correction 1.008 93ms

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hkT

q

V =-

BE2 BE1

V

ln

I

2

I

1

()

1.008 300

300 N´-

ADJUST

h

eff

=

300 1.008´

h

eff

N

ADJUST

=300 -

1.000 300

300 N´-

ADJUST

h

eff

=

300 1.000´

h

eff

N

ADJUST

=300 -

TMP441
TMP442

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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

η -FACTOR CORRECTION REGISTER

The TMP441/42 allow for a different η -factor value to
be used for converting remote channel
measurements to temperature. The remote channel
uses sequential current excitation to extract a
differential V
the temperature of the remote transistor. Equation 1
relates this voltage and temperature.

The value η in Equation 1 is a characteristic of the
particular transistor used for the remote channel.
When the beta compensation configuration is set to
'0111' (beta compensation disabled) or the sensor is
diode-connected (base shorted to collector), the
η -factor used by the TMP441/42 is 1.008. When the
beta compensation configuration is set to '1000' (beta
compensation enabled) and the sensor is GND
collector-connected (PNP collector to ground), the

η -factor used by the TMP441/42 is 1.000. If the
η -factor used for the temperature conversion does

not match the characteristic of the sensor, then
temperature offset is observed. The value in the
η -Factor Correction Register may be used to adjust
the effective η -factor according to Equation 2 and

Equation 3 for disabled beta compensation or a

diode-connected sensor. Equation 4 and Equation 5
may be used for enabled beta compensation and a
GND collector-connected sensor.

voltage measurement to determine

BE

Table 9. η -Factor Range

N

ADJUST

BINARY HEX DECIMAL = 1.008 = 1.000

0111 1111 7F 127 1.747977 1.734104
0000 1010 0A 10 1.042759 1.034482
0000 1000 08 8 1.035616 1.027397
0000 0110 06 6 1.028571 1.020408
0000 0100 04 4 1.021622 1.013513
0000 0010 02 2 1.014765 1.006711

(1)

0000 0001 01 1 1.011371 1.003344
0000 0000 00 0 1.008 1.000
1111 1111 FF – 1 1.004651 0.996677
1111 1110 FE – 2 1.001325 0.993377
1111 1100 FC – 4 0.994737 0.986842
1111 1010 FA – 6 0.988235 0.980392
1111 1000 F8 – 8 0.981818 0.974025
1111 0110 F6 – 10 0.975484 0.967741
1000 0000 80 – 128 0.706542 0.700934

η -FACTOR η -FACTOR

SOFTWARE RESET

The TMP441/42 may be reset by writing any value to
the Software Reset Register (pointer address FCh).
This action restores the power-on reset state to all of
the TMP441/42 registers as well as aborts any
conversion in process. The TMP441/42 also support
reset via the Two-Wire general call address (0000

0000). The TMP441/42 acknowledge the general call
address and respond to the second byte. If the
second byte is 0000 0110, the TMP441/42 execute a
software reset. The TMP441/42 do not respond to

(2)

other values in the second byte.

(3)

IDENTIFICATION REGISTERS

The TMP441/42 allow for the Two-Wire bus controller

(4)

to query the device for manufacturer and device IDs
to enable software identification of the device at the
particular Two-Wire bus address. The manufacturer

(5)

The η -correction value must be stored in twos
complement format, yielding an effective data range
from – 128 to +127. Table 9 shows the η -factor range
for both 1.008 and 1.000. The η -correction value may
be written to and read from pointer address 21h. (The

ID is obtained by reading from pointer address FEh.
The device ID is obtained by reading from pointer
address FFh. The TMP441/42 both return 55h for the
manufacturer code. The TMP441 returns 41h for the
device ID and the TMP442 returns 42h for the device
ID. These registers are read-only.

η -correction value for the second remote channel is
read to/written from pointer address 22h.) The
register power-on reset value is 00h, thus having no
effect unless the register is written to.

space

space

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TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

BUS OVERVIEW

The TMP441/42 are SMBus interface-compatible. In
SMBus protocol, the device that initiates the transfer
is called a master, and the devices controlled by the

Table 10. TMP441 Slave Address Options

TWO-WIRE SLAVE

ADDRESS A1 A0

0011 100 Float 0

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master are slaves. The bus must be controlled by a 0011 101 Float 1
master device that generates the serial clock (SCL),
controls the bus access, and generates the START
and STOP conditions.

To address a specific device, a START condition is
initiated. START is indicated by pulling the data line
(SDA) from a high-to-low logic level while SCL is
high. All slaves on the bus shift in the slave address
byte, with the last bit indicating whether a read or

0011 110 0 Float
0011 111 1 Float
0101 010 Float Float
1001 100 0 0
1001 101 0 1
1001 110 1 0
1001 111 1 1

write operation is intended. During the ninth clock
pulse, the slave being addressed responds to the
master by generating an Acknowledge and pulling
SDA low.

The TMP442 has a factory-preset slave address. The
TMP442A slave address is 1001100b, and the
TMP442B slave address is 1001101b. The
configuration of the DXP and DXN channels are

Data transfer is then initiated and sent over eight
clock pulses followed by an Acknowledge bit. During

independent of the address. Unused DXP channels
can be left open or tied to GND.

data transfer SDA must remain stable while SCL is
high, because any change in SDA while SCL is high

READ/WRITE OPERATIONS

is interpreted as a control signal.

Accessing a particular register on the TMP441/42 is

Once all data have been transferred, the master
generates a STOP condition. STOP is indicated by
pulling SDA from low to high, while SCL is high.

accomplished by writing the appropriate value to the
Pointer Register. The value for the Pointer Register is
the first byte transferred after the slave address byte
with the R/ W bit low. Every write operation to the

SERIAL INTERFACE

The TMP441/42 operate only as a slave device on
either the Two-Wire bus or the SMBus. Connections
to either bus are made via the open-drain I/O lines,
SDA and SCL. The SDA and SCL pins feature
integrated spike suppression filters and Schmitt
triggers to minimize the effects of input spikes and
bus noise. The TMP441/42 support the transmission
protocol for fast (1kHz to 400kHz) and high-speed
(1kHz to 3.4MHz) modes. All data bytes are
transmitted MSB first.

TMP441/42 requires a value for the Pointer Register
(see Figure 16 ).

When reading from the TMP441/42, the last value
stored in the Pointer Register by a write operation is
used to determine which register is read by a read
operation. To change the register pointer for a read
operation, a new value must be written to the Pointer
Register. This transaction is accomplished by issuing
a slave address byte with the R/ W bit low, followed
by the Pointer Register byte; no additional data are
required. The master can then generate a START
condition and send the slave address byte with the

SERIAL BUS ADDRESS

To communicate with the TMP441/42, the master
must first address slave devices via a slave address
byte. The slave address byte consists of seven
address bits, and a direction bit indicating the intent
of executing a read or write operation.

TWO-WIRE INTERFACE SLAVE DEVICE

R/ W bit high to initiate the read command. See

Figure 18 for details of this sequence. If repeated

reads from the same register are desired, it is not
necessary to continually send the Pointer Register
bytes, because the TMP441/42 retain the Pointer
Register value until it is changed by the next write
operation. Note that register bytes are sent MSB first,
followed by the LSB.

ADDRESSES Read operations should be terminated by issuing a

The TMP441 supports nine slave device addresses.
The TMP442A and TMP442B are available in two
different fixed serial interface addresses.

The slave device address for the TMP441 is set by
the A1 and A0 pins, as summarized in Table 10 .

Not-Acknowledge command at the end of the last
byte to be read. For a single-byte operation, the
master should leave the SDA line high during the
Acknowledge time of the first byte that is read from
the slave. For a two-byte read operation, the master
must pull SDA low during the Acknowledge time of
the first byte read, and should leave SDA high during
the Acknowledge time of the second byte read from
the slave.

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SCL

SDA

t

(LOW)

t

R

t

F

t

(HDSTA)

t

(HDSTA)

t

(HDDAT)

t

(BUF)

t

(SUDAT)

t

(HIGH)

t

(SUSTA)

t

(SUSTO)

P S S P

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TMP442

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TIMING DIAGRAMS

The TMP441/42 are Two-Wire and
SMBus-compatible. Figure 15 to Figure 18 describe
the various operations on the TMP441/42.

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

Data Transfer: The number of data bytes transferred
between a START and a STOP condition is not
limited and is determined by the master device. The
receiver acknowledges data transfer.

Parameters for Figure 15 are defined in Table 11 . Acknowledge: Each receiving device, when
Bus definitions are: addressed, is obliged to generate an Acknowledge

Bus Idle: Both SDA and SCL lines remain high.
Start Data Transfer: A change in the state of the

SDA line, from high to low, while the SCL line is high,
defines a START condition. Each data transfer is
initiated with a START condition.

Stop Data Transfer: A change in the state of the
SDA line from low to high while the SCL line is high

bit. A device that acknowledges must pull down the
SDA line during the Acknowledge clock pulse in such
a way that the SDA line is stable low during the high
period of the Acknowledge clock pulse. Setup and
hold times must be taken into account. On a master
receive, data transfer termination can be signaled by
the master generating a Not-Acknowledge on the last
byte that has been transmitted by the slave.

defines a STOP condition. Each data transfer
terminates with a repeated START or STOP
condition.

Figure 15. Two-Wire Timing Diagram

Table 11. Timing Characteristics for Figure 15

PARAMETER MIN MAX MIN MAX UNIT

SCL operating frequency f
Bus free time between STOP and START conditions t
Hold time after repeated START condition. After this period, the first clock

is generated.
Repeated START condition setup time t
STOP condition setup time t
Data hold time t
Data setup time t
SCL clock LOW period t
SCL clock HIGH period t
Clock/Data fall time t
Clock/Data rise time t

for SCL ≤ 100kHz t

t

(HDSTA)

(SUSTA)
(SUSTO)
(HDDAT)
(SUDAT)

(HIGH)

FAST MODE HIGH-SPEED MODE

0.001 0.4 0.001 3.4 MHz

(SCL)
(BUF)

(LOW)

600 160 ns
100 100 ns
100 100 ns

100 100 ns

0 0 ns

100 10 ns

1300 160 ns

600 60 ns

F
R
R

300 160 ns
300 160 ns

1000 ns

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 17

Product Folder Link(s): TMP441 TMP442

Frame1Two-WireSlaveAddressByte

Frame2PointerRegisterByte

Frame4DataByte2

1

StartBy

Master

ACKBy

TMP441/42

ACKBy

TMP441/42

ACKBy

TMP441/42

StopBy

Master

1 9 1

1

D7 D6 D5 D4 D3 D2 D1 D0

9

Frame3DataByte1

ACKBy

TMP441/42

1

D7

SDA

(Continued)

SCL

(Continued)

D6 D5 D4 D3 D2 D1 D0

9

9

SDA

SCL

0 0 1 1 0 0

(1)

R/W P7 P6 P5 P4 P3 P2 P1 P0

¼

¼

NOTE:(1)Slaveaddress1001100shown.

Frame1Two-WireSlaveAddressByte Frame2PointerRegisterByte

1

StartBy

Master

ACKBy

TMP441/42

ACKBy

TMP441/42

Frame3Two-WireSlaveAddressByte Frame4DataByte1ReadRegister

StartBy

Master

ACKBy

TMP441/42

NACKBy

Master

(2)

From

TMP441/42

1 9 1

9

1 9 1

9

SDA

SCL

0 0 1 R/

W P7 P6 P5 P4 P3 P2 P1 P0

¼

¼

¼

¼

SDA

(Continued)

SCL

(Continued)

1 0 0 1

1 0 0

(1)

1 0 0

(1)

R/W D7 D6 D5 D4 D3 D2 D1 D0

(1)Slaveaddress1001100shown.
(2)MastershouldleaveSDAhightoterminateasingle-bytereadoperation.

NOTES:

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

www.ti.com

Figure 16. Two-Wire Timing Diagram for Write Word Format

18 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated

Figure 17. Two-Wire Timing Diagram for Single-Byte Read Format

Product Folder Link(s): TMP441 TMP442

Frame1Two-WireSlaveAddressByte Frame2PointerRegisterByte

1

StartBy

Master

ACKBy

TMP441/42

ACKBy

TMP441/42

Frame3Two-WireSlaveAddressByte Frame4DataByte1ReadRegister

StartBy

Master

ACKBy

TMP441/42

ACKBy

Master

From

TMP441/42

1 9 1

9

1 9 1

9

SDA

SCL

0 0 1 R/

W P7 P6 P5 P4 P3 P2 P1 P0

¼

¼

¼

¼

SDA

(Continued)

SCL

(Continued)

SDA

(Continued)

SCL

(Continued)

1 0 0 1

1 0 0

(1)

1 0 0

(1)

R/W D7 D6 D5 D4 D3 D2 D1 D0

Frame5DataByte2ReadRegister

StopBy

Master

NACKBy

Master

(2)

From

TMP441/42

1

9

D7 D6 D5 D4 D3 D2 D1 D0

(1)Slaveaddress1001100shown.
(2)MastershouldleaveSDAhightoterminateatwo-bytereadoperation.

NOTES:

TMP441
TMP442

www.ti.com

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

Figure 18. Two-Wire Timing Diagram for Two-Byte Read Format

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 19

Product Folder Link(s): TMP441 TMP442

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

HIGH-SPEED MODE

In order for the Two-Wire bus to operate at
frequencies above 400kHz, the master device must
issue a High-Speed mode (Hs-mode) master code
(0000 1xxx) as the first byte after a START condition
to switch the bus to high-speed operation. The
TMP441/42 acknowledge this byte, but switch the
input filters on SDA and SCL and the output filter on
SDA to operate in Hs-mode, allowing transfers at up
to 3.4MHz. After the Hs-mode master code has been
issued, the master transmits a Two-Wire slave
address to initiate a data transfer operation. The bus
continues to operate in Hs-mode until a STOP
condition occurs on the bus. Upon receiving the
STOP condition, the TMP441/42 switch the input and
output filters back to fast mode operation.

TIMEOUT FUNCTION

The TMP441/42 reset the serial interface if either
SCL or SDA are held low for 32ms (typical) between
a START and STOP condition. If the TMP441/42 are
holding the bus low, they release the bus and waits
for a START condition. To avoid activating the
timeout function, it is necessary to maintain a
communication speed of at least 1kHz for the SCL
operating frequency.

SHUTDOWN MODE (SD)

The TMP441/42 Shutdown Mode allows maximum
power to be saved by shutting down all device
circuitry other than the serial interface, reducing
current consumption to typically less than 3 µ A; see

Figure 6 , Shutdown Quiescent Current vs Supply

Voltage. Shutdown Mode is enabled when the SD bit
of the Configuration Register is high; the device shuts
down once the current conversion is completed.
When SD is low, the device maintains a continuous
conversion state.

SENSOR FAULT

The TMP441/42 can sense a fault at the DXP input
resulting from incorrect diode connection and can
sense an open circuit. Short-circuit conditions return a
value of – 64 ° C. The detection circuitry consists of a
voltage comparator that trips when the voltage at
DXP exceeds (V+) – 0.6V (typical). The comparator
output is continuously checked during a conversion. If
a fault is detected, the OPEN bit (bit 0) in the
temperature result register is set to '1' and the rest of
the register bits should be ignored.

www.ti.com

When not using the remote sensor with the
TMP441/42, the DXP and DXN inputs must be
connected together to prevent meaningless fault
warnings.

UNDERVOLTAGE LOCKOUT

The TMP441/42 sense when the power-supply
voltage has reached a minimum voltage level for the
ADC to function. The detection circuitry consists of a
voltage comparator that enables the ADC after the
power supply (V+) exceeds 2.45V (typical). The
comparator output is continuously checked during a
conversion. The TMP441/42 do not perform a
temperature conversion if the power supply is not
valid. The PVLD bit (bit 1, see Table 3 ) of the
Local/Remote Temperature Register is set to '1' and
the temperature result may be incorrect.

GENERAL CALL RESET

The TMP441/42 support reset via the Two-Wire
General Call address 00h (0000 0000b). The
TMP441/42 acknowledge the General Call address
and respond to the second byte. If the second byte is
06h (0000 0110b), the TMP441/42 execute a
software reset. This software reset restores the
power-on reset state to all TMP441/42 registers, and
aborts any conversion in progress. The TMP441/42
take no action in response to other values in the
second byte.

FILTERING

Remote junction temperature sensors are usually
implemented in a noisy environment. Noise is
frequently generated by fast digital signals and if not
filtered properly will induce errors that can corrupt
temperature measurements. The TMP441/42 have a
built-in 65kHz filter on the inputs of DXP and DXN to
minimize the effects of noise. However, a differential
low-pass filter can help attenuate unwanted coupled
signals. If filtering is needed, suggested component
values are 100pF and 50 Ω on each input; exact
values are application-specific. It is also
recommended that the capacitor value remains
between 0pF to 330pF with a series resistance less
than 1k Ω .

20 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated

Product Folder Link(s): TMP441 TMP442

h - 1.008

1.008

T =

err

()

´ (273.15+T( C))°

T

ERR

+

ǒ

1.004* 1.008

1.008

Ǔ

ǒ

273.15) 100°C

Ǔ

T

ERR

+ 1.48°C

TMP441
TMP442

www.ti.com

REMOTE SENSING

The TMP441/42 are designed to be used with either
discrete transistors or substrate transistors built into 4. Tight control of V
processor chips and ASICs. Either NPN- or PNP-type small variations in h
transistors can be used, as long as the base-emitter
junction is used as the remote temperature sense.
NPN transistors must be diode-connected. PNP
transistors can either be transistor- or
diode-connected (see Figure 12 ).

Errors in remote temperature sensor readings are
typically the consequence of the ideality factor and
current excitation used by the TMP441/42 versus the
manufacturer-specified operating current for a given
transistor. Some manufacturers specify a high-level
and low-level current for the temperature-sensing
substrate transistors. The TMP441/42 use 6 µ A for
I

LOW

different η -factor values; see the η -Factor Correction

Register section. The ideality factor ( η ) is a measured

characteristic of a remote temperature sensor diode
as compared to an ideal diode.

The ideality factor for the TMP441/42 is trimmed to
be 1.008. For transistors that have an ideality factor
that does not match the TMP441/42, Equation 6 can
be used to calculate the temperature error. Note that
for the equation to be used correctly, actual
temperature ( ° C) must be converted to kelvins (K).

Where:

For η = 1.004 and T( ° C) = 100 ° C:

If a discrete transistor is used as the remote
temperature sensor with the TMP441/42, the best
accuracy can be achieved by selecting the transistor
according to the following criteria:

1. Base-emitter voltage > 0.25V at 6 µ A, at the

2. Base-emitter voltage < 0.95V at 120 µ A, at the

.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009

lowest sensed temperature.

3. Base resistance < 100 Ω .

Based on these criteria, two recommended
small-signal transistors are the 2N3904 (NPN) or
2N3906 (PNP).

MEASUREMENT ACCURACY AND THERMAL CONSIDERATIONS

The temperature measurement accuracy of the
TMP441/42 depends on the remote and/or local
temperature sensor being at the same temperature
as the system point being monitored. Clearly, if the
temperature sensor is not in good thermal contact

and 120 µ A for I

η = ideality factor of remote temperature sensor
T( ° C) = actual temperature
T

= error in TMP441/42 due to n ≠ 1.008

ERR

Degree delta is the same for ° C and K

highest sensed temperature.

. The TMP441/42 allow for

HIGH

(6)

(7)

with the part of the system being monitored, then
there will be a delay in the response of the sensor to
a temperature change in the system. For remote
temperature-sensing applications that use a substrate
transistor (or a small, SOT23 transistor) placed close
to the device being monitored, this delay is usually
not a concern.

The local temperature sensor inside the TMP441/42
monitors the ambient air around the device. The
thermal time constant for the TMP441/42 is
approximately two seconds. This constant implies
that if the ambient air changes quickly by 100 ° C, it
would take the TMP441/42 approximately 10 seconds
(that is, five thermal time constants) to settle to within
1 ° C of the final value. In most applications, the
TMP441/42 package is in electrical, and therefore
thermal, contact with the printed circuit board (PCB),
as well as subjected to forced airflow. The accuracy
of the measured temperature directly depends on
how accurately the PCB and forced airflow
temperatures represent the temperature that the
TMP441/42 is measuring. Additionally, the internal
power dissipation of the TMP441/42 can cause the
temperature to rise above the ambient or PCB
temperature. The internal power dissipated as a
result of exciting the remote temperature sensor is
negligible because of the small currents used. For a

5.5V supply and maximum conversion rate of eight
conversions per second, the TMP441/42 dissipate

5.2mW (PD
causes the junction temperature to rise approximately
+0.23 ° C above the ambient.

= 5.5V × 950 µ A). A θ

IQ

characteristics indicated by

BE

(that is, 50 to 150).

FE

JA

of 100 ° C/W

Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 21

Product Folder Link(s): TMP441 TMP442

V+

DXP

DXN

GND

NOTE:Useminimum5miltraceswith5milspacing.

GroundorV+layer
onbottomand/or
top,ifpossible.

1

2

3

4

8

7

6

5

TMP441

0.1mFCapacitor

V+

GND

PCBVia

DXP

DXN

A1

A0

1

2

3

4

8

7

6

5

TMP442

0.1mFCapacitor

V+

GND

PCBVia

DXP1

DXN1

DXP2

DXN2

TMP441
TMP442

SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................

LAYOUT CONSIDERATIONS

Remote temperature sensing on the TMP441/42
measures very small voltages using very low
currents; therefore, noise at the IC inputs must be
minimized. Most applications using the TMP441/42
will have high digital content, with several clocks and
logic level transitions creating a noisy environment.
Layout should adhere to the following guidelines:

1. Place the TMP441/42 as close to the remote
junction sensor as possible.

2. Route the DXP and DXN traces next to each
other and shield them from adjacent signals
through the use of ground guard traces, as
shown in Figure 19 . If a multilayer PCB is used,
bury these traces between ground or V
to shield them from extrinsic noise sources. 5 mil
(0.005 in, or 0,127 mm) PCB traces are
recommended.

3. Minimize additional thermocouple junctions
caused by copper-to-solder connections. If these
junctions are used, make the same number and
approximate locations of copper-to-solder
connections in both the DXP and DXN
connections to cancel any thermocouple effects.

4. Use a 0.1 µ F local bypass capacitor directly
between the V+ and GND of the TMP441/42, as
shown in Figure 20 . Minimize filter capacitance
between DXP and DXN to 330pF or less for
optimum measurement performance. This
capacitance includes any cable capacitance
between the remote temperature sensor and
TMP441/42.

5. If the connection between the remote
temperature sensor and the TMP441/42 is less
than 8 in (20,32 cm) long, use a twisted-wire pair
connection. Beyond 8 in, use a twisted, shielded
pair with the shield grounded as close to the
TMP441/42 as possible. Leave the remote sensor
connection end of the shield wire open to avoid
ground loops and 60Hz pickup.

6. Thoroughly clean and remove all flux residue in
and around the pins of the TMP441/42 to avoid
temperature offset readings as a result of leakage
paths between DXP or DXN and GND, or
between DXP or DXN and V+.

planes

DD

www.ti.com

Figure 19. Suggested PCB Layer Cross-Section

22 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated

Figure 20. Suggested Bypass Capacitor

Placement and Trace Shielding

Product Folder Link(s): TMP441 TMP442

PACKAGE OPTION ADDENDUM

www.ti.com 30-Mar-2009

PACKAGING INFORMATION

Orderable Device Status

(1)

Package

Type

Package
Drawing

Pins Package

Qty

Eco Plan

TMP441AIDCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &

(2)

Lead/Ball Finish MSL Peak Temp

CU NIPDAU Level-2-260C-1 YEAR

(3)

no Sb/Br)

TMP441AIDCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &

CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

TMP442ADCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &

CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

TMP442ADCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &

CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

TMP442BDCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &

CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

TMP442BDCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &

CU NIPDAU Level-2-260C-1 YEAR

no Sb/Br)

(1)

The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.

Addendum-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com 27-Mar-2009

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

TMP441AIDCNR SOT-23 DCN 8 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TMP441AIDCNT SOT-23 DCN 8 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3

TMP442ADCNR SOT-23 DCN 8 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TMP442ADCNT SOT-23 DCN 8 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TMP442BDCNR SOT-23 DCN 8 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TMP442BDCNT SOT-23 DCN 8 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3

Type

Package
Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0 (mm) B0 (mm) K0 (mm) P1

(mm)W(mm)

Pin1

Quadrant

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com 27-Mar-2009

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

TMP441AIDCNR SOT-23 DCN 8 3000 195.0 200.0 45.0

TMP441AIDCNT SOT-23 DCN 8 250 195.0 200.0 45.0
TMP442ADCNR SOT-23 DCN 8 3000 195.0 200.0 45.0
TMP442ADCNT SOT-23 DCN 8 250 195.0 200.0 45.0
TMP442BDCNR SOT-23 DCN 8 3000 195.0 200.0 45.0
TMP442BDCNT SOT-23 DCN 8 250 195.0 200.0 45.0

Pack Materials-Page 2

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