TEXAS INSTRUMENTS TMP441, TMP442 Technical data
TMP441 TMP442
+5V
1ChannelLocal
1ChannelRemote
1ChannelLocal
2ChannelsRemote
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
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.............................................................................................................................................. 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)
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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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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
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TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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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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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
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.............................................................................................................................................. 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
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3
2
1
0
1
2
3
-
-
-
RemoteTemperatureError( C)°
-50 -25 0 25 50
75
100 125
AmbientTemperature,T (
A
C)°
BetaCompensationDisabled.
GNDCollector-ConnectedTransistorwithn-Factor=1.008.
3
2
1
0
1
2
3
-
-
-
LocalTemperatureError( C)
°
-50 -25 0 25 50
75
100 125
AmbientTemperature,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
ConversionRate(conversions/s)
TMP441
TMP442
V =5.5V
S
150
100
50
0
50
100--
-150
RemoteTemperatureError(
C)
°
0 5 10 15 20 3025
LeakageResistance(M )W
R
GND
(LowBeta)
R
Vs
RVs(LowBeta)
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
SCLClockFrequency(Hz)
V =3.3V
S
V =5.5V
S
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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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-
-
-
-
-
RemoteTemperatureError( C)
°
0 100 200 300 400 500
R ( )W
S
3
2
1
0
1
2
3
-
-
-
RemoteTemperatureError( C)
°
0 100 200 300 400 500 600 700 800 900
1k
R ( )W
S
Diode-ConnectedTransistor,2N3906(PNP)
(2)
GNDCollector-ConnectedTransistor,2N3906(PNP)
(1)(2)
NOTES(1):Temperatureoffsetistheresultof
-factorbeingautomaticallysetto1.000.
Approximate -factorof2N3906is1.008.
h
h
SeeFigure10forschematicconfiguration.(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
-
-
-
-
-
-
RemoteTemperatureError(
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-BetaTransistor(Disabled)
Low-BetaTransistor
(Auto)
GNDCollector-ConnectedTransistor(Disabled)
GNDCollector-ConnectedTransistor(Auto)
Diode-ConnectedTransistor(Auto,Disabled)
NOTE:SeeFigure11forschematicconfiguration.
(b) Diode-ConnectedTransistor
(a) GNDCollector-ConnectedTransistor
DXP
DXN
C
DIFF
(1)
DXP
DXN
C
DIFF
(1)
(b) Diode-ConnectedTransistor
(a) GNDCollector-ConnectedTransistor
DXP
DXN
R
S
(1)
R
S
(1)
DXP
DXN
R
S
(1)
R
S
(1)
TMP441
TMP442
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.............................................................................................................................................. 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-connectedtransistorconfiguration :
(1)
SeriesResistance
GNDcollector-connectedtransistorconfiguration:
(1)
(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.
GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.
(2)R shouldbe<1kW inmostapplications.SelectionofR dependsonapplication;seethe section.Filtering
S
S
(3)C shouldbe<500pFinmostapplications.SelectionofC dependsonapplication;
DIFF
DIFF
NOTES:
A1
A0
4
3
seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.
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-connectedtransistorconfiguration :
(1)
SeriesResistance
GNDcollector-connectedtransistorconfiguration:
(1)
(1)Diode-connectedtransistorconfigurationprovidesbettersettlingtime.
GNDcollector-connectedtransistorconfigurationprovidesbetterseriesresistancecancellation.
(2)R shouldbe<1kW inmostapplications. SelectionofR dependsonapplication;seethe section.
SelectionofC dependsonapplication;
Filtering
(3)C shouldbe<500pFinmostapplications.
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
seethe sectionandFigure9,Filtering RemoteTemperatureErrorvsDifferentialCapacitance.
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.
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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
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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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