1
FEATURES DESCRIPTION
APPLICATIONS
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
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
± 1 ° C TEMPERATURE SENSORwith Automatic Beta Compensation,Series-R, and η-Factor in a SOT23-8
234
•SOT23-8 PACKAGE
The TMP441 and TMP442 are remote temperaturemonitors with a built-in local temperature sensor.•± 1 ° C REMOTE DIODE SENSOR (MAX)
Remote temperature sensor diode-connected•± 1 ° C LOCAL TEMPERATURE SENSOR (MAX)
transistors are typically low-cost, NPN- or PNP-type•AUTOMATIC BETA COMPENSATION
transistors or diodes that are an integral part of•SERIES RESISTANCE CANCELLATION microcontrollers, microprocessors, orfield-programmable gate arrays (FPGAs).• η -FACTOR CORRECTION
Remote accuracy is ± 1 ° C for multiple IC•TWO-WIRE/ SMBus™ SERIAL INTERFACE
manufacturers, with no calibration needed. The•MULTIPLE INTERFACE ADDRESSES
Two-Wire serial interface accepts SMBus write byte,•DIODE FAULT DETECTION
read byte, send byte, and receive byte commands to•RoHS-COMPLIANT AND NO Sb/Br configure the device.•TRANSISTOR AND DIODE MODEL
The TMP441 has a single remote temperatureOPERATION
monitor with address pins. The TMP442 has dualremote temperature monitors, and is available withtwo different interface addresses. All versions includeautomatic beta compensation (correction), series•PROCESSOR/FPGA TEMPERATURE
resistance cancellation, programmable non-idealityMONITORING
factor ( η-factor), wide remote temperature•LCD/ DLP
®
/LCOS PROJECTORS
measurement range (up to +150 ° C), and diode fault•SERVERS
detection.•CENTRAL OFFICE TELECOM EQUIPMENT
The TMP441 and TMP442 are both available in an•STORAGE AREA NETWORKS (SAN)
8-lead, SOT23 package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2DLP is a registered trademark of Texas Instruments.3SMBus is a trademark of Intel Corporation.4All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008 – 2009, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
ABSOLUTE MAXIMUM RATINGS
(1)
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled withappropriate 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 moresusceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE INFORMATION
(1)
TWO-WIRE PACKAGE PACKAGEPRODUCT DESCRIPTION ADDRESS PACKAGE-LEAD DESIGNATOR MARKING
Single-ChannelTMP441 Remote Junction 100 11xx SOT23-8 DCN DIGITemperature SensorTMP442A Dual-Channel 100 1100 SOT23-8 DCN DIHIRemote JunctionTMP442B 100 1101 SOT23-8 DCN DIJITemperature Sensor
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TIweb site at www.ti.com .
Over operating free-air temperature range, unless otherwise noted.
PARAMETER TMP441, TMP442 UNIT
Power Supply V
S
+7 VPins 1, 2, 3, and 4 only – 0.5 to V
S
+ 0.5 VInput Voltage
Pins 6 and 7 only – 0.5 to 7 VInput Current 10 mAOperating Temperature Range – 55 to +127 ° CStorage Temperature Range – 60 to +130 ° CJunction Temperature T
J
max +150 ° CHuman Body Model HBM 3000 VESD Rating Charged Device Model CDM 1000 VMachine Model MM 200 V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods maydegrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyondthose specified is not implied.
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ELECTRICAL CHARACTERISTICS
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
At T
A
= – 40 ° C to +125 ° C and V
S
= 2.7V to 5.5V, unless otherwise noted.
TMP441, TMP442
PARAMETER CONDITIONS MIN TYP MAX UNIT
TEMPERATURE ERROR
Local Temperature Sensor TE
LOCAL
T
A
= – 40 ° C to +125 ° C ± 1.25 ± 2.5 ° C
T
A
= 0 ° C to +100 ° C, V
S
= 3.3V ± 0.25 ± 1 ° C
Remote Temperature Sensor
(1)
TE
REMOTE
T
A
= 0 ° C to +100 ° C, T
DIODE
= – 40 ° C to +150 ° C, V
S
= 3.3V ± 0.25 ± 1 ° C
T
A
= – 40 ° C to +100 ° C, T
DIODE
= – 40 ° C to +150 ° C, V
S
= 3.3V ± 0.5 ± 1.5 ° C
T
A
= – 40 ° C to +125 ° C, T
DIODE
= – 40 ° C to +150 ° C ± 3 ± 5 ° C
vs Supply (Local/Remote) V
S
= 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
(2)
RC = 1 97 126 137 ms
RC = 0 36 47 52 ms
MBeta Correction Disabled
(3)
RC = 1 72 93 100 ms
RC = 0 33 44 47 ms
Resolution
Local Temperature Sensor 12 Bits
Remote Temperature Sensor 12 Bits
Remote Sensor Source Currents
High Series resistance (beta correction)
(4)
120 µA
Medium High 60 µA
Medium Low 12 µA
Low 6 µA
Remote Transistor Ideality Factor ηTMP441/TMP442 optimized ideality factor 1.000
(2)
1.008
(3)
Beta Correction Range β0.1 27
SMBus INTERFACE
Logic Input High Voltage (SCL, SDA) V
IH
2.1 V
Logic Input Low Voltage (SCL, SDA) V
IL
0.8 V
Hysteresis 500 mV
SMBus Output Low Sink Current 6 mA
SDA Output Low Voltage V
OL
I
OUT
= 6mA 0.15 0.4 V
Logic Input Current 0 ≤V
IN
≤6V – 1 +1 µA
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 µs
DIGITAL INPUTS
Input Capacitance 3 pF
Input Logic Levels
Input High Voltage V
IH
0.7(V+) (V+)+0.5 V
Input Low Voltage V
IL
– 0.5 0.3(V+) V
Leakage Input Current I
IN
0V ≤V
IN
≤V
S
1µA
(1) Tested with less than 5 Ωeffective series resistance, 100pF differential input capacitance, and an ideal diode with η-factor = 1.008. T
A
isthe ambient temperature of the TMP441/42. T
DIODE
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 Ωof series line resistance is cancelled; if beta correction is enabled ( ' 1xxx ' ), up to300 Ωis cancelled.
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 T
A
= – 40 ° C to +125 ° C and V
S
= 2.7V to 5.5V, unless otherwise noted.
TMP441, TMP442
PARAMETER CONDITIONS MIN TYP MAX UNIT
POWER SUPPLY
Specified Voltage Range V
S
2.7 5.5 V
Quiescent Current I
Q
0.0625 conversions per second 35 45 µA
Eight conversions per second
(5)
0.7 1 mA
Serial Bus inactive, Shutdown Mode 3 10 µA
Serial Bus active, f
S
= 400kHz, Shutdown Mode 90 µA
Serial Bus active, f
S
= 3.4MHz, Shutdown Mode 350 µA
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
JA
170 ° C/W
(5) Beta correction disabled.
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TMP441 PIN CONFIGURATION
1
2
3
4
8
7
6
5
V+
SCL
GND
DXP
DXN
A1
A0
SDA
TMP441
TMP442 PIN CONFIGURATION
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
DCN PACKAGE
SOT23-8
(TOP VIEW)
TMP441 PIN ASSIGNMENTSTMP441
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)
DCN PACKAGE
SOT23-8
(TOP VIEW)
TMP442 PIN ASSIGNMENTSTMP442
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)
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TYPICAL CHARACTERISTICS
3
2
1
0
1
2
3
-
-
-
RemoteTemperatureError( C)°
-50 -25 0 25 50 75 100 125
AmbientTemperature,T (
AC)°
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 (
AC)°
700
600
500
400
300
200
100
0
I ( A)
m
Q
0.0625 0.125 0.25 0.5 1 2 48
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
RGND (LowBeta)
RVs
RVs (LowBeta)
RGND
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 ..............................................................................................................................................
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At T
A
= +25 ° C and V
S
= +3.3V, unless otherwise noted.
REMOTE TEMPERATURE ERROR LOCAL TEMPERATURE ERRORvs TEMPERATURE vs TEMPERATURE
Figure 1. Figure 2.
REMOTE TEMPERATURE ERROR QUIESCENT CURRENTvs LEAKAGE RESISTANCE vs CONVERSION RATE
Figure 3. Figure 4.
SHUTDOWN QUIESCENT CURRENT SHUTDOWN QUIESCENT CURRENTvs SCL CLOCK FREQUENCY vs SUPPLY VOLTAGE
Figure 5. Figure 6.
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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
CDIFF
(1)
DXP
DXN
CDIFF
(1)
(b) Diode-ConnectedTransistor
(a) GNDCollector-ConnectedTransistor
DXP
DXN
RS
(1)
RS
(1)
DXP
DXN
RS
(1)
RS
(1)
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
TYPICAL CHARACTERISTICS (continued)At T
A
= +25 ° C and V
S
= +3.3V, unless otherwise noted.
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCEREMOTE TEMPERATURE ERROR vs SERIES RESISTANCE (Low-Beta Transistor)
Figure 7. Figure 8.
REMOTE TEMPERATURE ERRORvs DIFFERENTIAL CAPACITANCE
Figure 9.
SERIES RESISTANCE CONFIGURATION DIFFERENTIAL CAPACITANCE CONFIGURATION
(1) R
S
should be less than 1k Ω; see Filtering (1) C
DIFF
should be less than 300pF; see Filteringsection. section.Figure 10. Figure 11.
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APPLICATION INFORMATION
0.1 Fm10kW
(typ)
10kW
(typ)
TMP441
DXP
DXN
V+
8
7
6
5
2
1
RS
(2)
RS
(2) CDIFF
(3)
CDIFF
(3)
RS
(2)
RS
(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<1kWinmostapplications.SelectionofR dependsonapplication;seethe section.Filtering
SS
(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
RS
(2)
RS
(2) CDIFF
(3)
CDIFF
(3)
RS
(2)
RS
(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<1kWin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.
SS
DIFF
DIFF
NOTES:
DXP2
DXN2
4
3
RS
(2)
RS
(2) CDIFF
(3)
0.1 Fm10kW
(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 ..............................................................................................................................................
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For proper remote temperature sensing operation, theThe TMP441/42 are digital temperature sensors that
TMP441 requires only a transistor connectedcombine a local die temperature measurement
between DXP and DXN; the TMP442 requireschannel and one (TMP441) or two (TMP442) remote
transistors connected between DXP1 and DXN1 andjunction temperature measurement channels in a
between DXP2 and DXN2. The SCL and SDAsingle SOT23-8 package. The TMP441/42 are
interface pins require pull-up resistors as part of theTwo-Wire- and SMBus interface-compatible and are
communication bus. A 0.1 µF power-supply bypassspecified over a temperature range of – 40 ° C to
capacitor is recommended for good local bypassing.+125 ° C. The TMP441/42 contain multiple registers
Figure 12 shows a typical configuration for thefor holding configuration information and temperature
TMP441; Figure 13 shows a typical configuration formeasurement results.
the TMP442.
Figure 12. TMP441 Basic Connections
Figure 13. TMP442 Basic Connections
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BETA COMPENSATION TEMPERATURE MEASUREMENT DATA
SERIES RESISTANCE CANCELLATION
DIFFERENTIAL INPUT CAPACITANCE
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
Previous generations of remote junction temperature Temperature measurement data are taken over asensors were operated by controlling the emitter default range of – 55 ° C to +127 ° C for both local andcurrent of the sensing transistor. However, remote locations. However, measurements fromexamination of the physics of a transistor shows that – 55 ° C to +150 ° C can be made both locally andV
BE
is actually a function of the collector current. If remotely by reconfiguring the TMP441/42 for thebeta is independent of the collector current, then V
BE
extended temperature range, as described in thismay be calculated from the emitter current. In earlier section. Temperature data resulting from conversionsgenerations of processors that contained PNP within the default measurement range aretransistors 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 temperaturetemperature 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 adecrease and the premise that it is independent of value of 127 (7Fh). The device can be set to measurecollector current becomes less certain. over an extended temperature range by changing bit2 (RANGE) of Configuration Register 1 from low toTo manage this increasing temperature measurement
high. The change in measurement range and dataerror, the TMP441/42 control the collector current
format from standard binary to extended binaryinstead of the emitter current. The TMP441/42
occurs at the next temperature conversion. For dataautomatically detect and choose the correct range
captured in the extended temperature rangedepending on the beta factor of the external
configuration, an offset of 64 (40h) is added to thetransistor. This auto-ranging is performed at the
standard binary value, as shown in the Extendedbeginning of each temperature conversion in order to
Binary column of Table 1 . This configuration allowscorrect for any changes in the beta factor as a result
measurement of temperatures as low as – 64 ° C, andof temperature variation. The device can operate a
as high as +191 ° C; however, mostPNP transistor with a beta factor as low as 0.1. See
temperature-sensing diodes only measure with thethe Beta Compensation Configuration Register
range of – 55 ° C to +150 ° C. Additionally, theSection for further information.
TMP441/42 are rated only for ambient temperaturesranging from – 40 ° C to +125 ° C. Parameters in theAbsolute Maximum Ratings table must be observed.Series resistance in an application circuit that typically
Table 1. Temperature Data Format (Local andresults from printed circuit board (PCB) trace
Remote Temperature High Bytes)resistance and remote line length (see Figure 12 ) isautomatically cancelled by the TMP441/42,
LOCAL/REMOTE TEMPERATURE REGISTERHIGH BYTE VALUE (1 ° C RESOLUTION)preventing what would otherwise result in a
STANDARD BINARY
(1)
EXTENDED BINARY
(2)temperature offset. A total of up to 1k Ωof series line
TEMPresistance is cancelled by the TMP441/42 if beta ( ° C) BINARY HEX BINARY HEXcorrection is disabled and up to 300 Ωof series line
– 64 1100 0000 C0 0000 0000 00resistance is cancelled if beta correction is enabled,
– 50 1100 1110 CE 0000 1110 0Eeliminating the need for additional characterization
– 25 1110 0111 E7 0010 0111 27and temperature offset correction. See the two
0 0000 0000 00 0100 0000 40Remote Temperature Error vs Series Resistance
1 0000 0001 01 0100 0001 41typical characteristic curves (Figure 7 and Figure 8 )
5 0000 0101 05 0100 0101 45for details on the effect of series resistance on
10 0000 1010 0A 0100 1010 4Asensed remote temperature error.
25 0001 1001 19 0101 1001 59
50 0011 0010 32 0111 0010 72
75 0100 1011 4B 1000 1011 8BThe TMP441/42 can tolerate differential input
100 0110 0100 64 1010 0100 A4capacitance of up to 500pF if beta correction is
125 0111 1101 7D 1011 1101 BDenabled, and 1000pF if beta correction is disabled
127 0111 1111 7F 1011 1111 BFwith minimal change in temperature error. The effect
150 0111 1111 7F 1101 0110 D6of capacitance on sensed remote temperature error isillustrated in Figure 9 ,Remote Temperature Error vs 175 0111 1111 7F 1110 1111 EFDifferential Capacitance. See the Filtering section for
191 0111 1111 7F 1111 1111 FFsuggested component values where filtering
(1) Resolution is 1 ° C/count. Negative numbers are represented inunwanted coupled signals is needed.
twos complement format.(2) Resolution is 1 ° C/count. All values are unsigned with a – 64 ° Coffset.
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Standard Binary to Decimal Temperature Data
Standard Decimal to Binary Temperature Data
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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Both local and remote temperature data use two
Calculation Examplebytes for data storage. The high byte stores thetemperature with 1 ° C resolution. The second or low
High byte conversion (for example, 0111 0011):byte stores the decimal fraction value of the
Convert the right-justified binary high byte totemperature and allows a higher measurement
hexadecimal.resolution, as shown in Table 2 . The measurement
From hexadecimal, multiply the first number byresolution for both the local and remote channels is
16
0
= 1 and the second number by 16
1
= 16.0.0625 ° C, and cannot be adjusted.
The sum equals the decimal equivalent.Table 2. Decimal Fraction Temperature Data
0111 0011b →73h →(3 × 16
0
) + (7 × 16
1
) = 115Format (Local and Remote Temperature Low
Low byte conversion (for example, 0111 0000):Bytes)
To convert the left-justified binary low-byte toTEMPERATURE REGISTER LOW BYTE
decimal, use bits 7 through 4 and ignore bits 3VALUE(0.0625 ° C RESOLUTION)
(1)
through 0 because they do not affect the value ofthe number.TEMP STANDARD AND EXTENDED( ° C) BINARY HEX
0111b →(0 × 1/2)
1
+ (1 × 1/2)
2
+0 0000 0000 00
(1 × 1/2)
3
+ (1 × 1/2)
4
= 0.43750.0625 0001 0000 10
Note that the final numerical result is the sum of the0.1250 0010 0000 20
high byte and low byte. In negative temperatures, the0.1875 0011 0000 30
unsigned low byte adds to the negative high byte toresult in a value more than the high byte (for0.2500 0100 0000 40
instance, – 15 + 0.75 = – 14.25, not – 15.75).0.3125 0101 0000 500.3750 0110 0000 600.4375 0111 0000 70
Calculation Example0.5000 1000 0000 80
For positive temperatures (for example, +20 ° C):0.5625 1001 0000 90
(+20 ° C)/(1 ° C/count) = 20 →14h →0001 01000.6250 1010 0000 A0
Convert the number to binary code with 8-bit,0.6875 1011 0000 B0
right-justified format, and MSB = '0' to denote a0.7500 1100 0000 C0
positive sign.0.8125 1101 0000 D0
+20 ° C is stored as 0001 0100 →14h.0.8750 1110 0000 E0
For negative temperatures (for example, – 20 ° C):0.9375 1111 0000 F0
(| – 20 ° C|)/(1 ° C/count) = 20 →14h →0001 0100(1) Resolution is 0.0625 ° C/count. All possible values are shown.
Generate the twos complement of a negativenumber by complementing the absolute valuebinary number and adding 1.– 20 ° C is stored as 1110 1100 →ECh.
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REGISTER INFORMATION
POINTER REGISTER
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
The TMP441/42 contain multiple registers for holdingconfiguration information, temperature measurementresults, and status information. These registers aredescribed in Figure 14 and Table 3 .
Figure 14 shows the internal register structure of theTMP441/42. The 8-bit Pointer Register is used toaddress a given data register. The Pointer Registeridentifies which of the data registers should respondto a read or write command on the Two-Wire bus.This register is set with every write command. A writecommand must be issued to set the proper value inthe Pointer Register before executing a readcommand. Table 3 describes the pointer address of Figure 14. Internal Register Structurethe TMP441/42 registers. The power-on reset (POR)value of the Pointer Register is 00h (0000 0000b).
Table 3. Register MapBIT DESCRIPTIONPOINTER 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)
(1)
01 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Remote Temperature 1 (High Byte)
(1)
02 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Remote Temperature 2 (High Byte)
(1) (2)
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
(2)
0 0 REN2
(2)
REN LEN RC 0 0 Configuration Register 2
0B 07 0 0 0 0 0 R2 R1 R0 Conversion Rate Register
0C 08/88
(2)
BC23
(2)
BC22
(2)
BC21
(2)
BC20
(2)
BC13 BC12 BC11 BC10 Beta Compensation
0F X X X X X X X X One-Shot Start
(3)
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)
(2)
21 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 ηCorrection 1
22 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 ηCorrection 2
(2)
FC X X X X X X X X Software Reset
(4)
FE 55 0 1 0 1 0 1 0 1 Manufacturer ID
41 0 1 0 0 0 0 0 1 TMP441 Device IDFF
42 0 1 0 0 0 0 1 0 TMP442 Device ID
(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.
Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 11
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TEMPERATURE REGISTERS STATUS REGISTER
CONFIGURATION REGISTER 1
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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The TMP441/42 have four 8-bit registers that hold The Status Register reports the state of thetemperature measurement results. Both the local temperature ADCs. Table 4 shows the Statuschannel and the remote channel have a high byte Register bits. The Status Register is read-only, and isregister that contains the most significant bits (MSBs) read by accessing pointer address 08h. The BUSY bitof 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 localchannel low byte address is 10h. The remote channel
Configuration Register 1 (pointer address 09h) setshigh byte is at address 01h; the remote channel low
the temperature range and controls shutdown mode.byte address is 11h. For the TMP442, the second
The Configuration Register is set by writing to pointerremote channel high byte address is 02h; the second
address 09h and read by reading from pointerremote channel low byte is 12h. These registers are
address 09h. The shutdown (SD) bit (bit 6) enables orread-only and are updated by the ADC each time a
disables the temperature measurement circuitry. Iftemperature measurement is completed.
SD = '0', the TMP441/42 convert continuously at theThe TMP441/42 contain circuitry to assure that a low
rate set in the conversion rate register. When SD isbyte register read command returns data from the
set to '1', the TMP441/42 stop converting when thesame ADC conversion as the immediately preceding
current conversion sequence is complete and entershigh byte read command. This condition remains
a shutdown mode. When SD is set to '0' again, thevalid only until another register is read. For proper
TMP441/42 resume continuous conversions. Whenoperation, the high byte of a temperature register
SD = '1', a single conversion can be started by writingshould be read first. The low byte register should be
to the One-Shot Register.read in the next read command. The low byte register
The temperature range is set by configuring bit 2 ofmay be left unread if the LSBs are not needed.
the Configuration Register. Setting this bit lowAlternatively, the temperature registers may be read
configures the TMP441/42 for the standardas a 16-bit register by using a single two-byte read
measurement range ( – 55 ° C to +127 ° C); temperaturecommand from address 00h for the local channel
conversions are stored in the standard binary format.result, or from address 01h for the remote channel
Setting bit 2 high configures the TMP441/42 for theresult (02h for the second remote channel result).
extended measurement range ( – 55 ° C to +150 ° C);The high byte is output first, followed by the low byte.
temperature conversions are stored in the extendedBoth bytes of this read operation are from the same
binary format (see Table 1 ). The remaining bits of theADC conversion. The power-on reset value of all
Configuration Register are reserved and must alwaystemperature registers is 00h.
be set to '0'. The power-on reset value for thisregister is 00h. Table 5 summarizes the bits ofConfiguration Register 1.
Table 4. Status Register FormatSTATUS REGISTER (Read = 08h, Write = NA)
BIT # D7 D6 D5 D4 D3 D2 D1 D0
BIT NAME BUSY 0000000
POR VALUE 0
(1)
0000000
(1) The BUSY changes to ' 1 ' almost immediately ( < 100 µs) following power-up, as the TMP441/42 begins the first temperature conversion.It is high whenever the TMP441/42 converts a temperature reading.
Table 5. Configuration Register 1 Bit DescriptionsCONFIGURATION REGISTER 1 (Read/Write = 09h, POR = 00h)
BIT NAME FUNCTION POWER-ON RESET VALUE
7 Reserved — 0
0 = Run6 SD 01 = Shut down
5, 4, 3 Reserved — 0
0 = – 55 ° C to +127 ° C2 Temperature Range 01 = – 55 ° C to +150 ° C
1, 0 Reserved — 0
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ONE-SHOT CONVERSION
CONFIGURATION REGISTER 2
CONVERSION RATE REGISTER
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
The LEN bit enables the local temperaturemeasurement channel. If LEN = '1', the local channelWhen the TMP441/42 are in shutdown mode (SD = 1
is enabled; if LEN = '0', the local channel is disabled.in the Configuration Register 1), a single conversioncan start on all enabled channels by writing any value The REN bit enables external temperatureto 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
For the TMP442 only, the REN2 bit enables thethe write command is irrelevant and is not stored by
second external measurement channel (connected tothe TMP441/42. When the TMP441/42 are in
pins 3 and 4.) If REN2 = '1', the second externalshutdown mode, the conversion sequence currently
channel is enabled; if REN2 = '0', the second externalin process must be completed before a one-shot
channel is disabled.command can be issued. One-shot commands issuedduring a conversion are ignored.
The temperature measurement sequence is localchannel, external channel 1, external channel 2,shutdown, and delay (to set conversion rate, ifnecessary). The sequence starts over with the localConfiguration Register 2 (pointer address 0Ah)
channel. If any of the channels are disabled, they arecontrols which temperature measurement channels
skipped in the sequence. Table 6 summarizes theare enabled and whether the external channels have
bits of Configuration Register 2.the resistance correction feature enabled or not.
The RC bit enables the resistance correction featurefor the external temperature channels. If RC = '1',
The Conversion Rate Register (pointer address 0Bh)series resistance correction is enabled; if RC = '0',
controls the rate at which temperature conversionsresistance correction is disabled. Resistance
are performed. This register adjusts the idle timecorrection should be enabled for most applications.
between conversions but not the conversion timingHowever, disabling the resistance correction may
itself, thereby allowing the TMP441/42 poweryield slightly improved temperature measurement
dissipation to be balanced with the temperaturenoise performance, and reduce conversion time by
register update rate. Table 7 shows the conversionabout 50%, which could lower power consumption
rate options and corresponding current consumption.when conversion rates of two per second or less are
A one-shot command can be used during the idleselected.
time between conversions to immediately starttemperature conversions on all enabled channels.
Table 6. Configuration Register 2 Bit DescriptionsCONFIGURATION REGISTER 2 (Read/Write = 0Ah, POR = 1Ch for TMP441; 3Ch for TMP442)
BIT NAME FUNCTION POWER-ON RESET VALUE
7, 6 Reserved — 0
0 = External channel 2 disabled 1 (TMP442)5 REN2
1 = External channel 2 enabled 0 (TMP441)
0 = External channel 1 disabled4 REN 11 = External channel 1 enabled
0 = Local channel disabled3 LEN 11 = Local channel enabled
0 = Resistance correction disabled2 RC 11 = Resistance correction enabled
1, 0 Reserved — 0
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BETA COMPENSATION CONFIGURATION
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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continue to be GND collector-connected in this mode,REGISTER but no beta compensation is applied. When the betacompensation configuration is set to '0111' or theIf the Beta Compensation Configuration Register is
sensor is diode-connected (base shorted to collector),set to '1xxx' (beta compensation enabled) for a given
the η-factor used by the TMP441/42 is 1.008. Whenchannel at the beginning of each temperature
the beta compensation configuration is set to '1xxx'conversion, the TMP441/42 automatically detects if
(beta compensation enabled) and the sensor is GNDthe sensor is diode-connected or GND
collector-connected (PNP collector to ground), thecollector-connected, selects the proper beta range,
η-factor used by the TMP441/42 is 1.000. Table 8and measures the sensor temperature appropriately.
shows the read values for the selected beta rangesand the appropriate η-Factor used for eachIf the Beta Compensation Configuration Register is
conversion.set to '0111' (beta compensation disabled) for a givenchannel, the automatic detection is bypassed and thetemperature is measured assuming adiode-connected sensor. A PNP transistor may
Table 7. Conversion Rate RegisterCONVERSION RATE REGISTER (Read/Write = 0Bh, POR = 07h)
AVERAGE I
Q
(TYP) ( µA),V
S
= 5.5V
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
00000111 8
(1)
634 652
(1) Conversion rate depends on which channels are enabled.
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 126ms1001 Automatically selected range 1 (0.16 < beta < 0.26) 1.000 126ms1010 Automatically selected range 2 (0.24 < beta < 0.43) 1.000 126ms1011 Automatically selected range 3 (0.35 < beta < 0.78) 1.000 126ms1100 Automatically selected range 4 (0.64 < beta < 1.8) 1.000 126ms1101 Automatically selected range 5 (1.4 < beta < 9.0) 1.000 126ms1110 Automatically selected range 6 (6.7 < beta < 40.0) 1.000 126ms1111 Automatically selected range 7 (beta > 27.0) 1.000 126ms1111 Automatically detected diode connected sensor 1.008 93ms0000 Manually selected range 0 (0.10 < beta < 0.5) 1.000 93ms0001 Manually selected range 1 (0.13 < beta < 1.0) 1.000 93ms0010 Manually selected range 2 (0.18 < beta < 2.0) 1.000 93ms0011 Manually selected range 3 (0.3 < beta < 25) 1.000 93ms0100 Manually selected range 4 (0.5 < beta < 50) 1.000 93ms0101 Manually selected range 5 (1.1 < beta < 100) 1.000 93ms0110 Manually selected range 6 (2.4 < beta < 150) 1.000 93ms0111 Manually disabled beta correction 1.008 93ms
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η-FACTOR CORRECTION REGISTER
hkT
q
V =-
BE2 BE1
Vln I2
I1
()
(1)
SOFTWARE RESET
1.008 300
300 N
´
-ADJUST
heff =
(2)
IDENTIFICATION REGISTERS
300 1.008´
heff
NADJUST =300 -
(3)
1.000 300
300 N
´
-ADJUST
heff =
(4)
300 1.000´
heff
NADJUST =300 -
(5)
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
Table 9. η-Factor RangeN
ADJUSTThe TMP441/42 allow for a different η-factor value to
η-FACTOR η-FACTORBINARY HEX DECIMAL = 1.008 = 1.000be used for converting remote channel
0111 1111 7F 127 1.747977 1.734104measurements to temperature. The remote channeluses sequential current excitation to extract a
0000 1010 0A 10 1.042759 1.034482differential V
BE
voltage measurement to determine
0000 1000 08 8 1.035616 1.027397the temperature of the remote transistor. Equation 1
0000 0110 06 6 1.028571 1.020408relates this voltage and temperature.
0000 0100 04 4 1.021622 1.013513
0000 0010 02 2 1.014765 1.006711
0000 0001 01 1 1.011371 1.003344
0000 0000 00 0 1.008 1.000The value ηin Equation 1 is a characteristic of the
1111 1111 FF – 1 1.004651 0.996677particular transistor used for the remote channel.
1111 1110 FE – 2 1.001325 0.993377When the beta compensation configuration is set to
1111 1100 FC – 4 0.994737 0.986842'0111' (beta compensation disabled) or the sensor is
1111 1010 FA – 6 0.988235 0.980392diode-connected (base shorted to collector), the
1111 1000 F8 – 8 0.981818 0.974025η-factor used by the TMP441/42 is 1.008. When the
1111 0110 F6 – 10 0.975484 0.967741beta compensation configuration is set to '1000' (beta
1000 0000 80 – 128 0.706542 0.700934compensation enabled) and the sensor is GNDcollector-connected (PNP collector to ground), theη-factor used by the TMP441/42 is 1.000. If theη-factor used for the temperature conversion does
The TMP441/42 may be reset by writing any value tonot match the characteristic of the sensor, then
the Software Reset Register (pointer address FCh).temperature offset is observed. The value in the
This action restores the power-on reset state to all ofη-Factor Correction Register may be used to adjust
the TMP441/42 registers as well as aborts anythe effective η-factor according to Equation 2 and
conversion in process. The TMP441/42 also supportEquation 3 for disabled beta compensation or a
reset via the Two-Wire general call address (0000diode-connected sensor. Equation 4 and Equation 5
0000). The TMP441/42 acknowledge the general callmay be used for enabled beta compensation and a
address and respond to the second byte. If theGND collector-connected sensor.
second byte is 0000 0110, the TMP441/42 execute asoftware reset. The TMP441/42 do not respond toother values in the second byte.
The TMP441/42 allow for the Two-Wire bus controllerto query the device for manufacturer and device IDsto enable software identification of the device at theparticular Two-Wire bus address. The manufacturerID is obtained by reading from pointer address FEh.The device ID is obtained by reading from pointerThe η-correction value must be stored in twos
address FFh. The TMP441/42 both return 55h for thecomplement format, yielding an effective data range
manufacturer code. The TMP441 returns 41h for thefrom – 128 to +127. Table 9 shows the η-factor range
device ID and the TMP442 returns 42h for the devicefor both 1.008 and 1.000. The η-correction value may
ID. These registers are read-only.be written to and read from pointer address 21h. (Theη-correction value for the second remote channel isread to/written from pointer address 22h.) Theregister power-on reset value is 00h, thus having noeffect unless the register is written to.
space
space
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BUS OVERVIEW
READ/WRITE OPERATIONS
SERIAL INTERFACE
SERIAL BUS ADDRESS
TWO-WIRE INTERFACE SLAVE DEVICE
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
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Table 10. TMP441 Slave Address Options
TWO-WIRE SLAVEThe TMP441/42 are SMBus interface-compatible. In
ADDRESS A1 A0SMBus protocol, the device that initiates the transfer
0011 100 Float 0is called a master, and the devices controlled by themaster are slaves. The bus must be controlled by a 0011 101 Float 1master device that generates the serial clock (SCL),
0011 110 0 Floatcontrols the bus access, and generates the START
0011 111 1 Floatand STOP conditions.
0101 010 Float FloatTo address a specific device, a START condition is
1001 100 0 0initiated. START is indicated by pulling the data line
1001 101 0 1(SDA) from a high-to-low logic level while SCL is
1001 110 1 0high. All slaves on the bus shift in the slave address
1001 111 1 1byte, with the last bit indicating whether a read orwrite operation is intended. During the ninth clock
The TMP442 has a factory-preset slave address. Thepulse, the slave being addressed responds to the
TMP442A slave address is 1001100b, and themaster by generating an Acknowledge and pulling
TMP442B slave address is 1001101b. TheSDA low.
configuration of the DXP and DXN channels areData transfer is then initiated and sent over eight
independent of the address. Unused DXP channelsclock pulses followed by an Acknowledge bit. During
can be left open or tied to GND.data transfer SDA must remain stable while SCL ishigh, because any change in SDA while SCL is highis interpreted as a control signal.
Accessing a particular register on the TMP441/42 isOnce all data have been transferred, the master
accomplished by writing the appropriate value to thegenerates a STOP condition. STOP is indicated by
Pointer Register. The value for the Pointer Register ispulling SDA from low to high, while SCL is high.
the first byte transferred after the slave address bytewith the R/ W bit low. Every write operation to theTMP441/42 requires a value for the Pointer Register(see Figure 16 ).The TMP441/42 operate only as a slave device oneither the Two-Wire bus or the SMBus. Connections
When reading from the TMP441/42, the last valueto either bus are made via the open-drain I/O lines,
stored in the Pointer Register by a write operation isSDA and SCL. The SDA and SCL pins feature
used to determine which register is read by a readintegrated spike suppression filters and Schmitt
operation. To change the register pointer for a readtriggers to minimize the effects of input spikes and
operation, a new value must be written to the Pointerbus noise. The TMP441/42 support the transmission
Register. This transaction is accomplished by issuingprotocol for fast (1kHz to 400kHz) and high-speed
a slave address byte with the R/ W bit low, followed(1kHz to 3.4MHz) modes. All data bytes are
by the Pointer Register byte; no additional data aretransmitted MSB first.
required. The master can then generate a STARTcondition and send the slave address byte with theR/ W bit high to initiate the read command. SeeFigure 18 for details of this sequence. If repeatedTo communicate with the TMP441/42, the master
reads from the same register are desired, it is notmust first address slave devices via a slave address
necessary to continually send the Pointer Registerbyte. The slave address byte consists of seven
bytes, because the TMP441/42 retain the Pointeraddress bits, and a direction bit indicating the intent
Register value until it is changed by the next writeof executing a read or write operation.
operation. Note that register bytes are sent MSB first,followed by the LSB.
ADDRESSES Read operations should be terminated by issuing aNot-Acknowledge command at the end of the lastThe TMP441 supports nine slave device addresses.
byte to be read. For a single-byte operation, theThe TMP442A and TMP442B are available in two
master should leave the SDA line high during thedifferent fixed serial interface addresses.
Acknowledge time of the first byte that is read fromthe slave. For a two-byte read operation, the masterThe slave device address for the TMP441 is set by
must pull SDA low during the Acknowledge time ofthe A1 and A0 pins, as summarized in Table 10 .
the first byte read, and should leave SDA high duringthe Acknowledge time of the second byte read fromthe slave.
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TIMING DIAGRAMS
SCL
SDA
t(LOW) tRtFt(HDSTA)
t(HDSTA)
t(HDDAT)
t(BUF)
t(SUDAT)
t(HIGH) t(SUSTA) t(SUSTO)
P S S P
TMP441
TMP442
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.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
Data Transfer: The number of data bytes transferredbetween a START and a STOP condition is notThe TMP441/42 are Two-Wire and
limited and is determined by the master device. TheSMBus-compatible. Figure 15 to Figure 18 describe
receiver acknowledges data transfer.the various operations on the TMP441/42.Parameters for Figure 15 are defined in Table 11 .Acknowledge: Each receiving device, whenBus definitions are: addressed, is obliged to generate an Acknowledgebit. A device that acknowledges must pull down theBus Idle: Both SDA and SCL lines remain high.
SDA line during the Acknowledge clock pulse in sucha way that the SDA line is stable low during the highStart Data Transfer: A change in the state of the
period of the Acknowledge clock pulse. Setup andSDA line, from high to low, while the SCL line is high,
hold times must be taken into account. On a masterdefines a START condition. Each data transfer is
receive, data transfer termination can be signaled byinitiated with a START condition.
the master generating a Not-Acknowledge on the lastStop Data Transfer: A change in the state of the
byte that has been transmitted by the slave.SDA line from low to high while the SCL line is highdefines a STOP condition. Each data transferterminates with a repeated START or STOPcondition.
Figure 15. Two-Wire Timing Diagram
Table 11. Timing Characteristics for Figure 15FAST MODE HIGH-SPEED MODE
PARAMETER MIN MAX MIN MAX UNIT
SCL operating frequency f
(SCL)
0.001 0.4 0.001 3.4 MHz
Bus free time between STOP and START conditions t
(BUF)
600 160 ns
Hold time after repeated START condition. After this period, the first clock
t
(HDSTA)
100 100 nsis generated.
Repeated START condition setup time t
(SUSTA)
100 100 ns
STOP condition setup time t
(SUSTO)
100 100 ns
Data hold time t
(HDDAT)
0 0 ns
Data setup time t
(SUDAT)
100 10 ns
SCL clock LOW period t
(LOW)
1300 160 ns
SCL clock HIGH period t
(HIGH)
600 60 ns
Clock/Data fall time t
F
300 160 ns
Clock/Data rise time t
R
300 160 ns
for SCL ≤100kHz t
R
1000 ns
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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/WP7 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/WP7 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/WD7 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 ..............................................................................................................................................
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Figure 16. Two-Wire Timing Diagram for Write Word Format
Figure 17. Two-Wire Timing Diagram for Single-Byte Read Format
18 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated
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/WP7 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/WD7 D6 D5 D4 D3 D2 D1 D0
Frame5DataByte2ReadRegister
StopBy
Master
NACKBy
Master(2)
From
TMP441/42
19
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
HIGH-SPEED MODE
UNDERVOLTAGE LOCKOUT
TIMEOUT FUNCTION
GENERAL CALL RESET
SHUTDOWN MODE (SD)
FILTERING
SENSOR FAULT
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 ..............................................................................................................................................
www.ti.com
When not using the remote sensor with theTMP441/42, the DXP and DXN inputs must beIn order for the Two-Wire bus to operate at
connected together to prevent meaningless faultfrequencies above 400kHz, the master device must
warnings.issue a High-Speed mode (Hs-mode) master code(0000 1xxx) as the first byte after a START conditionto switch the bus to high-speed operation. TheTMP441/42 acknowledge this byte, but switch the
The TMP441/42 sense when the power-supplyinput filters on SDA and SCL and the output filter on
voltage has reached a minimum voltage level for theSDA to operate in Hs-mode, allowing transfers at up
ADC to function. The detection circuitry consists of ato 3.4MHz. After the Hs-mode master code has been
voltage comparator that enables the ADC after theissued, the master transmits a Two-Wire slave
power supply (V+) exceeds 2.45V (typical). Theaddress to initiate a data transfer operation. The bus
comparator output is continuously checked during acontinues to operate in Hs-mode until a STOP
conversion. The TMP441/42 do not perform acondition occurs on the bus. Upon receiving the
temperature conversion if the power supply is notSTOP condition, the TMP441/42 switch the input and
valid. The PVLD bit (bit 1, see Table 3 ) of theoutput filters back to fast mode operation.
Local/Remote Temperature Register is set to '1' andthe temperature result may be incorrect.
The TMP441/42 reset the serial interface if eitherSCL or SDA are held low for 32ms (typical) between
The TMP441/42 support reset via the Two-Wirea START and STOP condition. If the TMP441/42 are
General Call address 00h (0000 0000b). Theholding the bus low, they release the bus and waits
TMP441/42 acknowledge the General Call addressfor a START condition. To avoid activating the
and respond to the second byte. If the second byte istimeout function, it is necessary to maintain a
06h (0000 0110b), the TMP441/42 execute acommunication speed of at least 1kHz for the SCL
software reset. This software reset restores theoperating frequency.
power-on reset state to all TMP441/42 registers, andaborts any conversion in progress. The TMP441/42take no action in response to other values in thesecond byte.The TMP441/42 Shutdown Mode allows maximumpower to be saved by shutting down all devicecircuitry other than the serial interface, reducingcurrent consumption to typically less than 3 µA; see
Remote junction temperature sensors are usuallyFigure 6 ,Shutdown Quiescent Current vs Supply
implemented in a noisy environment. Noise isVoltage. Shutdown Mode is enabled when the SD bit
frequently generated by fast digital signals and if notof the Configuration Register is high; the device shuts
filtered properly will induce errors that can corruptdown once the current conversion is completed.
temperature measurements. The TMP441/42 have aWhen SD is low, the device maintains a continuous
built-in 65kHz filter on the inputs of DXP and DXN toconversion state.
minimize the effects of noise. However, a differentiallow-pass filter can help attenuate unwanted coupledsignals. If filtering is needed, suggested componentvalues are 100pF and 50 Ωon each input; exactThe TMP441/42 can sense a fault at the DXP input
values are application-specific. It is alsoresulting from incorrect diode connection and can
recommended that the capacitor value remainssense an open circuit. Short-circuit conditions return a
between 0pF to 330pF with a series resistance lessvalue of – 64 ° C. The detection circuitry consists of a
than 1k Ω.voltage comparator that trips when the voltage atDXP exceeds (V+) – 0.6V (typical). The comparatoroutput is continuously checked during a conversion. Ifa fault is detected, the OPEN bit (bit 0) in thetemperature result register is set to '1' and the rest ofthe register bits should be ignored.
20 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated
Product Folder Link(s): TMP441 TMP442
REMOTE SENSING
MEASUREMENT ACCURACY AND THERMAL
h - 1.008
1.008
T =
err
()
´(273.15+T( C))°
(6)
TERR +ǒ1.004 *1.008
1.008 Ǔ ǒ273.15 )100°CǓ
TERR +1.48°C
(7)
TMP441
TMP442
www.ti.com
.............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
lowest sensed temperature.3. Base resistance < 100 Ω.The TMP441/42 are designed to be used with eitherdiscrete transistors or substrate transistors built into 4. Tight control of V
BE
characteristics indicated byprocessor chips and ASICs. Either NPN- or PNP-type small variations in h
FE
(that is, 50 to 150).transistors can be used, as long as the base-emitter
Based on these criteria, two recommendedjunction is used as the remote temperature sense.
small-signal transistors are the 2N3904 (NPN) orNPN transistors must be diode-connected. PNP
2N3906 (PNP).transistors can either be transistor- ordiode-connected (see Figure 12 ).
Errors in remote temperature sensor readings are
CONSIDERATIONStypically the consequence of the ideality factor and
The temperature measurement accuracy of thecurrent excitation used by the TMP441/42 versus the
TMP441/42 depends on the remote and/or localmanufacturer-specified operating current for a given
temperature sensor being at the same temperaturetransistor. Some manufacturers specify a high-level
as the system point being monitored. Clearly, if theand low-level current for the temperature-sensing
temperature sensor is not in good thermal contactsubstrate transistors. The TMP441/42 use 6 µA for
with the part of the system being monitored, thenI
LOW
and 120 µA for I
HIGH
. The TMP441/42 allow for
there will be a delay in the response of the sensor todifferent η-factor values; see the η-Factor Correction
a temperature change in the system. For remoteRegister section. The ideality factor ( η) is a measured
temperature-sensing applications that use a substratecharacteristic of a remote temperature sensor diode
transistor (or a small, SOT23 transistor) placed closeas compared to an ideal diode.
to the device being monitored, this delay is usuallyThe ideality factor for the TMP441/42 is trimmed to
not a concern.be 1.008. For transistors that have an ideality factor
The local temperature sensor inside the TMP441/42that does not match the TMP441/42, Equation 6 can
monitors the ambient air around the device. Thebe used to calculate the temperature error. Note that
thermal time constant for the TMP441/42 isfor the equation to be used correctly, actual
approximately two seconds. This constant impliestemperature ( ° C) must be converted to kelvins (K).
that if the ambient air changes quickly by 100 ° C, itwould take the TMP441/42 approximately 10 seconds(that is, five thermal time constants) to settle to within1 ° C of the final value. In most applications, theWhere:
TMP441/42 package is in electrical, and thereforeη= ideality factor of remote temperature sensor
thermal, contact with the printed circuit board (PCB),as well as subjected to forced airflow. The accuracyT( ° C) = actual temperature
of the measured temperature directly depends onT
ERR
= error in TMP441/42 due to n ≠1.008
how accurately the PCB and forced airflowDegree delta is the same for ° C and K
temperatures represent the temperature that theTMP441/42 is measuring. Additionally, the internalFor η= 1.004 and T( ° C) = 100 ° C:
power dissipation of the TMP441/42 can cause thetemperature to rise above the ambient or PCBtemperature. The internal power dissipated as aresult of exciting the remote temperature sensor isnegligible because of the small currents used. For a5.5V supply and maximum conversion rate of eightIf a discrete transistor is used as the remote
conversions per second, the TMP441/42 dissipatetemperature sensor with the TMP441/42, the best
5.2mW (PD
IQ
= 5.5V × 950 µA). A θ
JA
of 100 ° C/Waccuracy can be achieved by selecting the transistor
causes the junction temperature to rise approximatelyaccording to the following criteria:
+0.23 ° C above the ambient.1. Base-emitter voltage > 0.25V at 6 µA, at thehighest sensed temperature.2. Base-emitter voltage < 0.95V at 120 µA, at the
Copyright © 2008 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 21
Product Folder Link(s): TMP441 TMP442
LAYOUT CONSIDERATIONS
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 ..............................................................................................................................................
www.ti.com
Remote temperature sensing on the TMP441/42measures very small voltages using very lowcurrents; therefore, noise at the IC inputs must beminimized. Most applications using the TMP441/42will have high digital content, with several clocks andlogic level transitions creating a noisy environment.Layout should adhere to the following guidelines:1. Place the TMP441/42 as close to the remotejunction sensor as possible.2. Route the DXP and DXN traces next to eachother and shield them from adjacent signalsthrough the use of ground guard traces, asshown in Figure 19 . If a multilayer PCB is used,bury these traces between ground or V
DD
planesto shield them from extrinsic noise sources. 5 mil(0.005 in, or 0,127 mm) PCB traces arerecommended.
3. Minimize additional thermocouple junctions
Figure 19. Suggested PCB Layer Cross-Sectioncaused by copper-to-solder connections. If thesejunctions are used, make the same number andapproximate locations of copper-to-solderconnections in both the DXP and DXNconnections to cancel any thermocouple effects.4. Use a 0.1 µF local bypass capacitor directlybetween the V+ and GND of the TMP441/42, asshown in Figure 20 . Minimize filter capacitancebetween DXP and DXN to 330pF or less foroptimum measurement performance. Thiscapacitance includes any cable capacitancebetween the remote temperature sensor andTMP441/42.
5. If the connection between the remotetemperature sensor and the TMP441/42 is lessthan 8 in (20,32 cm) long, use a twisted-wire pairconnection. Beyond 8 in, use a twisted, shieldedpair with the shield grounded as close to theTMP441/42 as possible. Leave the remote sensorconnection end of the shield wire open to avoidground loops and 60Hz pickup.6. Thoroughly clean and remove all flux residue inand around the pins of the TMP441/42 to avoidtemperature offset readings as a result of leakagepaths between DXP or DXN and GND, orbetween DXP or DXN and V+.
Figure 20. Suggested Bypass CapacitorPlacement and Trace Shielding
22 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated
Product Folder Link(s): TMP441 TMP442
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TMP441AIDCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
TMP441AIDCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
TMP442ADCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
TMP442ADCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
TMP442BDCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
TMP442BDCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
(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.
PACKAGE OPTION ADDENDUM
www.ti.com 30-Mar-2009
Addendum-Page 1
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0 (mm) B0 (mm) K0 (mm) P1
(mm) W
(mm) Pin1
Quadrant
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
PACKAGE MATERIALS INFORMATION
www.ti.com 27-Mar-2009
Pack Materials-Page 1
*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
PACKAGE MATERIALS INFORMATION
www.ti.com 27-Mar-2009
Pack Materials-Page 2
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