Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

TMP411-Q1 Datasheet(PDF) 29 Page - Texas Instruments

Click here to check the latest version.
Part # TMP411-Q1
Description  짹1째C Remote and Local Temperature Sensor With N-Factor and Series Resistance Correction
Download  40 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP411-Q1 Datasheet(HTML) 29 Page - Texas Instruments

Back Button TMP411-Q1 Datasheet HTML 25Page - Texas Instruments TMP411-Q1 Datasheet HTML 26Page - Texas Instruments TMP411-Q1 Datasheet HTML 27Page - Texas Instruments TMP411-Q1 Datasheet HTML 28Page - Texas Instruments TMP411-Q1 Datasheet HTML 29Page - Texas Instruments TMP411-Q1 Datasheet HTML 30Page - Texas Instruments TMP411-Q1 Datasheet HTML 31Page - Texas Instruments TMP411-Q1 Datasheet HTML 32Page - Texas Instruments TMP411-Q1 Datasheet HTML 33Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 29 / 40 page
background image
1.004 1.008
(
) (273.15 100
)
1.008
1.48
ERR
ERR
T
C
T
C
-
=
´
+
°
= -
°
1.008
(
) (273.15
(
))
1.008
ERR
n
T
T
C
-
=
´
+
°
TMP411-Q1
www.ti.com
SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013
REMOTE SENSING
4. Tight control of VBE characteristics indicated by
small variations in hFE (that is, 50 to 150).
The TMP411-Q1 is designed to be used with either
discrete transistors or substrate transistors built into
Based on these criteria, two recommended small-
processor chips and ASICs. Either NPN or PNP
signal transistors are the 2N3904 (NPN) or 2N3906
transistors can be used, as long as the base-emitter
(PNP).
junction is used as the remote temperature sense.
Either a transistor or diode connection can also be
MEASUREMENT ACCURACY AND THERMAL
used; see Figure 11.
CONSIDERATIONS
Errors in remote temperature-sensor readings are the
The temperature measurement accuracy of the
consequence of the ideality factor and current
TMP411-Q1 depends on the remote and/or local
excitation used by the TMP411-Q1 versus the
temperature sensor being at the same temperature
manufacturer-specified operating current for a given
as the system point being monitored. Clearly, if the
transistor. Some manufacturers specify a high-level
temperature sensor is not in good thermal contact
and low-level current for the temperature-sensing
with the part of the system being monitored, then
substrate transistors. The TMP411-Q1 uses 6
μA for
there is a delay in the response of the sensor to a
ILOW and 120 μA for IHIGH. The TMP411-Q1 allows for
temperature change in the system. For remote
different n-factor values; see the N-Factor Correction
temperature sensing applications using a substrate
Register section.
transistor (or a small, SOT23 transistor) placed close
to the device being monitored, this delay is usually
The ideality factor (n) is a measured characteristic of
not a concern.
a remote temperature sensor diode as compared to
an ideal diode. The ideality factor for the TMP411-Q1
The local temperature sensor inside the TMP411-Q1
is trimmed to be 1.008. For transistors whose ideality
monitors the ambient air around the device. The
factor does not match the TMP411-Q1, Equation 4
thermal
time
constant
for
the
TMP411-Q1
is
can be used to calculate the temperature error. Note
approximately two seconds. This constant implies
that for the equation to be used correctly, actual
that if the ambient air changes quickly by 100°C, it
temperature (°C) must be converted to Kelvin (K).
would take the TMP411-Q1 about 10 seconds (that
is, five thermal time constants) to settle to within 1°C
of the final value. In most applications, the TMP411-
(4)
Q1 package is in electrical and therefore thermal
contact with the printed circuit board (PCB), as well
where:
as subjected to forced airflow. The accuracy of the
n = Ideality factor of remote temperature sensor
measured temperature directly depends on how
T(°C) = actual temperature
accurately the PCB and forced airflow temperatures
represent the temperature that the TMP411-Q1 is
TERR = Error in TMP411-Q1 reading due to n ≠
measuring. Additionally, the internal power dissipation
1.008
of the TMP411-Q1 can cause the temperature to rise
Degree delta is the same for °C and °K
above the ambient or PCB temperature. The internal
For n = 1.004 and T(°C) = 100°C:
power dissipated as a result of exciting the remote
temperature sensor is negligible because of the small
currents used. For a 5.5-V supply and maximum
conversion rate of eight conversions per second, the
TMP411-Q1 dissipates 1.82 mW (PDIQ = 5.5 V × 330
(5)
μA). If both the ALERT/THERM2 and THERM pins
If a discrete transistor is used as the remote
are each sinking 1 mA, an additional power of 0.8
temperature sensor with the TMP411-Q1, the best
mW is dissipated (PDOUT = 1 mA × 0.4 V + 1 mA ×
accuracy can be achieved by selecting the transistor
0.4 V = 0.8 mW). Total power dissipation is then 2.62
according to the following criteria:
mW (PDIQ + PDOUT) and, with a θJA of 150°C/W,
1. Base-emitter voltage > 0.25 V at 6
μA, at the
causes the junction temperature to rise approximately
highest sensed temperature.
0.393°C above the ambient.
2. Base-emitter voltage < 0.95 V at 120
μA, at the
lowest sensed temperature.
3. Base resistance < 100
Ω.
Copyright © 2010–2013, Texas Instruments Incorporated
Submit Documentation Feedback
29
Product Folder Links: TMP411-Q1


Similar Part No. - TMP411-Q1

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TMP411-Q1 TI1-TMP411-Q1 Datasheet
1,012Kb / 33P
[Old version datasheet]   Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
More results

Similar Description - TMP411-Q1

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TMP400 TI-TMP400 Datasheet
569Kb / 25P
[Old version datasheet]   짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
logo
Burr-Brown (TI)
TMP411 BURR-BROWN-TMP411_07 Datasheet
375Kb / 28P
   짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
logo
Texas Instruments
TMP411 TI1-TMP411_13 Datasheet
973Kb / 32P
[Old version datasheet]   짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
TMP411ADRG4 TI-TMP411ADRG4 Datasheet
747Kb / 32P
[Old version datasheet]   짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
TMP411 TI1-TMP411_16 Datasheet
1,012Kb / 33P
[Old version datasheet]   Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
TMP451 TI-TMP451 Datasheet
990Kb / 27P
[Old version datasheet]   짹1째C Remote and Local Temperature Sensor with 管-Factor and Offset Correction
logo
Burr-Brown (TI)
TMP411 BURR-BROWN-TMP411 Datasheet
369Kb / 25P
   짹1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
logo
Texas Instruments
TMP451-Q1 TI1-TMP451-Q1_V01 Datasheet
1Mb / 37P
[Old version datasheet]   짹1째C Remote and Local Temperature Sensor With 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
TMP451-Q1 TI1-TMP451-Q1 Datasheet
1Mb / 34P
[Old version datasheet]   짹1째C remote and local temperature sensor with 管-factor and offset correction, series-resistance cancellation, and programmable digital filter
TMP421 TI1-TMP421_15 Datasheet
1Mb / 35P
[Old version datasheet]   짹1째C Remote and Local TEMPERATURE SENSOR
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com