Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

LM20BIM7X Datenblatt(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM20BIM7X
Bauteilbeschribung  LM20 2.4V, 10關A, SC70, micro SMD Temperature Sensor
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM20BIM7X Datenblatt(HTML) 5 Page - National Semiconductor (TI)

  LM20BIM7X Datasheet HTML 1Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 2Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 3Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 4Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 5Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 6Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 7Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 8Page - National Semiconductor (TI) LM20BIM7X Datasheet HTML 9Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 5 / 9 page
background image
1.0 LM20 Transfer Function
The LM20’s transfer function can be described in different
ways with varying levels of precision. A simple linear transfer
function, with good accuracy near 25˚C, is
V
O= −11.69 mV/˚C x T + 1.8663 V
Over the full operating temperature range of −55˚C to
+130˚C, best accuracy can be obtained by using the para-
bolic transfer function
V
O = (−3.88x10
−6xT2) + (−1.15x10−2xT) + 1.8639
solving for T:
A linear transfer function can be used over a limited tempera-
ture range by calculating a slope and offset that give best re-
sults over that range. A linear transfer function can be calcu-
lated from the parabolic transfer function of the LM20. The
slope of the linear transfer function can be calculated using
the following equation:
m = −7.76 x 10
−6x T − 0.0115,
where T is the middle of the temperature range of interest
and m is in V/˚C. For example for the temperature range of
T
min=−30 to Tmax=+100˚C:
T=35˚C
and
m = −11.77 mV/˚C
The offset of the linear transfer function can be calculated
using the following equation:
b = (V
OP(Tmax)+VOP(T)+mx(Tmax+T))/2,
where:
V
OP(Tmax) is the calculated output voltage at Tmax using
the parabolic transfer function for V
O
V
OP(T) is the calculated output voltage at T using the
parabolic transfer function for V
O.
Using this procedure the best fit linear transfer function for
many popular temperature ranges was calculated in
Figure
2. As shown in Figure 2 the error that is introduced by the lin-
ear transfer function increases with wider temperature
ranges.
2.0 Mounting
The LM20 can be applied easily in the same way as other
integrated-circuit temperature sensors. It can be glued or ce-
mented to a surface. The temperature that the LM20 is sens-
ing will be within about +0.02˚C of the surface temperature to
which the LM20’s leads are attached to.
This presumes that the ambient air temperature is almost the
same as the surface temperature; if the air temperature were
much higher or lower than the surface temperature, the ac-
tual temperature measured would be at an intermediate tem-
perature between the surface temperature and the air tem-
perature.
To ensure good thermal conductivity the backside of the
LM20 die is directly attached to the pin 2 GND pin. The tem-
pertures of the lands and traces to the other leads of the
LM20 will also affect the temperature that is being sensed.
Alternatively, the LM20 can be mounted inside a sealed-end
metal tube, and can then be dipped into a bath or screwed
into a threaded hole in a tank. As with any IC, the LM20 and
accompanying wiring and circuits must be kept insulated and
dry, to avoid leakage and corrosion. This is especially true if
the circuit may operate at cold temperatures where conden-
sation can occur. Printed-circuit coatings and varnishes such
as Humiseal and epoxy paints or dips are often used to en-
sure that moisture cannot corrode the LM20 or its connec-
tions.
The thermal resistance junction to ambient (
θ
JA) is the pa-
rameter used to calculate the rise of a device junction tem-
perature due to its power dissipation. For the LM20 the
equation used to calculate the rise in the die temperature is
as follows:
T
J = TA + θJA [(V
+ I
Q)+(V
+ −V
O)IL]
where I
Q is the quiescent current and ILis the load current on
the output. Since the LM20’s junction temperature is the ac-
tual temperature being measured care should be taken to
minimize the load current that the LM20 is required to drive.
The tables shown in
Figure 3 summarize the rise in die tem-
perature of the LM20 without any loading, and the thermal
resistance for different conditions.
Temperature Range
Linear Equation
V
O=
Maximum Deviation of Linear
Equation from Parabolic Equation
(˚C)
T
min (˚C)
T
max (˚C)
−55
+130
−11.79 mV/˚CxT+ 1.8528 V
±1.41
−40
+110
−11.77 mV/˚CxT+ 1.8577 V
±0.93
−30
+100
−11.77 mV/˚CxT+ 1.8605 V
±0.70
-40
+85
−11.67 mV/˚CxT+ 1.8583 V
±0.65
−10
+65
−11.71 mV/˚CxT+ 1.8641 V
±0.23
+35
+45
−11.81 mV/˚CxT+ 1.8701 V
±0.004
+20
+30
−11.69 mV/˚CxT+ 1.8663 V
±0.004
FIGURE 2. First order equations optimized for different temperature ranges.
www.national.com
5


Ähnliche Teilenummer - LM20BIM7X

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
LM20BIM7X NSC-LM20BIM7X Datasheet
652Kb / 10P
   2.4V, 10關A, SC70, micro SMD Temperature Sensor
logo
Texas Instruments
LM20BIM7X TI1-LM20BIM7X Datasheet
1Mb / 18P
[Old version datasheet]   LM20 2.4V, 10關A, SC70, DSBGA Temperature Sensor
LM20BIM7X TI1-LM20BIM7X Datasheet
1Mb / 25P
[Old version datasheet]   DSBGA Temperature Sensor
LM20BIM7X/NOPB TI1-LM20BIM7X/NOPB Datasheet
1Mb / 25P
[Old version datasheet]   DSBGA Temperature Sensor
logo
National Semiconductor ...
LM20BIM7XEP NSC-LM20BIM7XEP Datasheet
250Kb / 9P
   Enhanced Plastic 2.4V, 10uA, SC70, micro SMD Temperature Sensor
More results

Ähnliche Beschreibung - LM20BIM7X

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Texas Instruments
LLSD103A-7 TI1-LLSD103A-7 Datasheet
1Mb / 18P
[Old version datasheet]   LM20 2.4V, 10關A, SC70, DSBGA Temperature Sensor
logo
National Semiconductor ...
LM20 NSC-LM20_05 Datasheet
652Kb / 10P
   2.4V, 10關A, SC70, micro SMD Temperature Sensor
logo
Texas Instruments
LM20 TI-LM20_15 Datasheet
1Mb / 25P
[Old version datasheet]   LM20 2.4-V, 10-關A, SC70, DSBGA Temperature Sensor
LMT89 TI-LMT89 Datasheet
920Kb / 13P
[Old version datasheet]   LMT89 2.4V, 10 A, SC70, Temperature Sensor
LMT88 TI-LMT88 Datasheet
899Kb / 13P
[Old version datasheet]   LMT88 2.4V, 10 A, SC70, DSBGA Temperature Sensor
logo
National Semiconductor ...
LM20EP NSC-LM20EP Datasheet
250Kb / 9P
   Enhanced Plastic 2.4V, 10uA, SC70, micro SMD Temperature Sensor
LM19 NSC-LM19_10 Datasheet
272Kb / 10P
   2.4V, 10關A, TO-92 Temperature Sensor
LM19 NSC-LM19_07 Datasheet
241Kb / 10P
   2.4V, 10關A, TO-92 Temperature Sensor
logo
Texas Instruments
LMT89DCKT TI-LMT89DCKT Datasheet
898Kb / 13P
[Old version datasheet]   LMT89 2.4V, 10UA, SC70, Temperature Sensor
LM19 TI-LM19_15 Datasheet
268Kb / 14P
[Old version datasheet]   LM19 2.4V, 10關A, TO-92 Temperature Sensor
More results


Html Pages

1 2 3 4 5 6 7 8 9


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
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