LM19 Sensor Datasheet

LM19 Datasheet, PDF, Equivalent


Part Number

LM19

Description

Temperature Sensor

Manufacture

National Semiconductor

Total Page 8 Pages
Datasheet
Download LM19 Datasheet


LM19
January 2003
LM19
2.4V, 10µA, TO-92 Temperature Sensor
General Description
The LM19 is a precision analog output CMOS integrated-
circuit temperature sensor that operates over a −55˚C to
+130˚C temperature range. The power supply operating
range is +2.4 V to +5.5 V. The transfer function of LM19 is
predominately linear, yet has a slight predictable parabolic
curvature. The accuracy of the LM19 when specified to a
parabolic transfer function is ±2.5˚C at an ambient tempera-
ture of +30˚C. The temperature error increases linearly and
reaches a maximum of ±3.8˚C at the temperature range
extremes. The temperature range is affected by the power
supply voltage. At a power supply voltage of 2.7 V to 5.5 V
the temperature range extremes are +130˚C and −55˚C.
Decreasing the power supply voltage to 2.4 V changes the
negative extreme to −30˚C, while the positive remains at
+130˚C.
The LM19’s quiescent current is less than 10 µA. Therefore,
self-heating is less than 0.02˚C in still air. Shutdown capa-
bility for the LM19 is intrinsic because its inherent low power
consumption allows it to be powered directly from the output
of many logic gates or does not necessitate shutdown at all.
Applications
n Cellular Phones
n Computers
n Power Supply Modules
n Battery Management
n FAX Machines
n Printers
n HVAC
n Disk Drives
n Appliances
Features
n Rated for full −55˚C to +130˚C range
n Available in a TO-92 package
n Predictable curvature error
n Suitable for remote applications
Key Specifications
j Accuracy at +30˚C
j Accuracy at +130˚C & −55˚C
j Power Supply Voltage Range
j Current Drain
j Nonlinearity
j Output Impedance
j Load Regulation
0 µA < IL< +16 µA
±2.5 ˚C (max)
±3.5 to ±3.8 ˚C (max)
+2.4V to +5.5V
10 µA (max)
±0.4 % (typ)
160 (max)
−2.5 mV (max)
Typical Application
Output Voltage vs Temperature
20004002
VO = (−3.88x10−6xT2) + (−1.15x10−2xT) + 1.8639
or
20004024
where:
T is temperature, and VO is the measured output voltage of the LM19.
FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)
Operating from a Single Li-Ion Battery Cell
© 2003 National Semiconductor Corporation DS200040
www.national.com

LM19
Typical Application (Continued)
Temperature (T)
+130˚C
+100˚C
+80˚C
+30˚C
+25˚C
0˚C
−30˚C
−40˚C
−55˚C
Typical VO
+303 mV
+675 mV
+919 mV
+1515 mV
+1574 mV
+1863.9 mV
+2205 mV
+2318 mV
+2485 mV
Connection Diagram
TO-92
20004001
See NS Package Number Z03A
Ordering Information
Order
Number
LM19CIZ
Temperature
Accuracy
±3.8˚C
Temperature
Range
−55˚C to +130˚C
NS Package
Number
Z03A
Device
Marking
LM19CIZ
Transport Media
Bulk
www.national.com
2


Features LM19 2.4V, 10µA, TO-92 Temperature Sens or January 2003 LM19 2.4V, 10µA, TO -92 Temperature Sensor General Descrip tion The LM19 is a precision analog out put CMOS integratedcircuit temperature sensor that operates over a −55˚C to +130˚C temperature range. The power s upply operating range is +2.4 V to +5.5 V. The transfer function of LM19 is pr edominately linear, yet has a slight pr edictable parabolic curvature. The accu racy of the LM19 when specified to a pa rabolic transfer function is ±2.5˚C a t an ambient temperature of +30˚C. The temperature error increases linearly a nd reaches a maximum of ±3.8˚C at the temperature range extremes. The temper ature range is affected by the power su pply voltage. At a power supply voltage of 2.7 V to 5.5 V the temperature rang e extremes are +130˚C and −55˚C. De creasing the power supply voltage to 2. 4 V changes the negative extreme to − 30˚C, while the positive remains at +1 30˚C. The LM19’s quiescent current is less than 10 µA. Ther.
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