SM72480SDE-120/NOPB National Semiconductor, SM72480SDE-120/NOPB Datasheet - Page 11

• Manufacturer Part Number: SM72480SDE-120/NOPB
• Description: "1.6V, Temp Sensor-Solar
• Manufacturer: National Semiconductor

Specifications of SM72480SDE-120/NOPB

• Temperature Sensor Function: Temp Sensor
• Output Type: Analog
• Package Type: LLP EP
• Operating Temperature (min): -50C
• Operating Temperature (max): 150C
• Operating Temperature Classification: Automotive
• Operating Supply Voltage (typ): 1.8/2.5/3.3/5V
• Operating Supply Voltage (max): 5.5V
• Ic Output Type: Analog
• Temperature Sensing Range: -50°C To +150°C
• Supply Current: 8µA
• Supply Voltage Range: 1.6V To 5.5V
• Sensor Case Style: LLP
• No. Of Pins: 6
• Leaded Process Compatible: Yes
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Compliant

1.1 V
The SM72480's V
ear. The Conversion Table above and the equation in Section
1.1.1 represent the most accurate typical performance of the
V
1.1.1 The Second-Order Equation (Parabolic)
The data from the Conversion Table, or the equation below,
when plotted, has an umbrella-shaped parabolic curve.
V
TEMP
TEMP
Die Temp.,
TEMP
voltage output vs Temperature.
is in mV.
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
°C
vs DIE TEMPERATURE APPROXIMATIONS
TEMP
V
TEMP
125 or 120°C
analog temperature output is very lin-
T
, Analog Output Voltage, mV
TRIP
756
745
734
724
713
702
691
681
670
659
649
638
627
616
606
595
584
573
562
552
=
T
TRIP
567
559
551
543
535
527
519
511
503
495
487
479
471
463
455
447
438
430
422
414
= 105°C
11
1.1.2 The First-Order Approximation (Linear)
For a quicker approximation, although less accurate than the
second-order, over the full operating temperature range the
linear formula below can be used. Using this formula, with the
constant and slope in the following set of equations, the best-
fit V
with an approximation error less than 18 mV. V
1.1.3 First-Order Approximation (Linear) over Small
Temperature Range
For a linear approximation, a line can easily be calculated
over the desired temperature range from the Conversion Ta-
ble using the two-point equation:
Where V is in mV, T is in °C, T
the lowest temperature, T
highest temperature.
Using this method of linear approximation, the transfer func-
tion can be approximated for one or more temperature ranges
of interest.
TEMP
vs Die Temperature performance can be calculated
2
and V
1
and V
2
are the coordinates of the
1
are the coordinates of
TEMP
www.national.com
is in mV.