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LM61_05 Datasheet

  • LM61_05

  • National Semiconductor [2.7V, SOT-23 or TO-92 Temperature S...

  • NSC

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LM61 2.7V, SOT-23 or TO-92 Temperature Sensor
August 2005
LM61
2.7V, SOT-23 or TO-92 Temperature Sensor
General Description
The LM61 is a precision integrated-circuit temperature sen-
sor that can sense a 鈭?0藲C to +100藲C temperature range
while operating from a single +2.7V supply. The LM61鈥檚
output voltage is linearly proportional to Celsius (Centigrade)
temperature (+10 mV/藲C) and has a DC offset of +600 mV.
The offset allows reading negative temperatures without the
need for a negative supply. The nominal output voltage of the
LM61 ranges from +300 mV to +1600 mV for a 鈭?0藲C to
+100藲C temperature range. The LM61 is calibrated to pro-
vide accuracies of
鹵
2.0藲C at room temperature and
鹵
3藲C
over the full 鈭?5藲C to +85藲C temperature range.
The LM61鈥檚 linear output, +600 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading negative temperatures is re-
quired. Because the LM61鈥檚 quiescent current is less than
125 碌A(chǔ), self-heating is limited to a very low 0.2藲C in still air.
Shutdown capability for the LM61 is intrinsic because its
inherent low power consumption allows it to be powered
directly from the output of many logic gates.
Applications
n
n
n
n
n
n
n
n
n
Cellular Phones
Computers
Power Supply Modules
Battery Management
FAX Machines
Printers
HVAC
Disk Drives
Appliances
Key Specifications
j
Accuracy at 25藲C
j
Accuracy for 鈭?0藲C to +100藲C
j
Accuracy for 鈭?5藲C to +85藲C
j
Temperature Slope
j
Power Supply Voltage Range
j
Current Drain
@
25藲C
j
Nonlinearity
j
Output Impedance
鹵
2.0 or
鹵
3.0藲C
(max)
鹵
4.0藲C (max)
鹵
3.0藲C (max)
+10 mV/藲C
+2.7V to +10V
125 碌A(chǔ) (max)
Features
n
n
n
n
Calibrated linear scale factor of +10 mV/藲C
Rated for full 鈭?0藲 to +100藲C range
Suitable for remote applications
UL Recognized Component
鹵
0.8藲C (max)
800
鈩?/div>
(max)
Typical Application
01289702
V
O
= (+10 mV/藲C x T 藲C) + 600 mV
Temperature (T)
+100藲C
+85藲C
+25藲C
0藲C
鈭?5藲C
鈭?0藲C
Typical V
O
+1600 mV
+1450 mV
+850 mV
+600 mV
+350 mV
+300 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor (鈭?0藲C to +100藲C)
Operating from a Single Li-Ion Battery Cell
漏 2005 National Semiconductor Corporation
DS012897
www.national.com

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