SOT-23 Temperature Sensor - National Semiconductor
Description
SM73710 2.
7V, SOT-23 Temperature Sensor
SM73710
October 5, 2011
2.
7V, SOT-23 Temperature Sensor
General Description
The SM73710 is a precision integrated-circuit temperature sensor that can sense a −40°C to +125°C temperature range while operating from a single +2.
7V supply.
The SM73710's output voltage is linearly proportional to Celsius (Centigrade) temperature (+6.
25 mV/°C) and has a DC offset of +424 mV.
The offset allows reading negative temperatures without the need for a negative supply.
The nominal output voltage of the SM73710 ranges from +174 mV to +1205 mV for a −40°C to +125°C temperature range.
The SM73710 is calibrated to provide accuracies of ±2.
0°C at room temperature and ±4°C over the full −40°C to +125°C temperature range.
The SM73710's linear output, +424 mV offset, and factory calibration simplify external circuitry required in a single supply environment where reading negative temperatures is required.
Because the SM73710's quiescent current is less than 110 μA, self-heating is limited to a very low 0.
1°C in still air in the SOT-23 package.
Shutdown capability for the SM73710 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates.
Features
■ Renewable Energy Grade ■ Calibrated linear scale factor of +6.
25 mV/°C ■ Rated for full −40°C to +125°C range ■ Suitable for remote applications ■ Available in SOT-23 package
Applications
■ Photovoltaic Electronics ■ Cellular Phones ■ Computers ■ Power Supply Modules ■ Battery Management ■ FAX Machines ■ Printers ■ HVAC ■ Disk Drives ■ Appliances
Key Specifications
■ Accuracy at 25°C: ±3.
0°C (max) ■ Accuracy for −40°C to +125°C: ±4.
0°C (max) ■ Temperature Slope: +6.
25mV/°C ■ Power Supply Voltage Range: +2.
7V to +10V ■ Current Drain @ 25°C: 110μA (max) ■ Nonlinearity: ±0.
8°C (max) ■ Output Impedance: 800Ω (max)
Typical Application
Connection Diagram
SOT-23
VO = (+6.
25 mV/°C × T °C) + 424 mV
Temperature (T) +125°C +100°C +25°C 0°C ...
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