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TMP36FS Datasheet(PDF) 3 Page - Analog Devices |
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TMP36FS Datasheet(HTML) 3 Page - Analog Devices |
3 / 16 page REV. C TMP35/TMP36/TMP37 –3– ABSOLUTE MAXIMUM RATINGS 1, 2, 3 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Shutdown Pin . . . . . . . . . . . . . . GND ≤ SHUTDOWN ≤ +VS Output Pin . . . . . . . . . . . . . . . . . . . . . . GND VOUT +VS Operating Temperature Range . . . . . . . . . . –55 °C to +150°C Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 175 °C Storage Temperature Range . . . . . . . . . . . . –65 °C to +160°C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300 °C NOTES 1Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only; functional operation at or above this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. 2Digital inputs are protected; however, permanent damage may occur on unpro- tected units from high energy electrostatic fields. Keep units in conductive foam or packaging at all times until ready to use. Use proper antistatic handling procedures. 3Remove power before inserting or removing units from their sockets. Package Type JA JC Unit TO-92 (T9 Suffix) 162 120 °C/W SOIC-8 (S Suffix) 158 43 °C/W SOT-23 (RT Suffix) 300 180 °C/W θ JA is specified for device in socket (worst-case conditions). ORDERING GUIDE Accuracy Linear at 25 C Operating Package Model ( C max) Temperature Range Options1 TMP35FT9 ±2.0 10 °C to 125°C TO-92 TMP35GT9 ±3.0 10 °C to 125°C TO-92 TMP35FS ±2.0 10 °C to 125°C RN-8 TMP35GS ±3.0 10 °C to 125°C RN-8 TMP35GRT 2 ±3.0 10 °C to 125°C RT-5 TMP36FT9 ±2.0 –40 °C to +125°C TO-92 TMP36GT9 ±3.0 –40 °C to +125°C TO-92 TMP36FS ±2.0 –40 °C to +125°C RN-8 TMP36GS ±3.0 –40 °C to +125°C RN-8 TMP36GRT 2 ±3.0 –40 °C to +125°C RT-5 TMP37FT9 ±2.0 5 °C to 100°C TO-92 TMP37GT9 ±3.0 5 °C to 100°C TO-92 TMP37FS ±2.0 5 °C to 100°C RN-8 TMP37GS ±3.0 5 °C to 100°C RN-8 TMP37GRT 2 ±3.0 5 °C to 100°C RT-5 NOTES 1SOIC = Small Outline Integrated Circuit; RT = Plastic Surface Mount; TO = Plastic. 2Consult factory for availability. FUNCTIONAL DESCRIPTION An equivalent circuit for the TMP3x family of micropower, centigrade temperature sensors is shown in Figure 2. At the heart of the temperature sensor is a band gap core, which is comprised of transistors Q1 and Q2, biased by Q3 to approxi- mately 8 µA. The band gap core operates both Q1 and Q2 at the same collector current level; however, since the emitter area of Q1 is 10 times that of Q2, Q1’s VBE and Q2’s VBE are not equal by the following relationship: ∆V BE =V T × ln AE,Q1 AE,Q2 SHDN +VOUT +VS 3X 25 A 2X Q2 1X R1 R2 R3 7.5 A Q3 2X GND Q4 Q1 10X 6X Figure 2. Temperature Sensor Simplified Equivalent Circuit Resistors R1 and R2 are used to scale this result to produce the output voltage transfer characteristic of each temperature sensor and, simultaneously, R2 and R3 are used to scale Q1’s VBE as an offset term in VOUT. Table I summarizes the differences between the three temperature sensors’ output characteristics. Table I. TMP3x Output Characteristics Offset Output Voltage Output Voltage Sensor Voltage (V) Scaling (mV/ C) @ 25 C (mV) TMP35 0 10 250 TMP36 0.5 10 750 TMP37 0 20 500 The output voltage of the temperature sensor is available at the emitter of Q4, which buffers the band gap core and provides load current drive. Q4’s current gain, working with the available base current drive from the previous stage, sets the short-circuit current limit of these devices to 250 µA. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the TMP35/TMP36/TMP37 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE |
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