TMP35/TMP36/TMP37 Low Voltage Temperature Sensors …

1 REV. CInformation furnished by Analog Devices is believed to be accurate andreliable. However, no responsibility is assumed by Analog Devices for itsuse, nor for any infringements of patents or other rights of third parties thatmay result from its use. No license is granted by implication or otherwiseunder any patent or patent rights of Analog Technology Way, Box 9106, Norwood, MA 02062-9106, : 781 : 781/326-8703 Analog Devices, Inc., 2002 Low Voltage Temperature SensorsFUNCTIONAL BLOCK DIAGRAM+Vs ( to )VOUTSHUTDOWNTMP35/TMP36/TMP37 PACKAGE TYPES AVAILABLERT-5 (SOT-23)12354 TOP VIEW(Not to Scale)NC = NO CONNECTVOUTSHUTDOWNGNDNC+VSRN-8 (SOIC)12348765 TOP VIEW(Not to Scale)NC = NO CONNECTVOUTSHUTDOWNNCNC+VSNCNCGNDTO-9213 2 BOTTOM VIEW(Not to Scale)PIN 1, +Vs; PIN 2, VOUT; PIN 3, GNDFEATURESLow Voltage Operation ( V to V)Calibrated Directly in C10 mV/ C Scale Factor (20 mV/ C on TMP37) 2 C Accuracy over Temperature (Typ) C Linearity (Typ)Stable with Large Capacitive LoadsSpecified 40 C to +125 C, Operation to +150 CLess than 50 A Quiescent CurrentShutdown Current A MaxLow Self-HeatingAPPLICATIONSE nvironmental Control SystemsThermal ProtectionIndustrial Process ControlFire AlarmsPower System MonitorsCPU Thermal ManagementPRODUCT DESCRIPTIONThe TMP35, TMP36, and TMP37 are low Voltage , precisioncentigrade Temperature Sensors .

2 They provide a Voltage outputthat is linearly proportional to the Celsius (Centigrade) tem-perature. The TMP35/TMP36/TMP37 do not require anyexternal calibration to provide typical accuracies of 1 C at+25 C and 2 C over the 40 C to +125 C Temperature low output impedance of the TMP35/TMP36/TMP37 andits linear output and precise calibration simplify interfacing totemperature control circuitry and A/D converters. All threedevices are intended for single-supply operation from V V maximum. Supply current runs well below 50 A, providingvery low self-heating less than C in still air. In addition, ashutdown function is provided to cut supply current to lessthan TMP35 is functionally compatible with the LM35/LM45 andprovides a 250 mV output at 25 C. The TMP35 reads temperaturesfrom 10 C to 125 C. The TMP36 is specified from 40 C to+125 C, provides a 750 mV output at 25 C, and operates to+125 C from a single V supply.

3 The TMP36 is functionallycompatible with the LM50. Both the TMP35 and TMP36 havean output scale factor of 10 mV/ C. The TMP37 is intended forapplications over the range 5 C to 100 C and provides an outputscale factor of 20 mV/ C. The TMP37 provides a 500 mV outputat 25 C. Operation extends to 150 C with reduced accuracy for alldevices when operating from a 5 V TMP35/TMP36/TMP37 are all available in low cost 3-leadTO-92, SOIC-8, and 5-lead SOT-23 surface-mount C 2 TMP35/TMP36/TMP37 SPECIFICATIONS1(VS = V to V, 40 C TA +125 C, unlessotherwise noted.)ParameterSymbolConditionsMinTypMa xUnitACCURACYTMP35/TMP36/TMP37 FTA = 25 C 1 2 CTMP35/TMP36/TMP37 GTA = 25 C 1 3 CTMP35/TMP36/TMP37 FOver Rated Temperature 2 3 CTMP35/TMP36/TMP37 GOver Rated Temperature 2 4 CScale Factor, TMP3510 C TA 125 CScale Factor, TMP36 40 C TA +125 CScale Factor, TMP375 C TA 85 C5 C TA 100 V +VS VLoad Regulation0 A IL 50 A 40 C TA +105 C620m C/ A 105 C TA +125 C2560m C/ APower Supply Rejection RatioPSRRTA = 25 C30100m V +VS V50m CLong-Term StabilityTA = 150 C for 1 CSHUTDOWNL ogic High Input VoltageVIHVS = Low Input VoltageVILVS = V400mVOUTPUTTMP35 Output VoltageTA = 25 C250mVTMP36 Output VoltageTA = 25 C750mVTMP37 Output VoltageTA = 25 C500mVOutput Voltage Range1002000mVOutput Load CurrentIL050 AShort-Circuit CurrentISCNote 2250 ACapacitive Load DrivingCLNo Oscillations2100010000pFDevice Turn-On TimeOutput within 1 k 100 pF Load2 POWER SUPPLYS upply Range+ CurrentISY (ON)Unloaded50 ASupply Current (Shutdown)ISY (OFF) ANOTES1 Does not consider errors caused by but not subject to change without C 50 LOAD REG m C/ A05010015050302010040 Figure 1.

4 Load Reg vs. Temperature (m C/ A)REV. CTMP35/TMP36/TMP37 3 ABSOLUTE MAXIMUM RATINGS1, 2, 3 Supply Voltage .. 7 VShutdown Pin .. GND SHUTDOWN +VSOutput Pin .. GND VOUT +VSOperating Temperature Range .. 55 C to +150 CDice Junction Temperature .. 175 CStorage Temperature Range .. 65 C to +160 CLead Temperature (Soldering, 60 sec) .. 300 CNOTES1 Stresses above those listed under Absolute Maximum Ratings may cause perma-nent damage to the device. This is a stress rating only; functional operation at orabove this specification is not implied. Exposure to maximum rating conditions forextended periods may affect device reliability. 2 Digital inputs are protected; however, permanent damage may occur on unpro-tected units from high energy electrostatic fields. Keep units in conductive foamor packaging at all times until ready to use. Use proper antistatic handlingprocedures.

5 3 Remove power before inserting or removing units from their Type JA JCUnitTO-92 (T9 Suffix)162120 C/WSOIC-8 (S Suffix)15843 C/WSOT-23 (RT Suffix)300180 C/W JA is specified for device in socket (worst-case conditions).ORDERING GUIDEA ccuracyLinearat 25 COperatingPackageModel( C max) Temperature RangeOptions1 TMP35FT9 C to 125 CTO-92 TMP35GT9 C to 125 CTO-92 TMP35FS C to 125 CRN-8 TMP35GS C to 125 CRN-8 TMP35 GRT2 C to 125 CRT-5 TMP36FT9 40 C to +125 CTO-92 TMP36GT9 40 C to +125 CTO-92 TMP36FS 40 C to +125 CRN-8 TMP36GS 40 C to +125 CRN-8 TMP36 GRT2 40 C to +125 CRT-5 TMP37FT9 C to 100 CTO-92 TMP37GT9 C to 100 CTO-92 TMP37FS C to 100 CRN-8 TMP37GS C to 100 CRN-8 TMP37 GRT2 C to 100 CRT-5 NOTES1 SOIC = Small Outline Integrated Circuit; RT = Plastic Surface Mount;TO = factory for DESCRIPTIONAn equivalent circuit for the TMP3x family of micropower,centigrade Temperature Sensors is shown in Figure 2.

6 At theheart of the Temperature sensor is a band gap core, which iscomprised of transistors Q1 and Q2, biased by Q3 to approxi-mately 8 A. The band gap core operates both Q1 and Q2 at thesame collector current level; however, since the emitter area ofQ1 is 10 times that of Q2, Q1 s VBE and Q2 s VBE are not equalby the following relationship: VBE=VT lnAE,Q1AE,Q2 SHDN+VOUT+VS3X25 AQ32 XGNDQ4Q110X6 XFigure 2. Temperature Sensor SimplifiedEquivalent CircuitResistors R1 and R2 are used to scale this result to produce theoutput Voltage transfer characteristic of each Temperature sensorand, simultaneously, R2 and R3 are used to scale Q1 s VBE asan offset term in VOUT. Table I summarizes the differencesbetween the three Temperature Sensors output I. TMP3x Output CharacteristicsOffsetOutput VoltageOutput VoltageSensorVoltage (V)Scaling (mV/ C)@ 25 C (mV) output Voltage of the Temperature sensor is available at theemitter of Q4, which buffers the band gap core and providesload current drive.

7 Q4 s current gain, working with the availablebase current drive from the previous stage, sets the short-circuitcurrent limit of these devices to 250 (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readilyaccumulate on the human body and test equipment and can discharge without detection. Althoughthe TMP35/TMP36/TMP37 features proprietary ESD protection circuitry, permanent damagemay occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESDprecautions are recommended to avoid performance degradation or loss of !ESD SENSITIVE DEVICEREV. CTMP35/TMP36/TMP37 4 Temperature 50 250255075100125 OUTPUT Voltage Vabca. TMP35b. TMP36c. TMP37VS = 3 VTPC 1. Output Voltage vs. Temperaturea. MAXIMUM LIMIT (G GRADE)b. TYPICAL ACCURACY ERRORc. MINIMUM LIMIT (G GRADE) Temperature C2 510 1 2 3 4345020406080100120140abcACCURACY ERROR CTPC 2.

8 Accuracy Error vs. TemperatureTEMPERATURE 50125 SUPPLY REJECTION C/VV+ = 3V to , NO LOADTPC 3. Power Supply Rejection vs. TemperatureFREQUENCY SUPPLY REJECTION C/VTPC 4. Power Supply Rejection vs. FrequencyTEMPERATURE C430215 50125 250255075100 MINIMUM SUPPLY Voltage VbaMINIMUM SUPPLY Voltage REQUIRED TO MEETDATA SHEET SPECIFICATIONNO LOADa. TMP35/TMP36b. TMP37 TPC 5. Minimum Supply Voltage vs. TemperatureSUPPLY CURRENT ATEMPERATURE C504010302060 50125 250255075100NO LOADbaa. V+ = 5Vb. V+ = 3 VTPC 6. Supply Current vs. Temperature Typical Performance CharacteristicsREV. CTMP35/TMP36/TMP37 5 SUPPLY Voltage V4030020105007123456 SUPPLY CURRENT ATA = 25 C, NO LOAD8 TPC 7. Supply Current vs. Supply VoltageTEMPERATURE C40300201050 50125 250255075100a. V+ = 5Vb. V+ = 3 VNO LOADab SUPPLY CURRENT nATPC 8. Supply Current vs. Temperature (Shutdown = 0 V) Temperature C4003000200100 50125 250255075100= V+ AND SHUTDOWN PINS LOW TO HIGH (0V TO 3V) VOUT SETTLES WITHIN 1 C= V+ AND SHUTDOWN PINS HIGH TO LOW (3V TO 0V)RESPONSE TIME sTPC 9.

9 VOUT Response Time for V+ Power-Up/Power-Down vs. TemperatureTEMPERATURE C4003000200100 50125 250255075100= SHUTDOWN PIN HIGH TO LOW (3V TO 0V)= SHUTDOWN PIN LOW TO HIGH (0V TO 3V) VOUT SETTLES WITHIN 1 CRESPONSE TIME sTPC 10. VOUT Response Time for Shutdown Pin 50250010050150200300350400450 OUTPUT Voltage + = 3 VSHUTDOWN =SIGNALTA = 25CV+ AND SHUTDOWN =TA = 25 CSIGNALTPC 11. VOUT Response Time to Shutdown and V+Pins vs. TimeTIME sec7006050403020108090100110010020030040 0500600abcVIN = 3V, 5 VPERCENT OF CHANGE %a. TMP35 SOIC SOLDERED TO " x " Cu PCBb. TMP36 SOIC SOLDERED TO " x " Cu PCBc. TMP35 TO-92 IN SOCKET SOLDERED TO 1" x " Cu PCBTPC 12. Thermal Response Time in Still AirREV. CTMP35/TMP36/TMP37 6 AIR VELOCITY FPM0604020801401001200100200300400500600 TIME CONSTANT secabca. TMP35 SOIC SOLDERED TO " x " Cu PCBb. TMP36 SOIC SOLDERED TO " x " Cu PCc.

10 TMP35 TO-92 IN SOCKET SOLDERED TO 1" x " Cu PCBVIN = 3V, 5V700 TPC 13. Thermal Response Time Constant in Forced AirTIME sec7006050403020108090100110010203040506 0abcCHANGE %VIN = 3V, 5Va. TMP35 SOIC SOLDERED TO " x " Cu PCBb. TMP36 SOIC SOLDERED TO " x " Cu PCBc. TMP35 TO-92 IN SOCKET SOLDERED TO 1" x " Cu PCBTPC 14. Thermal Response Time in Stirred Oil Bath100%100901ms10mVTIME/DIVISIONVOLT/DI VISIONTPC 15. Temperature Sensor Wideband OutputNoise Voltage . Gain = 100, BW = 157 kHzabFREQUENCY Hz2400100001010k1001k2200200016001800140 01200800600400200a. TMP35/36b. TMP37 Voltage NOISE DENSITY nV/ HzTPC 16. Voltage Noise Spectral Density vs. FrequencyREV. CTMP35/TMP36/TMP37 7 APPLICATIONS SECTIONS hutdown OperationAll TMP3x devices include a shutdown capability that reduces thepower supply drain to less than A maximum. This feature,available only in the SOIC-8 and the SOT-23 packages, is TTL/CMOS level compatible, provided that the Temperature sensorsupply Voltage is equal in magnitude to the logic supply to the TMP3x at the SHUTDOWN pin, a pull-up currentsource to VIN is connected.