Amplifier and Data Converter Selection Guide (Rev. B

Temperature Sensors83Digital Temperature SensorsTI’s high-accuracy, low-power temperaturesensors are specified for operation from –40°Cto +125°C and are designed for cost-effectivethermal measurement in a variety ofcommunication, computer, consumer,industrial and instrumentation applications.These silicon-based temperature sensors aredesigned on a unique topology that offersexcellent accuracy and linearity overtemperature. Low power and standardcommunication protocol pair nicely withlow-power microcontrollers and batterypowereddesigns.The digital temperature output of the TMPfamily is created using a high-performance,12-bit, delta-sigma ADC that outputstemperatures as a digital word. Programmingand communication with the TMP1xx family ofdevices is done via an I 2 C/2-wire or SPIinterface for easy integration into existingdigital systems.Temperature Sensor CoreA typical block diagram of the TMP family ofdigital temperature sensors is shown below.Temperature is sensed through the die flag ofthe lead frame where the temperature sensingelement is the chip itself, ensuring the mostaccurate temperature information of themonitored area and allowing designers torespond quickly to “over” and “under”thermal conditions.TemperatureSDASCLALERTGND1234DiodeTempSensorA/DConverterOSCTMP175, TMP75ControlLogicSerialInterfaceConfig.and TempRegisterTypical block diagram of the TMP family of digitaltemperature sensors.8765V+A0A1A2Temperature SensorsFeatures of TMP DigitalTemperature Sensors➔Several TMP digital sensors offerprogrammable features, including overandunder-temperature thresholds, alarmfunctions and temperature resolution. Withextremely low power consumption in active(50µA) and standby (0.1µA) modes, theTMP12x family offers as low as 1.5°Cminimum error in a SOT23 package and isan excellent candidate for low-powerthermal monitoring applications.The new TMP105 and TMP106 are theworld’s smallest digital temperaturesensors. Available in a tiny 1mm x 1.5mmchipscale package, they use only 50µA ofcurrent and are ideal for portableapplications including mobile phones,portable media players, digital stillcameras, hard disk drives, laptops, andcomputer accessories. TMP105 has 1.8V to3.0V logic, while TMP106 has 2.7V to5.5V logic.0.5°C, Digital Out Temperature SensorTMP275Get samples, datasheets, evaluation modules and app reports at: www.ti.com/sc/device/TMP275Key Features• 8 addresses• Digital output: two-wire serial interface• Resolution: 9- to 12-bits, user-selectable• Accuracy:±0.5°C (max) from +10°C to +85°C±0.75°C (max) from +0°C to +100°C• Low quiescent current: 50µA, 0.1µA standby• Wide supply range: 2.7V to 5.5V• No power-up sequence required;two-wire bus pull-ups can be enabledbefore V+• Packaging: MSOP-8 and SO-8 packagesApplications• Power-supply temperature monitoring• Computer peripheral terminal protection• Notebook computers• Cell phones• Battery management• Office machines• Thermostat controls• Environmental monitoring and HVAC• Electromechanical device temperatureThe TMP275 is a 0.5°C accurate, two-wire, serial output temperature sensor available in anMSOP-8 or an SO-8 package. The TMP275 is capable of reading temperatures with a resolutionof 0.0625°C. The TMP275 is SMBus-compatible and allows up to eight devices on one bus. It isideal for extended temperature measurement in a variety of communication, computer,consumer, environmental, industrial, and instrumentation applications.The TMP275 is specified for operation over a temperature range of –40°C to +125°C.TemperatureSDASCLALERTGND134DiodeTemp.SensorDSA/DConverterOSCControlLogic2 7TMP275TMP275 functional block diagram.SerialInterfaceConfig.and Temp.Register865V+A0A1A2Texas Instruments 3Q 2007Amplifier and Data Converter Selection Guide