Thermostats Digital Thermometer and Memory

Thermostats

Thermostats

10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs

SPI-/I2C-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC

2-Terminal IC Temperature Transducer Features: Linear current output: 1 µA/K Wide temperature range: -55°C to +150°C Probe compatible ceramic sensor package 2-terminal device: voltage in/current out Laser trimmed to ±0.5°C calibration accuracy (AD590M) Excellent linearity: ±0.3°C over full range (AD590M) Wide power supply range: 4 V to 30 V Sensor isolation from case Available in 2-lead FLATPACK, 4-lead LFCSP, 3-pin TO-52, 8-lead SOIC, and die form

Thermostats SERIAL DIGITAL OUTPUT THERMOMETER

The AD7814 is a complete temperature monitoring system in aSOT-23 package or 8-lead MSOP package. It contains a bandgap temperature sensor and 10-bit ADC to monitor and digitizethe temperature reading to a resolution of 0.25°CThe AD7814 has a flexible serial interface that allows easy interfacing to most microcontrollers. The interface is compatiblewith SPI®, QSPI™, and MICROWIRE™ protocol, and is alsocompatible with DSPs. The part features a standby mode that iscontrolled via the serial interface.The AD7814’s wide supply voltage range, low supply current,and SPI-compatible interface make it ideal for a variety ofapplications, including personal computers, office equipment,and domestic appliances.PRODUCT HIGHLIGHTS The AD7814 has an on-chip temperature sensor that allows an accurate measurement of the ambient temperature. The measurable temperature range is –55°C to +125°C, with a ±2°C temperature accuracy. Supply voltage of 2.7 V to 5.5 V Space-saving 6-lead SOT-23 package and 8-lead MSOP package 10-bit temperature reading to 0.25°C resolution Standby mode that reduces the current consumption to 1 µAAPPLICATIONS Hard Disk Drives Personal Computers Electronic Test Equipment Office Equipment Domestic Appliances Process Control

The TMP35/TMP36/TMP37 are low voltage, precision centigrade temperature sensors. They provide a voltage output that is linearly proportional to the Celsius (centigrade) temperature. The TMP35/ TMP36/TMP37 do not require any external calibration to provide typical accuracies of ±1°C at +25°C and ±2°C over the −40°C to +125°C temperature range.The low output impedance of the TMP35/TMP36/TMP37 and its linear output and precise calibration simplify interfacing to temperature control circuitry and ADCs. All three devices are intended for single-supply operation from 2.7 V to 5.5 V maximum. The supply current runs well below 50 μA, providing very low self-heating—less than 0.1°C in still air. In addition, a shutdown function is provided to cut the supply current to less than 0.5 μA.The TMP35 is functionally compatible with the LM35/LM45 and provides a 250 mV output at 25°C. The TMP35 reads temperatures from 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 2.7 V supply. The TMP36 is functionally compatible with the LM50. Both the TMP35 and TMP36 have an output scale factor of 10 mV/°C.The TMP37 is intended for applications over the range of 5°C to 100°C and provides an output scale factor of 20 mV/°C. The TMP37 provides a 500 mV output at 25°C. Operation extends to 150°C with reduced accuracy for all devices when operating from a 5 V supply.The TMP35/TMP36/TMP37 are available in low cost 3-lead TO-92, 8-lead SOIC_N, and 5-lead SOT-23 surface-mount packages.

The ADT74701 controller is a multichannel temperature sensor and PWM fan controller and fan speed monitor for systems requiring active cooling. It is designed to interface directly to an I2C® bus. The ADT7470 can monitor up to 10 daisy-chained TMP05 temperature sensors. It can also monitor and control the speed of four fans, in automatic or in manual control loops.A FULL_SPEED input is provided to allow the fans to be blasted to maximum speed, via external hardware control, under extreme thermal conditions or on system startup. An SMBALERT interrupt communicates error conditions such as fan under speed and over temperature measurements to the system service processor. Individual error conditions can then be read from status registers over the I2C bus.APPLICATIONS Servers Networking and telecommunications equipment Desktops