±0.5°C Accurate, 10-Bit Digital Temperature Sensors in SOT-23

The AD7414/AD7415 are complete temperature monitoring systems in 6-lead and 5-lead SOT-23 packages. They contain a band gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25°C.

The AD7414/AD7415 provide a 2-wire serial interface that is compatible with SMBus and I2C interfaces. The parts come in three versions: the AD7414/AD7415-0, AD7414/AD7415-1, and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1 versions provide a choice of three different SMBus addresses for each version. All four AD7414 versions give the possibility of eight different I2C addresses while the two AD7415 versions allow up to six I2C addresses to be used.

The AD7414/AD7415’s 2.7 V supply voltage, low supply current, serial interface, and small package size make them ideal for a variety of applications, including personal computers, office equipment, cellular phones, and domestic appliances.

In the AD7414, on-chip registers can be programmed with high and low temperature limits, and an open-drain overtemperature indicator output (ALERT) becomes active when a programmed limit is exceeded. A configuration register allows programming of the state of the ALERT output (active high or active low). This output can be used as an interrupt or as an SMBus alert.

APPLICATIONS

* Hard disk drives and personal computers

* Electronic test equipment and office equipment

* Domestic appliances and cellular phones

* Process control

* 10-bit temperature-to-digital converter

* Temperature range: −40°C to +125°C

* Typical accuracy of ±0.5°C at +40°C

* SMBus/I2C®-compatible serial interface

* 3 μA power-down current

* Temperature conversion time: 29 μs typ

* Space-saving 6-lead (AD7414) and 5-lead (AD7415)