The NCT275 is a two-wire serially programmable temperature

sensor with an over-temperature/interrupt output pin to signal out of

limit conditions. This is an open-drain pin and can operate in either

comparator or interrupt mode. Temperature measurements are

converted into digital form using a high resolution (12 bit),

sigma-delta, analog-to-digital converter (ADC). The device operates

over the –55°C to +125°C temperature range.

Communication with the NCT275 is accomplished via the

SMBus/I2C interface which is compatible with industry standard

protocols. Through this interface the NCT275s internal registers may

be accessed. These registers allow the user to read the current

temperature, change the configuration settings and adjust the

temperature limits.

The NCT275 has a wide supply voltage range of 3.0 V to 5.5 V. The

average supply current is 575 A at 3.3 V. It also offers a shutdown

mode to conserve power. The typical shutdown current is 3 A.

The NCT275 is available in a space saving 6 ball CSP package as

NCT275A and NCT275B. NCT275B gives I2C address options of

0x48 and 0x4A while NCT275A gives address options of 0x49 and

0x4B. NCT275 is also fully register compatible with the NCT75,

LM75 and TMP75.

Features

• 12-bit Temperature-to-Digital Converter

• Input Voltage Range from 3.0 V to 5.5 V

• Temperature Range from -55°C to +125°C

• SMBus/I2C Interface

• Over Temperature Indicator

• Support for SMBus ALERT

• Shutdown Mode for Low Power Consumption

• One-Shot Mode

• Available in 6 Ball CSP Package with Multiple Address Options

• These are Pb-Free Devices

Typical Applications

• Computer Thermal Monitoring

• Thermal Protection

• Isolated Sensors

• Battery Management

• Office Electronics

• Electronic Test Equipment

• Thermostat Controls

• System Thermal Management