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