NCT375 Industry Standard Digital Temperature Sensor with 2wire Interface The NCT375 is a two-wire serially programmable temperature sensor with an over-temperature/interrupt output pin to signal out of www.onsemi.com 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 (12bit), sigma-delta, analog-to-digital converter (ADC). The device operates over the 55C to +125C temperature range. DFN8 SOIC8 Micro8 Communication with the NCT375 is accomplished via the CASE 506AA CASE 751 CASE 846A 2 SMBus/I C interface. Three address selection pins, A2, A1 and A0, can be used to connect up to 8 NCT375s to a single bus. Through this PIN ASSIGNMENT interface the NCT375s internal registers may be accessed. These registers allow the user to read the current temperature, change the SDA 1 8 V DD configuration settings and adjust the temperature limits. 2 7 SCL A0 The NCT375 has a wide supply voltage range of 3.0 V to 5.5 V. The (Top View) OS/ALERT 3 6 A1 average supply current is 575 A at 3.3 V. It also offers a shutdown GND 4 5 A2 mode to conserve power. The typical shutdown current is 3 A. The NCT375 is available in three, space saving packages 8-lead DFN, 8-lead Micro8 and 8-lead SOIC and is also fully pin and register compatible with the NCT75, LM75 and TCN75. MARKING DIAGRAMS Features 8 12-bit Temperature-to-Digital Converter 1 T375 35M Input Voltage Range from 3.0 V to 5.5 V AYW Temperature Range from 55C to +125C 1 2 SMBus/I C Interface DFN8 Micro8 Overtemperature Indicator M = Date Code Support for SMBus/ALERT A = Assembly Location Shutdown Mode for Low Power Consumption Y = Year W = Work Week One-shot Mode = Pb-Free Package Available in 8-pin DFN, 8-pin Micro8 and SOIC Packages (Note: Microdot may be in either location) These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS 8 Compliant NCT375 Applications ALYW Computer Thermal Monitoring 1 Thermal Protection SOIC8 Isolated Sensors A = Assembly Location Battery Management L = Wafer Lot Office Electronics Y = Year Electronic Test Equipment W = Work Week = Pb-Free Package Thermostat Controls System Thermal Management ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 13 of this data sheet. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: June, 2015 Rev. 0 NCT375/DNCT375 8 V DD 1 SDA 2 SCL REGISTERS TWO-WIRE CONFIGURATION T 5 HYST INTERFACE A2 3 6 TEMPERATURE T OS A1 7 ONE-SHOT A0 OS/ALERT DELTA-SIGMA CONTROL ADC LOGIC 4 GND Figure 1. Simplified Block Diagram V 3.0 V To 5.5 V DD C BYPASS 5 A2 6 ADDRESS A1 (SET AS DESIRED) 1 7 SDA A0 NCT375 SERIAL INTERFACE 2 SCL 3 OS/ALERT NOTE: SDA, SCL AND OS/ALERT PINS REQUIRE PULL-UP RESISTORS TO V DD 4 GND Figure 2. Typical Application Circuit Table 1. PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 2 1 SDA SMBus/I C Serial Bi-directional Data Input/Output. Open-drain pin needs a pull-up resistor. 2 SCL Serial Clock Input. Open-drain pin needs a pull-up resistor. 3 OS/ALERT Over-temperature Indicator. Open-drain output needs a pullup resistor. Active Low output. 4 GND Power Supply Ground. 2 2 5 A2 SMBus/I C Serial Bus Address Selection Pin. Connect to GND or V to set the desired I C address. DD 2 2 6 A1 SMBus/I C Serial Bus Address Selection Pin. Connect to GND or V to set the desired I C address. DD 2 2 7 A0 SMBus/I C Serial Bus Address Selection Pin. Connect to GND or V to set the desired I C address. DD 8 V Positive Supply Voltage, 3.0 V to 5.5 V. Bypass to ground with a 0.1 F bypass capacitor. DD www.onsemi.com 2