NCT1008 Series

±1°C Digital Temperature Sensor with Series Resistance Cancellation

Catalog

±1°C Digital Temperature Sensor with Series Resistance Cancellation

Part	Voltage - Supply [Min]	Voltage - Supply [Max]	Sensing Temperature - Remote [Max]	Sensing Temperature - Remote [Min]	Package / Case	Resolution	Supplier Device Package	Features	Mounting Type	Accuracy - Highest (Lowest)	Sensing Temperature - Local [Max]	Sensing Temperature - Local [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Test Condition [Min]	Test Condition [Max]
ON Semiconductor NCT1008DMT3R2G	2.8 V	3.6 V	191 °C	-64 °C	8-WFDFN	8 b	8-WDFN (2x2)	One-Shot Output Switch Programmable Limit Shutdown Mode Standby Mode	Surface Mount	2.5 °C	125 °C	-40 °C	125 °C	-40 °C	I2C/SMBus	-20 °C	230 °F
ON Semiconductor NCT1008CMT3R2G	2.8 V	3.6 V	191 °C	-64 °C	8-WFDFN	8 b	8-WDFN (2x2)	One-Shot Output Switch Programmable Limit Shutdown Mode Standby Mode	Surface Mount	2.5 °C	125 °C	-40 °C	125 °C	-40 °C	I2C/SMBus	-20 °C	230 °F
ON Semiconductor NCT1008CMN3R2G	2.8 V	3.6 V	191 °C	-64 °C	8-VFDFN Exposed Pad	8 b	8-DFN (3x3)	One-Shot Output Switch Programmable Limit Shutdown Mode Standby Mode	Surface Mount	2.5 °C	125 °C	-40 °C	125 °C	-40 °C	I2C/SMBus	-20 °C	230 °F

Catalog

±1°C Digital Temperature Sensor with Series Resistance Cancellation

Key Features

• On-chip and remote temperature sensor

• 0.25°C resolution/1°C accuracy on remote channel

• 1°C resolution/1°C accuracy on local channel

• Automatically cancels up to 1.5 kΩ (typical) of resistance in series with remote diode to allow noise filtering

• Extended, switchable temperature measurement range 0°C to +127°C (default) or 64°C to +191°C

• 2-wire SMBus serial interface with SMBus alert support

• Programmable over/under temperature limits

• Offset registers for system calibration

• Up to two overtemperature fail-safe THERM outputs

• Remote THERM Limit of 108°C

• Compatible with 1.8 V Logic

Description

The NCT1008 is a dual-channel digital temperature sensor intended for use in elevated thermal density applications. A feature of the NCT1008 is series resistance cancellation, where up to 1.5 kΩ of resistance in series with the temperature monitoring diode can be automatically cancelled from the temperature result, allowing noise filtering. The NCT1008 has a configurable ALERT output and an extended, switchable temperature measurement range. The NCT1008 can measure the temperature of a remote thermal diode accurate to ±1°C and the ambient temperature accurate to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the ADM1032, but it can be switched to a wider measurement range of -64°C to +191°C. The NCT1008 communicates over a 2-wire serial interface, compatible with system management bus (SMBus/I2C) standards. The default SMBus/I2C address of the NCT1008 is 0x4C. An NCT1008D is available with an SMBus/I2C address of 0x4D. This is useful if more than one NCT1008 is used on the same SMBus/I2C. An ALERT output signals when the on-chip or remote temperature is out of range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output, if required.