NCT210: 2-Channel Digital Thermometer with Under/Overtemperature Alarm

The NCT210 is a two-channel digital thermometer and over/undertemperature alarm, intended for use in personal computers and other systems requiring thermal monitoring and management. The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which can be provided on-chip with the processor, or can be a low cost discrete NPN/PNP device, such as the 2N3904/2N3906. A novel measurement technique cancels out the absolute value of the transistor's base emitter voltage so that no calibration is required. The second measurement channel measures the output of an on-chip temperature sensor to monitor the temperature of the device and its environment. The NCT210 commumicates over a two-wire serial interface compatible with SMBus standards. Under/overtemperature limits can be programmed into the device over the serial bus, and an /ALERT output signals when the on-chip or remote temperature is out of range. This output can be used as an interrupt or as an SMBus alert.

Features
  • Alternative to the ADM1021A
  • On-Chip and Remote Temperature Sensing
  • No Calibration Necessary
  • 1°C Accuracy for On-Chip Sensor
  • 3°C Accuracy for the Remote Sensor
  • Programmable Over/Undertemperature Limits
  • Programmable Conversion rate
  • 2-Wire SMBus Serial Interface
  • Supports System Management Bus (SMBus) Alert
  • 1 µA Standby Current
  • 3.0 V to 5.5 V Supply
Applications
  • Thermal Management
  • Temperature Sensing
End Products
  • Smart Electric Meters
  • DSL Line Cards
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
2-Channel Digital Thermometer with Under/Overtemperature AlarmNCT210/D (184.0kB)2
Package Drawings (1)
Document TitleDocument ID/SizeRevision
QSOP-16492-01 (58.5kB)A
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCT210RQR2GActivePb-free Halide freeQSOP-16492-011Tape and Reel2500Contact BDTIC
Specifications
ProductSensor TypeData Transmission StandardICC Max (mA)VCC Min (V)VCC Max (V)T Min (°C)T Max (°C)Temperature Error (°C)
NCT210RQR2GLocal & RemoteSMBus0.3735.5-65125±3
2-Channel Digital Thermometer with Under/Overtemperature Alarm (184.0kB) NCT210
QSOP-16 CM2009
NCT210