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NCT1008 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCT1008 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 20 page  © Semiconductor Components Industries, LLC, 2010 August, 2010 − Rev. 3 1 Publication Order Number: NCT1008/D NCT1008 +15C Temperature Monitor with Series Resistance Cancellation The NCT1008 is a dual−channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and thermal management systems. It is register−compatible with the ADM1032 and ADT7461. A feature of the NCT1008 is series resistance cancellation, where up to 1.5 k W (typical) 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. 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 • Series Resistance Cancellation Up to 1.5 kW • Extended, Switchable Temperature Measurement Range 0 °C to +127°C (Default) or –64°C to +191°C • Register−Compatible with ADM1032 and ADT7461 • Remote THERM Limit of 108°C • 2−Wire SMBus/I2C Serial Interface with SMBus Alert Support • Programmable Over/Undertemperature Limits • Offset Registers for System Calibration • Up to Two Overtemperature Fail−Safe THERM Outputs • Small 8−Lead DFN • 240 mA Operating Current, 5 mA Standby Current • Compatible with 1.8 V Logic • Pb−Free Packages are Available Applications • Smart Phones • Desktop and Notebook Computers • Smart Batteries • Automotive • Embedded Systems MARKING DIAGRAMS http://onsemi.com PIN ASSIGNMENT GND ALERT/THERM2 THERM 1 2 3 4 8 7 6 5 (Top View) DFN8 CASE 506BJ SCLK SDATA See detailed ordering and shipping information in the package dimensions section on page 18 of this data sheet. ORDERING INFORMATION NCT 1008x ALYWG G 1 8 8x = Device Code (Where x = C or D) M = Date Code G = Pb−Free Package x = C or D A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package (Note: Microdot may be in either location) 1 WDFN8 CASE 511AT D+ D− VCC 1 8xMG G 1 |
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