NCT1008CMN3R2G ON Semiconductor, NCT1008CMN3R2G Datasheet
NCT1008CMN3R2G
Specifications of NCT1008CMN3R2G
Available stocks
Related parts for NCT1008CMN3R2G
NCT1008CMN3R2G Summary of contents
Page 1
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 register−compatible with the ADM1032 and ADT7461. A feature of the NCT1008 ...
Page 2
ON−CHIP CONVERSION RATE TEMPERATURE REGISTER SENSOR LOCAL TEMPERATURE VALUE REGISTER A−TO− ANALOG CONVERTER MUX D– 3 BUSY RUN/STANDBY REMOTE TEMPERATURE VALUE REGISTER REMOTE OFFSET REGISTER EXTERNAL DIODE OPEN−CIRCUIT NCT1008 GND DD ABSOLUTE MAXIMUM RATINGS Parameter ...
Page 3
PIN ASSIGNMENT Pin No. Mnemonic 1 V Positive Supply Positive Connection to Remote Temperature Sensor. 3 D− Negative Connection to Remote Temperature Sensor. 4 THERM Open−Drain Output. Can be used to turn ...
Page 4
ELECTRICAL CHARACTERISTICS Parameter Power Supply Supply Voltage Average Operating Supply Current Undervoltage Lockout Threshold Power−On Reset Threshold Temperature−To−Digital Converter Local Sensor Accuracy 3 3.6 V Local Sensor Accuracy 2 3.6 V Resolution ...
Page 5
DEV 1 DEV 8 DEV 15 3.0 DEV 2 DEV 9 DEV 16 DEV 3 DEV 10 MEAN DEV 4 DEV 11 HIGH 4 R 2.5 R DEV 5 DEV 12 LOW 4 DEV 6 DEV 13 2.0 DEV ...
Page 6
DEV 4 3.6 3.4 3.2 3.0 3.0 3.1 3.2 3.3 3.4 V (V) DD Figure 9. Standby Supply Current vs. Voltage 25 20 100mV 15 10 50mV 5 20mV 0 0 100 200 300 400 NOISE ...
Page 7
Theory of Operation The NCT1008 is a local and remote temperature sensor and over/under temperature alarm, with the added ability to automatically cancel the effect of 1.5 kW (typical) of resistance in series with the temperature monitoring diode. When the ...
Page 8
REMOTE SENSING TRANSISTOR D– Temperature Measurement Results The results of the local and remote temperature measurements are stored in the local and remote temperature value registers and compared with limits programmed into the local and remote ...
Page 9
Table 2. Temperature Data Format (Temperature High Byte) Temperature Binary Offset Binary (Note 1) –55°C 0 000 0000 (Note 2) 0°C 0 000 0000 +1°C 0 000 0001 +10°C 0 000 1010 +25°C 0 001 1001 +50°C 0 011 0010 ...
Page 10
Conversion Rate Register The conversion rate register is Address 0x04 at read and Address 0x0A at write. The lowest four bits of this register are used to program the conversion rate by dividing the internal oscillator clock ...
Page 11
Table 5. Status Register Bit Assignments Bit Name Function 7 BUSY 1 when ADC is converting 6 LHIGH 1 when local high temperature limit is (Note 1) tripped 5 LLOW 1 when local low temperature limit is (Note 1) tripped ...
Page 12
Table 8. List of Registers Read Address (Hex) Write Address (Hex) Not Applicable Not Applicable 00 Not Applicable 01 Not Applicable 02 Not Applicable Not Applicable 0F (Note ...
Page 13
The number of data bytes that can be transmitted over the serial bus in a single read or write operation is limited only by what the master and slave devices can handle. 3. When all data bytes have been ...
Page 14
When reading data from a register there are two possibilities. • If the address pointer register value of the NCT1008 is unknown or not the desired value first necessary to set it to the correct value before data ...
Page 15
D+ and D−. The output of this comparator is checked when a conversion is initiated. Bit 2 of the status register (open flag) is set if a fault is detected. If the ALERT pin ...
Page 16
TEMPERATURE 905C 805C 705C 605C 505C 405C 305C 1 THERM2 3 2 THERM Figure 20. Operation of the THERM and THERM2 Interrupts • When the THERM2 limit is exceeded, the THERM2 signal asserts low. • If the temperature continues to ...
Page 17
In the case of the remote sensor, this should not be a problem since it is either a substrate transistor in the processor or a small package ...
Page 18
... Package Description NCT1008CMT3R2G 8−Lead WDFN, 2x2 NCT1008DMT3R2G 8−Lead WDFN, 2x2 NCT1008CMN3R2G 8−Lead DFN, 3x3 NCT1008DMN3R2G 8−Lead DFN, 3x3 †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *The “G’’ suffix indicates Pb−Free package available. ...
Page 19
... SEATING PLANE 7X 0.78 0. NOTE 3 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com 19 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN ...
Page 20
... C NOTE 3 0.63 8X *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81− ...