NCT1008 Datasheet PDF - ON Semiconductor
| Part Number | NCT1008 | |
| Description | +-1 C Temperature Monitor | |
| Manufacturers | ON Semiconductor | |
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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 kW (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
www.DataSheet4U.com
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WDFN8
CASE 511AT
1
DFN8
CASE 506BJ
1
MARKING DIAGRAMS
1
8xMG
G
1 NCT 8
1008x
ALYWG
G
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)
PIN ASSIGNMENT
VCC 1
8 SCLK
D+ 2
7 SDATA
D− 3
6 ALERT/THERM2
THERM 4
5 GND
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
August, 2010 − Rev. 3
1
Publication Order Number:
NCT1008/D
|
| |
 
NCT1008
TYPICAL CHARACTERISTICS
3.5
DEV 1 DEV 8
DEV 15
3.0
DEV 2 DEV 9
DEV 16
DEV 3 DEV 10 MEAN
2.5 DEV 4 DEV 11 HIGH 4R
DEV 5 DEV 12 LOW 4R
2.0
DEV 6
DEV 7
DEV 13
DEV 14
1.5
1.0
0.5
0
–0.5
–1.0
–50
0 50 100
TEMPERATURE (5C)
150
Figure 3. Local Temperature Error vs. Temperature
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–50
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
HIGH 4R
LOW 4R
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0 50 100
TEMPERATURE (5C)
150
Figure 4. Remote Temperature Error vs. Actual
Temperature
10
5
D+ TO GND
0
–5
D+ TO VCC
–10
–15
–20
–25
1
10
LEAKAGE RESISTANCE (MΩ)
100
Figure 5. Temperature Error vs. D+/D− Leakage
Resistance
0
–2
–4
–6
–8
–10
DEV 3
–12 DEV 2
–14
DEV 4
–16
–18
0
5 10 15 20
CAPACITANCE (nF)
25
Figure 6. Temperature Error vs. D+/D− Capacitance
1000
900
DEV 2BC
800
700
600
500
DEV 4BC
400
300 DEV 3BC
200
100
0
0.01
0.1 1 10
CONVERSION RATE (Hz)
Figure 7. Operating Supply Current vs.
Conversion Rate
100
422
420
DEV 2BC
418
416
414 DEV 3BC
DEV 4BC
412
410
408
3.0 3.1 3.2 3.3 3.4 3.5 3.6
VDD (V)
Figure 8. Operating Supply Current vs. Voltage
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| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ NCT1008.PDF Datasheet ] | |
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