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Спецификация NCT1008 изготовлена «ON Semiconductor» и имеет функцию, называемую «+-1 C Temperature Monitor». |
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Детали детали
Номер произв | NCT1008 |
Описание | +-1 C Temperature Monitor |
Производители | ON Semiconductor |
логотип |
20 Pages
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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
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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
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NCT1008
ON−CHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
D+ 2
D– 3
ANALOG
MUX
A−TO−D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPEN−CIRCUIT
NCT1008
STATUS REGISTER
ADDRESS POINTER
REGISTER
LOCAL TEMPERATURE
LOW−LIMIT REGISTER
LOCAL TEMPERATURE
HIGH−LIMIT REGISTER
REMOTE TEMPERATURE
LOW−LIMIT REGISTER
REMOTE TEMPERATURE
HIGH−LIMIT REGISTER
LOCAL THERM LIMIT
REGISTERS
EXTERNAL THERM LIMIT
REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
SMBus/I2C INTERFACE
1
VDD
5
GND
7
SDATA
8
SCLK
Figure 1. Functional Block Diagram
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6 ALERT/THERM2
4 THERM
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
Positive Supply Voltage (VDD) to GND
D+
D− to GND
−0.3, +3.6
−0.3 to VDD + 0.3
−0.3 to +0.6
V
V
V
SCLK, SDATA, ALERT, THERM
−0.3 to +3.6
V
Input Current, SDATA, THERM
−1, +50
mA
Input Current, D−
±1 mA
ESD Rating, All Pins (Human Body Model)
1500
V
Maximum Junction Temperature (TJ Max)
150 °C
Storage Temperature Range
−65 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
THERMAL CHARACTERISTICS
Package Type
8−Lead DFN
qJA qJC
142 43.74
Unit
°C/W
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NCT1008
PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
VDD
D+
D−
THERM
GND
ALERT/THERM2
SDATA
SCLK
Positive Supply, 2.8 V to 3.6 V.
Description
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Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Open−Drain Output. Can be used to turn a fan on/off or throttle a CPU clock in the event of an
overtemperature condition. Requires pullup resistor.
Supply Ground Connection.
Open−Drain Logic Output Used as Interrupt or SMBus ALERT. This can also be configured as a
second THERM output. Requires pullup resistor to VDD.
Logic Input/Output, SMBus Serial Data. Open−Drain Output. Requires pullup resistor.
Logic Input, SMBus Serial Clock. Requires pullup resistor.
NOTE: The ground slug on 3x3 package can be left unconnected.
SMBus/I2C TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at TMIN and TMAX
fSCLK
400
tLOW
1.3
tHIGH
0.6
tR 300
tF 300
tSU; STA
600
tHD; STA (Note 2)
600
tSU; DAT (Note 3)
100
tSU; STO (Note 4)
600
tBUF
1.3
1. Guaranteed by design, but not production tested.
2. Time from 10% of SDATA to 90% of SCLK.
3. Time for 10% or 90% of SDATA to 10% of SCLK.
4. Time for 90% of SCLK to 10% of SDATA.
Unit
kHz max
ms min
ms min
ns max
ns max
ns min
ns min
ns min
ns min
ms min
Description
−
Clock low period, between 10% points.
Clock high period, between 90% points.
Clock/data rise time.
Clock/data fall time.
Start condition setup time.
Start condition hold time.
Data setup time.
Stop condition setup time.
Bus free time between stop and start conditions.
SCLK
SDATA
tBUF
STOP START
tLOW
tR
tHD;STA
tHD;DAT
tF
tHIGH
tSU;DAT
tHD;STA
tSU;STA
START
Figure 2. Serial Bus Timing
tSU;STO
STOP
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