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NCT1008 PDF даташит

Спецификация NCT1008 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «+-1 C Temperature Monitor».

Детали детали

Номер произв NCT1008
Описание +-1 C Temperature Monitor
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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NCT1008 Даташит, Описание, Даташиты
NCT1008
+15C Temperature Monitor
with Series Resistance
Cancellation
The NCT1008 is a dualchannel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is registercompatible 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 2wire 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 onchip 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
OnChip 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
RegisterCompatible with ADM1032 and ADT7461
Remote THERM Limit of 108°C
2Wire SMBus/I2C Serial Interface with SMBus Alert Support
Programmable Over/Undertemperature Limits
Offset Registers for System Calibration
Up to Two Overtemperature FailSafe THERM Outputs
Small 8Lead DFN
240 mA Operating Current, 5 mA Standby Current
Compatible with 1.8 V Logic
PbFree 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 = PbFree Package
x = C or D
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
VCC 1
8 SCLK
D+ 2
7 SDATA
D3
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 Даташит, Описание, Даташиты
NCT1008
ONCHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
D+ 2
D– 3
ANALOG
MUX
ATOD
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPENCIRCUIT
NCT1008
STATUS REGISTER
ADDRESS POINTER
REGISTER
LOCAL TEMPERATURE
LOWLIMIT REGISTER
LOCAL TEMPERATURE
HIGHLIMIT REGISTER
REMOTE TEMPERATURE
LOWLIMIT REGISTER
REMOTE TEMPERATURE
HIGHLIMIT 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+
Dto 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
8Lead DFN
qJA qJC
142 43.74
Unit
°C/W
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NCT1008 Даташит, Описание, Даташиты
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.
OpenDrain 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.
OpenDrain 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. OpenDrain 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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NCT1008+-1 C Temperature MonitorON Semiconductor
ON Semiconductor

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