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NCT72CMNR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
Semiconductor Components Industries, LLC, 2012
August, 2012 − Rev. 4
1 Publication Order Number:
NCT72/D
NCT72
+15C Temperature Monitor
with Series Resistance
Cancellation
The NCT72 is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is pin and register compatible with the
NCT1008 but the NCT72 allows the user to pull the ALERT
pin to
1.8 V without increasing the device Idd. A feature of the NCT72 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
NCT72 has a configurable ALERT
output and an extended, switchable
temperature measurement range.
The NCT72 can measure the temperature of a remote thermal diode
accurate to 1C and the ambient temperature accurate to 3C. The
temperature measurement range defaults to 0C to +127C, compatible
with the NCT1008, but it can be switched to a wider measurement range
of −64C to +191C.
The NCT72 communicates over a 2-wire serial interface, compatible
with system management bus (SMBus/I
2
C) standards. The default
SMBus/I
2
C address of the NCT72 is 0x4C. An NCT72D is available
with an SMBus/I
2
C address of 0x4D. This is useful if more than one
NCT72 is used on the same SMBus/I
2
C.
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
0.25C Resolution/1C Accuracy on Remote Channel
1C Resolution/1C Accuracy on Local Channel
Series Resistance Cancellation Up to 1.5 kW
Extended, Switchable Temperature Measurement Range
0C to +127C (Default) or –64C to +191C
Pin and Register Compatible with NCT1008
Remote THERM Limit of 108C
2-wire SMBus/I
2
C 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
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Smart Phones
Desktop and Notebook Computers
Smart Batteries
Automotive
Embedded Systems
MARKING DIAGRAMS
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PIN ASSIGNMENT
(Top View)
DFN8
CASE 506BJ
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
NCT
72x
ALYWG
G
1
8
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)
WDFN8
CASE 511AT
7xMG
G
1
SCLKV
DD
D+
D−
THERM
SDATA
ALERT
/
THERM2
GND
1
2
3
4
8
7
6
5
7x = Device Code (Where x = C or D)
M = Date Code
G = Pb-Free Package
WDFN8
DFN8
(Note: Microdot may be in either location)
NCT72
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2
Figure 1. Functional Block Diagram
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
BUSY
A-TO-D
CONVERTER
LOCAL TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTER
SMBus/I
2
C INTERFACE
LIMIT COMPARATOR
DIGITAL MUX
INTERRUPT
MASKING
SDATA SCLK
87
ADDRESS POINTER
REGISTER
CONVERSION RATE
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
4
6
GND
5
V
DD
1
NCT72
D+
ALERT
/THERM2THERM
2
D−
3
REMOTE TEMPERATURE
VALUE REGISTER
DIGITAL MUX
Table 1. PIN ASSIGNMENT
Pin No. Mnemonic Description
1 V
DD
Positive Supply, 2.8 V to 3.6 V.
2 D+ Positive Connection to Remote Temperature Sensor.
3 D− Negative Connection to Remote Temperature Sensor.
4 THERM 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.
5 GND Supply Ground Connection.
6 ALERT/THERM2 Open-drain Logic Output Used as Interrupt or SMBus ALERT. This can also be configured as a
second THERM
output. Requires pullup resistor.
7 SDATA Logic Input/Output, SMBus Serial Data. Open-drain Output. Requires pullup resistor.
8
SCLK Logic Input, SMBus Serial Clock. Requires pullup resistor.
NOTE: The ground slug on 3x3 package can be left unconnected.
NCT72
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3
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
DD
) to GND −0.3, +3.6 V
D+ −0.3 to V
DD
+ 0.3 V
D− to GND −0.3 to +0.6 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) 1,500 V
Maximum Junction Temperature (T
J
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.
Table 3. THERMAL CHARACTERISTICS (Note 1)
Package Type
q
JA
q
JC
Unit
8-lead DFN 142 43.74 C/W
1. q
JA
is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
Table 4. SMBus/I
2
C TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at T
MIN
and T
MAX
Unit Description
f
SCLK
400 kHz max −
t
LOW
1.3
ms min
Clock Low Period, between 10% Points
t
HIGH
0.6
ms min
Clock High Period, between 90% Points
t
R
300 ns max Clock/Data Rise Time
t
F
300 ns max Clock/Data Fall Time
t
SU;
STA
600 ns min Start Condition Setup Time
t
HD;
STA
(Note 2) 600 ns min Start Condition Hold Time
t
SU;
DAT
(Note 3) 100 ns min Data Setup Time
t
SU;
STO
(Note 4) 600 ns min Stop Condition Setup Time
t
BUF
1.3
ms min
Bus Free Time between Stop and Start Conditions
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.
Figure 2. Serial Bus Timing
STOPSTART
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
STOP START
SCLK
SDATA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

NCT72CMNR2G

Mfr. #:
Buy NCT72CMNR2G
Manufacturer:
ON Semiconductor
Description:
Board Mount Temperature Sensors REMOTE THERMAL SENSOR
Lifecycle:
New from this manufacturer.
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