NCT210
Low Cost Microprocessor
System Temperature
Monitor Microcomputer
The NCT210 is a two-channel digital thermometer and
under/overtemperature alarm, intended for use in personal computers
and other systems requiring thermal monitoring and management. The
device can measure the temperature of a microprocessor using a
diode-connected PNP transistor, which can be provided on-chip with
the processor, or can be a low cost discrete NPN/PNP device, such as
the 2N3904/2N3906. A novel measurement technique cancels out the
absolute value of the transistor’s base emitter voltage so that no
calibration is required. The second measurement channel measures the
output of an on-chip temperature sensor to monitor the temperature of
the device and its environment.
The NCT210 communicates over a two-wire serial interface
compatible with SMBus standards. Under/overtemperature limits can
be programmed into the device over the serial bus, and an ALERT
output signals when the on-chip or remote temperature is out of range.
This output can be used as an interrupt or as an SMBus alert.
Features
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QSOP−16
CASE 492
PIN ASSIGNMENT
NC
V
DD
D+
D−
NC
ADD1
GND
GND
1
2
3
4
5
6
7
8
16
15
14
NC
STBY
SCLK
NC
SDATA
ALERT
ADD0
NC
NCT210
(Top View)
13
12
11
10
9
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Alternative to the ADM1021A
On-chip and Remote Temperature Sensing
No Calibration Necessary
1°C Accuracy for On-chip Sensor
3°C Accuracy for Remote Sensor
Programmable Over/Undertemperature Limits
Programmable Conversion rate
2-wire SMBus Serial Interface
Supports System Management Bus (SMBus) Alert
200
mA
Max Operating Current
1
mA
Standby Current
3.0 V to 5.5 V Supply
Small 16-lead QSOP Package
This Device is Pb-Free, Halogen Free and is RoHS Compliant
NC = No Connect
MARKING DIAGRAM
NCT210
#YYWW
Applications
NCT210
#
YYWW
= Specific Device Code
= Pb-Free Package
= Date Code
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecom Equipment
Instrumentation
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
©
Semiconductor Components Industries, LLC, 2012
September, 2012
−
Rev. 2
1
Publication Order Number:
NCT210/D
NCT210
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
ON-CHIP
TEMPERATURE
SENSOR
CONVERTION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
LOCAL TEMPERATURE
LOW LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH LIMIT COMPARATOR
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
CONFIGURATION
REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
INTERRUPT
MASKING
15 STBY
D+
D−
3
4
ANALOG
MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
STATUS REGISTER
11 ALERT
NCT210
SMBus INTERFACE
1
NC
2
V
DD
5
NC
7
GND
8
GND
9
NC
13
NC
16
NC
12
SDATA
14
SCLK
10
ADD0
6
ADD1
NC = NO CONNECT
Figure 1. Functional Block Diagram
Table 1. PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
NC
V
DD
D+
D−
NC
ADD1
GND
GND
NC
ADD0
ALERT
SDATA
NC
SCLK
STBY
NC
No Connect
Positive Supply, 3.0 V to 5.5 V
Positive Connection to Remote Temperature Sensor
Negative Connection to Remote Temperature Sensor
No Connect
Three-state Logic Input, Higher Bit of Device Address
Supply 0 V Connection
Supply 0 V Connection
No Connect
Three-state Logic Input, Lower Bit of Device Address
Open-drain Logic Output Used as Interrupt or SMBus ALERT
Logic Input/Output, SMBus Serial Data. Open-drain Output
No Connect
Logic Input, SMBus Serial Clock
Logic Input Selecting Normal Operation (High) or Standby Mode (Low)
No Connect
Description
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NCT210
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Positive Supply Voltage (V
DD
) to GND
D+, ADD0, ADD1
D− to GND
SCLK, SDATA, ALERT, STBY
Input Current
Input Current, D−
ESD Rating, All Pins (Human Body Model)
Continuous Power Dissipation
Up to 70°C
Derating Above 70°C
Operating Temperature Range
Maximum Junction Temperature (T
J MAX
)
Storage Temperature Range
Lead Temperature, Soldering (10 sec)
IR Reflow Peak Temperature
Rating
−0.3
to +6.0
−0.3
to V
DD
+0.3
−0.3
to +0.6
−0.3
to +6.0
±50
±1
2,000
650
6.7
−55
to +125
150
−65
to +150
300
220
V
mA
mA
V
mW
mW/°C
°C
°C
°C
°C
°C
Unit
V
V
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
Package Type
16-lead QSOP Package
q
JA
105
Unit
°C/W
Table 4. ELECTRICAL CHARACTERISTICS
(T
A
= T
MIN
to T
MAX
, V
DD
= 3.0 V to 3.6 V, unless otherwise noted) (Note 1)
Parameter
Power Supply and ADC
Temperature Resolution
Temperature Error, Local Sensor
Temperature Error, Remote Sensor
Supply Voltage Range (Note 2)
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Power-on Reset Threshold
POR Threshold Hysteresis
Standby Supply Current
Average Operating Supply Current
Auto-convert Mode, Averaged Over 4 Sec
Conversion Time
Remote Sensor Source Current
D− Source Voltage
Address Pin Bias Current (ADD0, ADD1)
Momentary at Power-on Reset
V
DD
= 3.3 V, No SMBus Activity
SCLK at 10 kHz
0.25 Conversions/Sec Rate
2 Conversions/Sec Rate
From Stop Bit to Conversion Complete
(Both Channels) D+ Forced to D− + 0.65 V
High Level (Note 3)
Low Level (Note 3)
V
DD
, Falling Edge (Note 3)
V
DD
Input, Disables ADC, Rising Edge
T
A
= 60°C to 100°C
Guaranteed No Missed Codes
1.0
−3.0
−3.0
−5.0
3.0
2.5
−
0.885
−
−
−
−
−
65
120
7.0
−
−
−
±1.0
−
−
−
2.7
25
1.7
50
1.0
4.0
130
225
115
205
12
0.7
50
−
+3.0
+3.0
+5.0
3.6
2.95
−
2.2
−
5.0
−
200
370
170
300
16
−
−
°C
°C
°C
V
V
mV
V
mV
mA
mA
mA
ms
mA
V
mA
Test Conditions/Comments
Min
Typ
Max
Unit
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NCT210
Table 4. ELECTRICAL CHARACTERISTICS
(continued)
(T
A
= T
MIN
to T
MAX
, V
DD
= 3.0 V to 3.6 V, unless otherwise noted) (Note 1)
Parameter
SMBus Interface
(See Figure 2)
Logic Input High Voltage, V
IH
STBY, SCLK, SDATA
Logic Input Low Voltage, V
IL
STBY, SCLK, SDATA
SMBus Output Low Sink Current
ALERT Output Low Sink Current
Logic Input Current, I
IH
, I
IL
SMBus Input Capacitance, SCLK, SDATA
SMBus Clock Frequency
SMBus Clock Low Time, t
LOW
SMBus Clock High Time, t
HIGH
SMBus Start Condition Setup Time,
t
SU:STA
SMBus Repeat Start Condition
Setup Time, t
SU:STA
SMBus Start Condition Hold Time, t
HD:STA
SMBus Stop Condition Setup Time, t
SU:STO
SMBus Data Valid to SCLK
Rising Edge Time, t
SU:DAT
SMBus Data Hold Time, t
BUF:DAT
SMBus Bus Free Time, t
BUF
SCLK Falling Edge to SDATA
Valid Time, t
VD:DAT
Master Clocking in Data
1. T
MAX
= 100°C, T
MIN
= 0°C
2. Operation at V
DD
= 5.0 V guaranteed by design; not production tested.
3. Guaranteed by design; not production tested.
Between Start/Stop Condition
Between 90% and 90% Points
Time from 10% of SDATA to 90% of SCLK
Time from 90% of SCLK to 10% of SDATA
Time for 10% or 90% of SDATA to 10% of SCLK
Time for 10% or 90% of SDATA to 10% of SCLK
t
LOW
between 10% Points
t
HIGH
between 90% Points
V
DD
= 3.0 V to 5.5 V
V
DD
= 3.0 V to 5.5 V
SDATA Forced to 0.6 V
ALERT
F
orced to 0.4 V
2.2
−
6.0
1.0
−1.0
−
−
4.7
4.0
4.7
250
250
4.0
4.0
250
250
0
4.7
−
−
−
−
−
−
−
5.0
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
0.8
−
−
+1.0
−
100
−
−
−
−
−
−
−
−
−
−
−
1
1
V
V
mA
mA
mA
pF
kHz
ms
ms
ms
ns
ns
ms
ms
ns
ns
ms
ms
ms
ms
Test Conditions/Comments
Min
Typ
Max
Unit
t
LOW
SCLK
t
F
t
R
t
HD; STA
t
HD; STA
t
HD; DAT
t
HIGH
t
SU; DAT
t
SU; STA
t
SU; STO
SDATA
t
BUF
STOP START
START
STOP
Figure 2. Serial Bus Timing
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NCT210
TYPICAL PERFORMANCE CHARACTERISTICS
20
TEMPERATURE ERROR (°C)
10
5
0
−5
−10
−15
−20
−25
−30
1
10
LEAKAGE RESISTANCE (MW)
100
D+ To V
DD
D+ To GND
TEMPERATURE ERROR (°C)
15
5
4
250 mV p-p REMOTE
3
2
100 mV p-p REMOTE
1
0
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 3. Temperature Error vs. PC Board Track
Resistance
9
TEMPERATURE ERROR (°C)
8
7
6
5
4
3
2
1
0
1
10
100
1k
10k 100k
50 mV p-p
Figure 4. Temperature Error vs. Power Supply
Noise Frequency
14
TEMPERATURE ERROR (°C)
12
10
8
6
4
2
0
−2
2
4
6
8
10 12 14 16 18 20 22 24
CAPACITANCE (nF)
100 mV p-p
25 mV p-p
1M
10M 100M
FREQUENCY (Hz)
Figure 5. Temperature Error vs. Common-mode
Noise Frequency
70
TEMPERATURE ERROR (°C)
60
SUPPLY CURRENT (mA)
50
40
30
20
10
0
V
DD
= 5 V
1
5
10
25
50
75 100 250 500 750 1000
V
DD
= 3.3 V
Figure 6. Temperature Error vs. Capacitance
between D+ and D−
4
3
10 mV p-p
2
1
0
100k
1M
10M
FREQUENCY (Hz)
100M
1G
SCLK FREQUENCY (kHz)
Figure 7. Standby Supply Current vs. Clock
Frequency
Figure 8. Temperature Error vs. Differential-mode
Noise Frequency
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