NCT214
+15C
Temperature Monitor
with Series Resistance
Cancellation
The NCT214 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 NCT214 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 NCT214 has a
configurable ALERT output and an extended, switchable temperature
measurement range.
The NCT214 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 NCT214 communicates over a 2-wire serial interface,
compatible with system management bus (SMBus/I
2
C) standards. The
NCT214 has two address pins which allow up to 9 NCT214s to be used
on the same bus.
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
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WDFN10
CASE 522AA
PIN ASSIGNMENT
ADD1
V
DD
D+
D−
THERM
1
ADD0
SCLK
SDATA
ALERT/THERM2
GND
(Top View)
MARKING DIAGRAM
NCT
214
ALYWG
G
NCT214 = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb-Free Package
(Note: Microdot may be in either location)
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•
•
•
•
•
•
•
•
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•
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
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
240
mA
Operating Current, 5
mA
Standby Current
This Device is Pb-Free, Halogen Free and is RoHS Compliant
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
©
Semiconductor Components Industries, LLC, 2014
1
April, 2014 − Rev. 4
Publication Order Number:
NCT214/D
NCT214
ON-CHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
DIGITAL MUX
LIMIT COMPARATOR
ADDRESS POINTER
REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
DIGITAL MUX
REMOTE TEMPERATURE
LOW-LIMIT REGISTER
REMOTE TEMPERATURE
HIGH-LIMIT REGISTER
LOCAL THERM
LIMIT REGISTERS
EXTERNAL THERM
LIMIT REGISTERS
CONFIGURATION
REGISTERS
D+
D−
3
4
ANALOG
MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTER
INTERRUPT
MASKING
NCT214
SMBus/I
2
C INTERFACE
2
V
DD
6
GND
1
ADD1
10
ADD0
8
SDATA
9
SCLK
5
THERM
7
ALERT/THERM2
Figure 1. Functional Block Diagram
Table 1. PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
ADD1
V
DD
D+
D−
THERM
GND
ALERT/THERM2
SDATA
SCLK
ADD0
Description
Address 1 pin. Tri-state input to set the SMBus address.
Positive Supply, 3.0 V to 3.6 V.
Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Active-low open-drain overtemperature output pin; needs pullup resistor.
Ground
Open-drain Logic Output used as interrupt or SMBus ALERT. This can also be configured as a
second THERM output. Requires pullup resistor.
Logic Input/Output, SMBus Serial Data. Open-drain Output. Requires pullup resistor.
Logic Input, SMBus Serial Clock. Requires pullup resistor.
Address 0 pin. Tri-state input to set the SMBus address.
9
10
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2
NCT214
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Positive Supply Voltage (V
DD
) to GND
D+
D− to GND
SCLK, SDATA, ALERT, THERM
Input Current, SDATA, THERM
Input Current, D−
ESD Rating, All Pins (Human Body Model)
Maximum Junction Temperature (T
J MAX
)
Storage Temperature Range
Rating
−0.3, +3.6
−0.3 to V
DD
+ 0.3
−0.3 to +0.6
−0.3 to +3.6
−1, +50
±1
1,500
150
−65 to +150
Unit
V
V
V
V
mA
mA
V
°C
°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
10-lead WDFN
q
JA
142
q
JC
43.74
Unit
°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
f
SCLK
t
LOW
t
HIGH
t
R
t
F
t
SU; STA
t
HD; STA
(Note 2)
t
SU; DAT
(Note 3)
t
SU; STO
(Note 4)
t
BUF
1.
2.
3.
4.
Limit at T
MIN
and T
MAX
400
1.3
0.6
300
300
600
600
100
600
1.3
Unit
kHz max
ms
min
ms
min
ns max
ns max
ns min
ns min
ns min
ns min
ms
min
−
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
Description
Guaranteed by design, but not production tested.
Time from 10% of SDATA to 90% of SCLK.
Time for 10% or 90% of SDATA to 10% of SCLK.
Time for 90% of SCLK to 10% of SDATA.
t
LOW
t
R
SCLK
t
F
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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3
NCT214
Table 5. ELECTRICAL CHARACTERISTICS
(T
A
= −40°C to +125°C, V
DD
= 3.0 V to 3.6 V, unless otherwise noted)
Parameter
Power Supply
Supply Voltage, V
DD
Average Operating Supply Current, I
DD
Undervoltage Lockout Threshold
Power-on Reset Threshold
Temperature-to-Digital Converter
Local Sensor Accuracy
0°C
≤
T
A
≤
+70°C
0°C
≤
T
A
≤
+85°C
−40°C
≤
T
A
≤
+100°C
0°C
≤
T
A
≤
+70°C, −55°C
≤
T
D
(Note 2)
≤
+150°C
0°C
≤
T
A
≤
+85°C, −55°C
≤
T
D
(Note 2)
≤
+150°C
−40°C
≤
T
A
≤
+100°C, −55°C
≤
T
D
(Note 2)
≤
+150°C
−
−
−
−
−
−
−
−
High Level (Note 3)
Middle Level (Note 3)
Low Level (Note 3)
From Stop Bit to Conversion Complete, One-shot Mode
with Averaging Switched On
One-shot Mode with Averaging Off
(that is, Conversion Rate = 16-, 32-, or 64-conversions per
Second)
Maximum Series Resistance Cancelled
Resistance Split Evenly on both the D+ and D– Inputs
−
−
−
−
−
−
−
−
1.0
−
−
−
0.25
220
82
13.5
40
6.0
±1.0
±1.5
±2.5
−
±1.0
±1.5
±2.5
−
−
−
−
52
8.0
°C
0.0625 Conversions/Sec Rate (Note 1)
Standby Mode
V
DD
Input, Disables ADC, Rising Edge
3.0
−
−
−
1.0
3.30
240
5.0
2.55
−
3.6
350
30
−
2.5
V
mA
V
V
Conditions
Min
Typ
Max
Unit
Resolution
Remote Diode Sensor Accuracy
°C
°C
Resolution
Remote Sensor Source Current
°C
mA
Conversion Time
ms
ms
−
1.5
−
kW
Open-drain Digital Outputs (THERM, ALERT/THERM2)
Output Low Voltage, V
OL
High Level Output Leakage Current, I
OH
SMBus/I
2
C Interface
(Note 3 and 4)
Logic Input High Voltage, V
IH
SCLK,
SDATA
Logic Input Low Voltage, V
IL
SCLK,
SDATA
Hysteresis
SDA Output Low Voltage, V
OL
Logic Input Current, I
IH
, I
IL
SMBus Input Capacitance, SCLK,
SDATA
SMBus Clock Frequency
SMBus Timeout (Note 5)
SCLK Falling Edge to SDATA Valid Time
1.
2.
3.
4.
5.
User Programmable
Master Clocking in Data
1.4
−
−
−
−1.0
−
−
−
−
−
−
500
−
−
5.0
−
25
−
−
0.8
−
0.4
+1.0
−
400
64
1.0
V
V
mV
mA
mA
pF
kHz
ms
ms
I
OUT
= −6.0 mA
V
OUT
= V
DD
−
−
−
0.1
0.4
1.0
V
mA
See Table 9 for information on other conversion rates.
Guaranteed by characterization, but not production tested.
Guaranteed by design, but not production tested.
See SMBus/I
2
C Timing Specifications section for more information.
Disabled by default. Detailed procedures to enable it are in the Serial Bus Interface section of the datasheet.
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4
NCT214
TYPICAL PERFORMANCE CHARACTERISTICS
3.5
3.5
TEMPERATURE ERROR (°C)
2.5
2.0
1.5
1.0
0.5
0
−0.5
−1.0
−50
TEMPERATURE ERROR (°C)
3.0
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
MEAN
HIGH 4
R
LOW 4
R
3.0
2.5
2.0
1.5
1.0
0.5
0
−0.5
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 4
R
LOW 4
R
0
50
100
150
−1.0
−50
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. Local Temperature Error vs. Temperature
Figure 4. Remote Temperature Error vs. Actual
Temperature
0
10
TEMPERATURE ERROR (°C)
D+ To GND
TEMPERATURE ERROR (°C)
5
0
−5
−10
−2
−4
−6
−8
−10
−12
−14
D+ To V
DD
−15
−20
−25
1
10
100
DEV 3
DEV 2
DEV 4
−16
−18
0
5
10
15
20
25
LEAKAGE RESISTANCE (MW)
CAPACITANCE (nF)
Figure 5. Temperature Error vs. D+/D− Leakage
Resistance
Figure 6. Temperature Error vs. D+/D− Capacitance
1000
900
DEV 2BC
422
420
800
700
418
DEV 2BC
I
DD
(mA)
I
DD
(mA)
600
500
400
300
200
100
0
0.01
0.1
1
10
100
416
414
412
410
408
3.0
DEV 4BC
DEV 3BC
DEV 3BC
DEV 4BC
3.1
3.2
3.3
3.4
3.5
3.6
CONVERSION RATE (Hz)
V
DD
(V)
Figure 7. Operating Supply Current vs.
Conversion Rate
Figure 8. Operating Supply Current vs. Voltage
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