NVT211
+15C
Temperature Monitor
with Series Resistance
Cancellation
The NVT211 is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in thermal
management systems. It is register-compatible with the NCT1008 and
NCT72. A feature of the NVT211 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 NVT211 has a configurable ALERT
output and an extended, switchable temperature measurement range.
The NVT211 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 NCT1008 and NCT72, but it can be switched to a wider
measurement range of
−64°C
to +191°C.
The NVT211 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 NVT211 is 0x4C. An NVT211D is
available with an SMBus/I
2
C address of 0x4D. This is useful if more
than one NVT211 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.
The NVT211 has been through Automotive Qualification according to
AEC−Q100 Grade 1 standards.
Features
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WDFN8
MT SUFFIX
CASE 511AT
PIN ASSIGNMENT
1
V
DD
D+
D−
THERM
(Top View)
SCLK
SDATA
ALERT/
THERM2
GND
MARKING DIAGRAM
1
NxMG
G
WDFN8
Nx
M
G
= Device Code (Where x = C or D)
= Date Code
= Pb-Free Package
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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 NCT1008 and NCT72
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
2
×
2 WDFN8 Package
240
mA
Operating Current, 5
mA
Standby Current
Automotive Qualification According to AEC−Q100, Grade 1
These are Pb−Free Devices
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
Applications
•
Automotive
•
Embedded Systems
1
Publication Order Number:
NVT211/D
©
Semiconductor Components Industries, LLC, 2013
December, 2013
−
Rev. 0
NVT211
ON-CHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
DIGITAL MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
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
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTER
INTERRUPT
MASKING
D+
D−
2
3
ANALOG
MUX
REMOTE OFFSET
REGISTER
NVT211
SMBus/I
2
C INTERFACE
1
V
DD
5
GND
7
SDATA
8
SCLK
4
THERM
6
ALERT/THERM2
Figure 1. Functional Block Diagram
Table 1. PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
Mnemonic
V
DD
D+
D−
THERM
GND
ALERT/THERM2
SDATA
SCLK
Positive Supply, 2.8 V to 3.6 V.
Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Open-drain Output. Can be used as an overtemperature shutdown pin. 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 V
DD
.
Logic Input/Output, SMBus/I
2
C Serial Data. Open-drain Output. Requires pullup resistor.
Logic Input, SMBus/I
2
C Serial Clock. Requires pullup resistor.
Description
8
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.
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2
NVT211
Table 3. 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
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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3
NVT211
Table 4. ELECTRICAL CHARACTERISTICS
(T
A
=
−40°C
to +125°C, V
DD
= 2.8 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
3.0 V to 3.6 V
Local Sensor Accuracy
2.8 V to 3.6 V
Resolution
Remote Diode Sensor Accuracy
3.0 V to 3.6 V
Remote Diode Sensor Accuracy
2.8 V to 3.6 V
Resolution
Remote Sensor Source Current
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
Output Low Voltage, V
OL
High Level Output Leakage Current, I
OH
SMBus/I
2
C Interface
(Note 4 and 5)
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/I
2
C Input Capacitance,
SCLK, SDATA
SMBus/I
2
C Clock Frequency
SMBus/I
2
C Timeout (Note 6)
SCLK Falling Edge to SDATA Valid Time
1.
2.
3.
4.
5.
6.
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
Resistance Split Evenly on both the D+ and D– Inputs
I
OUT
=
−6.0
mA
V
OUT
= V
DD
Open-drain Digital Outputs (THERM, ALERT/THERM2)
−
−
−
0.1
0.4
1.0
V
mA
0°C
≤
T
A
≤
+70°C,
−55°C
≤
T
D
(Note 3)
≤
+150°C
0°C
≤
T
A
≤
+85°C,
−55°C
≤
T
D
(Note 3)
≤
+150°C
−40°C
≤
T
A
≤
+100°C,
−55°C
≤
T
D
(Note 3)
≤
+150°C
0°C
≤
T
A
≤
+70°C,
−20°C
≤
T
D
≤
+110°C
−20°C
≤
T
A
≤
+110°C, T
D
= +40°C
0°C
≤
T
A
≤
+70°C
0°C
≤
T
A
≤
+85°C
−20°C
≤
T
A
≤
+110°C
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
1.0
−
−
−
−
−
0.25
220
82
13.5
40
6.0
±1.0
±1.5
±2.5
−
±1.0
±1.5
±2.5
±1.5
±2.25
−
−
−
−
52
8.0
°C
°C
°C
°C
0.0625 Conversions/Sec Rate (Note 1, 2)
Standby Mode
V
DD
input, disables ADC, rising edge
2.8
−
−
−
1.0
3.30
240
5.0
2.55
−
3.6
350
30
−
2.56
V
mA
V
V
Conditions
Min
Typ
Max
Unit
°C
°C
mA
Conversion Time
ms
ms
−
1.5
−
kW
See Table 8 for information on other conversion rates.
THERM and ALERT pulled to V
DD
.
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
NVT211
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
−1.0
−50
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
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
−15
−20
−25
−2
−4
−6
−8
−10
−12
−14
−16
−18
0
5
10
D+ To V
DD
DEV 3
DEV 2
DEV 4
1
10
100
15
20
25
LEAKAGE RESISTANCE (MW)
CAPACITANCE (nF)
Figure 5. Temperature Error vs. D+/D− Leakage
Resistance
1000
900
800
700
Figure 6. Temperature Error vs. D+/D− Capacitance
DEV 2BC
422
420
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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