Burr Brown Products
from Texas Instruments
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
±1°C Remote and Local TEMPERATURE SENSOR
in SOT23-8
1
FEATURES
SOT23-8 PACKAGE
±1°C REMOTE DIODE SENSOR (MAX)
±1.5°C LOCAL TEMPERATURE SENSOR (MAX)
SERIES RESISTANCE CANCELLATION
n-FACTOR CORRECTION
TWO-WIRE/SMBus™ SERIAL INTERFACE
MULTIPLE INTERFACE ADDRESSES
DIODE FAULT DETECTION
RoHS COMPLIANT AND NO Sb/Br
DESCRIPTION
The TMP421 and TMP422 are remote temperature
sensor monitors with a built-in local temperature
sensor.
The
remote
temperature
sensor
diode-connected transistors are typically low-cost,
NPN- or PNP-type transistors or diodes that are an
integral part of microcontrollers, microprocessors, or
FPGAs.
Remote accuracy is ±1°C for multiple IC
manufacturers, with no calibration needed. The
Two-Wire serial interface accepts SMBus write byte,
read byte, send byte, and receive byte commands to
configure the device.
the TMP421 and TMP422 include series resistance
cancellation, programmable non-ideality factor, wide
remote temperature measurement range (up to
+150°C), and diode fault detection.
The TMP421 and TMP422 are both available in an
8-lead, SOT23 package.
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2345
APPLICATIONS
•
•
•
•
•
PROCESSOR/FPGA TEMPERATURE
MONITORING
LCD/DLP
®
/LCOS PROJECTORS
SERVERS
CENTRAL OFFICE TELECOM EQUIPMENT
STORAGE AREA NETWORKS (SAN)
V+
8
5
V+
GND
N-Factor
Correction
Status
Register
TMP421
Configuration
Register
V+
8
5
V+
GND
N-Factor
Correction
Status
Register
TMP422
Configuration
Register
Local
Temperature
Register
Conversion
Rate
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
1
DX1
DX2
Local
Temperature
Register
Conversion
Rate
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
1
2
DXP
DXN
Remote
Temperature
Register
Resolution
Register
2
3
Resolution
Register
Remote
Temperature
Register
3
4
A1
A0
Bus
Interface
SCL
7
SDA
6
Pointer
Register
DX3
4
DX4
Bus
Interface
SCL
7
SDA
6
Pointer
Register
1
2
3
4
5
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DLP is a registered trademark of Texas Instruments.
SMBus is a trademark of Intel Corporation.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
Copyright © 2007, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE INFORMATION
(1)
PRODUCT
TMP421
DESCRIPTION
Single-Channel
Remote Junction
Temperature Sensor
Dual Channel
Remote Junction
Temperature Sensor
I
2
C™
ADDRESS
100 11xx
PACKAGE-LEAD
SOT23-8
PACKAGE
DESIGNATOR
DCN
PACKAGE
MARKING
DACI
TMP422
(1)
100 11xx
SOT23-8
DCN
DADI
For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at
www.ti.com.
ABSOLUTE MAXIMUM RATINGS
(1)
Over operating free-air temperature range, unless otherwise noted.
TMP420, TMP421
Power Supply, V
S
Input Voltage
Input Current
Operating Temperature Range
Storage Temperature Range
Junction Temperature (T
J
max)
Human Body Model (HBM)
ESD Rating
Charged Device Model (CDM)
Machine Model (MM)
(1)
Pins 1, 2, 3, and 4 only
Pins 6 and 7 only
+7
–0.5 to V
S
+ 0.5
–0.5 to 7
10
–55 to +127
–60 to +130
+150
3000
1000
200
UNIT
V
V
V
mA
°C
°C
°C
V
V
V
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
2
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Product Folder Link(s):
TMP421 TMP422
Copyright © 2007, Texas Instruments Incorporated
TMP421
TMP422
www.ti.com
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +125°C and V
S
= 2.7V to 5.5V, unless otherwise noted.
TMP421, TMP422
PARAMETER
TEMPERATURE ERROR
Local Temperature Sensor
Remote Temperature Sensor
(1)
TE
LOCAL
TE
REMOTE
T
A
= –40°C to +125°C
T
A
= +15°C to +85°C, V
S
= 3.3V
T
A
= +15°C to +85°C, T
D
= –40°C to +150°C, V
S
= 3.3V
T
A
= –40°C to +100°C, T
D
= –40°C to +150°C, V
S
= 3.3V
T
A
= –40°C to +125°C, T
D
= –40°C to +150°C
vs Supply (Local/Remote)
TEMPERATURE MEASUREMENT
Conversion Time (per channel)
Resolution
Local Temperature Sensor (programmable)
Remote Temperature Sensor
Remote Sensor Source Currents
High
Medium High
Medium Low
Low
Remote Transistor Ideality Factor
SMBus INTERFACE
Logic Input High Voltage (SCL, SDA)
Logic Input Low Voltage (SCL, SDA)
Hysteresis
SMBus Output Low Sink Current
SDA Output Low Voltage
Logic Input Current
SMBus Input Capacitance (SCL, SDA)
SMBus Clock Frequency
SMBus Timeout
SCL Falling Edge to SDA Valid Time
DIGITAL INPUTS
Input Capacitance
Input Logic Levels
Input High Voltage
Input Low Voltage
Leakage Input Current
POWER SUPPLY
Specified Voltage Range
Quiescent Current
V
S
I
Q
0.0625 Conversions per Second
8 Conversions per Second
Serial Bus Inactive, Shutdown Mode
Serial Bus Active, f
S
= 400kHz, Shutdown Mode
Serial Bus Active, f
S
= 3.4MHz, Shutdown Mode
Undervoltage Lockout
Power-On Reset Threshold
TEMPERATURE RANGE
Specified Range
Storage Range
Thermal Resistance, SOT23
θ
JA
–40
–60
100
+125
+130
°C
°C
°C/W
UVLO
POR
2.3
2.7
32
400
3
90
350
2.4
1.6
2.6
2.3
5.5
38
525
10
V
μA
μA
μA
μA
μA
V
V
V
IH
V
IL
I
IN
0V
≤
V
IN
≤
V
S
0.7(V+)
–0.5
(V+)+0.5
0.3(V+)
1
V
V
μA
3
pF
25
30
V
OL
I
OUT
= 6mA
0
≤
V
IN
≤
6V
–1
3
3.4
35
1
6
0.15
0.4
+1
V
IH
V
IL
500
2.1
0.8
V
V
mV
mA
V
μA
pF
MHz
ms
μs
η
TMP421/TMP422 Optimized Ideality Factor
Series Resistance 3kΩ Max
120
60
12
6
1.008
μA
μA
μA
μA
12
12
Bits
Bits
100
115
130
ms
V
S
= 2.7V to 5.5V
±1.25
±0.25
±0.25
±1
±3
±0.2
±2.5
±1.5
±1
±3
±5
±0.5
°C
°C
°C
°C
°C
°C/V
CONDITIONS
MIN
TYP
MAX
UNIT
(1)
Tested with less than 5Ω effective series resistance and 100pF differential input capacitance.
Submit Documentation Feedback
Product Folder Link(s):
TMP421 TMP422
3
Copyright © 2007, Texas Instruments Incorporated
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
www.ti.com
TMP421 PIN CONFIGURATION
DCN PACKAGE
SOT23-8
(TOP VIEW)
DXP
DXN
A1
A0
1
2
TMP421
3
4
6
5
SDA
GND
8
7
V+
SCL
TMP421 PIN ASSIGNMENTS
TMP421
NO.
1
2
3
4
5
6
7
8
NAME
DXP
DXN
A1
A0
GND
SDA
SCL
V+
DESCRIPTION
Positive connection to remote temperature sensor.
Negative connection to remote temperature sensor.
Address pin
Address pin
Ground
Serial data line for SMBus, open-drain; requires pull-up resistor to V+.
Serial clock line for SMBus, open-drain; requires pull-up resistor to V+.
Positive supply voltage (2.7V to 5.5V)
TMP422 PIN CONFIGURATION
DCN PACKAGE
SOT23-8
(TOP VIEW)
DX1
DX2
DX3
DX4
1
2
TMP422
3
4
6
5
SDA
GND
8
7
V+
SCL
TMP422 PIN ASSIGNMENTS
TMP422
NO.
1
2
3
4
5
6
7
8
NAME
DX1
DX2
DX3
DX4
GND
SDA
SCL
V+
DESCRIPTION
Channel 1 remote temperature sensor connection pin. Also sets the TMP422 address; see
Table 10.
Channel 1 remote temperature sensor connection pin. Also sets the TMP422 address; see
Table 10.
Channel 2 remote temperature sensor connection pin. Also sets the TMP422 address; see
Table 10.
Channel 2 remote temperature sensor connection pin. Also sets the TMP422 address; see
Table 10.
Ground
Serial data line for SMBus, open-drain; requires pull-up resistor to V+.
Serial clock line for SMBus, open-drain; requires pull-up resistor to V+.
Positive supply voltage (2.7V to 5.5V)
4
Submit Documentation Feedback
Product Folder Link(s):
TMP421 TMP422
Copyright © 2007, Texas Instruments Incorporated
TMP421
TMP422
www.ti.com
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
TYPICAL CHARACTERISTICS
At T
A
= +25°C and V
S
= +5.0V, unless otherwise noted.
REMOTE TEMPERATURE ERROR
vs TEMPERATURE
3
LOCAL TEMPERATURE ERROR
vs TEMPERATURE
3.0
V
S
= 3.3V
Local Temperature Error (
°C
)
Remote Temperature Error (
°
C)
2
1
0
-1
-2
-3
V
S
= 3.3V
T
REMOTE
= +25
°
C
30 Typical Units Shown
h
= 1.008
50 Units Shown
2.0
1.0
0
-1.0
-2.0
-3.0
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Ambient Temperature, T
A
(
°
C)
Ambient Temperature, T
A
(
°C)
Figure 1.
REMOTE TEMPERATURE ERROR
vs LEAKAGE RESISTANCE
60
40
20
0
R
-
V
S
-20
-40
-60
0
5
10
15
20
25
30
Leakage Resistance (M
W
)
Figure 2.
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE
(Diode-Connected Transistor, 2N3906 PNP)
2.0
Remote Temperature Error (
°C
)
Remote Temperature Error (
°
C)
1.5
V
S
= 2.7V
1.0
0.5
0
V
S
= 5.5V
-0.5
-1.0
-1.5
-2.0
0
500
1000
1500
2000
2500
3000
3500
R
S
(
W
)
R
-
GND
Figure 3.
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE
(GND Collector-Connected Transistor, 2N3906 PNP)
2.0
Remote Temperature Error (
°C
)
Remote Temperature Error (
°
C)
Figure 4.
REMOTE TEMPERATURE ERROR
vs DIFFERENTIAL CAPACITANCE
3
1.5
V
S
= 2.7V
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0
500
1000
1500
2000
2500
3000
3500
R
S
(W)
V
S
= 5.5V
2
1
0
-1
-2
-3
0
0.5
1.0
1.5
2.0
2.5
3.0
Capacitance (nF)
Figure 5.
Figure 6.
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s):
TMP421 TMP422
5
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