TMP275
SBOS363A − JUNE 2006 − REVISED JUNE 2006
0.5°C Digital Out Temperature Sensor
FEATURES
D
D
D
D
8 ADDRESSES
DIGITAL OUTPUT: Two-Wire Serial Interface
RESOLUTION: 9- to 12-Bits, User-Selectable
ACCURACY:
±0.5°C
(max) from +10°C to +85°C
±0.75°C
(max) from +0°C to +100°C
50µA, 0.1µA Standby
DESCRIPTION
The TMP275 is a 0.5°C accurate, two-wire, serial output
temperature sensor available in the MSOP-8 package. The
TMP275 is capable of reading temperatures with a resolution
of 0.0625°C.
The TMP275 is SMBus-compatible and allows up to eight
devices on one bus. It is ideal for extended temperature
measurement in a variety of communication, computer,
consumer, environmental, industrial, and instrumentation
applications.
The TMP275 is specified for operation over a temperature
range of −40°C to +125°C.
Temperature
1
Diode
Temp.
Sensor
Control
Logic
8
D
LOW QUIESCENT CURRENT:
D
WIDE SUPPLY RANGE: 2.7V to 5.5V
D
SMALL MSOP-8 PACKAGE
APPLICATIONS
D
POWER-SUPPLY TEMPERATURE
MONITORING
SDA
V+
D
COMPUTER PERIPHERAL THERMAL
PROTECTION
D
D
D
D
D
D
D
NOTEBOOK COMPUTERS
CELL PHONES
BATTERY MANAGEMENT
OFFICE MACHINES
THERMOSTAT CONTROLS
ENVIRONMENTAL MONITORING AND HVAC
ELECTROMECHANICAL DEVICE
TEMPERATURE
TEMPERATURE ERROR AT 25_C
SCL
2
∆Σ
A/D
Converter
Serial
Interface
7
A0
ALERT
3
6
A1
GND
4
OSC
Config.
and Temp.
Register
5
A2
TMP275
TEMPERATURE ERROR vs TEMPERATURE
0.500
0.375
Temperature Error (_C)
0.250
0.125
0
−0.125
−0.250
−0.375
36 Units Shown
−55
−35
−15
5
25
45
65
85
105
125 130
Population
−0.50
−0.45
−0.30
−0.20
−0.10
0.00
0.10
0.20
0.30
0.40
Temperature Error (
_
C)
0.50
−0.500
Temperature (_ C)
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
2006, Texas Instruments Incorporated
www.ti.com
TMP275
www.ti.com
SBOS363A − JUNE 2006 − REVISED JUNE 2006
ABSOLUTE MAXIMUM RATINGS
(1)
Power Supply, V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0V
Input Voltage(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5V to 7.0V
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Operating Temperature Range . . . . . . . . . . . . . . . −55°C to +127°C
Storage Temperature Range . . . . . . . . . . . . . . . . . −60°C to +130°C
Junction Temperature (TJ max) . . . . . . . . . . . . . . . . . . . . . . +150°C
ESD Rating:
Human Body Model (HBM) . . . . . . . . . . . . . . . . . . . . . . . 4000V
Charged Device Model (CDM) . . . . . . . . . . . . . . . . . . . . 1000V
Machine Model (MM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300V
(1) 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 supported.
(2) Input voltage rating applies to all TMP275 input voltages.
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.
ORDERING INFORMATION
(1)
PRODUCT
TMP275
PACKAGE-LEAD
MSOP-8
PACKAGE DESIGNATOR
DGK
PACKAGE MARKING
T275
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website
at www.ti.com.
PIN ASSIGNMENTS
Top View
SDA
SCL
ALERT
GND
1
8
V+
A0
A1
A2
T275
MSOP−8
2
3
4
7
6
5
NOTE: Pin 1 is determined by orienting the package marking as indicated in the diagram.
2
TMP275
www.ti.com
SBOS363A − JUNE 2006 − REVISED JUNE 2006
ELECTRICAL CHARACTERISTICS
At TA = −40°C to +125°C, and V+ = 2.7V to 5.5V, unless otherwise noted.
TMP275
PARAMETER
TEMPERATURE INPUT
Range
Accuracy (Temperature Error)
+10°C to +85°C, V+ = 3.3V
0°C to +100°C, V+ = 3.0V to 3.6V
−40°C to +125°C, V+ = 3.0V to 3.6V
+25°C to +100°C, V+ = 3.3V to 5.5V
Resolution(1)
DIGITAL INPUT/OUTPUT
Input Capacitance
Input Logic Levels:
VIH
VIL
Leakage Input Current, IIN
Input Voltage Hysteresis
Output Logic Levels:
VOL SDA
VOL ALERT
Resolution
Conversion Time
IOL = 3mA
IOL = 4mA
Selectable
9-Bit
10-Bit
11-Bit
12-Bit
Timeout Time
POWER SUPPLY
Operating Range
Quiescent Current
IQ
Serial Bus Inactive
Serial Bus Active, SCL Freq = 400kHz
Serial Bus Active, SCL Freq = 3.4MHz
Shutdown Current
ISD
Serial Bus Inactive
Serial Bus Active, SCL Freq = 400kHz
Serial Bus Active, SCL Freq = 3.4MHz
TEMPERATURE RANGE
Specified Range
Operating Range
Thermal Resistance
MSOP-8
(1) Specified for 12-bit resolution.
q
JA
250
°C/W
−40
−55
+125
+127
°C
°C
2.7
50
100
410
0.1
60
380
3
5.5
85
V
µA
µA
µA
µA
µA
µA
25
0
0
0.15
0.15
9 to 12
27.5
55
110
220
54
37.5
75
150
300
74
0.4
0.4
V
V
Bits
ms
ms
ms
ms
ms
0V
≤
VIN
≤
6V
SCL and SDA Pins
500
0.7(V+)
−0.5
6.0
0.3(V+)
1
V
V
µA
mV
3
pF
Selectable
−40
±0.0625
±0.0625
±0.0625
0.2
+0.0625
+125
±0.5
±0.75
±1
±1.5
°C
°C
°C
°C
°C
°C
CONDITION
MIN
TYP
MAX
UNITS
3
TMP275
www.ti.com
SBOS363A − JUNE 2006 − REVISED JUNE 2006
TYPICAL CHARACTERISTICS
At TA = +25°C and V+ = 5.0V, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
85
75
65
I
SD
(µA)
I
Q
(µA)
V+ = 5V
55
45
V+ = 2.7V
35
Serial Bus Inactive
25
−55
−35
−15
5
25
45
65
85
105
125 130
Temperature (_ C)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
−0.1
−55
SHUTDOWN CURRENT vs TEMPERATURE
−35
−15
5
25
45
65
85
105
125 130
Temperature (
_
C)
CONVERSION TIME vs TEMPERATURE
300
0.500
0.375
Conversion Time (ms)
Temperature Error (_C)
250
V+ = 5V
0.250
0.125
0
−0.125
−0.250
−0.375
−0.500
TEMPERATURE ERROR vs TEMPERATURE
200
V+ = 2.7V
150
12−bit resolution.
100
−55
−35
−15
5
25
45
65
85
105
125 130
Temperature (
_
C)
36 Units Shown
−55
−35
−15
5
25
45
65
85
105
125 130
Temperature (_ C)
QUIESCENT CURRENT WITH
BUS ACTIVITY vs TEMPERATURE
500
450
400
Population
350
I
Q
(
µ
A)
300
250
200
150
100
50
0
1k
10k
100k
Frequency (Hz)
25_ C
−55_C
1M
10M
125
_
C
Hs MODE
FAST MODE
TEMPERATURE ERROR AT 25_ C
−0.50
−0.45
−0.30
−0.20
−0.10
0.00
0.10
0.20
0.30
0.40
Temperature Error (_ C)
4
0.50
TMP275
www.ti.com
SBOS363A − JUNE 2006 − REVISED JUNE 2006
APPLICATIONS INFORMATION
The TMP275 is a digital temperature sensor that is optimal
for thermal management and thermal protection
applications. The TMP275 is Two-Wire and SMBus
interface-compatible, and is specified over a temperature
range of −40°C to +125°C.
The TMP275 requires no external components for
operation except for pull-up resistors on SCL, SDA, and
ALERT, although a 0.1µF bypass capacitor is
recommended, as shown in Figure 1.
V+
Pointer
Register
Temperature
Register
Configuration
Register
SCL
I/O
Control
Interface
SDA
T
LOW
Register
0.1µF
8
To
Two−Wire
Controller
SCL
SDA
2
1
TMP275
7
6
5
3
4
A
0
A
1
A
2
ALERT
(Output)
T
HIGH
Register
Figure 2. Internal Register Structure of the
TMP275
P1
0
0
1
1
P0
0
1
0
1
REGISTER
Temperature Register (READ Only)
Configuration Register (READ/WRITE)
TLOW Register (READ/WRITE)
THIGH Register (READ/WRITE)
NOTE: SCL, SDA, and ALERT
pins require pull−up resistors.
GND
Figure 1. Typical Connections of the TMP275
The sensing device of the TMP275 is the chip itself.
Thermal paths run through the package leads as well as
the plastic package. The lower thermal resistance of metal
causes the leads to provide the primary thermal path.
To maintain accuracy in applications requiring air or
surface temperature measurement, care should be taken
to isolate the package and leads from ambient air
temperature. A thermally-conductive adhesive will assist
in achieving accurate surface temperature measurement.
Table 2. Pointer Addresses of the TMP275
TEMPERATURE REGISTER
The Temperature Register of the TMP275 is a 12-bit,
read-only register that stores the output of the most recent
conversion. Two bytes must be read to obtain data, and are
described in Table 3 and Table 4. Note that byte 1 is the
most significant byte, followed by byte 2, the least
significant byte. The first 12 bits are used to indicate
temperature, with all remaining bits equal to zero. The
least significant byte does not have to be read if that
information is not needed. Data format for temperature is
summarized in Table 5. Following power-up or reset, the
Temperature Register will read 0°C until the first
conversion is complete.
D7
T11
D6
T10
D5
T9
D4
T8
D3
T7
D2
T6
D1
T5
D0
T4
POINTER REGISTER
Figure 2 shows the internal register structure of the
TMP275. The 8-bit Pointer Register of the devices is used
to address a given data register. The Pointer Register uses
the two LSBs to identify which of the data registers should
respond to a read or write command. Table 1 identifies the
bits of the Pointer Register byte. Table 2 describes the
pointer address of the registers available in the TMP275.
Power-up reset value of P1/P0 is 00.
P7
0
P6
0
P5
0
P4
0
P3
0
P2
0
P1
P0
Table 3. Byte 1 of Temperature Register
D7
T3
D6
T2
D5
T1
D4
T0
D3
0
D2
0
D1
0
D0
0
Register Bits
Table 4. Byte 2 of Temperature Register
Table 1. Pointer Register Byte
5
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