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TMP275AID 数据表(PDF) 5 Page - Texas Instruments

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部件名 TMP275AID
功能描述  0.5 C Digital Out Temperature Sensor
Download  19 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TMP275AID 数据表(HTML) 5 Page - Texas Instruments

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TMP275
SBOS363D − JUNE 2006 − REVISED AUGUST 2007
www.ti.com
5
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
0.1
µF bypass capacitor is
recommended, as shown in Figure 1.
TMP275
0.1
µF
V+
GND
4
3
7
8
ALERT
(Output)
A
0
6
A
1
5
A
2
2
1
SCL
SDA
To
Two−Wire
Controller
NOTE:SCL,SDA,and ALERT
pins require pull−up resistors.
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.
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
P6
P5
P4
P3
P2
P1
P0
0
0
0
0
0
0
Register Bits
Table 1. Pointer Register Byte
I/O
Control
Interface
SCL
SDA
Temperature
Register
Configuration
Register
T
LOW
Register
T
HIGH
Register
Pointer
Register
Figure 2. Internal Register Structure of the
TMP275
P1
P0
REGISTER
0
0
Temperature Register (READ Only)
0
1
Configuration Register (READ/WRITE)
1
0
TLOW Register (READ/WRITE)
1
1
THIGH Register (READ/WRITE)
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
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
Table 3. Byte 1 of Temperature Register
D7
D6
D5
D4
D3
D2
D1
D0
T3
T2
T1
T0
0
0
0
0
Table 4. Byte 2 of Temperature Register


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