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TMP175 Scheda tecnica(PDF) 5 Page - Texas Instruments

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Il numero della parte TMP175
Spiegazioni elettronici  Digital Temperature Sensor with Two-Wire Interface
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TMP175 Scheda tecnica(HTML) 5 Page - Texas Instruments

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TMP175, 75
SBOS288C
www.ti.com
5
APPLICATIONS INFORMATION
The TMP175 and TMP75 are digital temperature sensors
that are optimal for thermal management and thermal protec-
tion applications. The TMP175 and TMP75 are Two-Wire
and SMBus interface-compatible, and are specified over a
temperature range of –40°C to +125°C.
The TMP175 and TMP75 require 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.
TEMPERATURE REGISTER
The Temperature Register of the TMP175 or TMP75 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 III and Table IV. The first 12 bits
are used to indicate temperature, with all remaining bits equal
to zero. Data format for temperature is summarized in Table
V. Following power-up or reset, the Temperature Register will
read 0°C until the first conversion is complete.
FIGURE 1. Typical Connections of the TMP175 and TMP75.
The sensing device of the TMP175 and TMP75 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 accu-
rate surface temperature measurement.
POINTER REGISTER
Figure 2 shows the internal register structure of the TMP175
and TMP75. The 8-bit Pointer Register of the devices are
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 I identifies
the bits of the Pointer Register byte. Table II describes the
pointer address of the registers available in the TMP175 and
TMP75. 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 I. Pointer Register Byte.
P1
P0
REGISTER
0
0
Temperature Register (READ Only)
0
1
Configuration Register (READ/WRITE)
10
TLOW Register (READ/WRITE)
11
THIGH Register (READ/WRITE)
TABLE II. Pointer Addresses of the TMP175 and TMP75
Registers.
D7
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
TABLE III. Byte 1 of Temperature Register.
D7
D6
D5
D4
D3
D2
D1
D0
T3
T2
T1
T0
0
0
0
0
TABLE IV. Byte 2 of Temperature Register.
FIGURE 2. Internal Register Structure of TMP175 and TMP75.
TMP175
TMP75
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.
I/O
Control
Interface
SCL
SDA
Temperature
Register
Configuration
Register
T
LOW
Register
T
HIGH
Register
Pointer
Register


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