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TMP175AIDGKT 数据表(PDF) 6 Page - Texas Instruments

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部件名 TMP175AIDGKT
功能描述  Digital Temperature Sensor with Two-Wire Interface
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TMP175AIDGKT 数据表(HTML) 6 Page - Texas Instruments

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TMP175
TMP75
SBOS288J − JANUARY 2004 − REVISED DECEMBER 2007
www.ti.com
6
TEMPERATURE
(
°C)
DIGITAL OUTPUT
(BINARY)
HEX
128
0111 1111 1111
7FF
127.9375
0111 1111 1111
7FF
100
0110 0100 0000
640
80
0101 0000 0000
500
75
0100 1011 0000
4B0
50
0011 0010 0000
320
25
0001 1001 0000
190
0.25
0000 0000 0100
004
0
0000 0000 0000
000
−0.25
1111 1111 1100
FFC
−25
1110 0111 0000
E70
−55
1100 1001 0000
C90
Table 5. Temperature Data Format
The user can obtain 9, 10, 11, or 12 bits of resolution by
addressing the Configuration Register and setting the
resolution bits accordingly. For 9-, 10-, or 11-bit resolution,
the most significant bits in the Temperature Register are
used with the unused LSBs set to zero.
CONFIGURATION REGISTER
The Configuration Register is an 8-bit read/write register
used to store bits that control the operational modes of the
temperature sensor. Read/write operations are performed
MSB first. The format of the Configuration Register for the
TMP175 and TMP75 is shown in Table 6, followed by a
breakdown of the register bits. The power-up/reset value
of the Configuration Register is all bits equal to 0.
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
1
OS
R1
R0
F1
F0
POL
TM
SD
Table 6. Configuration Register Format
SHUTDOWN MODE (SD)
The Shutdown Mode of the TMP175 and TMP75 allows
the user to save maximum power by shutting down all
device circuitry other than the serial interface, which
reduces current consumption to typically less than 0.1
µA.
Shutdown Mode is enabled when the SD bit is 1; the device
will shut down once the current conversion is completed.
When SD is equal to 0, the device will maintain a
continuous conversion state.
THERMOSTAT MODE (TM)
The Thermostat Mode bit of the TMP175 and TMP75
indicates to the device whether to operate in Comparator
Mode (TM = 0) or Interrupt Mode (TM = 1). For more
information on comparator and interrupt modes, see the
High and Low Limit Registers section.
POLARITY (POL)
The Polarity Bit of the TMP175 and TMP75 allows the user
to adjust the polarity of the ALERT pin output. If POL = 0,
the ALERT pin will be active LOW, as shown in Figure 3.
For POL = 1, the ALERT pin will be active HIGH, and the
state of the ALERT pin is inverted.
Measured
Temperature
T
HIGH
T
LOW
TMP75/TMP175 ALERT PIN
(Comparator Mode)
POL = 0
TMP75/TMP175 ALERT PIN
(Interrupt Mode)
POL = 0
TMP75/TMP175 ALERT PIN
(Comparator Mode)
POL = 1
TMP75/TMP175 ALERT PIN
(Interrupt Mode)
POL = 1
Read
Read
Time
Read
Figure 3. Output Transfer Function Diagrams
FAULT QUEUE (F1/F0)
A fault condition is defined as when the measured
temperature exceeds the user-defined limits set in the
THIGH and TLOW Registers. Additionally, the number of
fault conditions required to generate an alert may be
programmed using the fault queue. The fault queue is
provided to prevent a false alert as a result of
environmental
noise.
The
fault
queue
requires
consecutive fault measurements in order to trigger the
alert function. Table 7 defines the number of measured
faults that may be programmed to trigger an alert condition
in the device. For THIGH and TLOW register format and byte
order, see the section High and Low Limit Registers.
F1
F0
CONSECUTIVE FAULTS
0
0
1
0
1
2
1
0
4
1
1
6
Table 7. Fault Settings of the TMP175 and TMP75
CONVERTER RESOLUTION (R1/R0)
The Converter Resolution Bits control the resolution of the
internal Analog-to-Digital (A/D) converter. This allows the
user to maximize efficiency by programming for higher


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