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TMP411DQDGKRQ1 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 TMP411DQDGKRQ1
상세설명  짹1째C Remote and Local Temperature Sensor With N-Factor and Series Resistance Correction
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홈페이지  http://www.ti.com
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TMP411-Q1
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SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013
SERIES RESISTANCE CANCELLATION
TEMPERATURE MEASUREMENT DATA
Series resistance in an application circuit that typically
Temperature measurement data are taken over a
results
from
printed
circuit
board
(PCB)
trace
default range of 0°C to 127°C for both local and
resistance and remote line length (see Figure 11) is
remote locations. Measurements from –55°C to
automatically
cancelled
by
the
TMP411-Q1,
150°C can be made both locally and remotely by
preventing
what
would
otherwise
result
in
a
reconfiguring
the
TMP411-Q1
for
the
extended
temperature offset.
temperature range. To change the TMP411-Q1
configuration from the standard to the extended
A total of up to 3 k
Ω of series line resistance is
temperature range, switch bit 2 (RANGE) of the
cancelled by the TMP411-Q1, eliminating the need
Configuration Register from low to high.
for additional characterization and temperature offset
correction.
Temperature data resulting from conversions within
the default measurement range are represented in
See the two Remote Temperature Error vs Series
binary form, as shown in Table 2, Standard Binary
Resistance typical characteristics curves (Figure 4
column. Note that any temperature below 0°C results
and Figure 5) for details on the effect of series
in a data value of zero (00h). Likewise, temperatures
resistance and power-supply voltage on sensed
above 127°C result in a value of 127 (7Fh). The
remote temperature error.
device can be set to measure over an extended
temperature
range
by
changing
bit
2
of
the
DIFFERENTIAL INPUT CAPACITANCE
Configuration Register from low to high. The change
in measurement range and data format from standard
The
TMP411-Q1
tolerates
differential
input
binary
to
extended
binary
occurs
at
the
next
capacitance of up to 1000 pF with minimal change in
temperature conversion. For data captured in the
temperature error. The effect of capacitance on
extended temperature range configuration, an offset
sensed remote temperature error is illustrated in
of 64 (40h) is added to the standard binary value, as
typical characteristic Remote Temperature Error vs
shown in Table 1, Extended Binary column. This
Differential Capacitance (Figure 6).
configuration allows measurement of temperatures
below 0°C. Note that binary values corresponding to
temperatures as low as –64°C, and as high as 191°C
are possible; however, most temperature-sensing
diodes only measure with the range of –55°C to
150°C. Additionally, the TMP411-Q1 is rated only for
ambient local temperatures ranging from –40°C to
125°C. Parameters in the Absolute Maximum Ratings
table must be observed.
Table 2. Temperature Data Format
(Local and Remote Temperature High Bytes)
LOCAL/REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (1°C RESOLUTION)
TEMP (°C)
STANDARD BINARY
EXTENDED BINARY
BINARY
HEX
BINARY
HEX
−64
0000 0000
00
0000 0000
00
−50
0000 0000
00
0000 1110
0E
−25
0000 0000
00
0010 0111
27
0
0000 0000
00
0100 0000
40
1
0000 0001
01
0100 0001
41
5
0000 0101
05
0100 0101
45
10
0000 1010
0A
0100 1010
4A
25
0001 1001
19
0101 1001
59
50
0011 0010
32
0111 0010
72
75
0100 1011
4B
1000 1011
8b
100
0110 0100
64
1010 0100
A4
125
0111 1101
7D
1011 1101
BD
127
0111 1111
7F
1011 1111
BF
150
0111 1111
7F
1101 0110
D6
Copyright © 2010–2013, Texas Instruments Incorporated
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