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TMP422AIDCNR Fiches technique(PDF) 8 Page - Burr-Brown (TI)

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No de pièce TMP422AIDCNR
Description  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

TMP422AIDCNR Fiches technique(HTML) 8 Page - Burr-Brown (TI)

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SERIES RESISTANCE CANCELLATION
DIFFERENTIAL INPUT CAPACITANCE
TEMPERATURE MEASUREMENT DATA
Standard Binary Temperature Data Calculation
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
Table 1. Temperature Data Format (Local and
Remote Temperature High Bytes)
Series resistance in an application circuit that typically
LOCAL/REMOTE TEMPERATURE REGISTER
results
from
printed
circuit
board
(PCB)
trace
HIGH BYTE VALUE (1
°C RESOLUTION)
resistance and remote line length (see Figure 11) is
STANDARD BINARY
EXTENDED BINARY
TEMP
automatically
cancelled
by
the
TMP421/22,
(
°C)
BINARY
HEX
BINARY
HEX
preventing
what
would
otherwise
result
in
a
–64
1100 0000
C0
0000 0000
00
temperature offset. A total of up to 3k
Ω of series line
–50
1100 1110
CE
0000 1110
0E
resistance is cancelled by the TMP421/22, eliminating
–25
1110 0111
E7
0010 0111
27
the
need
for
additional
characterization
and
0
0000 0000
00
0100 0000
40
temperature offset correction. See the two Remote
Temperature Error vs Series Resistance typical
1
0000 0001
01
0100 0001
41
characteristic curves (Figure 4 and Figure 5) for
5
0000 0101
05
0100 0101
45
details on the effect of series resistance and
10
0000 1010
0A
0100 1010
4A
power-supply voltage on sensed remote temperature
25
0001 1001
19
0101 1001
59
error.
50
0011 0010
32
0111 0010
72
75
0100 1011
4B
1000 1011
8B
100
0110 0100
64
1010 0100
A4
The TMP421/22 tolerate differential input capacitance
125
0111 1101
7D
1011 1101
BD
of up to 1000pF with minimal change in temperature
127
0111 1111
7F
1011 1111
BF
error. The effect of capacitance on sensed remote
150
0111 1111
7F
1101 0110
D6
temperature error is illustrated in Figure 6, Remote
175
0111 1111
7F
1110 1111
EF
Temperature Error vs Differential Capacitance.
191
0111 1111
7F
1111 1111
FF
(1) Resolution is 1
°C/count. Negative numbers are represented in
Two's Complement format.
Temperature measurement data are taken over a
(2) Resolution is 1
°C/count. All values are unsigned with a –64°C
default range of –55
°C to +127°C for both local and
offset.
remote locations. Measurements from –55
°C to
Both local and remote temperature data use two
+150
°C can be made both locally and remotely by
bytes for data storage. The high byte stores the
reconfiguring
the
TMP421/22
for
the
extended
temperature with 1
°C resolution. The second or low
temperature range. To change the TMP421 and
byte
stores
the
decimal
fraction
value
of
the
TMP422 configuration from the standard to the
temperature
and
allows
a
higher
measurement
extended temperature range, switch bit 2 (RANGE) of
resolution; see Table 2. The measurement resolution
the Configuration Register from low to high.
for the both the local and remote channels is
Temperature data resulting from conversions within
0.0625
°C, and is not adjustable.
the default measurement range are represented in
binary form, as shown in Table 1, Standard Binary
column. Note that any temperature below –64
°C
Example
results in a data value of –64 (C0h). Likewise,
For positive temperatures (for example, 20
°C):
temperatures above +127
°C result in a value of 127
(20
°C)/(1°C/count) = 20 → 14h → 0001 0100
(7Fh). The device can be set to measure over an
extended temperature range by changing bit 2 of
Two's Complement is not performed on positive
Configuration Register 1 from low to high. The
numbers. Simply convert the number to binary
change in measurement range and data format from
code
with
8-bit,
right-justified
format,
and
standard binary to extended binary occurs at the next
MSB = '0' to denote a positive sign.
temperature conversion. For data captured in the
20
°C is stored as 0001 0100 → 14h.
extended temperature range configuration, an offset
For negative temperatures (for example, –20C):
of 64 (40h) is added to the standard binary value, as
shown in the Extended Binary column of Table 1.
(|–20|)/(1
°C/count) = 20 → 14h → 0001 0100
This
configuration
allows
measurement
of
Generate the Two's Complement of a negative
temperatures as low as –64
°C, and as high as
number by complementing the absolute value
+191
°C; however, most temperature-sensing diodes
binary number and adding 1.
only measure with the range of –55
°C to +150°C.
–20
°C is stored as 1110 1100 → ECh.
Additionally, the TMP421/22 are rated only for
ambient temperatures ranging from –40
°C to +125°C.
Parameters in the Absolute Maximum Ratings table
must be observed.
8
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TMP421 TMP422


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