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TMP442 Datasheet(PDF) 14 Page - Texas Instruments

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Part # TMP442
Description  짹1째C TEMPERATURE SENSOR with Automatic Beta Compensation,Series-R, and h-Factor in a SOT23-8
PDF  29 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMP442 Datasheet(HTML) 14 Page - Texas Instruments

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BETA COMPENSATION CONFIGURATION
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 .............................................................................................................................................. www.ti.com
continue to be GND collector-connected in this mode,
REGISTER
but no beta compensation is applied. When the beta
compensation configuration is set to '0111' or the
If the Beta Compensation Configuration Register is
sensor is diode-connected (base shorted to collector),
set to '1xxx' (beta compensation enabled) for a given
the
η-factor used by the TMP441/42 is 1.008. When
channel at the beginning of
each
temperature
the beta compensation configuration is set to '1xxx'
conversion, the TMP441/42 automatically detects if
(beta compensation enabled) and the sensor is GND
the
sensor
is
diode-connected
or
GND
collector-connected (PNP collector to ground), the
collector-connected, selects the proper beta range,
η-factor used by the TMP441/42 is 1.000. Table 8
and measures the sensor temperature appropriately.
shows the read values for the selected beta ranges
and
the
appropriate
η-Factor used for each
If the Beta Compensation Configuration Register is
conversion.
set to '0111' (beta compensation disabled) for a given
channel, the automatic detection is bypassed and the
temperature
is
measured
assuming
a
diode-connected sensor. A PNP transistor may
Table 7. Conversion Rate Register
CONVERSION RATE REGISTER (Read/Write = 0Bh, POR = 07h)
AVERAGE IQ (TYP) (µA),
VS = 5.5V
R7
R6
R5
R4
R3
R2
R1
R0
CONVERSIONS/SEC
TMP441
TMP442
0
0
0
0
0
0
0
0
0.0625
30
35
0
0
0
0
0
0
0
1
0.125
35
44
0
0
0
0
0
0
1
0
0.25
45
62
0
0
0
0
0
0
1
1
0.5
65
99
0
0
0
0
0
1
0
0
1
103
162
0
0
0
0
0
1
0
1
2
181
272
0
0
0
0
0
1
1
0
4
332
437
0
0
0
0
0
1
1
1
8(1)
634
652
(1)
Conversion rate depends on which channels are enabled.
Table 8. Beta Compensation Configuration Register
BCx3-BCx0
BETA RANGE DESCRIPTION
N
TIME
1000
Automatically selected range 0 (0.10 < beta < 0.18)
1.000
126ms
1001
Automatically selected range 1 (0.16 < beta < 0.26)
1.000
126ms
1010
Automatically selected range 2 (0.24 < beta < 0.43)
1.000
126ms
1011
Automatically selected range 3 (0.35 < beta < 0.78)
1.000
126ms
1100
Automatically selected range 4 (0.64 < beta < 1.8)
1.000
126ms
1101
Automatically selected range 5 (1.4 < beta < 9.0)
1.000
126ms
1110
Automatically selected range 6 (6.7 < beta < 40.0)
1.000
126ms
1111
Automatically selected range 7 (beta > 27.0)
1.000
126ms
1111
Automatically detected diode connected sensor
1.008
93ms
0000
Manually selected range 0 (0.10 < beta < 0.5)
1.000
93ms
0001
Manually selected range 1 (0.13 < beta < 1.0)
1.000
93ms
0010
Manually selected range 2 (0.18 < beta < 2.0)
1.000
93ms
0011
Manually selected range 3 (0.3 < beta < 25)
1.000
93ms
0100
Manually selected range 4 (0.5 < beta < 50)
1.000
93ms
0101
Manually selected range 5 (1.1 < beta < 100)
1.000
93ms
0110
Manually selected range 6 (2.4 < beta < 150)
1.000
93ms
0111
Manually disabled beta correction
1.008
93ms
14
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Product Folder Link(s): TMP441 TMP442



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