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TMP411 Datasheet(PDF) 13 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # TMP411
Description  짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

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TMP411
SBOS383A − FEBRUARY 2007
www.ti.com
13
RESOLUTION REGISTER
The RES1 and RES0 bits (resolution bits 1 and 0) of the
Resolution Register set the resolution of the local
temperature measurement channel. Remote temperature
measurement
channel
resolution
is
not
affected.
Changing the local channel resolution also affects the
conversion time and rate of the TMP411. The Resolution
Register is set by writing to pointer address 1Ah and is
read by reading from pointer address 1Ah. Table 6 shows
the resolution bits for the Resolution Register.
Table 6. Resolution Register:
Local Channel Programmable Resolution
RESOLUTION REGISTER (Read = 1Ah, Write = 1Ah, POR = 1Ch)
RES1
RES0
RESOLUTION
CONVERSION TIME
(Typical)
0
0
9 Bits (0.5
°C)
12.5ms
0
1
10 Bits (0.25
°C)
25ms
1
0
11 Bits (0.125
°C)
50ms
1
1
12 Bits (0.0625
°C)
100ms
Bits 2 through 4 of the Resolution Register must always be
set to ‘1’. Bits 5 through 7 of the Resolution Register must
always be set to ‘0’. The power-on reset value of this
register is 1Ch.
CONVERSION RATE REGISTER
The Conversion Rate Register controls the rate at which
temperature conversions are performed. This register
adjusts the idle time between conversions but not the
conversion timing itself, thereby allowing the TMP411
power dissipation to be balanced with the temperature
register update rate. Table 7 shows the conversion rate
options and corresponding current consumption.
N-FACTOR CORRECTION REGISTER
The TMP411 allows for a different n-factor value to be used
for
converting
remote
channel
measurements
to
temperature. The remote channel uses sequential current
excitation
to
extract
a
differential
VBE
voltage
measurement to determine the temperature of the remote
transistor. Equation 1 relates this voltage and temperature.
V
BE2
* V
BE1
+ nkT
q
ln
I
2
I
1
The value n in Equation 1 is a characteristic of the
particular transistor used for the remote channel. The
default value for the TMP411 is n = 1.008. The value in the
N-Factor Correction Register may be used to adjust the
effective n-factor according to Equation 2 and Equation 3.
n
eff
+ 1.008 @ 300
300
*N
ADJUST
N
ADJUST + 300*
300
@ 1.008
n
eff
The
n-correction
value
must
be
stored
in
two’s-complement format, yielding an effective data range
from −128 to +127. The n-correction value may be written
to and read from pointer address 18h. The register
power-on reset value is 00h, thus having no effect unless
written to.
Table 7. Conversion Rate Register
CONVERSION RATE REGISTER (Read = 04h, Write = 04h, POR = 08h)
AVERAGE IQ (TYP)
(
µA)
R7
R6
R5
R4
R3
R2
R1
R0
CONVERSION/SEC
VS = 2.7V
VS = 5.5V
0
0
0
0
0
0
0
0
0.0625
11
32
0
0
0
0
0
0
0
1
0.125
17
38
0
0
0
0
0
0
1
0
0.25
28
49
0
0
0
0
0
0
1
1
0.5
47
69
0
0
0
0
0
1
0
0
1
80
103
0
0
0
0
0
1
0
1
2
128
155
0
0
0
0
0
1
1
0
4
190
220
07h to 0Fh
8
373
413
(1)
(2)
(3)


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