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參數資料
| 型號： | TMP03FRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Serial Digital Output Thermometers |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 1.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | TSSOP-8 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 375K |
| 代理商： | TMP03FRU |
TMP03/TMP04
REV. 0
–5–
Table I. Counter Size and Clock Frequency Effects on Quantization Error
Maximum
Count Available
Maximum
Temp Required
Maximum
Frequency
Quantization
Error (+25
8
C)
Quantization
Error (+77
8
F)
4096
8192
16384
+125
°
C
+125
°
C
+125
°
C
94 kHz
188 kHz
376 kHz
0.284
°
C
0.142
°
C
0.071
°
C
0.512
°
F
0.256
°
F
0.128
°
F
Optimizing Counter Characteristics
Counter resolution, clock rate, and the resultant temperature
decode error that occurs using a counter scheme may be
determined from the following calculations:
1. T1 is nominally 10 ms, and compared to T2 is relatively
insensitive to temperature changes. A useful worst-case
assumption is that T1 will never exceed 12 ms over the
specified temperature range.
T1 max = 12 ms
Substituting this value for T1 in the formula, temperature
(
°
C) = 235 – ([T1/T2]
×
400), yields a maximum value of
T2 of 44 ms at 125
°
C. Rearranging the formula allows the
maximum value of T2 to be calculated at any maximum
operating temperature:
T2 (Temp) = (T1max
×
400)/(235 – Temp) in seconds
2. We now need to calculate the maximum clock frequency we
can apply to the gated counter so it will not overflow during
T2 time measurement. The maximum frequency is calculated
using:
Frequency (max) = Counter Size/ (T2 at maximum
temperature)
Substituting in the equation using a 12-bit counter gives,
Fmax = 4096/44 ms
.
94 kHz.
3. Now we can calculate the temperature resolution, or
quantization error, provided by the counter at the chosen
clock frequency and temperature of interest. Again, using a
12-bit counter being clocked at 90 kHz (to allow for ~5%
temperature over-range), the temperature resolution at
+25
°
C is calculated from:
Quantization Error (
°
C) =
400
×
([Count
1
/Count
2
] –
[Count
1
–
1
]/[Count
2
+
1
])
Quantization Error (
°
F) =
720
×
([Count
1
/Count
2
] –
[Count
1
–
1
]/[Count
2
+
1
])
where,
Count1
= T1max
×
Frequency, and
Count2
=
T2 (Temp)
×
Frequency. At +25
°
C this gives a resolution of
better than 0.3
°
C. Note that the temperature resolution
calculated from these equations improves as temperature
increases. Higher temperature resolution will be obtained by
employing larger counters as shown in Table I. The internal
quantization error of the TMP03/TMP04 sets a theoretical
minimum resolution of approximately 0.1
°
C at +25
°
C.
Self-Heating Effects
The temperature measurement accuracy of the TMP03/TMP04
may be degraded in some applications due to self-heating.
Errors introduced are from the quiescent dissipation, and power
dissipated by the digital output. The magnitude of these
temperature errors is dependent on the thermal conductivity of
the TMP03/TMP04 package, the mounting technique, and
effects of airflow. Static dissipation in the TMP03/TMP04 is
typically 4.5 mW operating at 5 V with no load. In the TO-92
package mounted in free air, this accounts for a temperature
increase due to self-heating of
T
=
P
DISS
×
Θ
JA
= 4.5
mW
×
162
°
C/W
= 0.73
°
C
(1.3
°
F
)
For a free-standing surface-mount TSSOP package, the
temperature increase due to self-heating would be
T
=
P
DISS
×
Θ
JA
= 4.5
mW
×
240
°
C/W
= 1.08
°
C
(1.9
°
F
)
In addition, power is dissipated by the digital output which is
capable of sinking 800
μ
A continuous (TMP04). Under full
load, the output may dissipate
P
DISS
=
0.6
V
(
)
0.8
mA
(
)
T
2
T
1
+
T
2
For example with T2 = 20 ms and T1 = 10 ms, the power
dissipation due to the digital output is approximately 0.32mW
with a 0.8 mA load. In a free-standing TSSOP package this
accounts for a temperature increase due to output self-heating
of
T
=
P
DISS
×
Θ
JA
= 0.32
mW
×
240
°
C/W
= 0.08
°
C
(0.14
°
F
)
This temperature increase adds directly to that from the
quiescent dissipation and affects the accuracy of the TMP03/
TMP04 relative to the true ambient temperature. Alternatively,
when the same package has been bonded to a large plate or
other thermal mass (effectively a large heatsink) to measure its
temperature, the total self-heating error would be reduced to
approximately
T
=
P
DISS
×
Θ
JC
= (4.5
mW
+ 0.32
mW
)
×
43
°
C/W
= 0.21
°
C
(0.37
°
F
)
Calibration
The TMP03 and TMP04 are laser-trimmed for accuracy and
linearity during manufacture and, in most cases, no further
adjustments are required. However, some improvement in
performance can be gained by additional system calibration. To
perform a single-point calibration at room temperature, measure
the TMP03/TMP04 output, record the actual measurement
temperature, and modify the offset constant (normally 235; see
the Output Encoding section) as follows:
Offset Constant =
235
+
(
T
OBSERVED
– T
TMP03OUTPUT
)
A more complicated two-point calibration is also possible. This
involves measuring the TMP03/TMP04 output at two temp-
eratures, Temp1 and Temp2, and modifying the slope constant
(normally 400) as follows:
Slope Constant
=
Temp
2
Temp
1
T
1@
Temp
1
T
2 @
Temp
1
T
1@
Temp
2
T
2 @
Temp
2
where
T
1 and
T
2 are the output high and output low times,
respectively.
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