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參數(shù)資料
| 型號： | TMP435ADGST |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 10/31頁 |
| 文件大小： | 477K |
| 代理商： | TMP435ADGST |
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V
=
-
BE2
BE1
ln
nkT
q
()
I
2
1
1.008
300
N
-
ADJUST
neff =
300
1.008
neff
N
ADJUST
=300 -
1.000
300
N
-
ADJUST
neff =
300
1.000
neff
N
ADJUST
=300 -
SBOS495A – MARCH 2010 – REVISED APRIL 2010
www.ti.com
n-Factor Correction Register
range from –128 to +127. Table 9 shows the n-factor
range for both 1.008 and 1.000. For the TMP435, the
The TMP435 allows for a different n-factor value to
n-correction value may be written to and read from
be
used
for
converting
remote
channel
pointer address 18h. The register power-on reset
measurements to temperature. The remote channel
value is 00h, thus having no effect unless written to.
uses
sequential
current
excitation
to
extract
a
differential VBE voltage measurement to determine
Table 9. n-Factor Range
the temperature of the remote transistor. Equation 1
NADJUST
relates this voltage and temperature.
BINARY
HEX
DECIMAL
n-FACTOR
01111111
7F
127
1.747977
(1)
00001010
0A
10
1.042759
The value n in Equation 1 is a characteristic of the
00001000
08
8
1.035616
particular transistor used for the remote channel.
00000110
06
6
1.028571
When the beta compensation configuration is set to
00000100
04
4
1.021622
'0111' (beta compensation disabled) or the sensor is
diode-connected (base shorted to collector), the
00000010
02
2
1.014765
n-factor used by the TMP435 is 1.008. When the beta
00000001
01
1
1.011371
compensation configuration is set to '1000' (beta
00000000
00
0
1.008
compensation enabled) and the sensor is GND
11111111
FF
–1
1.004651
collector-connected (PNP collector to ground), the
11111110
FE
–2
1.001325
n-factor used by the TMP435 is 1.000. If the n-factor
used for the temperature conversion does not match
11111100
FC
–4
0.994737
the characteristic of the sensor, then temperature
11111010
FA
–6
0.988235
offset is observed. The value in the n-Factor
11111000
F8
–8
0.981818
Correction Register may be used to adjust the
11110110
F6
–10
0.975484
effective n-factor according to Equation 2 and
10000000
80
–128
0.706542
Equation 3 for disabled beta compensation or a
diode-connected sensor. Equation 4 and Equation 5
space
may be used for enabled beta compensation and a
GND collector-connected sensor.
Software Reset
The TMP435 may be reset by writing any value to
(2)
Pointer Register FCh. This action restores the
power-on reset state to all of the TMP435 registers as
(3)
well as abort any conversion in process and clear the
ALERT and THERM pins.
The TMP435 also supports reset via the two-wire
(4)
general
call
address
(00000000).
The
TMP435
acknowledges the general call address and responds
(5)
to the second byte. If the second byte is 00000110,
the TMP435 executes a software reset. The TMP435
The
n-correction
value
must
be
stored
in
does not respond to other values in the second byte.
twos-complement format, yielding an effective data
18
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TMP435
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