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AN2648 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2648
Description  Increasing the resolution of analog temperature sensors
PDF  15 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2648 Datasheet(HTML) 10 Page - STMicroelectronics

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STLM20 temperature-to-output transfer function
AN2648
10/15
VSUM4 = 4 samples of VADC, range 0 to 1020.
Rearranging and ignoring the integer operator, we get:
Equation 5
This is a linear equation and has the form:
Equation 5b
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
V
255
INT
4
V
CC
SUM4
⎥
⎦
⎤
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅
⋅
+
⋅
−
+
+
⋅
⋅
=
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
1020
V
V
CC
SUM4
⋅
⋅
+
⋅
−
+
+
⋅
=
⋅
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
1020
V
V
CC
SUM4
⋅
⋅
=
⋅
+
+
+
⋅
−
⋅
T
R3
R1
R1
R3
0.01169
R3
R1
R1
R3
1.8663
R3
R1
R1
R2)
(R4
R4
R1)
R3
(
V2
R3
R1
1020
V
V
CC
SUM4
⋅
⋅
⋅
=
⋅
⋅
+
⋅
+
+
⋅
−
⋅
⋅
T
0.01169
1.8663
R3
R2)
(R4
R4
R1)
R3
(
V2
R3
R1
1020
V
V
CC
SUM4
⋅
=
+
+
+
⋅
−
⋅
⋅
0.01169
1.8663
0.01169
1
R3
R2)
(R4
R4
R1)
R3
(
V2
0.01169
1
R3
R1
1020
V
V
T
T
CC
SUM4
MEAS4
+
⋅
+
+
⋅
−
⋅
⋅
⋅
=
=
O
S
SUM4
MEAS4
K
/4
K
V
T
+
⋅
=



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