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AN2648 Datasheet(PDF) 8 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) 8 Page - STMicroelectronics

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STLM20 temperature-to-output transfer function
AN2648
8/15
Equation 3
The ADC inside the microprocessor is shown in Figure 7.
Figure 7.
ADC in microprocessor
For the ADC output, we have the following, where INT means the integer portion of the
expression:
Substituting Equation 3, we get:
Rearranging, and ignoring the integer notation for now, we get:
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
V
OUT
⋅
⋅
+
⋅
−
+
+
⋅
=
MICROCONTROLLER
A/D
8-bit
CPU
MEM
I/O
VCC = 5V
VOUT
VADC
ai13991
V
V
255
INT
V
OUT
CC
ADC
⎥
⎦
⎤
⎢
⎣
⎡
=
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
V
255
INT
V
CC
ADC
⎥
⎦
⎤
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅
⋅
+
⋅
−
+
+
⋅
=
T
R1
R3
0.01169
R1
R3
1.8663
R1
R2)
(R4
R4
R1)
R3
(
V2
255
V
V
CC
ADC
⋅
⋅
+
⋅
−
+
+
⋅
=
⋅



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