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參數資料
| 型號： | TC818 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| 中文描述： | 自動測距模擬到數字轉換器與數字顯示3-1/2 |
| 文件頁數： | 9/24頁 |
| 文件大?。?/td> | 583K |
| 代理商： | TC818 |
2002 Microchip Technology Inc.
DS21475B-page 9
TC818A
FIGURE 3-2:
RATIOMETRIC RESISTANCE MEASUREMENT FUNCTIONAL DIAGRAM
FIGURE 3-3:
RESISTANCE MEASUREMENT ACCURACY SET BY EXTERNAL
STANDARD RESISTOR
Buffer
TC818A
R6/100k
32
S19
DE
S20
V
CC
-2.6V
1.5k
V
CC
Low Ohms
HI
Ohms
VA
S29
S30
S31
S32
S33
÷
1
÷
10
÷
100
÷
1k
÷
10k
S28
S27
S26
S25
S24
DE
S23
Voltage
Reference
39
38
37
36
35
÷
1
÷
1
÷
1
÷
1
÷
1
Integrator
Comparator
S37
S35
55
54
R
BUF
S12
S13
DE
S18
S21
DE
INT
( + DC)
33
C
REF
0.1μF
R7/100k
31
Analog
Common
29
34
28
10k
57
V
SS
9V
R18
24k
5k
REFHI
220k
49
0.1μF
150k
RVIBUF
47
C
INT
0.1μF
S36
S34
R
X
Unknown
R8
220
(PTC)
V
1
1
R5/1638500
R4/163850
R3/16385
R2/1638.5
R1/163.85
DE +
LO
C
AZ
≈
V
CC
-2.8V
V
CC
+
~
1.5k
~
DE
50
+
–
Example: 200k
Full Scale Measurement
V
R
163.85
220
R
X
+
+
----------163.85k
x0.64
=
(a )
(b)
V
X
X
+
163.85k
220
R
X
+
---------------------------R
x0.64
=
(c) “Ramp Up Voltage” = “Ramp Down Voltage”
.
. .
X
I
C
I
)
-R
X
R
I
C
I
(
)
---V
DE
=
Where:
R
I
= Integrating Resistor, T
I
= Integrate Time
C
I
= Integrating Capacitor, T
DE =
De-integrate Time
(T
DE
)
(d)
R
X
= 163.85
T
I
Independent of R
I
, C
I
or Internal Voltage Reference
163.85k
C
REF
220
R
X
Unknown
To Analog Buffer
100k
VA =
0.64V for Ohms
0.32V for LO Ohms
+
R
S
V
R
V
X
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