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TC815CBU датащи(PDF) 8 Page - Microchip Technology

номер детали TC815CBU
подробное описание детали  3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function
Download  26 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC815CBU датащи(HTML) 8 Page - Microchip Technology

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TC815
DS21474B-page 8
© 2002 Microchip Technology Inc.
FIGURE 3-1:
RATIOMETRIC RESISTANCE MEASUREMENT FUNCTIONAL DIAGRAM
FIGURE 3-2:
RESISTANCE MEASUREMENT ACCURACY SET BY EXTERNAL
STANDARD RESISTOR
Buffer
TC815
R6/100k
50
32
S19
DE
S20
VCC - 2.6V
1.5kV
VCC
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
Integrator
Comparator
S37
S35
55
54
R
ΩBUF
S12
S13
DE
S18
S21
DE
INT • (
Ω + DC)
33
CREF
0.1µF
R7/100k
31
Analog
Common
29
34
28
10k
57
30
30
VSSA
9V
R18
24k
5k
REFHI
220k
49
0.1µF
150k
RVIBUF
47
CINT
0.1µF
S36
S34
RX
Unknown
R8
220
V •
1
1
R5/1638500
R4/163850
R3/16385
R2/1638.5
R1/163.85
DE +
• LO
CAZ
VCC - 2.8V
VSSD
VCC
~
1.5k
~
DE
50
+
Example: 200k
Ω Full Scale Measurement
VR
163.85k
163.85
220
RX
++
-------------------------------------------------

 x0.64
=
(a )
(b)
VX
RX
163.85k
Ω 220Ω RX
++
--------------------------------------------------------------

 x0.64
=
(c) “Ramp Up Voltage” = “Ramp Down Voltage”
VX
R
ICI
()
----------------xT
I
VX
R
ICI
()
----------------T
DE
=
.
..
Where:
RI = Integrating Resistor, TI = Integrate Time
CI = Integrating Capacitor, TDE = Deintegrate Time
(d)
RX = 163.85
TI
(TDE)
Independent of RI,CI or Internal Voltage Reference
Unknown
RX
220
0.64V for Ohms
0.32V for LO Ohms
To Analog Buffer
VX
VR
CREF
100 k
RS
16.385k
+
VR
VA


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